OOSMOS | API Reference

An active OOSMOS object is an object that has reactive behavior but does not have the complexity to warrant using a full OOSMOS state machine object.
To establish your object as an active object, you must register it with OOSMOS like this: create a subroutine for OOSMOS to call (line 103), then create an oosmos_sActiveObject member in your object (line 39) and then finally call oosmos_ActiveObjectInit (line 61).

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void oosmos_ActiveObjectInit(void * pObject, oosmos_sActiveObject * pActiveObject, oosmos_tActiveObjectFunc pFunc);

Prototype

pObject	Pointer to your active object.
pActiveObject	Pointer to the `oosmos_sActiveObject` object member.
pFunc	Address of the function to call each time through the `OOSMOS` main loop.
See Also	`sActiveObject`

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//	[MIT]
// OOSMOS sw Class
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#ifndef swMaxSwitches	[...]
#define swMaxSwitches 20
#endif

#ifndef swMaxCloseSubscribers
#define swMaxCloseSubscribers 1
#endif

#ifndef swMaxOpenSubscribers
#define swMaxOpenSubscribers 1
#endif

//===================================

#include "oosmos.h"
#include "pin.h"
#include "sw.h"
#include <stdbool.h>
#include <stddef.h>

typedef enum {
Unknown_State = 1,
Open_State,
Closed_State
} eStates;

struct swTag
{
pin * m_pPin;
eStates m_State;

oosmos_sActiveObject m_ActiveObject;
oosmos_sSubscriberList m_CloseEvent[swMaxCloseSubscribers];
oosmos_sSubscriberList m_OpenEvent[swMaxOpenSubscribers];
};

extern sw * swNewDetached(pin * pPin)
{
oosmos_Allocate(pSwitch, sw, swMaxSwitches, NULL);

pSwitch->m_pPin = pPin;
pSwitch->m_State = Unknown_State;

oosmos_SubscriberListInit(pSwitch->m_CloseEvent);
oosmos_SubscriberListInit(pSwitch->m_OpenEvent);

return pSwitch;
}

extern sw * swNew(pin * pPin)
{
sw * pSwitch = swNewDetached(pPin);

oosmos_ActiveObjectInit(pSwitch, m_ActiveObject, swRunStateMachine);

return pSwitch;
}

extern void swSubscribeCloseEvent(sw * pSwitch, oosmos_sQueue * pQueue, int CloseEventCode, void * pContext)	[...]
{
oosmos_POINTER_GUARD(pSwitch);

oosmos_SubscriberListAdd(pSwitch->m_CloseEvent, pQueue, CloseEventCode, pContext);
}

extern void swSubscribeOpenEvent(sw * pSwitch, oosmos_sQueue * pQueue, int OpenEventCode, void * pContext)
{
oosmos_POINTER_GUARD(pSwitch);

oosmos_SubscriberListAdd(pSwitch->m_OpenEvent, pQueue, OpenEventCode, pContext);
}

static eStates PhysicalSwitchState(const sw * pSwitch)
{
oosmos_POINTER_GUARD(pSwitch);

return pinIsOn(pSwitch->m_pPin) ? Closed_State : Open_State;
}

extern bool swIsOpen(const sw * pSwitch)
{
return !swIsClosed(pSwitch);
}

extern bool swIsClosed(const sw * pSwitch)
{
oosmos_POINTER_GUARD(pSwitch);

if (pSwitch->m_State == Unknown_State) {
return PhysicalSwitchState(pSwitch) == Closed_State;
}

return pSwitch->m_State == Closed_State;
}

extern void swRunStateMachine(sw * pSwitch)
{
oosmos_POINTER_GUARD(pSwitch);

switch (pSwitch->m_State) {
case Open_State: {
if (pinIsOn(pSwitch->m_pPin)) {
pSwitch->m_State = Closed_State;
oosmos_SubscriberListNotify(pSwitch->m_CloseEvent);
}

break;
}
case Closed_State: {
if (pinIsOff(pSwitch->m_pPin)) {
pSwitch->m_State = Open_State;
oosmos_SubscriberListNotify(pSwitch->m_OpenEvent);
}

break;
}
case Unknown_State: {
pSwitch->m_State = pinIsOn(pSwitch->m_pPin) ? Closed_State : Open_State;
break;
}
}
}

oosmos/Classes/sw.c

oosmos_Allocate is a macro that returns a pointer to an unused object from a fixed number of statically preallocated objects. The static preallocation is done automatically within the macro. Once allocated, objects cannot be returned to the pool. See the example on line 48.
If you need dynamic memory, use malloc in place of this function and then create a complementary toggleDelete function and then do a free to release it.

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Type * oosmos_Allocate(Pointer, Type, Elements, pOutOfMemory);

Prototype

Pointer	The name of the variable that will hold the pointer to the allocated object. You'll use this to initialize your object's members, including the state machine (if the object has one). You must return this pointer to the caller. (See `toggle.c` line 56 below.)
Type	The data type of the object. (See line 14 of `toggle.h` below.)
Elements	The number of objects to pre-allocate. You can specify a number here, but it would be better to use the macro technique used in lines 8-10 of the `toggle.c` where you specify a default amount that can be overridden on the compilation command line. This is commonly done with most compilers like this: `-D` `toggleMax=10`.
pOutOfMemory	The address of a subroutine to call if all preallocated objects have been exhausted. See type `oosmos_tOutOfMemory` for information about how to implement the called routine. If `NULL`, `oosmos_Allocate` will loop forever when all objects of this type are exhausted.
See Also	`AllocateVisible`

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//	[MIT]
// OOSMOS toggle Class
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#ifndef toggle_h	[...]
#define toggle_h

#include "pin.h"
#include <stdint.h>

typedef struct toggleTag toggle;

extern toggle * toggleNew(pin * pPin, uint32_t TimeOnMS, uint32_t TimeOffMS);

#endif

oosmos/Classes/toggle.h

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//	[MIT]
// OOSMOS toggle Class
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#ifndef toggleMAX
#define toggleMAX 5
#endif

//===================================	[...]

#include "oosmos.h"
#include "pin.h"
#include "toggle.h"
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>

struct toggleTag
{
oosmos_sObjectThread m_ObjectThread;

pin * m_pPin;
uint32_t m_TimeOnMS;
uint32_t m_TimeOffMS;
};

static void ToggleThread(const toggle * pToggle, oosmos_sState * pState)
{
oosmos_POINTER_GUARD(pToggle);
oosmos_POINTER_GUARD(pState);

oosmos_ThreadBegin();
for (;;) {
pinOn(pToggle->m_pPin);
oosmos_ThreadDelayMS(pToggle->m_TimeOnMS);

pinOff(pToggle->m_pPin);
oosmos_ThreadDelayMS(pToggle->m_TimeOffMS);
}
oosmos_ThreadEnd();
}

extern toggle * toggleNew(pin * pPin, uint32_t TimeOnMS, uint32_t TimeOffMS)
{
oosmos_Allocate(pToggle, toggle, toggleMAX, NULL);

oosmos_ObjectThreadInit(pToggle, m_ObjectThread, ToggleThread, true);

pToggle->m_pPin = pPin;
pToggle->m_TimeOnMS = TimeOnMS;
pToggle->m_TimeOffMS = TimeOffMS;

return pToggle;
}

oosmos/Classes/toggle.c

oosmos_AllocateVisible is functionally the same as oosmos_Allocate but allows the user to allocate the array of objects in an outer scope thereby allowing access to that array by other parts of the implementation of the object. (See line 66 of the example below.)

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Type * oosmos_AllocateVisible(Pointer, Type, List, Count, Elements, pOutOfMemory);

Prototype

Pointer	The name of the variable that will hold the pointer to the allocated object. You'll use this to initialize your object's members, including the state machine (if the object has one). You must return this pointer to the caller (see line 73).
Type	The data type of the object. (See line 17 of `Interrupt.c`.)
List	The address of the array of objects you pre-allocated. (See line 29.)
Count	The number of objects that have been returned from `oosmos_AllocateVisible`. (See line 30.)
Elements	The number of objects to pre-allocate.
pOutOfMemory	The address of a subroutine to call if all preallocated objects have been exhausted. See type `oosmos_tOutOfMemory` for information about how to implement the called routine. If `NULL` is specified, `oosmos_AllocateVisible` will loop forever when all objects of this type are exhausted.
See Also	`Allocate`

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//	[MIT]
// OOSMOS - Interrupt structure example on Windows
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#include "oosmos.h"	[...]
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>

//
// Demonstrates structure of how to react to interrupts using OOSMOS.
//

typedef struct uartTag uart;

struct uartTag	struct uartTag {...}
{
oosmos_sActiveObject m_ActiveObject;
oosmos_sQueue m_ReceiveDataQueue;
uint8_t m_UartId;
uint8_t m_ReceiveDataQueueData[10];
};

#define MAX_UARTS 5

static uart UartList[MAX_UARTS];
static unsigned UartCount = 0;

static void ReceiverStateMachine(void * pObject)	static void ReceiverStateMachine(...) {...}
{
uart * pUART = (uart *) pObject;
uint8_t Byte = 0;

//DisableInterrupt(pUART);
const bool PopSuccess = oosmos_QueuePop(&pUART->m_ReceiveDataQueue, &Byte, sizeof(Byte));
//EnableInterrupt(pUART);

if (!PopSuccess) {
return;
}

printf("Received %d\n", Byte);
}
	static void ISR(...) {...}
static void ISR(const int UartId)
{
uart * pUART = UartList;

for (unsigned Count = 0; Count < UartCount; pUART++, Count++) {
if (UartId != pUART->m_UartId) {
continue;
}

const uint8_t Byte = (uint8_t) UartId;
oosmos_QueuePush(&pUART->m_ReceiveDataQueue, &Byte, sizeof(Byte));

return;
}
}

extern uart * uartNew(unsigned UartId)
{
oosmos_AllocateVisible(pUART, uart, UartList, UartCount, MAX_UARTS, NULL);

pUART->m_UartId = (uint8_t) UartId;

oosmos_QueueConstruct(&pUART->m_ReceiveDataQueue, pUART->m_ReceiveDataQueueData, sizeof(pUART->m_ReceiveDataQueueData), sizeof(uint8_t));
oosmos_ActiveObjectInit(pUART, m_ActiveObject, ReceiverStateMachine);

return pUART;
}

extern int main(void)
{	extern int main(void) {...}
(void) uartNew(1);
(void) uartNew(3);
(void) uartNew(7);

// Simulate random interrupts...

ISR(3);
oosmos_RunStateMachines();
ISR(7);
oosmos_RunStateMachines();
ISR(1);
oosmos_RunStateMachines();

return 0;
}

oosmos/Examples/Interrupt/Windows/Interrupt.c

Scales a value from a point within one range to the proportionate point in a different range. This function uses a floating point type to guarantee the most accurate result. If speed is more important than accuracy, use oosmos_AnalogMapFast.
See example on line 21, below.

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double oosmos_AnalogMapAccurate(double Value, double InMin, double InMax, double OutMin, double OutMax);

Prototype

Value	The value to be scaled.
InMin	The low end of the source range.
InMax	The high end of the source range.
OutMin	The low end of the target range.
OutMax	The high end of the target range.
RETURN	Returns the scaled number as a floating point value.
See Also	`AnalogMapFast`

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//	[MIT]
// OOSMOS AnalogMap Example
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#include "oosmos.h"	[...]
#include <stdint.h>
#include <stdio.h>

#define ITERATIONS 25

/lint -e728 Suppress "Not explicitly initialized" /
static int FastDistribution[ITERATIONS+1];
/lint -e728 Suppress "Not explicitly initialized" /
static int AccurateDistribution[ITERATIONS+1];

static void TestAccurate(double Value, double InMin, double InMax, double OutMin, double OutMax)
{
const double Result = oosmos_AnalogMapAccurate(Value, InMin, InMax, OutMin, OutMax);

printf("Value:%f, InMin:%f, InMax:%f, OutMin:%f, OutMax:%f, Result:%f\n", Value, InMin, InMax, OutMin, OutMax, Result);

const long IntResult = (long) (Result + 0.5F);
AccurateDistribution[IntResult]++;
}

static void TestFast(int32_t Value, int32_t InMin, int32_t InMax, int32_t OutMin, int32_t OutMax)	[...]
{
const int32_t Result = oosmos_AnalogMapFast(Value, InMin, InMax, OutMin, OutMax);
printf("Value:%ld, InMin:%ld, InMax:%ld, OutMin:%ld, OutMax:%ld, Result:%ld\n",
(long) Value, (long) InMin, (long) InMax, (long) OutMin, (long) OutMax, (long) Result);

FastDistribution[Result]++;
}

extern int main(void)
{
const uint32_t Min = 1;
const uint32_t Max = 1000;

//
// Test accurate implementation...
//
for (uint32_t I = Min; I <= Max; I++) {
TestAccurate((double) I, (double) Min, (double) Max, 1.0, 25.0);
}

for (uint32_t I = 1; I <= ITERATIONS; I++) {
printf("%d\n", AccurateDistribution[I]);
}

//
// Test fast implementation...
//
for (uint32_t I = Min; I <= Max; I++) {
TestFast(I, Min, Max, 1, 25);
}

for (uint32_t I = 1; I <= ITERATIONS; I++) {
printf("%d\n", FastDistribution[I]);
}

return 0;
}

oosmos/Examples/AnalogMap/Windows/AnalogMap.c

Scales a value from a point within one range to the proportionate point in a different range. This function uses a long integral data type in order to calculate the result quickly. If accuracy is more important than speed, use oosmos_AnalogMapAccurate.
See example on line 31, below.

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int32_t oosmos_AnalogMapFast(int32_t Value, int32_t InMin, int32_t InMax, int32_t OutMin, int32_t OutMax);

Prototype

Value	The value to be scaled.
InMin	The low end of the source range.
InMax	The high end of the source range.
OutMin	The low end of the target range.
OutMax	The high end of the target range.
RETURN	Returns the scaled number as a long integral value.
See Also	`AnalogMapAccurate`

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//	[MIT]
// OOSMOS AnalogMap Example
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#include "oosmos.h"	[...]
#include <stdint.h>
#include <stdio.h>

#define ITERATIONS 25

/lint -e728 Suppress "Not explicitly initialized" /
static int FastDistribution[ITERATIONS+1];
/lint -e728 Suppress "Not explicitly initialized" /
static int AccurateDistribution[ITERATIONS+1];

static void TestAccurate(double Value, double InMin, double InMax, double OutMin, double OutMax)
{
const double Result = oosmos_AnalogMapAccurate(Value, InMin, InMax, OutMin, OutMax);

printf("Value:%f, InMin:%f, InMax:%f, OutMin:%f, OutMax:%f, Result:%f\n", Value, InMin, InMax, OutMin, OutMax, Result);

const long IntResult = (long) (Result + 0.5F);
AccurateDistribution[IntResult]++;
}

static void TestFast(int32_t Value, int32_t InMin, int32_t InMax, int32_t OutMin, int32_t OutMax)
{
const int32_t Result = oosmos_AnalogMapFast(Value, InMin, InMax, OutMin, OutMax);
printf("Value:%ld, InMin:%ld, InMax:%ld, OutMin:%ld, OutMax:%ld, Result:%ld\n",
(long) Value, (long) InMin, (long) InMax, (long) OutMin, (long) OutMax, (long) Result);

FastDistribution[Result]++;
}

extern int main(void)	[...]
{
const uint32_t Min = 1;
const uint32_t Max = 1000;

//
// Test accurate implementation...
//
for (uint32_t I = Min; I <= Max; I++) {
TestAccurate((double) I, (double) Min, (double) Max, 1.0, 25.0);
}

for (uint32_t I = 1; I <= ITERATIONS; I++) {
printf("%d\n", AccurateDistribution[I]);
}

//
// Test fast implementation...
//
for (uint32_t I = Min; I <= Max; I++) {
TestFast(I, Min, Max, 1, 25);
}

for (uint32_t I = 1; I <= ITERATIONS; I++) {
printf("%d\n", FastDistribution[I]);
}

return 0;
}

oosmos/Examples/AnalogMap/Windows/AnalogMap.c

oosmos_ASSERT works just like the standard C assert, but instead of aborting the program (which doesn't mean much on an embedded system), it will loop endlessly.

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//	[MIT]
// OOSMOS reg Class - Linear regression
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#include "reg.h"	[...]
#include "oosmos.h"
#include <stdint.h>
#include <string.h>

#ifndef regMax
#define regMax 1
#endif

struct regTag
{
float m_Intercept;
float m_Slope;

regSample* m_SampleFIFO;
size_t m_SampleCount;
size_t m_MaxSamples;
size_t m_StartIndex;
};

extern reg* regNew(regSample* sampleBuffer, size_t MaxSamples)
{
oosmos_Allocate(pReg, reg, regMax, NULL);

pReg->m_SampleFIFO = sampleBuffer;
pReg->m_MaxSamples = MaxSamples;
pReg->m_SampleCount = 0;
pReg->m_StartIndex = 0;
return pReg;
}

extern void regPushSample(reg* pReg, const float X, const float Y)
{
const size_t InsertIndex = (pReg->m_StartIndex + pReg->m_SampleCount) % pReg->m_MaxSamples;

pReg->m_SampleFIFO[InsertIndex].X = X;
pReg->m_SampleFIFO[InsertIndex].Y = Y;

if (pReg->m_SampleCount < pReg->m_MaxSamples) {
pReg->m_SampleCount++;
}
else {
pReg->m_StartIndex = (pReg->m_StartIndex + 1) % pReg->m_MaxSamples;
}
}

static float MeanOfX(const reg* pReg)
{
float sum = 0.0f;

for (size_t i = 0; i < pReg->m_SampleCount; i++) {
size_t index = (pReg->m_StartIndex + i) % pReg->m_MaxSamples;
sum += pReg->m_SampleFIFO[index].X;
}

return sum / pReg->m_SampleCount;
}

static float MeanOfY(const reg* pReg)
{
float sum = 0.0f;

for (size_t i = 0; i < pReg->m_SampleCount; i++) {
size_t index = (pReg->m_StartIndex + i) % pReg->m_MaxSamples;
sum += pReg->m_SampleFIFO[index].Y;
}

return sum / pReg->m_SampleCount;
}

extern void regCalculateRegression(reg* pReg)
{
const float meanX = MeanOfX(pReg);
const float meanY = MeanOfY(pReg);

float sumXY = 0.0f;
float sumXX = 0.0f;

for (size_t i = 0; i < pReg->m_SampleCount; i++) {
size_t index = (pReg->m_StartIndex + i) % pReg->m_MaxSamples;
const regSample* pSample = &pReg->m_SampleFIFO[index];

const float xiMinusMeanX = pSample->X - meanX;
const float yiMinusMeanY = pSample->Y - meanY;

sumXY += xiMinusMeanX * yiMinusMeanY;
sumXX += xiMinusMeanX * xiMinusMeanX;
}

oosmos_ASSERT(sumXX > 0.0f);

pReg->m_Slope = sumXY / sumXX;
pReg->m_Intercept = meanY - pReg->m_Slope * meanX;
}
	[...]
extern float regPredictY(const reg* pReg, float X)
{
return pReg->m_Slope * X + pReg->m_Intercept;
}

extern float regSlope(const reg* pReg)
{
return pReg->m_Slope;
}

extern size_t regGetSampleCount(const reg* pReg)
{
return pReg->m_SampleCount;
}

extern void regClearSamples(reg* pReg)
{
pReg->m_SampleCount = 0;
}

extern void regIterateSamples(const reg* pReg, void (pCallback)(const size_t SampleNumber, const regSample pSample))
{
for (size_t i = 0; i < pReg->m_SampleCount; i++) {
const size_t index = (pReg->m_StartIndex + i) % pReg->m_MaxSamples;
pCallback(i +1 , &pReg->m_SampleFIFO[index]);
}
}

oosmos/Classes/reg.c

oosmos_ChoiceInit initializes an oosmos_sChoice state. A choice pseudostate branches to one of several target states based on guard conditions that are evaluated when the choice state is entered.

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void oosmos_ChoiceInit(pObject, ChoiceState, ParentState, pCode);

Prototype

pObject	The address of the object that contains the state machine.
ChoiceState	The name of the choice state.
ParentState	The name of the parent state.
pCode	The address of the event code function.
See Also	`CompositeInit`, `LeafInit`, `sChoice`

oosmos_ClockSpeedInMHz tells OOSMOS the speed of the processor as configured externally. This call only applies to the PIC32 architecture.

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void oosmos_ClockSpeedInMHz(uint32_t ClockSpeedMHz);

Prototype

See Also

GetClockSpeedInMHz

oosmos_COMPLETE is one of the six predefined event macros. This event is generated when the final states within all orthogonal regions have been entered. See The User's Guide for more information.

See Also

DEFAULT, ENTER, EXIT, POLL, TIMEOUT

oosmos_CompositeInit initializes an oosmos_sComposite state.
See line 107 of the code snippet below for an example.

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void oosmos_CompositeInit(pObject, CompositeState, ParentState, DefaultState, pCode);

Prototype

pObject	The address of the object that contains the state machine.
CompositeState	The name of the composite state.
ParentState	The name of the parent state.
DefaultState	The name of the default state.
pCode	Pointer to event handler function.

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//	[MIT]
// OOSMOS Final Example
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#include "oosmos.h"	[...]
#include <stdbool.h>
#include <stdio.h>

//<<<EVENTS
//>>>EVENTS

typedef struct testTag test;

struct testTag
{
//>>>DECL
oosmos_sStateMachineNoQueue(ROOT);
oosmos_sComposite A_State;
oosmos_sChoice A_Choice1_State;
oosmos_sLeaf A_Left_State;
oosmos_sLeaf A_Right_State;
oosmos_sFinal A_Final1_State;
oosmos_sLeaf B_State;
//<<<DECL
};

static bool IsLeft(void)
{
return true;
}

static void Default(void)
{
printf("In Default\n");
}

//>>>CODE
static bool A_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_DEFAULT: {
Default();
return true;
}
case oosmos_COMPLETE: {
return oosmos_Transition(pTest, pState, B_State);
}
}

return false;
}

static bool A_Choice1_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

if (oosmos_EventCode(pEvent) == oosmos_ENTER) {
if (IsLeft()) {
return oosmos_Transition(pTest, pState, A_Left_State);
}
else {
return oosmos_Transition(pTest, pState, A_Right_State);
}
}

return false;
}

static bool A_Left_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_COMPLETE: {
return oosmos_Transition(pTest, pState, A_Final1_State);
}
}

return false;
}

static bool A_Right_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_COMPLETE: {
return oosmos_Transition(pTest, pState, A_Final1_State);
}
}

return false;
}
//<<<CODE

static test * testNew(void)
{
oosmos_Allocate(pTest, test, 1, NULL);

//>>>INIT
oosmos_StateMachineInitNoQueue(pTest, ROOT, NULL, A_State);
oosmos_CompositeInit(pTest, A_State, ROOT, A_Choice1_State, A_State_Code);
oosmos_ChoiceInit(pTest, A_Choice1_State, A_State, A_Choice1_State_Code);
oosmos_LeafInit(pTest, A_Left_State, A_State, A_Left_State_Code);
oosmos_LeafInit(pTest, A_Right_State, A_State, A_Right_State_Code);
oosmos_FinalInit(pTest, A_Final1_State, A_State, NULL);
oosmos_LeafInit(pTest, B_State, ROOT, NULL);

oosmos_Debug(pTest, NULL);
//<<<INIT

return pTest;
}

extern int main(void)	[...]
{
test * pTest = testNew();

for (;;) {
oosmos_RunStateMachines();

if (oosmos_IsInState(pTest, &pTest->B_State)) {
printf("SUCCESS.\n");
break;
}

oosmos_DelayMS(1);
}
}

oosmos/Examples/Basic/Windows/Final.c

oosmos_Days2Hours is a macro that converts days to hours.

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oosmos_Days2Hours(Days)

Macro

See Also

Days2MS, Days2Minutes, Days2Seconds, Days2US, Divide_Integral_Rounded, Hours2Days_Rounded, Hours2Days_Truncated, Hours2MS, Hours2Minutes, Hours2Seconds, Hours2US, MS2Days_Rounded, MS2Days_Truncated, MS2Hours_Rounded, MS2Hours_Truncated, MS2Minutes_Rounded, MS2Minutes_Truncated, MS2Seconds_Rounded, MS2Seconds_Truncated, MS2US, Minutes2Days_Rounded, Minutes2Days_Truncated, Minutes2Hours_Rounded, Minutes2Hours_Truncated, Minutes2MS, Minutes2Seconds, Minutes2US, Seconds2Days_Rounded, Seconds2Days_Truncated, Seconds2Hours_Rounded, Seconds2Hours_Truncated, Seconds2MS, Seconds2Minutes_Rounded, Seconds2Minutes_Truncated, Seconds2US, US2Days_Rounded, US2Days_Truncated, US2Hours_Rounded, US2Hours_Truncated, US2MS_Rounded, US2MS_Truncated, US2Minutes_Rounded, US2Minutes_Truncated, US2Seconds_Rounded, US2Seconds_Truncated

oosmos_Days2Minutes is a macro that converts days to minutes.

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oosmos_Days2Minutes(Days)

Macro

See Also

Days2Hours, Days2MS, Days2Seconds, Days2US, Divide_Integral_Rounded, Hours2Days_Rounded, Hours2Days_Truncated, Hours2MS, Hours2Minutes, Hours2Seconds, Hours2US, MS2Days_Rounded, MS2Days_Truncated, MS2Hours_Rounded, MS2Hours_Truncated, MS2Minutes_Rounded, MS2Minutes_Truncated, MS2Seconds_Rounded, MS2Seconds_Truncated, MS2US, Minutes2Days_Rounded, Minutes2Days_Truncated, Minutes2Hours_Rounded, Minutes2Hours_Truncated, Minutes2MS, Minutes2Seconds, Minutes2US, Seconds2Days_Rounded, Seconds2Days_Truncated, Seconds2Hours_Rounded, Seconds2Hours_Truncated, Seconds2MS, Seconds2Minutes_Rounded, Seconds2Minutes_Truncated, Seconds2US, US2Days_Rounded, US2Days_Truncated, US2Hours_Rounded, US2Hours_Truncated, US2MS_Rounded, US2MS_Truncated, US2Minutes_Rounded, US2Minutes_Truncated, US2Seconds_Rounded, US2Seconds_Truncated

oosmos_Days2MS is a macro that converts days to milliseconds.

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oosmos_Days2MS(Days)

Macro

See Also

Days2Hours, Days2Minutes, Days2Seconds, Days2US, Divide_Integral_Rounded, Hours2Days_Rounded, Hours2Days_Truncated, Hours2MS, Hours2Minutes, Hours2Seconds, Hours2US, MS2Days_Rounded, MS2Days_Truncated, MS2Hours_Rounded, MS2Hours_Truncated, MS2Minutes_Rounded, MS2Minutes_Truncated, MS2Seconds_Rounded, MS2Seconds_Truncated, MS2US, Minutes2Days_Rounded, Minutes2Days_Truncated, Minutes2Hours_Rounded, Minutes2Hours_Truncated, Minutes2MS, Minutes2Seconds, Minutes2US, Seconds2Days_Rounded, Seconds2Days_Truncated, Seconds2Hours_Rounded, Seconds2Hours_Truncated, Seconds2MS, Seconds2Minutes_Rounded, Seconds2Minutes_Truncated, Seconds2US, US2Days_Rounded, US2Days_Truncated, US2Hours_Rounded, US2Hours_Truncated, US2MS_Rounded, US2MS_Truncated, US2Minutes_Rounded, US2Minutes_Truncated, US2Seconds_Rounded, US2Seconds_Truncated

oosmos_Days2Seconds is a macro that converts days to seconds.

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oosmos_Days2Seconds(Days)

Macro

See Also

Days2Hours, Days2MS, Days2Minutes, Days2US, Divide_Integral_Rounded, Hours2Days_Rounded, Hours2Days_Truncated, Hours2MS, Hours2Minutes, Hours2Seconds, Hours2US, MS2Days_Rounded, MS2Days_Truncated, MS2Hours_Rounded, MS2Hours_Truncated, MS2Minutes_Rounded, MS2Minutes_Truncated, MS2Seconds_Rounded, MS2Seconds_Truncated, MS2US, Minutes2Days_Rounded, Minutes2Days_Truncated, Minutes2Hours_Rounded, Minutes2Hours_Truncated, Minutes2MS, Minutes2Seconds, Minutes2US, Seconds2Days_Rounded, Seconds2Days_Truncated, Seconds2Hours_Rounded, Seconds2Hours_Truncated, Seconds2MS, Seconds2Minutes_Rounded, Seconds2Minutes_Truncated, Seconds2US, US2Days_Rounded, US2Days_Truncated, US2Hours_Rounded, US2Hours_Truncated, US2MS_Rounded, US2MS_Truncated, US2Minutes_Rounded, US2Minutes_Truncated, US2Seconds_Rounded, US2Seconds_Truncated

oosmos_Days2US is a macro that converts days to microseconds.

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oosmos_Days2US(Days)

Macro

See Also

Days2Hours, Days2MS, Days2Minutes, Days2Seconds, Divide_Integral_Rounded, Hours2Days_Rounded, Hours2Days_Truncated, Hours2MS, Hours2Minutes, Hours2Seconds, Hours2US, MS2Days_Rounded, MS2Days_Truncated, MS2Hours_Rounded, MS2Hours_Truncated, MS2Minutes_Rounded, MS2Minutes_Truncated, MS2Seconds_Rounded, MS2Seconds_Truncated, MS2US, Minutes2Days_Rounded, Minutes2Days_Truncated, Minutes2Hours_Rounded, Minutes2Hours_Truncated, Minutes2MS, Minutes2Seconds, Minutes2US, Seconds2Days_Rounded, Seconds2Days_Truncated, Seconds2Hours_Rounded, Seconds2Hours_Truncated, Seconds2MS, Seconds2Minutes_Rounded, Seconds2Minutes_Truncated, Seconds2US, US2Days_Rounded, US2Days_Truncated, US2Hours_Rounded, US2Hours_Truncated, US2MS_Rounded, US2MS_Truncated, US2Minutes_Rounded, US2Minutes_Truncated, US2Seconds_Rounded, US2Seconds_Truncated

A call to oosmos_Debug is generated by the OOSMOS code generator when the debug option is specified in your .json generator configuration file. oosmos_Debug enables debug output indicating when transitions are made into and out of states and when events occur. See line 153 in the code snippet below for an example.

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oosmos_Debug(pObject, pEventName);

Prototype

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Completion.c: ==> Ortho_State
Completion.c: ==> Ortho_Region2_Idle_State
Completion.c: ==> Ortho_Region1_Idle_State
Completion.c: EVENT: evA (1)
Completion.c: Ortho_Region1_Idle_State -->
Completion.c: --> Ortho_Region1_Moving_State
Completion.c: EVENT: evB (2)
Completion.c: Ortho_Region2_Idle_State -->
Completion.c: --> Ortho_Region2_Moving_State
Completion.c: EVENT: evStop (3)
Completion.c: Ortho_Region2_Moving_State -->
Completion.c: --> Ortho_Region2_Final2_State
Completion.c: Ortho_Region1_Moving_State -->
Completion.c: --> Ortho_Region1_Final1_State
Completion.c: ((( Ortho_State Complete )))
Completion.c: Ortho_Region2_Final2_State -->
Completion.c: Ortho_Region1_Final1_State -->
Completion.c: Ortho_State -->
Completion.c: --> Complete_State

--Goal State Achieved--
SUCCESS

Output from running Completion.exe

pObject	The address of the object that contains the state machine.
pEventName	This argument specifies the address of a function that returns the string representation of an event code.

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//	[MIT]
// OOSMOS Completion Example
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#include "oosmos.h"	[...]
#include <stdbool.h>
#include <stdio.h>

//>>>EVENTS
enum {
evA = 1,
evB = 2,
evStop = 3
};

#ifdef oosmos_DEBUG
static const char * OOSMOS_EventNames(int EventCode)
{
switch (EventCode) {
case evA: return "evA";
case evB: return "evB";
case evStop: return "evStop";
default: return "";
}
}
#endif
//<<<EVENTS

typedef struct testTag test;

typedef union {
oosmos_sEvent Base;
} uEvents;

struct testTag
{
//>>>DECL
oosmos_sStateMachine(ROOT, uEvents, 3);
oosmos_sOrtho Ortho_State;
oosmos_sOrthoRegion Ortho_Region1_State;
oosmos_sLeaf Ortho_Region1_Idle_State;
oosmos_sLeaf Ortho_Region1_Moving_State;
oosmos_sFinal Ortho_Region1_Final1_State;
oosmos_sOrthoRegion Ortho_Region2_State;
oosmos_sLeaf Ortho_Region2_Idle_State;
oosmos_sLeaf Ortho_Region2_Moving_State;
oosmos_sFinal Ortho_Region2_Final2_State;
oosmos_sLeaf Complete_State;
//<<<DECL
};

//>>>CODE
static bool Ortho_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_COMPLETE: {
return oosmos_Transition(pTest, pState, Complete_State);
}
}

return false;
}

static bool Ortho_Region1_Idle_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case evA: {
return oosmos_Transition(pTest, pState, Ortho_Region1_Moving_State);
}
}

return false;
}

static bool Ortho_Region1_Moving_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case evStop: {
return oosmos_Transition(pTest, pState, Ortho_Region1_Final1_State);
}
}

return false;
}

static bool Ortho_Region2_Idle_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case evB: {
return oosmos_Transition(pTest, pState, Ortho_Region2_Moving_State);
}
}

return false;
}

static bool Ortho_Region2_Moving_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case evStop: {
return oosmos_Transition(pTest, pState, Ortho_Region2_Final2_State);
}
}

return false;
}

static bool Complete_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
switch (oosmos_EventCode(pEvent)) {
case oosmos_ENTER: {
printf("\n--Goal State Achieved--\n");
return true;
}
}

oosmos_UNUSED(pObject);
oosmos_UNUSED(pState);
return false;
}
//<<<CODE

static test * testNew(void)
{
oosmos_Allocate(pTest, test, 1, NULL);

//>>>INIT
oosmos_StateMachineInit(pTest, ROOT, NULL, Ortho_State);
oosmos_OrthoInit(pTest, Ortho_State, ROOT, Ortho_State_Code);
oosmos_OrthoRegionInit(pTest, Ortho_Region1_State, Ortho_State, Ortho_Region1_Idle_State, NULL);
oosmos_LeafInit(pTest, Ortho_Region1_Idle_State, Ortho_Region1_State, Ortho_Region1_Idle_State_Code);
oosmos_LeafInit(pTest, Ortho_Region1_Moving_State, Ortho_Region1_State, Ortho_Region1_Moving_State_Code);
oosmos_FinalInit(pTest, Ortho_Region1_Final1_State, Ortho_Region1_State, NULL);
oosmos_OrthoRegionInit(pTest, Ortho_Region2_State, Ortho_State, Ortho_Region2_Idle_State, NULL);
oosmos_LeafInit(pTest, Ortho_Region2_Idle_State, Ortho_Region2_State, Ortho_Region2_Idle_State_Code);
oosmos_LeafInit(pTest, Ortho_Region2_Moving_State, Ortho_Region2_State, Ortho_Region2_Moving_State_Code);
oosmos_FinalInit(pTest, Ortho_Region2_Final2_State, Ortho_Region2_State, NULL);
oosmos_LeafInit(pTest, Complete_State, ROOT, Complete_State_Code);

oosmos_Debug(pTest, OOSMOS_EventNames);
//<<<INIT

return pTest;
}

static void QueueEvent(const test * pTest, int EventCode)	[...]
{
oosmos_PushEventCode(pTest, EventCode);
oosmos_RunStateMachines();
}

extern int main(void)
{
test * pTest = testNew();

QueueEvent(pTest, evA);
QueueEvent(pTest, evB);
QueueEvent(pTest, evStop);

if (oosmos_IsInState(pTest, &pTest->Complete_State)) {
printf("SUCCESS\n");
} else {
printf("FAILURE\n");
}

return 0;
}

oosmos/Examples/Ortho/Windows/Completion.c

oosmos_DebugPrint

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//	[MIT]
// OOSMOS EventDemo example, control object
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#include "control.h"	[...]

#include "motor.h"
#include "oosmos.h"
#include "pin.h"
#include "pump.h"
#include "sw.h"
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>

//>>>EVENTS
enum {
evMovePressed = 1,
evOption1Pressed = 2,
evOption2Pressed = 3,
evPumpPressed = 4,
evQuitPressed = 5,
evStopPressed = 6,
evStopReleased = 7
};

#ifdef oosmos_DEBUG
static const char * OOSMOS_EventNames(int EventCode)
{
switch (EventCode) {
case evMovePressed: return "evMovePressed";
case evOption1Pressed: return "evOption1Pressed";
case evOption2Pressed: return "evOption2Pressed";
case evPumpPressed: return "evPumpPressed";
case evQuitPressed: return "evQuitPressed";
case evStopPressed: return "evStopPressed";
case evStopReleased: return "evStopReleased";
default: return "";
}
}
#endif
//<<<EVENTS

typedef union {
oosmos_sEvent Event;
} uEvents;

struct controlTag
{
motor * m_pMotor;
pump * m_pPump;
bool m_Option1;
bool m_Option2;

//>>>DECL
oosmos_sStateMachine(ROOT, uEvents, 3);
oosmos_sLeaf StartingUp_State;
oosmos_sOrtho Operational_State;
oosmos_sOrthoRegion Operational_Region1_State;
oosmos_sLeaf Operational_Region1_Moving_State;
oosmos_sLeaf Operational_Region1_Idle_State;
oosmos_sOrthoRegion Operational_Region2_State;
oosmos_sLeaf Operational_Region2_Pumping_State;
oosmos_sLeaf Operational_Region2_Idle_State;
oosmos_sLeaf StopPressed_State;
oosmos_sLeaf Terminated_State;
//<<<DECL
};

static void ToggleOption1(control * pControl)
{
pControl->m_Option1 = !(pControl->m_Option1);
oosmos_DebugPrint("Option1: %d\n", pControl->m_Option1);
}

static void ToggleOption2(control * pControl)
{
pControl->m_Option2 = !(pControl->m_Option2);
oosmos_DebugPrint("Option2: %d\n", pControl->m_Option1);
}

//>>>CODE	[...]
static bool StartingUp_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
control * pControl = (control *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_ENTER: {
return oosmos_StateTimeoutSeconds(pState, (uint32_t) 1);
}
case oosmos_TIMEOUT: {
return oosmos_Transition(pControl, pState, Operational_State);
}
}

return false;
}

static bool Operational_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
control * pControl = (control *) pObject;

switch (oosmos_EventCode(pEvent)) {
case evStopPressed: {
return oosmos_Transition(pControl, pState, StopPressed_State);
}
case evQuitPressed: {
return oosmos_Transition(pControl, pState, Terminated_State);
}
}

return false;
}

static bool StopPressed_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
control * pControl = (control *) pObject;

switch (oosmos_EventCode(pEvent)) {
case evOption1Pressed: {
ToggleOption1(pControl);
return true;
}
case evOption2Pressed: {
ToggleOption2(pControl);
return true;
}
case evStopReleased: {
return oosmos_Transition(pControl, pState, Operational_State);
}
}

return false;
}

static bool Operational_Region1_Moving_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
control * pControl = (control *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_ENTER: {
motorOn(pControl->m_pMotor);
return true;
}
case oosmos_EXIT: {
motorOff(pControl->m_pMotor);
return true;
}
case evMovePressed: {
return oosmos_Transition(pControl, pState, Operational_Region1_Idle_State);
}
}

return false;
}

static bool Operational_Region1_Idle_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
control * pControl = (control *) pObject;

switch (oosmos_EventCode(pEvent)) {
case evMovePressed: {
return oosmos_Transition(pControl, pState, Operational_Region1_Moving_State);
}
}

return false;
}

static bool Terminated_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
switch (oosmos_EventCode(pEvent)) {
case oosmos_ENTER: {
exit(1);
}
}

oosmos_UNUSED(pObject);
oosmos_UNUSED(pState);
return false;
}

static bool Operational_Region2_Pumping_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
control * pControl = (control *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_ENTER: {
pumpOn(pControl->m_pPump);
return true;
}
case oosmos_EXIT: {
pumpOff(pControl->m_pPump);
return true;
}
case evPumpPressed: {
return oosmos_Transition(pControl, pState, Operational_Region2_Idle_State);
}
}

return false;
}

static bool Operational_Region2_Idle_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
control * pControl = (control *) pObject;

switch (oosmos_EventCode(pEvent)) {
case evPumpPressed: {
return oosmos_Transition(pControl, pState, Operational_Region2_Pumping_State);
}
}

return false;
}
//<<<CODE

extern control * controlNew(void)
{
oosmos_Allocate(pControl, control, 1, NULL);

oosmos_sQueue * const pControlEventQueue = &pControl->m_EventQueue;

pin * pStopPin = pinNew_Key('s', pinActiveHigh);
sw * pStopSwitch = swNew(pStopPin);
swSubscribeCloseEvent(pStopSwitch, pControlEventQueue, evStopPressed, NULL);
swSubscribeOpenEvent(pStopSwitch, pControlEventQueue, evStopReleased, NULL);

pin * pMovePin = pinNew_Key('m', pinActiveHigh);
sw * pMoveSwitch = swNew(pMovePin);
swSubscribeCloseEvent(pMoveSwitch, pControlEventQueue, evMovePressed, NULL);

pin * pQuitPin = pinNew_Key('q', pinActiveHigh);
sw * pQuitSwitch = swNew(pQuitPin);
swSubscribeCloseEvent(pQuitSwitch, pControlEventQueue, evQuitPressed, NULL);

pin * pPumpPin = pinNew_Key('p', pinActiveHigh);
sw * pPumpSwitch = swNew(pPumpPin);
swSubscribeCloseEvent(pPumpSwitch, pControlEventQueue, evPumpPressed, NULL);

pin * pOption1Pin = pinNew_Key('1', pinActiveHigh);
sw * pOption1Switch = swNew(pOption1Pin);
swSubscribeCloseEvent(pOption1Switch, pControlEventQueue, evOption1Pressed, NULL);

pin * pOption2Pin = pinNew_Key('2', pinActiveHigh);
sw * pOption2Switch = swNew(pOption2Pin);
swSubscribeCloseEvent(pOption2Switch, pControlEventQueue, evOption2Pressed, NULL);

pin * pUpPin = pinNew_Key('u', pinActiveHigh);
sw * pUpSwitch = swNew(pUpPin);

pin * pDownPin = pinNew_Key('d', pinActiveHigh);
sw * pDownSwitch = swNew(pDownPin);

pControl->m_pMotor = motorNew();
pControl->m_pPump = pumpNew(pUpSwitch, pDownSwitch);
pControl->m_Option1 = false;
pControl->m_Option2 = false;

//>>>INIT
oosmos_StateMachineInit(pControl, ROOT, NULL, StartingUp_State);
oosmos_LeafInit(pControl, StartingUp_State, ROOT, StartingUp_State_Code);
oosmos_OrthoInit(pControl, Operational_State, ROOT, Operational_State_Code);
oosmos_OrthoRegionInit(pControl, Operational_Region1_State, Operational_State, Operational_Region1_Idle_State, NULL);
oosmos_LeafInit(pControl, Operational_Region1_Moving_State, Operational_Region1_State, Operational_Region1_Moving_State_Code);
oosmos_LeafInit(pControl, Operational_Region1_Idle_State, Operational_Region1_State, Operational_Region1_Idle_State_Code);
oosmos_OrthoRegionInit(pControl, Operational_Region2_State, Operational_State, Operational_Region2_Idle_State, NULL);
oosmos_LeafInit(pControl, Operational_Region2_Pumping_State, Operational_Region2_State, Operational_Region2_Pumping_State_Code);
oosmos_LeafInit(pControl, Operational_Region2_Idle_State, Operational_Region2_State, Operational_Region2_Idle_State_Code);
oosmos_LeafInit(pControl, StopPressed_State, ROOT, StopPressed_State_Code);
oosmos_LeafInit(pControl, Terminated_State, ROOT, Terminated_State_Code);

oosmos_Debug(pControl, OOSMOS_EventNames);
//<<<INIT

return pControl;
}

oosmos/Examples/EventDemo/Windows/control.c

oosmos_DEFAULT is one of the six predefined event macros. This event is sent to the state once, before the state is entered, to allow the user the opportunity to execute initialization code. See line 46 in the code snippet below for an example.

See Also

COMPLETE, ENTER, EXIT, POLL, TIMEOUT

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//	[MIT]
// OOSMOS Final Example
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#include "oosmos.h"	[...]
#include <stdbool.h>
#include <stdio.h>

//<<<EVENTS
//>>>EVENTS

typedef struct testTag test;

struct testTag
{
//>>>DECL
oosmos_sStateMachineNoQueue(ROOT);
oosmos_sComposite A_State;
oosmos_sChoice A_Choice1_State;
oosmos_sLeaf A_Left_State;
oosmos_sLeaf A_Right_State;
oosmos_sFinal A_Final1_State;
oosmos_sLeaf B_State;
//<<<DECL
};

static bool IsLeft(void)
{
return true;
}

static void Default(void)
{
printf("In Default\n");
}

//>>>CODE
static bool A_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_DEFAULT: {
Default();
return true;
}
case oosmos_COMPLETE: {
return oosmos_Transition(pTest, pState, B_State);
}
}

return false;
}
	[...]
static bool A_Choice1_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

if (oosmos_EventCode(pEvent) == oosmos_ENTER) {
if (IsLeft()) {
return oosmos_Transition(pTest, pState, A_Left_State);
}
else {
return oosmos_Transition(pTest, pState, A_Right_State);
}
}

return false;
}

static bool A_Left_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_COMPLETE: {
return oosmos_Transition(pTest, pState, A_Final1_State);
}
}

return false;
}

static bool A_Right_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_COMPLETE: {
return oosmos_Transition(pTest, pState, A_Final1_State);
}
}

return false;
}
//<<<CODE

static test * testNew(void)
{
oosmos_Allocate(pTest, test, 1, NULL);

//>>>INIT
oosmos_StateMachineInitNoQueue(pTest, ROOT, NULL, A_State);
oosmos_CompositeInit(pTest, A_State, ROOT, A_Choice1_State, A_State_Code);
oosmos_ChoiceInit(pTest, A_Choice1_State, A_State, A_Choice1_State_Code);
oosmos_LeafInit(pTest, A_Left_State, A_State, A_Left_State_Code);
oosmos_LeafInit(pTest, A_Right_State, A_State, A_Right_State_Code);
oosmos_FinalInit(pTest, A_Final1_State, A_State, NULL);
oosmos_LeafInit(pTest, B_State, ROOT, NULL);

oosmos_Debug(pTest, NULL);
//<<<INIT

return pTest;
}

extern int main(void)
{
test * pTest = testNew();

for (;;) {
oosmos_RunStateMachines();

if (oosmos_IsInState(pTest, &pTest->B_State)) {
printf("SUCCESS.\n");
break;
}

oosmos_DelayMS(1);
}
}

oosmos/Examples/Basic/Windows/Final.c

oosmos_DelayMS suspends all processing for a specified number of milliseconds. oosmos_DelayMS is a thread blocker, not an object blocker. If you want to suspend only the current object, use the oosmos_TimeoutInMS or oosmos_ThreadDelayMS (inside of a thread group) instead. See line 14 of the snippet below for an example.

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void oosmos_DelayMS(uint32_t Milliseconds);

Prototype

See Also

DelaySeconds, DelayUS, ThreadDelayMS, ThreadDelaySeconds, ThreadDelayUS, TimeoutInMS, TimeoutInSeconds, TimeoutInUS

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//	[MIT]
// OOSMOS DelayMS Example
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#include "oosmos.h"
#include <stdio.h>

extern int main(void)
{
for (unsigned LoopCount = 1; LoopCount <= 5; LoopCount++) {
oosmos_DelayMS(500);
printf("Work...\n");
}

printf("SUCCESS\n");

return 0;
}

DelayMS.c

oosmos_DelaySeconds suspends all processing for a specified number of seconds. See line 14 of the snippet below for an example.
oosmos_DelaySeconds is a thread blocker, not an object blocker. If you want to suspend only the current object, use the oosmos_TimeoutInSeconds or oosmos_ThreadDelaySeconds inside of a thread group instead.

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void oosmos_DelaySeconds(uint32_t Seconds);

Prototype

See Also

DelayMS, DelayUS, ThreadDelayMS, ThreadDelaySeconds, ThreadDelayUS, TimeoutInMS, TimeoutInSeconds, TimeoutInUS

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//	[MIT]
// OOSMOS DelaySeconds Example
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#include "oosmos.h"
#include <stdio.h>

extern int main(void)
{
for (unsigned LoopCount = 1; LoopCount <= 5; LoopCount++) {
oosmos_DelaySeconds(1);
printf("Work...\n");
}

printf("SUCCESS\n");

return 0;
}

DelaySeconds.c

oosmos_DelayUS suspends all processing for a specified number of microseconds. See line 14 of the snippet below for an example.
If you want to suspend only the current object, use the oosmos_TimeoutInUS instead.
Note that oosmos_DelayUS is not implemented on Windows.

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void oosmos_DelayUS(uint32_t Microseconds);

Prototype

See Also

DelayMS, DelaySeconds, ThreadDelayMS, ThreadDelaySeconds, ThreadDelayUS, TimeoutInMS, TimeoutInSeconds, TimeoutInUS

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//	[MIT]
// OOSMOS DelayUS Example
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#include <stdio.h>
#include "oosmos.h"

extern int main(void)
{
for (unsigned LoopCount = 1; LoopCount <= 5; LoopCount++) {
oosmos_DelayUS(1000 * 1000);
printf("Work...\n");
}

printf("SUCCESS\n");

return 0;
}

DelayUS.c

oosmos_Divide_Integral_Rounded is a macro that is used internally by the time unit conversion APIs, but it is externalized for your use.

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oosmos_Divide_Integral_Rounded(Dividend, Divisor)

Macro

See Also

Days2Hours, Days2MS, Days2Minutes, Days2Seconds, Days2US, Hours2Days_Rounded, Hours2Days_Truncated, Hours2MS, Hours2Minutes, Hours2Seconds, Hours2US, MS2Days_Rounded, MS2Days_Truncated, MS2Hours_Rounded, MS2Hours_Truncated, MS2Minutes_Rounded, MS2Minutes_Truncated, MS2Seconds_Rounded, MS2Seconds_Truncated, MS2US, Minutes2Days_Rounded, Minutes2Days_Truncated, Minutes2Hours_Rounded, Minutes2Hours_Truncated, Minutes2MS, Minutes2Seconds, Minutes2US, Seconds2Days_Rounded, Seconds2Days_Truncated, Seconds2Hours_Rounded, Seconds2Hours_Truncated, Seconds2MS, Seconds2Minutes_Rounded, Seconds2Minutes_Truncated, Seconds2US, US2Days_Rounded, US2Days_Truncated, US2Hours_Rounded, US2Hours_Truncated, US2MS_Rounded, US2MS_Truncated, US2Minutes_Rounded, US2Minutes_Truncated, US2Seconds_Rounded, US2Seconds_Truncated

oosmos_EMPTY_EVENT is a macro that initializes an oosmos_sEvent structure to the empty event: event code oosmos_NOP (0) and a NULL context pointer. Useful for initializing a user-defined event structure whose first member is an oosmos_sEvent.

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oosmos_EMPTY_EVENT

Macro

See Also

NOP, sEvent

oosmos_EndProgram exits the program on platforms where that makes sense, like Windows and Linux. On other platforms, it is implemented as an endless loop, effectively stopping the program.

oosmos_ENTER is one of the six predefined event macros. This event is generated when the state is being entered. See line 38 in the code snippet below for an example.

See Also

COMPLETE, DEFAULT, EXIT, POLL, TIMEOUT

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//	[MIT]
// OOSMOS toggle Class
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#include "oosmos.h"	[...]
#include "toggle.h"
#include "pin.h"
#include <stdbool.h>
#include <stdint.h>
#include <stddef.h>

#ifndef toggleMAX
#define toggleMAX 4
#endif

struct toggleTag
{
//>>>DECL
oosmos_sStateMachineNoQueue(ROOT);
oosmos_sLeaf Off_State;
oosmos_sLeaf On_State;
//<<<DECL

pin * m_pPin;
uint32_t m_TimeOnMS;
uint32_t m_TimeOffMS;
};

//>>>CODE
static bool Off_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
toggle * pToggle = (toggle *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_ENTER: {
return oosmos_StateTimeoutMS(pState, (uint32_t) pToggle->m_TimeOffMS);
}
case oosmos_TIMEOUT: {
return oosmos_Transition(pToggle, pState, On_State);
}
}

return false;
}

static bool On_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)	[...]
{
toggle * pToggle = (toggle *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_ENTER: {
pinOn(pToggle->m_pPin);
return oosmos_StateTimeoutMS(pState, (uint32_t) pToggle->m_TimeOnMS);
}
case oosmos_EXIT: {
pinOff(pToggle->m_pPin);
return true;
}
case oosmos_TIMEOUT: {
return oosmos_Transition(pToggle, pState, Off_State);
}
}

return false;
}
//<<<CODE

extern toggle * toggleNew(pin * pPin, uint32_t TimeOnMS, uint32_t TimeOffMS)
{
oosmos_Allocate(pToggle, toggle, toggleMAX, NULL);

//>>>INIT
oosmos_StateMachineInitNoQueue(pToggle, ROOT, NULL, On_State);
oosmos_LeafInit(pToggle, Off_State, ROOT, Off_State_Code);
oosmos_LeafInit(pToggle, On_State, ROOT, On_State_Code);
//<<<INIT

pToggle->m_pPin = pPin;
pToggle->m_TimeOnMS = TimeOnMS;
pToggle->m_TimeOffMS = TimeOffMS;

return pToggle;
}

oosmos/Classes/toggle_state.c (State machine version)

oosmos_EventCode is a macro that accesses the event code from within an OOSMOS event structure to improve readability of the generated code.
See line 37 for an example.

See Also

GetCurrentEvent, sEvent, sState

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//	[...]
// OOSMOS toggle Class
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#include "oosmos.h"
#include "toggle.h"
#include "pin.h"
#include <stdbool.h>
#include <stdint.h>
#include <stddef.h>

#ifndef toggleMAX
#define toggleMAX 4
#endif

struct toggleTag
{
//>>>DECL
oosmos_sStateMachineNoQueue(ROOT);
oosmos_sLeaf Off_State;
oosmos_sLeaf On_State;
//<<<DECL

pin * m_pPin;
uint32_t m_TimeOnMS;
uint32_t m_TimeOffMS;
};

//>>>CODE
static bool Off_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
toggle * pToggle = (toggle *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_ENTER: {
return oosmos_StateTimeoutMS(pState, (uint32_t) pToggle->m_TimeOffMS);
}
case oosmos_TIMEOUT: {
return oosmos_Transition(pToggle, pState, On_State);
}
}

return false;
}
	[...]
static bool On_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
toggle * pToggle = (toggle *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_ENTER: {
pinOn(pToggle->m_pPin);
return oosmos_StateTimeoutMS(pState, (uint32_t) pToggle->m_TimeOnMS);
}
case oosmos_EXIT: {
pinOff(pToggle->m_pPin);
return true;
}
case oosmos_TIMEOUT: {
return oosmos_Transition(pToggle, pState, Off_State);
}
}

return false;
}
//<<<CODE

extern toggle * toggleNew(pin * pPin, uint32_t TimeOnMS, uint32_t TimeOffMS)
{
oosmos_Allocate(pToggle, toggle, toggleMAX, NULL);

//>>>INIT
oosmos_StateMachineInitNoQueue(pToggle, ROOT, NULL, On_State);
oosmos_LeafInit(pToggle, Off_State, ROOT, Off_State_Code);
oosmos_LeafInit(pToggle, On_State, ROOT, On_State_Code);
//<<<INIT

pToggle->m_pPin = pPin;
pToggle->m_TimeOnMS = TimeOnMS;
pToggle->m_TimeOffMS = TimeOffMS;

return pToggle;
}

oosmos/Classes/toggle_state.c (State machine version)

oosmos_EventQueue is a macro that returns the address of the object's event queue. Useful when subscribing the object to events published by another object.

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oosmos_sQueue * oosmos_EventQueue(pObject);

Macro

pObject	The address of the object that contains the event queue.
RETURN	The address of the object's `oosmos_sQueue` event queue.
See Also	`SubscriberListAdd`, `sQueue`, `sStateMachine`

oosmos_EXIT is one of the six predefined event macros. This event is generated when the state is being exited as part of a transition to another state. See line 58 in the code snippet below for an example.

See Also

COMPLETE, DEFAULT, ENTER, POLL, TIMEOUT

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//	[MIT]
// OOSMOS toggle Class
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#include "oosmos.h"	[...]
#include "toggle.h"
#include "pin.h"
#include <stdbool.h>
#include <stdint.h>
#include <stddef.h>

#ifndef toggleMAX
#define toggleMAX 4
#endif

struct toggleTag
{
//>>>DECL
oosmos_sStateMachineNoQueue(ROOT);
oosmos_sLeaf Off_State;
oosmos_sLeaf On_State;
//<<<DECL

pin * m_pPin;
uint32_t m_TimeOnMS;
uint32_t m_TimeOffMS;
};

//>>>CODE
static bool Off_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
toggle * pToggle = (toggle *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_ENTER: {
return oosmos_StateTimeoutMS(pState, (uint32_t) pToggle->m_TimeOffMS);
}
case oosmos_TIMEOUT: {
return oosmos_Transition(pToggle, pState, On_State);
}
}

return false;
}

static bool On_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
toggle * pToggle = (toggle *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_ENTER: {
pinOn(pToggle->m_pPin);
return oosmos_StateTimeoutMS(pState, (uint32_t) pToggle->m_TimeOnMS);
}
case oosmos_EXIT: {
pinOff(pToggle->m_pPin);
return true;
}
case oosmos_TIMEOUT: {
return oosmos_Transition(pToggle, pState, Off_State);
}
}

return false;
}
//<<<CODE	[...]

extern toggle * toggleNew(pin * pPin, uint32_t TimeOnMS, uint32_t TimeOffMS)
{
oosmos_Allocate(pToggle, toggle, toggleMAX, NULL);

//>>>INIT
oosmos_StateMachineInitNoQueue(pToggle, ROOT, NULL, On_State);
oosmos_LeafInit(pToggle, Off_State, ROOT, Off_State_Code);
oosmos_LeafInit(pToggle, On_State, ROOT, On_State_Code);
//<<<INIT

pToggle->m_pPin = pPin;
pToggle->m_TimeOnMS = TimeOnMS;
pToggle->m_TimeOffMS = TimeOffMS;

return pToggle;
}

oosmos/Classes/toggle_state.c (State machine version)

Initializes a Final state. See line 111 for an example.

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void oosmos_FinalInit(pObject, StateName, Parent, pCode);

Prototype

pObject	Pointer to the object that holds the state machine.
StateName	State name of the `Final` element.
Parent	The name of this state's parent state.
pCode	Pointer to event handler function. NULL if there is no function to call.

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//	[MIT]
// OOSMOS Final Example
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#include "oosmos.h"	[...]
#include <stdbool.h>
#include <stdio.h>

//<<<EVENTS
//>>>EVENTS

typedef struct testTag test;

struct testTag
{
//>>>DECL
oosmos_sStateMachineNoQueue(ROOT);
oosmos_sComposite A_State;
oosmos_sChoice A_Choice1_State;
oosmos_sLeaf A_Left_State;
oosmos_sLeaf A_Right_State;
oosmos_sFinal A_Final1_State;
oosmos_sLeaf B_State;
//<<<DECL
};

static bool IsLeft(void)
{
return true;
}

static void Default(void)
{
printf("In Default\n");
}

//>>>CODE
static bool A_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_DEFAULT: {
Default();
return true;
}
case oosmos_COMPLETE: {
return oosmos_Transition(pTest, pState, B_State);
}
}

return false;
}

static bool A_Choice1_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

if (oosmos_EventCode(pEvent) == oosmos_ENTER) {
if (IsLeft()) {
return oosmos_Transition(pTest, pState, A_Left_State);
}
else {
return oosmos_Transition(pTest, pState, A_Right_State);
}
}

return false;
}

static bool A_Left_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_COMPLETE: {
return oosmos_Transition(pTest, pState, A_Final1_State);
}
}

return false;
}

static bool A_Right_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_COMPLETE: {
return oosmos_Transition(pTest, pState, A_Final1_State);
}
}

return false;
}
//<<<CODE

static test * testNew(void)
{
oosmos_Allocate(pTest, test, 1, NULL);

//>>>INIT
oosmos_StateMachineInitNoQueue(pTest, ROOT, NULL, A_State);
oosmos_CompositeInit(pTest, A_State, ROOT, A_Choice1_State, A_State_Code);
oosmos_ChoiceInit(pTest, A_Choice1_State, A_State, A_Choice1_State_Code);
oosmos_LeafInit(pTest, A_Left_State, A_State, A_Left_State_Code);
oosmos_LeafInit(pTest, A_Right_State, A_State, A_Right_State_Code);
oosmos_FinalInit(pTest, A_Final1_State, A_State, NULL);
oosmos_LeafInit(pTest, B_State, ROOT, NULL);

oosmos_Debug(pTest, NULL);
//<<<INIT

return pTest;
}

extern int main(void)	[...]
{
test * pTest = testNew();

for (;;) {
oosmos_RunStateMachines();

if (oosmos_IsInState(pTest, &pTest->B_State)) {
printf("SUCCESS.\n");
break;
}

oosmos_DelayMS(1);
}
}

oosmos/Examples/Basic/Windows/Final.c

oosmos_FOREVER loops forever. Useful to stop a program once a problem has been programmatically identified.

See Also

POINTER_GUARD, UNUSED

oosmos_GetClockSpeedInMHz returns the processor speed previously established with oosmos_ClockSpeedInMHz. This call only applies to the PIC32 architecture.

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uint32_t oosmos_GetClockSpeedInMHz(void);

Prototype

See Also

ClockSpeedInMHz

oosmos_GetCurrentEvent is a macro that returns the address of the event that is currently being delivered to the state machine. Useful for accessing the members of a complex (user-defined) event, for example after an oosmos_ThreadWaitEvent call.

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const oosmos_sEvent * oosmos_GetCurrentEvent(pState);

Macro

pState	The same `pState` argument that was passed into the containing state handler.
RETURN	The address of the event currently being delivered.
See Also	`EventCode`, `ThreadWaitEvent`, `ThreadWaitEvent_TimeoutMS`, `sEvent`

oosmos_GetFreeRunningUS returns the number of microseconds since program start. Returning a uint32_t, the maximum number of microseconds that can be represented is 4,294,967,295, which is a little over 1 hour. Therefore, this value will wrap around to 0 about once an hour. The OOSMOS timeout capabilities handle the wraparound correctly, as does the accum class.

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uint32_t oosmos_GetFreeRunningUS(void)

Prototype

See Also

Days2Hours, Days2MS, Days2Minutes, Days2Seconds, Days2US, Divide_Integral_Rounded, Hours2Days_Rounded, Hours2Days_Truncated, Hours2MS, Hours2Minutes, Hours2Seconds, Hours2US, MS2Days_Rounded, MS2Days_Truncated, MS2Hours_Rounded, MS2Hours_Truncated, MS2Minutes_Rounded, MS2Minutes_Truncated, MS2Seconds_Rounded, MS2Seconds_Truncated, MS2US, Minutes2Days_Rounded, Minutes2Days_Truncated, Minutes2Hours_Rounded, Minutes2Hours_Truncated, Minutes2MS, Minutes2Seconds, Minutes2US, Seconds2Days_Rounded, Seconds2Days_Truncated, Seconds2Hours_Rounded, Seconds2Hours_Truncated, Seconds2MS, Seconds2Minutes_Rounded, Seconds2Minutes_Truncated, Seconds2US, US2Days_Rounded, US2Days_Truncated, US2Hours_Rounded, US2Hours_Truncated, US2MS_Rounded, US2MS_Truncated, US2Minutes_Rounded, US2Minutes_Truncated, US2Seconds_Rounded, US2Seconds_Truncated

oosmos_HexDump prints a hex dump of a memory area using oosmos_DebugPrint. Only available when oosmos_DEBUG is defined.

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void oosmos_HexDump(const void * pBuffer, size_t TotalBytes);

Prototype

pBuffer	The address of the memory area to dump.
TotalBytes	The number of bytes to dump.
See Also	`Debug`, `DebugPrint`

oosmos_HistoryInit initializes an oosmos_sHistory state. When the parent composite state is exited, the history pseudostate remembers which substate was active; a later transition to the history pseudostate resumes at that remembered substate. Shallow history remembers only the immediate substate, while deep history remembers the full nested state configuration.

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void oosmos_HistoryInit(pObject, HistoryState, ParentState, Type);

Prototype

pObject	The address of the object that contains the state machine.
HistoryState	The name of the history state.
ParentState	The name of the parent state.
Type	The kind of history to track: `OOSMOS_HistoryShallowType` or `OOSMOS_HistoryDeepType`.
See Also	`CompositeInit`, `sHistory`

oosmos_Hours2Days_Rounded is a macro that converts hours to days with the result being rounded for better precision. If speed is more important than accuracy, see the truncated version of this macro.

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oosmos_Hours2Days_Rounded(Hours)

Macro

See Also

Days2Hours, Days2MS, Days2Minutes, Days2Seconds, Days2US, Divide_Integral_Rounded, Hours2Days_Truncated, Hours2MS, Hours2Minutes, Hours2Seconds, Hours2US, MS2Days_Rounded, MS2Days_Truncated, MS2Hours_Rounded, MS2Hours_Truncated, MS2Minutes_Rounded, MS2Minutes_Truncated, MS2Seconds_Rounded, MS2Seconds_Truncated, MS2US, Minutes2Days_Rounded, Minutes2Days_Truncated, Minutes2Hours_Rounded, Minutes2Hours_Truncated, Minutes2MS, Minutes2Seconds, Minutes2US, Seconds2Days_Rounded, Seconds2Days_Truncated, Seconds2Hours_Rounded, Seconds2Hours_Truncated, Seconds2MS, Seconds2Minutes_Rounded, Seconds2Minutes_Truncated, Seconds2US, US2Days_Rounded, US2Days_Truncated, US2Hours_Rounded, US2Hours_Truncated, US2MS_Rounded, US2MS_Truncated, US2Minutes_Rounded, US2Minutes_Truncated, US2Seconds_Rounded, US2Seconds_Truncated

oosmos_Hours2Days_Truncated is a macro that converts hours to days with the result being truncated due to default integral division behavior. If precision is important, see the rounded version of this macro.

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oosmos_Hours2Days_Truncated(Hours)

Macro

See Also

Days2Hours, Days2MS, Days2Minutes, Days2Seconds, Days2US, Divide_Integral_Rounded, Hours2Days_Rounded, Hours2MS, Hours2Minutes, Hours2Seconds, Hours2US, MS2Days_Rounded, MS2Days_Truncated, MS2Hours_Rounded, MS2Hours_Truncated, MS2Minutes_Rounded, MS2Minutes_Truncated, MS2Seconds_Rounded, MS2Seconds_Truncated, MS2US, Minutes2Days_Rounded, Minutes2Days_Truncated, Minutes2Hours_Rounded, Minutes2Hours_Truncated, Minutes2MS, Minutes2Seconds, Minutes2US, Seconds2Days_Rounded, Seconds2Days_Truncated, Seconds2Hours_Rounded, Seconds2Hours_Truncated, Seconds2MS, Seconds2Minutes_Rounded, Seconds2Minutes_Truncated, Seconds2US, US2Days_Rounded, US2Days_Truncated, US2Hours_Rounded, US2Hours_Truncated, US2MS_Rounded, US2MS_Truncated, US2Minutes_Rounded, US2Minutes_Truncated, US2Seconds_Rounded, US2Seconds_Truncated

oosmos_Hours2Minutes is a macro that converts hours to minutes.

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oosmos_Hours2Minutes(Hours)

Macro

See Also

Days2Hours, Days2MS, Days2Minutes, Days2Seconds, Days2US, Divide_Integral_Rounded, Hours2Days_Rounded, Hours2Days_Truncated, Hours2MS, Hours2Seconds, Hours2US, MS2Days_Rounded, MS2Days_Truncated, MS2Hours_Rounded, MS2Hours_Truncated, MS2Minutes_Rounded, MS2Minutes_Truncated, MS2Seconds_Rounded, MS2Seconds_Truncated, MS2US, Minutes2Days_Rounded, Minutes2Days_Truncated, Minutes2Hours_Rounded, Minutes2Hours_Truncated, Minutes2MS, Minutes2Seconds, Minutes2US, Seconds2Days_Rounded, Seconds2Days_Truncated, Seconds2Hours_Rounded, Seconds2Hours_Truncated, Seconds2MS, Seconds2Minutes_Rounded, Seconds2Minutes_Truncated, Seconds2US, US2Days_Rounded, US2Days_Truncated, US2Hours_Rounded, US2Hours_Truncated, US2MS_Rounded, US2MS_Truncated, US2Minutes_Rounded, US2Minutes_Truncated, US2Seconds_Rounded, US2Seconds_Truncated

oosmos_Hours2MS is a macro that converts hours to milliseconds.

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oosmos_Hours2MS(Hours)

Macro

See Also

Days2Hours, Days2MS, Days2Minutes, Days2Seconds, Days2US, Divide_Integral_Rounded, Hours2Days_Rounded, Hours2Days_Truncated, Hours2Minutes, Hours2Seconds, Hours2US, MS2Days_Rounded, MS2Days_Truncated, MS2Hours_Rounded, MS2Hours_Truncated, MS2Minutes_Rounded, MS2Minutes_Truncated, MS2Seconds_Rounded, MS2Seconds_Truncated, MS2US, Minutes2Days_Rounded, Minutes2Days_Truncated, Minutes2Hours_Rounded, Minutes2Hours_Truncated, Minutes2MS, Minutes2Seconds, Minutes2US, Seconds2Days_Rounded, Seconds2Days_Truncated, Seconds2Hours_Rounded, Seconds2Hours_Truncated, Seconds2MS, Seconds2Minutes_Rounded, Seconds2Minutes_Truncated, Seconds2US, US2Days_Rounded, US2Days_Truncated, US2Hours_Rounded, US2Hours_Truncated, US2MS_Rounded, US2MS_Truncated, US2Minutes_Rounded, US2Minutes_Truncated, US2Seconds_Rounded, US2Seconds_Truncated

oosmos_Hours2Seconds is a macro that converts hours to seconds.

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oosmos_Hours2Seconds(Hours)

Macro

See Also

Days2Hours, Days2MS, Days2Minutes, Days2Seconds, Days2US, Divide_Integral_Rounded, Hours2Days_Rounded, Hours2Days_Truncated, Hours2MS, Hours2Minutes, Hours2US, MS2Days_Rounded, MS2Days_Truncated, MS2Hours_Rounded, MS2Hours_Truncated, MS2Minutes_Rounded, MS2Minutes_Truncated, MS2Seconds_Rounded, MS2Seconds_Truncated, MS2US, Minutes2Days_Rounded, Minutes2Days_Truncated, Minutes2Hours_Rounded, Minutes2Hours_Truncated, Minutes2MS, Minutes2Seconds, Minutes2US, Seconds2Days_Rounded, Seconds2Days_Truncated, Seconds2Hours_Rounded, Seconds2Hours_Truncated, Seconds2MS, Seconds2Minutes_Rounded, Seconds2Minutes_Truncated, Seconds2US, US2Days_Rounded, US2Days_Truncated, US2Hours_Rounded, US2Hours_Truncated, US2MS_Rounded, US2MS_Truncated, US2Minutes_Rounded, US2Minutes_Truncated, US2Seconds_Rounded, US2Seconds_Truncated

oosmos_Hours2US is a macro that converts hours to microseconds.

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oosmos_Hours2US(Hours)

Macro

See Also

Days2Hours, Days2MS, Days2Minutes, Days2Seconds, Days2US, Divide_Integral_Rounded, Hours2Days_Rounded, Hours2Days_Truncated, Hours2MS, Hours2Minutes, Hours2Seconds, MS2Days_Rounded, MS2Days_Truncated, MS2Hours_Rounded, MS2Hours_Truncated, MS2Minutes_Rounded, MS2Minutes_Truncated, MS2Seconds_Rounded, MS2Seconds_Truncated, MS2US, Minutes2Days_Rounded, Minutes2Days_Truncated, Minutes2Hours_Rounded, Minutes2Hours_Truncated, Minutes2MS, Minutes2Seconds, Minutes2US, Seconds2Days_Rounded, Seconds2Days_Truncated, Seconds2Hours_Rounded, Seconds2Hours_Truncated, Seconds2MS, Seconds2Minutes_Rounded, Seconds2Minutes_Truncated, Seconds2US, US2Days_Rounded, US2Days_Truncated, US2Hours_Rounded, US2Hours_Truncated, US2MS_Rounded, US2MS_Truncated, US2Minutes_Rounded, US2Minutes_Truncated, US2Seconds_Rounded, US2Seconds_Truncated

oosmos_IsInState returns true if the object is in state pState or any of its substates, false otherwise. See line 127 of the code snippet below for an example.

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bool oosmos_IsInState(pObject, pState);

Prototype

pObject	The address of the object that contains the state machine.
pState	The address of the state within the current object.
RETURN	Returns `true` if the object is in the state specified by `pState` or any of its subordinate states, `false` otherwise.

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//	[MIT]
// OOSMOS Final Example
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#include "oosmos.h"	[...]
#include <stdbool.h>
#include <stdio.h>

//<<<EVENTS
//>>>EVENTS

typedef struct testTag test;

struct testTag
{
//>>>DECL
oosmos_sStateMachineNoQueue(ROOT);
oosmos_sComposite A_State;
oosmos_sChoice A_Choice1_State;
oosmos_sLeaf A_Left_State;
oosmos_sLeaf A_Right_State;
oosmos_sFinal A_Final1_State;
oosmos_sLeaf B_State;
//<<<DECL
};

static bool IsLeft(void)
{
return true;
}

static void Default(void)
{
printf("In Default\n");
}

//>>>CODE
static bool A_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_DEFAULT: {
Default();
return true;
}
case oosmos_COMPLETE: {
return oosmos_Transition(pTest, pState, B_State);
}
}

return false;
}

static bool A_Choice1_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

if (oosmos_EventCode(pEvent) == oosmos_ENTER) {
if (IsLeft()) {
return oosmos_Transition(pTest, pState, A_Left_State);
}
else {
return oosmos_Transition(pTest, pState, A_Right_State);
}
}

return false;
}

static bool A_Left_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_COMPLETE: {
return oosmos_Transition(pTest, pState, A_Final1_State);
}
}

return false;
}

static bool A_Right_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_COMPLETE: {
return oosmos_Transition(pTest, pState, A_Final1_State);
}
}

return false;
}
//<<<CODE

static test * testNew(void)
{
oosmos_Allocate(pTest, test, 1, NULL);

//>>>INIT
oosmos_StateMachineInitNoQueue(pTest, ROOT, NULL, A_State);
oosmos_CompositeInit(pTest, A_State, ROOT, A_Choice1_State, A_State_Code);
oosmos_ChoiceInit(pTest, A_Choice1_State, A_State, A_Choice1_State_Code);
oosmos_LeafInit(pTest, A_Left_State, A_State, A_Left_State_Code);
oosmos_LeafInit(pTest, A_Right_State, A_State, A_Right_State_Code);
oosmos_FinalInit(pTest, A_Final1_State, A_State, NULL);
oosmos_LeafInit(pTest, B_State, ROOT, NULL);

oosmos_Debug(pTest, NULL);
//<<<INIT

return pTest;
}

extern int main(void)
{
test * pTest = testNew();

for (;;) {
oosmos_RunStateMachines();

if (oosmos_IsInState(pTest, &pTest->B_State)) {
printf("SUCCESS.\n");
break;
}

oosmos_DelayMS(1);
}
}

oosmos/Examples/Basic/Windows/Final.c

oosmos_LeafInit initializes an oosmos_sLeaf state.
See line 77 in the code snippet below for an example.

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void oosmos_LeafInit(pObject, LeafState, ParentState, pCode);

Prototype

pObject	The address of the object that contains the state machine.
LeafState	The name of the leaf state.
ParentState	The name of the parent state.
pCode	The address of the event code function or NULL.

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//	[MIT]
// OOSMOS toggle Class
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#include "oosmos.h"	[...]
#include "toggle.h"
#include "pin.h"
#include <stdbool.h>
#include <stdint.h>
#include <stddef.h>

#ifndef toggleMAX
#define toggleMAX 4
#endif

struct toggleTag
{
//>>>DECL
oosmos_sStateMachineNoQueue(ROOT);
oosmos_sLeaf Off_State;
oosmos_sLeaf On_State;
//<<<DECL

pin * m_pPin;
uint32_t m_TimeOnMS;
uint32_t m_TimeOffMS;
};

//>>>CODE
static bool Off_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
toggle * pToggle = (toggle *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_ENTER: {
return oosmos_StateTimeoutMS(pState, (uint32_t) pToggle->m_TimeOffMS);
}
case oosmos_TIMEOUT: {
return oosmos_Transition(pToggle, pState, On_State);
}
}

return false;
}

static bool On_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
toggle * pToggle = (toggle *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_ENTER: {
pinOn(pToggle->m_pPin);
return oosmos_StateTimeoutMS(pState, (uint32_t) pToggle->m_TimeOnMS);
}
case oosmos_EXIT: {
pinOff(pToggle->m_pPin);
return true;
}
case oosmos_TIMEOUT: {
return oosmos_Transition(pToggle, pState, Off_State);
}
}

return false;
}
//<<<CODE

extern toggle * toggleNew(pin * pPin, uint32_t TimeOnMS, uint32_t TimeOffMS)
{
oosmos_Allocate(pToggle, toggle, toggleMAX, NULL);

//>>>INIT
oosmos_StateMachineInitNoQueue(pToggle, ROOT, NULL, On_State);
oosmos_LeafInit(pToggle, Off_State, ROOT, Off_State_Code);
oosmos_LeafInit(pToggle, On_State, ROOT, On_State_Code);
//<<<INIT

pToggle->m_pPin = pPin;
pToggle->m_TimeOnMS = TimeOnMS;
pToggle->m_TimeOffMS = TimeOffMS;

return pToggle;
}

oosmos/Classes/toggle_state.c

oosmos_Max is a macro that returns the larger of two values.

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oosmos_Max(a, b)

Macro

See Also

Min

oosmos_Min is a macro that returns the smaller of two values.

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oosmos_Min(a, b)

Macro

See Also

Max

oosmos_Minutes2Days_Rounded is a macro that converts minutes to days with the result being rounded for better precision. If speed is more important than accuracy, see the truncated version of this macro.

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oosmos_Minutes2Days_Rounded(Minutes)

Macro

See Also

Days2Hours, Days2MS, Days2Minutes, Days2Seconds, Days2US, Divide_Integral_Rounded, Hours2Days_Rounded, Hours2Days_Truncated, Hours2MS, Hours2Minutes, Hours2Seconds, Hours2US, MS2Days_Rounded, MS2Days_Truncated, MS2Hours_Rounded, MS2Hours_Truncated, MS2Minutes_Rounded, MS2Minutes_Truncated, MS2Seconds_Rounded, MS2Seconds_Truncated, MS2US, Minutes2Days_Truncated, Minutes2Hours_Rounded, Minutes2Hours_Truncated, Minutes2MS, Minutes2Seconds, Minutes2US, Seconds2Days_Rounded, Seconds2Days_Truncated, Seconds2Hours_Rounded, Seconds2Hours_Truncated, Seconds2MS, Seconds2Minutes_Rounded, Seconds2Minutes_Truncated, Seconds2US, US2Days_Rounded, US2Days_Truncated, US2Hours_Rounded, US2Hours_Truncated, US2MS_Rounded, US2MS_Truncated, US2Minutes_Rounded, US2Minutes_Truncated, US2Seconds_Rounded, US2Seconds_Truncated

oosmos_Minutes2Days_Truncated is a macro that converts minutes to days with the result being truncated due to default integral division behavior. If precision is important, see the rounded version of this macro.

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oosmos_Minutes2Days_Truncated(Minutes)

Macro

See Also

Days2Hours, Days2MS, Days2Minutes, Days2Seconds, Days2US, Divide_Integral_Rounded, Hours2Days_Rounded, Hours2Days_Truncated, Hours2MS, Hours2Minutes, Hours2Seconds, Hours2US, MS2Days_Rounded, MS2Days_Truncated, MS2Hours_Rounded, MS2Hours_Truncated, MS2Minutes_Rounded, MS2Minutes_Truncated, MS2Seconds_Rounded, MS2Seconds_Truncated, MS2US, Minutes2Days_Rounded, Minutes2Hours_Rounded, Minutes2Hours_Truncated, Minutes2MS, Minutes2Seconds, Minutes2US, Seconds2Days_Rounded, Seconds2Days_Truncated, Seconds2Hours_Rounded, Seconds2Hours_Truncated, Seconds2MS, Seconds2Minutes_Rounded, Seconds2Minutes_Truncated, Seconds2US, US2Days_Rounded, US2Days_Truncated, US2Hours_Rounded, US2Hours_Truncated, US2MS_Rounded, US2MS_Truncated, US2Minutes_Rounded, US2Minutes_Truncated, US2Seconds_Rounded, US2Seconds_Truncated

oosmos_Minutes2Hours_Rounded is a macro that converts minutes to hours with the result being rounded for better precision. If speed is more important than accuracy, see the truncated version of this macro.

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oosmos_Minutes2Hours_Rounded(Minutes)

Macro

See Also

Days2Hours, Days2MS, Days2Minutes, Days2Seconds, Days2US, Divide_Integral_Rounded, Hours2Days_Rounded, Hours2Days_Truncated, Hours2MS, Hours2Minutes, Hours2Seconds, Hours2US, MS2Days_Rounded, MS2Days_Truncated, MS2Hours_Rounded, MS2Hours_Truncated, MS2Minutes_Rounded, MS2Minutes_Truncated, MS2Seconds_Rounded, MS2Seconds_Truncated, MS2US, Minutes2Days_Rounded, Minutes2Days_Truncated, Minutes2Hours_Truncated, Minutes2MS, Minutes2Seconds, Minutes2US, Seconds2Days_Rounded, Seconds2Days_Truncated, Seconds2Hours_Rounded, Seconds2Hours_Truncated, Seconds2MS, Seconds2Minutes_Rounded, Seconds2Minutes_Truncated, Seconds2US, US2Days_Rounded, US2Days_Truncated, US2Hours_Rounded, US2Hours_Truncated, US2MS_Rounded, US2MS_Truncated, US2Minutes_Rounded, US2Minutes_Truncated, US2Seconds_Rounded, US2Seconds_Truncated

oosmos_Minutes2Hours_Truncated is a macro that converts minutes to hours with the result being truncated due to default integral division behavior. If precision is important, see the rounded version of this macro.

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oosmos_Minutes2Hours_Truncated(Minutes)

Macro

See Also

Days2Hours, Days2MS, Days2Minutes, Days2Seconds, Days2US, Divide_Integral_Rounded, Hours2Days_Rounded, Hours2Days_Truncated, Hours2MS, Hours2Minutes, Hours2Seconds, Hours2US, MS2Days_Rounded, MS2Days_Truncated, MS2Hours_Rounded, MS2Hours_Truncated, MS2Minutes_Rounded, MS2Minutes_Truncated, MS2Seconds_Rounded, MS2Seconds_Truncated, MS2US, Minutes2Days_Rounded, Minutes2Days_Truncated, Minutes2Hours_Rounded, Minutes2MS, Minutes2Seconds, Minutes2US, Seconds2Days_Rounded, Seconds2Days_Truncated, Seconds2Hours_Rounded, Seconds2Hours_Truncated, Seconds2MS, Seconds2Minutes_Rounded, Seconds2Minutes_Truncated, Seconds2US, US2Days_Rounded, US2Days_Truncated, US2Hours_Rounded, US2Hours_Truncated, US2MS_Rounded, US2MS_Truncated, US2Minutes_Rounded, US2Minutes_Truncated, US2Seconds_Rounded, US2Seconds_Truncated

oosmos_Minutes2MS is a macro that converts minutes to milliseconds.

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oosmos_Minutes2MS(Minutes)

Macro

See Also

Days2Hours, Days2MS, Days2Minutes, Days2Seconds, Days2US, Divide_Integral_Rounded, Hours2Days_Rounded, Hours2Days_Truncated, Hours2MS, Hours2Minutes, Hours2Seconds, Hours2US, MS2Days_Rounded, MS2Days_Truncated, MS2Hours_Rounded, MS2Hours_Truncated, MS2Minutes_Rounded, MS2Minutes_Truncated, MS2Seconds_Rounded, MS2Seconds_Truncated, MS2US, Minutes2Days_Rounded, Minutes2Days_Truncated, Minutes2Hours_Rounded, Minutes2Hours_Truncated, Minutes2Seconds, Minutes2US, Seconds2Days_Rounded, Seconds2Days_Truncated, Seconds2Hours_Rounded, Seconds2Hours_Truncated, Seconds2MS, Seconds2Minutes_Rounded, Seconds2Minutes_Truncated, Seconds2US, US2Days_Rounded, US2Days_Truncated, US2Hours_Rounded, US2Hours_Truncated, US2MS_Rounded, US2MS_Truncated, US2Minutes_Rounded, US2Minutes_Truncated, US2Seconds_Rounded, US2Seconds_Truncated

oosmos_Minutes2Seconds is a macro that converts minutes to seconds.

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oosmos_Minutes2Seconds(Minutes)

Macro

See Also

Days2Hours, Days2MS, Days2Minutes, Days2Seconds, Days2US, Divide_Integral_Rounded, Hours2Days_Rounded, Hours2Days_Truncated, Hours2MS, Hours2Minutes, Hours2Seconds, Hours2US, MS2Days_Rounded, MS2Days_Truncated, MS2Hours_Rounded, MS2Hours_Truncated, MS2Minutes_Rounded, MS2Minutes_Truncated, MS2Seconds_Rounded, MS2Seconds_Truncated, MS2US, Minutes2Days_Rounded, Minutes2Days_Truncated, Minutes2Hours_Rounded, Minutes2Hours_Truncated, Minutes2MS, Minutes2US, Seconds2Days_Rounded, Seconds2Days_Truncated, Seconds2Hours_Rounded, Seconds2Hours_Truncated, Seconds2MS, Seconds2Minutes_Rounded, Seconds2Minutes_Truncated, Seconds2US, US2Days_Rounded, US2Days_Truncated, US2Hours_Rounded, US2Hours_Truncated, US2MS_Rounded, US2MS_Truncated, US2Minutes_Rounded, US2Minutes_Truncated, US2Seconds_Rounded, US2Seconds_Truncated

oosmos_Minutes2US is a macro that converts minutes to microseconds.

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oosmos_Minutes2US(Minutes)

Macro

See Also

Days2Hours, Days2MS, Days2Minutes, Days2Seconds, Days2US, Divide_Integral_Rounded, Hours2Days_Rounded, Hours2Days_Truncated, Hours2MS, Hours2Minutes, Hours2Seconds, Hours2US, MS2Days_Rounded, MS2Days_Truncated, MS2Hours_Rounded, MS2Hours_Truncated, MS2Minutes_Rounded, MS2Minutes_Truncated, MS2Seconds_Rounded, MS2Seconds_Truncated, MS2US, Minutes2Days_Rounded, Minutes2Days_Truncated, Minutes2Hours_Rounded, Minutes2Hours_Truncated, Minutes2MS, Minutes2Seconds, Seconds2Days_Rounded, Seconds2Days_Truncated, Seconds2Hours_Rounded, Seconds2Hours_Truncated, Seconds2MS, Seconds2Minutes_Rounded, Seconds2Minutes_Truncated, Seconds2US, US2Days_Rounded, US2Days_Truncated, US2Hours_Rounded, US2Hours_Truncated, US2MS_Rounded, US2MS_Truncated, US2Minutes_Rounded, US2Minutes_Truncated, US2Seconds_Rounded, US2Seconds_Truncated

oosmos_MS2Days_Rounded is a macro that converts milliseconds to days with the result being rounded for better precision. If speed is more important than accuracy, see the truncated version of this macro.

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oosmos_MS2Days_Rounded(Milliseconds)

Macro

See Also

Days2Hours, Days2MS, Days2Minutes, Days2Seconds, Days2US, Divide_Integral_Rounded, Hours2Days_Rounded, Hours2Days_Truncated, Hours2MS, Hours2Minutes, Hours2Seconds, Hours2US, MS2Days_Truncated, MS2Hours_Rounded, MS2Hours_Truncated, MS2Minutes_Rounded, MS2Minutes_Truncated, MS2Seconds_Rounded, MS2Seconds_Truncated, MS2US, Minutes2Days_Rounded, Minutes2Days_Truncated, Minutes2Hours_Rounded, Minutes2Hours_Truncated, Minutes2MS, Minutes2Seconds, Minutes2US, Seconds2Days_Rounded, Seconds2Days_Truncated, Seconds2Hours_Rounded, Seconds2Hours_Truncated, Seconds2MS, Seconds2Minutes_Rounded, Seconds2Minutes_Truncated, Seconds2US, US2Days_Rounded, US2Days_Truncated, US2Hours_Rounded, US2Hours_Truncated, US2MS_Rounded, US2MS_Truncated, US2Minutes_Rounded, US2Minutes_Truncated, US2Seconds_Rounded, US2Seconds_Truncated

oosmos_MS2Days_Truncated is a macro that converts milliseconds to days with the result being truncated due to default integral division behavior. If precision is important, see the rounded version of this macro.

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oosmos_MS2Days_Truncated(Milliseconds)

Macro

See Also

Days2Hours, Days2MS, Days2Minutes, Days2Seconds, Days2US, Divide_Integral_Rounded, Hours2Days_Rounded, Hours2Days_Truncated, Hours2MS, Hours2Minutes, Hours2Seconds, Hours2US, MS2Days_Rounded, MS2Hours_Rounded, MS2Hours_Truncated, MS2Minutes_Rounded, MS2Minutes_Truncated, MS2Seconds_Rounded, MS2Seconds_Truncated, MS2US, Minutes2Days_Rounded, Minutes2Days_Truncated, Minutes2Hours_Rounded, Minutes2Hours_Truncated, Minutes2MS, Minutes2Seconds, Minutes2US, Seconds2Days_Rounded, Seconds2Days_Truncated, Seconds2Hours_Rounded, Seconds2Hours_Truncated, Seconds2MS, Seconds2Minutes_Rounded, Seconds2Minutes_Truncated, Seconds2US, US2Days_Rounded, US2Days_Truncated, US2Hours_Rounded, US2Hours_Truncated, US2MS_Rounded, US2MS_Truncated, US2Minutes_Rounded, US2Minutes_Truncated, US2Seconds_Rounded, US2Seconds_Truncated

oosmos_MS2Hours_Rounded is a macro that converts milliseconds to hours with the result being rounded for better precision. If speed is more important than accuracy, see the truncated version of this macro.

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oosmos_MS2Hours_Rounded(Milliseconds)

Macro

See Also

Days2Hours, Days2MS, Days2Minutes, Days2Seconds, Days2US, Divide_Integral_Rounded, Hours2Days_Rounded, Hours2Days_Truncated, Hours2MS, Hours2Minutes, Hours2Seconds, Hours2US, MS2Days_Rounded, MS2Days_Truncated, MS2Hours_Truncated, MS2Minutes_Rounded, MS2Minutes_Truncated, MS2Seconds_Rounded, MS2Seconds_Truncated, MS2US, Minutes2Days_Rounded, Minutes2Days_Truncated, Minutes2Hours_Rounded, Minutes2Hours_Truncated, Minutes2MS, Minutes2Seconds, Minutes2US, Seconds2Days_Rounded, Seconds2Days_Truncated, Seconds2Hours_Rounded, Seconds2Hours_Truncated, Seconds2MS, Seconds2Minutes_Rounded, Seconds2Minutes_Truncated, Seconds2US, US2Days_Rounded, US2Days_Truncated, US2Hours_Rounded, US2Hours_Truncated, US2MS_Rounded, US2MS_Truncated, US2Minutes_Rounded, US2Minutes_Truncated, US2Seconds_Rounded, US2Seconds_Truncated

oosmos_MS2Hours_Truncated is a macro that converts milliseconds to hours with the result being truncated due to default integral division behavior. If precision is important, see the rounded version of this macro.

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oosmos_MS2Hours_Truncated(Milliseconds)

Macro

See Also

Days2Hours, Days2MS, Days2Minutes, Days2Seconds, Days2US, Divide_Integral_Rounded, Hours2Days_Rounded, Hours2Days_Truncated, Hours2MS, Hours2Minutes, Hours2Seconds, Hours2US, MS2Days_Rounded, MS2Days_Truncated, MS2Hours_Rounded, MS2Minutes_Rounded, MS2Minutes_Truncated, MS2Seconds_Rounded, MS2Seconds_Truncated, MS2US, Minutes2Days_Rounded, Minutes2Days_Truncated, Minutes2Hours_Rounded, Minutes2Hours_Truncated, Minutes2MS, Minutes2Seconds, Minutes2US, Seconds2Days_Rounded, Seconds2Days_Truncated, Seconds2Hours_Rounded, Seconds2Hours_Truncated, Seconds2MS, Seconds2Minutes_Rounded, Seconds2Minutes_Truncated, Seconds2US, US2Days_Rounded, US2Days_Truncated, US2Hours_Rounded, US2Hours_Truncated, US2MS_Rounded, US2MS_Truncated, US2Minutes_Rounded, US2Minutes_Truncated, US2Seconds_Rounded, US2Seconds_Truncated

oosmos_MS2Minutes_Rounded is a macro that converts milliseconds to minutes with the result being rounded for better precision. If speed is more important than accuracy, see the truncated version of this macro.

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oosmos_MS2Minutes_Rounded(Milliseconds)

Macro

See Also

Days2Hours, Days2MS, Days2Minutes, Days2Seconds, Days2US, Divide_Integral_Rounded, Hours2Days_Rounded, Hours2Days_Truncated, Hours2MS, Hours2Minutes, Hours2Seconds, Hours2US, MS2Days_Rounded, MS2Days_Truncated, MS2Hours_Rounded, MS2Hours_Truncated, MS2Minutes_Truncated, MS2Seconds_Rounded, MS2Seconds_Truncated, MS2US, Minutes2Days_Rounded, Minutes2Days_Truncated, Minutes2Hours_Rounded, Minutes2Hours_Truncated, Minutes2MS, Minutes2Seconds, Minutes2US, Seconds2Days_Rounded, Seconds2Days_Truncated, Seconds2Hours_Rounded, Seconds2Hours_Truncated, Seconds2MS, Seconds2Minutes_Rounded, Seconds2Minutes_Truncated, Seconds2US, US2Days_Rounded, US2Days_Truncated, US2Hours_Rounded, US2Hours_Truncated, US2MS_Rounded, US2MS_Truncated, US2Minutes_Rounded, US2Minutes_Truncated, US2Seconds_Rounded, US2Seconds_Truncated

oosmos_MS2Minutes_Truncated is a macro that converts milliseconds to minutes with the result being truncated due to default integral division behavior. If precision is important, see the rounded version of this macro.

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oosmos_MS2Minutes_Truncated(Milliseconds)

Macro

See Also

Days2Hours, Days2MS, Days2Minutes, Days2Seconds, Days2US, Divide_Integral_Rounded, Hours2Days_Rounded, Hours2Days_Truncated, Hours2MS, Hours2Minutes, Hours2Seconds, Hours2US, MS2Days_Rounded, MS2Days_Truncated, MS2Hours_Rounded, MS2Hours_Truncated, MS2Minutes_Rounded, MS2Seconds_Rounded, MS2Seconds_Truncated, MS2US, Minutes2Days_Rounded, Minutes2Days_Truncated, Minutes2Hours_Rounded, Minutes2Hours_Truncated, Minutes2MS, Minutes2Seconds, Minutes2US, Seconds2Days_Rounded, Seconds2Days_Truncated, Seconds2Hours_Rounded, Seconds2Hours_Truncated, Seconds2MS, Seconds2Minutes_Rounded, Seconds2Minutes_Truncated, Seconds2US, US2Days_Rounded, US2Days_Truncated, US2Hours_Rounded, US2Hours_Truncated, US2MS_Rounded, US2MS_Truncated, US2Minutes_Rounded, US2Minutes_Truncated, US2Seconds_Rounded, US2Seconds_Truncated

oosmos_MS2Seconds_Rounded is a macro that converts milliseconds to seconds with the result being rounded for better precision. If speed is more important than accuracy, see the truncated version of this macro.

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oosmos_MS2Seconds_Rounded(Milliseconds)

Macro

See Also

Days2Hours, Days2MS, Days2Minutes, Days2Seconds, Days2US, Divide_Integral_Rounded, Hours2Days_Rounded, Hours2Days_Truncated, Hours2MS, Hours2Minutes, Hours2Seconds, Hours2US, MS2Days_Rounded, MS2Days_Truncated, MS2Hours_Rounded, MS2Hours_Truncated, MS2Minutes_Rounded, MS2Minutes_Truncated, MS2Seconds_Truncated, MS2US, Minutes2Days_Rounded, Minutes2Days_Truncated, Minutes2Hours_Rounded, Minutes2Hours_Truncated, Minutes2MS, Minutes2Seconds, Minutes2US, Seconds2Days_Rounded, Seconds2Days_Truncated, Seconds2Hours_Rounded, Seconds2Hours_Truncated, Seconds2MS, Seconds2Minutes_Rounded, Seconds2Minutes_Truncated, Seconds2US, US2Days_Rounded, US2Days_Truncated, US2Hours_Rounded, US2Hours_Truncated, US2MS_Rounded, US2MS_Truncated, US2Minutes_Rounded, US2Minutes_Truncated, US2Seconds_Rounded, US2Seconds_Truncated

oosmos_MS2Seconds_Truncated is a macro that converts milliseconds to seconds with the result being truncated due to default integral division behavior. If precision is important, see the rounded version of this macro.

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oosmos_MS2Seconds_Truncated(Milliseconds)

Macro

See Also

Days2Hours, Days2MS, Days2Minutes, Days2Seconds, Days2US, Divide_Integral_Rounded, Hours2Days_Rounded, Hours2Days_Truncated, Hours2MS, Hours2Minutes, Hours2Seconds, Hours2US, MS2Days_Rounded, MS2Days_Truncated, MS2Hours_Rounded, MS2Hours_Truncated, MS2Minutes_Rounded, MS2Minutes_Truncated, MS2Seconds_Rounded, MS2US, Minutes2Days_Rounded, Minutes2Days_Truncated, Minutes2Hours_Rounded, Minutes2Hours_Truncated, Minutes2MS, Minutes2Seconds, Minutes2US, Seconds2Days_Rounded, Seconds2Days_Truncated, Seconds2Hours_Rounded, Seconds2Hours_Truncated, Seconds2MS, Seconds2Minutes_Rounded, Seconds2Minutes_Truncated, Seconds2US, US2Days_Rounded, US2Days_Truncated, US2Hours_Rounded, US2Hours_Truncated, US2MS_Rounded, US2MS_Truncated, US2Minutes_Rounded, US2Minutes_Truncated, US2Seconds_Rounded, US2Seconds_Truncated

oosmos_MS2US is a macro that converts milliseconds to microseconds.

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oosmos_MS2US(Milliseconds)

Macro

See Also

Days2Hours, Days2MS, Days2Minutes, Days2Seconds, Days2US, Divide_Integral_Rounded, Hours2Days_Rounded, Hours2Days_Truncated, Hours2MS, Hours2Minutes, Hours2Seconds, Hours2US, MS2Days_Rounded, MS2Days_Truncated, MS2Hours_Rounded, MS2Hours_Truncated, MS2Minutes_Rounded, MS2Minutes_Truncated, MS2Seconds_Rounded, MS2Seconds_Truncated, Minutes2Days_Rounded, Minutes2Days_Truncated, Minutes2Hours_Rounded, Minutes2Hours_Truncated, Minutes2MS, Minutes2Seconds, Minutes2US, Seconds2Days_Rounded, Seconds2Days_Truncated, Seconds2Hours_Rounded, Seconds2Hours_Truncated, Seconds2MS, Seconds2Minutes_Rounded, Seconds2Minutes_Truncated, Seconds2US, US2Days_Rounded, US2Days_Truncated, US2Hours_Rounded, US2Hours_Truncated, US2MS_Rounded, US2MS_Truncated, US2Minutes_Rounded, US2Minutes_Truncated, US2Seconds_Rounded, US2Seconds_Truncated

oosmos_NOP is the reserved "no event" event code (0). OOSMOS uses it internally to mark empty events and initialized subscriber list entries. Because event code 0 is reserved, user-defined event codes must start at 1.

See Also

EMPTY_EVENT, sEvent

Creates an Object Thread. See line 23 for an example of the declaration and line 50 for an example of its creation. See lines 30-44 for the thread itself.

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void oosmos_ObjectThreadInit(pObject, pObjectThread, pFunc, bRunning);

Macro

pObject	Pointer to the object.
ObjectThread	The name of the object member of type `oosmos_sObjectThread`.
pFunc	The thread function.
bRunning	Indicates whether the thread should start right away. If `false`, then use `oosmos_ObjectThreadStart()` and `oosmos_ObjectThreadStop()` to start and stop the thread.
See Also	`ObjectThreadRestart`, `ObjectThreadStart`, `ObjectThreadStop`, `sObjectThread`

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//	[MIT]
// OOSMOS toggle Class
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#ifndef toggleMAX
#define toggleMAX 5
#endif

//===================================

#include "oosmos.h"
#include "pin.h"
#include "toggle.h"
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>

struct toggleTag
{
oosmos_sObjectThread m_ObjectThread;

pin * m_pPin;
uint32_t m_TimeOnMS;
uint32_t m_TimeOffMS;
};

static void ToggleThread(const toggle * pToggle, oosmos_sState * pState)
{
oosmos_POINTER_GUARD(pToggle);
oosmos_POINTER_GUARD(pState);

oosmos_ThreadBegin();
for (;;) {
pinOn(pToggle->m_pPin);
oosmos_ThreadDelayMS(pToggle->m_TimeOnMS);

pinOff(pToggle->m_pPin);
oosmos_ThreadDelayMS(pToggle->m_TimeOffMS);
}
oosmos_ThreadEnd();
}

extern toggle * toggleNew(pin * pPin, uint32_t TimeOnMS, uint32_t TimeOffMS)
{
oosmos_Allocate(pToggle, toggle, toggleMAX, NULL);

oosmos_ObjectThreadInit(pToggle, m_ObjectThread, ToggleThread, true);

pToggle->m_pPin = pPin;
pToggle->m_TimeOnMS = TimeOnMS;
pToggle->m_TimeOffMS = TimeOffMS;

return pToggle;
}

oosmos/Classes/toggle.c

Restarts an Object Thread from its first statement, whether the thread is currently running or stopped.

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void oosmos_ObjectThreadRestart(oosmos_sObjectThread * pObjectThread);

Prototype

pObjectThread	Pointer to the `oosmos_sObjectThread` object member.
See Also	`ObjectThreadInit`, `ObjectThreadStart`, `ObjectThreadStop`, `sObjectThread`

Starts a previously created Object Thread.

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void oosmos_ObjectThreadStart(oosmos_sObjectThread * pObjectThread);

Prototype

pObjectThread	Pointer to the `oosmos_sObjectThread` object member.
See Also	`ObjectThreadInit`, `ObjectThreadRestart`, `ObjectThreadStop`, `sObjectThread`

Stops an Object Thread. Use oosmos_ObjectThreadStart to restart it.

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void oosmos_ObjectThreadStop(oosmos_sObjectThread * pObjectThread);

Prototype

pObjectThread	Pointer to the `oosmos_sObjectThread` object member.
See Also	`ObjectThreadInit`, `ObjectThreadRestart`, `ObjectThreadStart`, `sObjectThread`

oosmos_ORTHO is a preprocessor macro that, when defined, compiles in all the OOSMOS orthogonal state machine features.
The default is #undef which will compile the smallest possible footprint. Of course if you use orthogonal states in any object in your build, you will have to #define it during compilation.
You can either define it on the compilation command line (usually -Doosmos_ORTHO), or add a #define oosmos_ORTHO at the top of both oosmos.h and oosmos.c.

See Also

OrthoInit, OrthoRegionInit, sOrtho, sOrthoRegion

oosmos_OrthoInit initializes an oosmos_sOrtho state.
See line 142 of the code snippet below for an example.

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void oosmos_OrthoInit(pObject, OrthoState, ParentState, pCode)

Prototype

pObject	The address of the object that contains the state machine.
OrthoState	The name of the Ortho state.
ParentState	The name of the parent state.
pCode	The address of the event code function or NULL.

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//	[MIT]
// OOSMOS Completion Example
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#include "oosmos.h"	[...]
#include <stdbool.h>
#include <stdio.h>

//>>>EVENTS
enum {
evA = 1,
evB = 2,
evStop = 3
};

#ifdef oosmos_DEBUG
static const char * OOSMOS_EventNames(int EventCode)
{
switch (EventCode) {
case evA: return "evA";
case evB: return "evB";
case evStop: return "evStop";
default: return "";
}
}
#endif
//<<<EVENTS

typedef struct testTag test;

typedef union {
oosmos_sEvent Base;
} uEvents;

struct testTag
{
//>>>DECL
oosmos_sStateMachine(ROOT, uEvents, 3);
oosmos_sOrtho Ortho_State;
oosmos_sOrthoRegion Ortho_Region1_State;
oosmos_sLeaf Ortho_Region1_Idle_State;
oosmos_sLeaf Ortho_Region1_Moving_State;
oosmos_sFinal Ortho_Region1_Final1_State;
oosmos_sOrthoRegion Ortho_Region2_State;
oosmos_sLeaf Ortho_Region2_Idle_State;
oosmos_sLeaf Ortho_Region2_Moving_State;
oosmos_sFinal Ortho_Region2_Final2_State;
oosmos_sLeaf Complete_State;
//<<<DECL
};

//>>>CODE
static bool Ortho_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_COMPLETE: {
return oosmos_Transition(pTest, pState, Complete_State);
}
}

return false;
}

static bool Ortho_Region1_Idle_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case evA: {
return oosmos_Transition(pTest, pState, Ortho_Region1_Moving_State);
}
}

return false;
}

static bool Ortho_Region1_Moving_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case evStop: {
return oosmos_Transition(pTest, pState, Ortho_Region1_Final1_State);
}
}

return false;
}

static bool Ortho_Region2_Idle_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case evB: {
return oosmos_Transition(pTest, pState, Ortho_Region2_Moving_State);
}
}

return false;
}

static bool Ortho_Region2_Moving_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case evStop: {
return oosmos_Transition(pTest, pState, Ortho_Region2_Final2_State);
}
}

return false;
}

static bool Complete_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
switch (oosmos_EventCode(pEvent)) {
case oosmos_ENTER: {
printf("\n--Goal State Achieved--\n");
return true;
}
}

oosmos_UNUSED(pObject);
oosmos_UNUSED(pState);
return false;
}
//<<<CODE

static test * testNew(void)
{
oosmos_Allocate(pTest, test, 1, NULL);

//>>>INIT
oosmos_StateMachineInit(pTest, ROOT, NULL, Ortho_State);
oosmos_OrthoInit(pTest, Ortho_State, ROOT, Ortho_State_Code);
oosmos_OrthoRegionInit(pTest, Ortho_Region1_State, Ortho_State, Ortho_Region1_Idle_State, NULL);
oosmos_LeafInit(pTest, Ortho_Region1_Idle_State, Ortho_Region1_State, Ortho_Region1_Idle_State_Code);
oosmos_LeafInit(pTest, Ortho_Region1_Moving_State, Ortho_Region1_State, Ortho_Region1_Moving_State_Code);
oosmos_FinalInit(pTest, Ortho_Region1_Final1_State, Ortho_Region1_State, NULL);
oosmos_OrthoRegionInit(pTest, Ortho_Region2_State, Ortho_State, Ortho_Region2_Idle_State, NULL);
oosmos_LeafInit(pTest, Ortho_Region2_Idle_State, Ortho_Region2_State, Ortho_Region2_Idle_State_Code);
oosmos_LeafInit(pTest, Ortho_Region2_Moving_State, Ortho_Region2_State, Ortho_Region2_Moving_State_Code);
oosmos_FinalInit(pTest, Ortho_Region2_Final2_State, Ortho_Region2_State, NULL);
oosmos_LeafInit(pTest, Complete_State, ROOT, Complete_State_Code);

oosmos_Debug(pTest, OOSMOS_EventNames);
//<<<INIT

return pTest;
}

static void QueueEvent(const test * pTest, int EventCode)	[...]
{
oosmos_PushEventCode(pTest, EventCode);
oosmos_RunStateMachines();
}

extern int main(void)
{
test * pTest = testNew();

QueueEvent(pTest, evA);
QueueEvent(pTest, evB);
QueueEvent(pTest, evStop);

if (oosmos_IsInState(pTest, &pTest->Complete_State)) {
printf("SUCCESS\n");
} else {
printf("FAILURE\n");
}

return 0;
}

oosmos/Examples/Ortho/Windows/Completion.c

oosmos_OrthoRegionInit initializes an oosmos_sOrthoRegion state.
See line 85 of the code snippet below for an example.

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void oosmos_OrthoRegionInit(pObject, LeafState, ParentState, DefaultState, pCode);

Prototype

pObject	The address of the object that contains the state machine.
OrthoState	The name of the ortho state.
ParentState	The name of the parent state.
DefaultState	The name of the default state.
pCode	The address of the event code function or NULL.

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//	[MIT]
// OOSMOS EnterExit Example
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#include "oosmos.h"	[...]
#include <stdbool.h>
#include <stdio.h>

//>>>EVENTS
enum {
evTweak = 1
};

#ifdef oosmos_DEBUG
static const char * OOSMOS_EventNames(int EventCode)
{
switch (EventCode) {
case evTweak: return "evTweak";
default: return "";
}
}
#endif
//<<<EVENTS

typedef struct testTag test;

typedef union {
oosmos_sEvent Base;
} uEvents;

struct testTag
{
//>>>DECL
oosmos_sStateMachine(ROOT, uEvents, 3);
oosmos_sOrtho Active_State;
oosmos_sOrthoRegion Active_Region1_State;
oosmos_sLeaf Active_Region1_Moving_State;
oosmos_sOrthoRegion Active_Region2_State;
oosmos_sComposite Active_Region2_Outer_State;
oosmos_sLeaf Active_Region2_Outer_Inner_State;
oosmos_sOrthoRegion Active_Region3_State;
oosmos_sLeaf Active_Region3_Leaf_State;
oosmos_sLeaf Active_Region3_Running_State;
//<<<DECL
};

//>>>CODE
static bool Active_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case evTweak: {
return oosmos_Transition(pTest, pState, Active_Region2_Outer_State);
}
}

return false;
}

static bool Active_Region3_Leaf_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_COMPLETE: {
return oosmos_Transition(pTest, pState, Active_Region3_Running_State);
}
}

return false;
}
//<<<CODE

static test * testNew(void)
{
oosmos_Allocate(pTest, test, 1, NULL);

//>>>INIT
oosmos_StateMachineInit(pTest, ROOT, NULL, Active_State);
oosmos_OrthoInit(pTest, Active_State, ROOT, Active_State_Code);
oosmos_OrthoRegionInit(pTest, Active_Region1_State, Active_State, Active_Region1_Moving_State, NULL);
oosmos_LeafInit(pTest, Active_Region1_Moving_State, Active_Region1_State, NULL);
oosmos_OrthoRegionInit(pTest, Active_Region2_State, Active_State, Active_Region2_Outer_State, NULL);
oosmos_CompositeInit(pTest, Active_Region2_Outer_State, Active_Region2_State, Active_Region2_Outer_Inner_State, NULL);
oosmos_LeafInit(pTest, Active_Region2_Outer_Inner_State, Active_Region2_Outer_State, NULL);
oosmos_OrthoRegionInit(pTest, Active_Region3_State, Active_State, Active_Region3_Leaf_State, NULL);
oosmos_LeafInit(pTest, Active_Region3_Leaf_State, Active_Region3_State, Active_Region3_Leaf_State_Code);
oosmos_LeafInit(pTest, Active_Region3_Running_State, Active_Region3_State, NULL);

oosmos_Debug(pTest, OOSMOS_EventNames);
//<<<INIT

return pTest;
}

static void QueueEventRoutine(const test * pTest, int EventCode)	[...]
{
oosmos_PushEventCode(pTest, EventCode);
oosmos_RunStateMachines();
}

extern int main(void)
{
test * pTest = testNew();
QueueEventRoutine(pTest, evTweak);

if (oosmos_IsInState(pTest, &pTest->Active_Region2_Outer_Inner_State)) {
printf("SUCCESS\n");
} else {
printf("FAILURE\n");
}

return 0;
}

oosmos/Examples/Ortho/Windows/EnterExit.c

oosmos_POINTER_GUARD guarantees that the passed argument is not NULL. See line 32 in the code snippet below for an example.

See Also

FOREVER, UNUSED

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//	[MIT]
// OOSMOS toggle Class
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#ifndef toggleMAX	[...]
#define toggleMAX 5
#endif

//===================================

#include "oosmos.h"
#include "pin.h"
#include "toggle.h"
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>

struct toggleTag
{
oosmos_sObjectThread m_ObjectThread;

pin * m_pPin;
uint32_t m_TimeOnMS;
uint32_t m_TimeOffMS;
};

static void ToggleThread(const toggle * pToggle, oosmos_sState * pState)
{
oosmos_POINTER_GUARD(pToggle);
oosmos_POINTER_GUARD(pState);

oosmos_ThreadBegin();
for (;;) {
pinOn(pToggle->m_pPin);
oosmos_ThreadDelayMS(pToggle->m_TimeOnMS);

pinOff(pToggle->m_pPin);
oosmos_ThreadDelayMS(pToggle->m_TimeOffMS);
}
oosmos_ThreadEnd();
}
	[...]
extern toggle * toggleNew(pin * pPin, uint32_t TimeOnMS, uint32_t TimeOffMS)
{
oosmos_Allocate(pToggle, toggle, toggleMAX, NULL);

oosmos_ObjectThreadInit(pToggle, m_ObjectThread, ToggleThread, true);

pToggle->m_pPin = pPin;
pToggle->m_TimeOnMS = TimeOnMS;
pToggle->m_TimeOffMS = TimeOffMS;

return pToggle;
}

oosmos/Classes/toggle.c (thread version)

oosmos_POLL is one of the six predefined event macros. This event is generated each time the state machine is executed while this state is the currently active state. See line 135 in the code snippet below for an example.

See Also

COMPLETE, DEFAULT, ENTER, EXIT, TIMEOUT

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//	[MIT]
// OOSMOS Poll Test
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#include "oosmos.h"	[...]
#include <stdbool.h>
#include <stdio.h>

//>>>EVENTS
//<<<EVENTS

typedef struct testTag test;

const unsigned TargetCount = 3;

struct testTag
{
//>>>DECL
oosmos_sStateMachineNoQueue(ROOT);
oosmos_sLeaf TestingNullTransitionWithoutPoll_State;
oosmos_sOrtho Ortho_State;
oosmos_sOrthoRegion Ortho_Region1_State;
oosmos_sComposite Ortho_Region1_A1_State;
oosmos_sComposite Ortho_Region1_A1_B1_State;
oosmos_sLeaf Ortho_Region1_A1_B1_C1_State;
oosmos_sOrthoRegion Ortho_Region2_State;
oosmos_sComposite Ortho_Region2_A2_State;
oosmos_sComposite Ortho_Region2_A2_B2_State;
oosmos_sLeaf Ortho_Region2_A2_B2_C2_State;
oosmos_sLeaf TestNullTransitionWithPoll_State;
oosmos_sLeaf Done_State;
//<<<DECL

unsigned m_Ortho;

unsigned m_A1_Count;
unsigned m_B1_Count;
unsigned m_C1_Count;

unsigned m_A2_Count;
unsigned m_B2_Count;
unsigned m_C2_Count;
};

static bool CheckCounts(const test * pTest)
{
return pTest->m_Ortho > TargetCount &&
pTest->m_A1_Count > TargetCount && pTest->m_B1_Count > TargetCount && pTest->m_C1_Count > TargetCount &&
pTest->m_A2_Count > TargetCount && pTest->m_B2_Count > TargetCount && pTest->m_C2_Count > TargetCount;
}

static void TestNullThread(test * pTest, oosmos_sState * pState)
{
oosmos_UNUSED(pTest);

oosmos_ThreadBegin();
printf("DELAY 50ms\n");
oosmos_ThreadDelayMS(50);

printf("DELAY 100ms\n");
oosmos_ThreadDelayMS(100);
oosmos_ThreadEnd();
}

static void OrthoPoll(test * pTest)
{
printf("Poll Ortho\n");
pTest->m_Ortho++;
}

static void A1Thread(test * pTest, oosmos_sState * pState)
{
oosmos_ThreadBegin();
for (;;) {
printf("Poll A1: %u\n", pTest->m_A1_Count);
pTest->m_A1_Count++;
oosmos_ThreadDelayMS(20);
}
oosmos_ThreadEnd();
}

static void B1Poll(test * pTest)
{
printf("Poll B1: %u\n", pTest->m_B1_Count);
pTest->m_B1_Count++;
}

static void C1Poll(test * pTest)
{
printf("Poll C1: %u\n", pTest->m_C1_Count);
pTest->m_C1_Count++;
}

static void A2Poll(test * pTest)
{
printf("Poll A2: %u\n", pTest->m_A2_Count);
pTest->m_A2_Count++;
}

static void B2Poll(test * pTest)
{
printf("Poll B2: %u\n", pTest->m_B2_Count);
pTest->m_B2_Count++;
}

static void C2Poll(test * pTest)
{
printf("Poll C2: %u\n", pTest->m_C2_Count);
pTest->m_C2_Count++;
}


//>>>CODE
static bool TestingNullTransitionWithoutPoll_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_COMPLETE: {
return oosmos_Transition(pTest, pState, Ortho_State);
}
}

return false;
}

static bool Ortho_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_POLL: {
OrthoPoll(pTest);
if (CheckCounts(pTest)) {
return oosmos_Transition(pTest, pState, TestNullTransitionWithPoll_State);
}
return true;
}
}

return false;
}

static bool Ortho_Region1_A1_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)	[...]
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_POLL: {
A1Thread(pTest, pState);
return true;
}
}

return false;
}

static bool Ortho_Region1_A1_B1_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_POLL: {
B1Poll(pTest);
return true;
}
}

oosmos_UNUSED(pState);
return false;
}

static bool Ortho_Region1_A1_B1_C1_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_POLL: {
C1Poll(pTest);
return true;
}
}

oosmos_UNUSED(pState);
return false;
}

static bool Ortho_Region2_A2_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_POLL: {
A2Poll(pTest);
return true;
}
}

oosmos_UNUSED(pState);
return false;
}

static bool Ortho_Region2_A2_B2_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_POLL: {
B2Poll(pTest);
return true;
}
}

oosmos_UNUSED(pState);
return false;
}

static bool Ortho_Region2_A2_B2_C2_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_POLL: {
C2Poll(pTest);
return true;
}
}

oosmos_UNUSED(pState);
return false;
}

static bool TestNullTransitionWithPoll_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_POLL: {
TestNullThread(pTest, pState);
return true;
}
case oosmos_COMPLETE: {
return oosmos_Transition(pTest, pState, Done_State);
}
}

return false;
}

static bool Done_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
switch (oosmos_EventCode(pEvent)) {
case oosmos_ENTER: {
printf("SUCCESS!\nTerminating program.\n");
oosmos_EndProgram(1);
return true;
}
}

oosmos_UNUSED(pObject);
oosmos_UNUSED(pState);
return false;
}
//<<<CODE

static test * testNew(void)
{
oosmos_Allocate(pTest, test, 1, NULL);

//>>>INIT
oosmos_StateMachineInitNoQueue(pTest, ROOT, NULL, TestingNullTransitionWithoutPoll_State);
oosmos_LeafInit(pTest, TestingNullTransitionWithoutPoll_State, ROOT, TestingNullTransitionWithoutPoll_State_Code);
oosmos_OrthoInit(pTest, Ortho_State, ROOT, Ortho_State_Code);
oosmos_OrthoRegionInit(pTest, Ortho_Region1_State, Ortho_State, Ortho_Region1_A1_State, NULL);
oosmos_CompositeInit(pTest, Ortho_Region1_A1_State, Ortho_Region1_State, Ortho_Region1_A1_B1_State, Ortho_Region1_A1_State_Code);
oosmos_CompositeInit(pTest, Ortho_Region1_A1_B1_State, Ortho_Region1_A1_State, Ortho_Region1_A1_B1_C1_State, Ortho_Region1_A1_B1_State_Code);
oosmos_LeafInit(pTest, Ortho_Region1_A1_B1_C1_State, Ortho_Region1_A1_B1_State, Ortho_Region1_A1_B1_C1_State_Code);
oosmos_OrthoRegionInit(pTest, Ortho_Region2_State, Ortho_State, Ortho_Region2_A2_State, NULL);
oosmos_CompositeInit(pTest, Ortho_Region2_A2_State, Ortho_Region2_State, Ortho_Region2_A2_B2_State, Ortho_Region2_A2_State_Code);
oosmos_CompositeInit(pTest, Ortho_Region2_A2_B2_State, Ortho_Region2_A2_State, Ortho_Region2_A2_B2_C2_State, Ortho_Region2_A2_B2_State_Code);
oosmos_LeafInit(pTest, Ortho_Region2_A2_B2_C2_State, Ortho_Region2_A2_B2_State, Ortho_Region2_A2_B2_C2_State_Code);
oosmos_LeafInit(pTest, TestNullTransitionWithPoll_State, ROOT, TestNullTransitionWithPoll_State_Code);
oosmos_LeafInit(pTest, Done_State, ROOT, Done_State_Code);

oosmos_Debug(pTest, NULL);
//<<<INIT

pTest->m_Ortho = 0;

pTest->m_A1_Count = 0;
pTest->m_B1_Count = 0;
pTest->m_C1_Count = 0;

pTest->m_A2_Count = 0;
pTest->m_B2_Count = 0;
pTest->m_C2_Count = 0;

return pTest;
}

extern int main(void)
{
(void) testNew();

for (;;) {
oosmos_RunStateMachines();
printf("---\n");
oosmos_DelayMS(1);
}
}

oosmos/Tests/Poll.c (thread version)

Allows you to push a complex event onto the object's event queue. Useful for pushing complex events. That is, events that hold more than just an event code.

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oosmos_PushEvent(pObject, Event)

Macro

pObject	Pointer to the object.
Event	Event object to push onto the object's event queue.
See Also	`PushEventCode`

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//	[MIT]
// OOSMOS ThreadEvents Test
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#include "oosmos.h"	[...]
#include <stdbool.h>
#include <stdio.h>

//>>>EVENTS
enum {
evTestEvent = 1
};

#ifdef oosmos_DEBUG
static const char * OOSMOS_EventNames(int EventCode)
{
switch (EventCode) {
case evTestEvent: return "evTestEvent";
default: return "";
}
}
#endif
//<<<EVENTS

typedef struct {
oosmos_sEvent Event;
unsigned Value;
} sTestEvent;

typedef union {
oosmos_sEvent Event;
sTestEvent TestEvent;
} uEvents;

typedef struct testTag test;

struct testTag
{
//>>>DECL
oosmos_sStateMachine(ROOT, uEvents, 3);
oosmos_sOrtho A1_State;
oosmos_sOrthoRegion A1_Region1_State;
oosmos_sLeaf A1_Region1_B1_State;
oosmos_sOrthoRegion A1_Region2_State;
oosmos_sLeaf A1_Region2_EventDriver_State;
oosmos_sLeaf Done_State;
//<<<DECL

};

static void A1Thread(oosmos_sState * pState)
{
const sTestEvent * pTestEvent = NULL;

oosmos_ThreadBegin();
oosmos_ThreadWaitEvent(evTestEvent);
pTestEvent = (sTestEvent *) oosmos_GetCurrentEvent(pState);
printf("ThreadA1: Received evTestEvent, Value %u %s\n", pTestEvent->Value, pTestEvent->Value == 998 ? "SUCCESS" : "FAILURE");

oosmos_ThreadWaitEvent(evTestEvent);
pTestEvent = (sTestEvent *) oosmos_GetCurrentEvent(pState);
printf("ThreadA1: Received evTestEvent, Value %u %s\n", pTestEvent->Value, pTestEvent->Value == 999 ? "SUCCESS" : "FAILURE");
oosmos_ThreadEnd();
}

static void EventDriverThread(const test * pTest, oosmos_sState * pState)
{
static const sTestEvent TestEvent998 = { { evTestEvent, NULL }, 998 };
static const sTestEvent TestEvent999 = { { evTestEvent, NULL }, 999 };

oosmos_ThreadBegin();
printf("EventDriverThread: Enter\n");
oosmos_ThreadDelayMS(1000);

printf("EventDriverThread: Push 998\n");
oosmos_PushEvent(pTest, TestEvent998);

printf("EventDriverThread: Push 999\n");
oosmos_PushEvent(pTest, TestEvent999);
oosmos_ThreadEnd();
}

//>>>CODE	[...]
static bool A1_Region1_B1_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_POLL: {
A1Thread(pState);
return true;
}
case oosmos_COMPLETE: {
return oosmos_Transition(pTest, pState, Done_State);
}
}

return false;
}

static bool Done_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
switch (oosmos_EventCode(pEvent)) {
case oosmos_ENTER: {
oosmos_EndProgram(1);
return true;
}
}

oosmos_UNUSED(pObject);
oosmos_UNUSED(pState);
return false;
}

static bool A1_Region2_EventDriver_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_POLL: {
EventDriverThread(pTest, pState);
return true;
}
}

return false;
}
//<<<CODE

static test * testNew(void)
{
oosmos_Allocate(pTest, test, 1, NULL);

//>>>INIT
oosmos_StateMachineInit(pTest, ROOT, NULL, A1_State);
oosmos_OrthoInit(pTest, A1_State, ROOT, NULL);
oosmos_OrthoRegionInit(pTest, A1_Region1_State, A1_State, A1_Region1_B1_State, NULL);
oosmos_LeafInit(pTest, A1_Region1_B1_State, A1_Region1_State, A1_Region1_B1_State_Code);
oosmos_OrthoRegionInit(pTest, A1_Region2_State, A1_State, A1_Region2_EventDriver_State, NULL);
oosmos_LeafInit(pTest, A1_Region2_EventDriver_State, A1_Region2_State, A1_Region2_EventDriver_State_Code);
oosmos_LeafInit(pTest, Done_State, ROOT, Done_State_Code);

oosmos_Debug(pTest, OOSMOS_EventNames);
//<<<INIT

return pTest;
}

extern int main(void)
{
(void) testNew();

for (;;) {
oosmos_RunStateMachines();
oosmos_DelayMS(1);
}
}

oosmos/Tests/ThreadEvents.c

oosmos_PushEventCode sends an event to an OOSMOS object. (It actually pushes the event to the object's event queue.) If the event is handled by the current state or any of its parent states, then the appropriate action is taken in that state. If the current active state (or its parents) do not handle the event, it will be popped from the queue and no action will take place.
See line 112 for an example.

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void oosmos_PushEventCode(pObject, EventCode);

Prototype

pObject	Pointer to the object that will react to the event.
EventCode	The event code to send. Will always be an event defined inside the implementation's `.c` file.
See Also	`PushEvent`

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//	[MIT]
// OOSMOS - EventDemo example, motor object
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#include "oosmos.h"	[...]
#include "motor.h"
#include <stdbool.h>
#include <stdio.h>

//>>>EVENTS
enum {
evStart = 1,
evStop = 2
};

#ifdef oosmos_DEBUG
static const char * OOSMOS_EventNames(int EventCode)
{
switch (EventCode) {
case evStart: return "evStart";
case evStop: return "evStop";
default: return "";
}
}
#endif
//<<<EVENTS

typedef union {
oosmos_sEvent Event;
} uEvents;

struct motorTag
{
//>>>DECL
oosmos_sStateMachine(ROOT, uEvents, 3);
oosmos_sLeaf Idle_State;
oosmos_sLeaf Moving_State;
//<<<DECL
};

#ifndef motorMAX
#define motorMAX 3
#endif

static void MovingThread(oosmos_sState * pState)
{
oosmos_ThreadBegin();
for (;;) {
printf("motor: MOVING...\n");
oosmos_ThreadDelayMS(500);
}
oosmos_ThreadEnd();
}

//>>>CODE
static bool Idle_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
motor * pMotor = (motor *) pObject;

switch (oosmos_EventCode(pEvent)) {
case evStart: {
return oosmos_Transition(pMotor, pState, Moving_State);
}
}

return false;
}

static bool Moving_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
motor * pMotor = (motor *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_POLL: {
MovingThread(pState);
return true;
}
case evStop: {
return oosmos_Transition(pMotor, pState, Idle_State);
}
}

return false;
}
//<<<CODE

extern motor * motorNew(void)
{
oosmos_Allocate(pMotor, motor, motorMAX, NULL);

//>>>INIT
oosmos_StateMachineInit(pMotor, ROOT, NULL, Idle_State);
oosmos_LeafInit(pMotor, Idle_State, ROOT, Idle_State_Code);
oosmos_LeafInit(pMotor, Moving_State, ROOT, Moving_State_Code);

oosmos_Debug(pMotor, OOSMOS_EventNames);
//<<<INIT

return pMotor;
}

extern void motorOn(const motor * pMotor)
{
oosmos_PushEventCode(pMotor, evStart);
}

extern void motorOff(const motor * pMotor)
{
oosmos_PushEventCode(pMotor, evStop);
}

oosmos/Examples/EventDemo/Windows/motor.c

Constructs a queue of type oosmos_sQueue.
See lines 233 and 235 in the code snippet below for examples.

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void oosmos_QueueConstruct(pQueue, pQueueData, QueueDataSize, QueueElementSize);

Prototype

pQueue	Pointer to a `oosmos_sQueue` item that holds the metadata for the queue.
pQueueData	A pointer to an array that will hold the data for the queue.
QueueDataSize	The total size, in bytes, of the queue data array. Typically specified as `sizeof(QueueData)`. Must not be zero.
QueueElementSize	The size, in bytes, of one element of the queue. Typically specified as `sizeof(QueueData[0])`.
See Also	`QueuePop`, `QueuePush`, `QueueSetBehaviorFunc`, `sQueue`

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//	[MIT]
// OOSMOS uart Class
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#include "oosmos.h"	[...]
#include "uart.h"
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <stdarg.h>

typedef enum
{
sendAwaitingCharToSend_State,
sendAwaitingReady_State,
sendAwaitingComplete_State
} eSendStates;

struct uartTag
{
oosmos_sActiveObject m_ActiveObject;

oosmos_sQueue m_SendDataQueue;
uint8_t m_SendDataQueueData[200];
eSendStates m_SendState;
uint8_t m_CharToSend;

oosmos_sQueue m_ReceiveDataQueue;
uint8_t m_ReceiveDataQueueData[10];
oosmos_sSubscriberList m_ReceivedByteEventSubscribers[1];

uint8_t m_PlibUartID;
uint8_t m_UartModule;
};

#if defined _UART6
#define MaxUARTS 6
#elif defined _UART5
#define MaxUARTS 5
#elif defined _UART4
#define MaxUARTS 4
#elif defined _UART3
#define MaxUARTS 3
#elif defined _UART2
#define MaxUARTS 2
#elif defined _UART1
#define MaxUARTS 1
#endif

static uart UartList[MaxUARTS];
static unsigned UartCount;

static const unsigned UartIndex_to_PlibUartId[] =
{
#ifdef _UART1
UART1,
#endif
#ifdef _UART2
UART2,
#endif
#ifdef _UART3
UART3,
#endif
#ifdef _UART4
UART4,
#endif
#ifdef _UART5
UART5,
#endif
#ifdef _UART6
UART6,
#endif
};

static void EnableInterrupt(uart * pUART)
{
INTEnable(INT_SOURCE_UART_RX(pUART->m_PlibUartID), INT_ENABLED);
}

static void DisableInterrupt(uart * pUART)
{
INTEnable(INT_SOURCE_UART_RX(pUART->m_PlibUartID), INT_DISABLED);
}

static uint16_t GetPriorityBits(const unsigned PriorityNumber)
{
switch (PriorityNumber) {
case 1: return INT_PRIORITY_LEVEL_1;
case 2: return INT_PRIORITY_LEVEL_2;
case 3: return INT_PRIORITY_LEVEL_3;
case 4: return INT_PRIORITY_LEVEL_4;
case 5: return INT_PRIORITY_LEVEL_5;
case 6: return INT_PRIORITY_LEVEL_6;
case 7: return INT_PRIORITY_LEVEL_7;
default: oosmos_FOREVER();
}
}

static void RunReceiverStateMachine(void * pObject)
{
uart * pUART = (uart *) pObject;
uint8_t Byte;

DisableInterrupt(pUART);
const bool PopSuccess = oosmos_QueuePop(&pUART->m_ReceiveDataQueue, &Byte, sizeof(Byte));
EnableInterrupt(pUART);

if (PopSuccess) {
uart_sReceivedByteEvent ReceivedByteEvent = { oosmos_EMPTY_EVENT, Byte };
oosmos_SubscriberListNotifyWithArgs(pUART->m_ReceivedByteEventSubscribers, ReceivedByteEvent);
}
}

static void RunSenderStateMachine(void * pObject)
{
uart * pUART = (uart *) pObject;

switch (pUART->m_SendState) {
case sendAwaitingCharToSend_State: {
const bool PopSuccess = oosmos_QueuePop(&pUART->m_SendDataQueue, &pUART->m_CharToSend, sizeof(pUART->m_CharToSend));

if (PopSuccess)
pUART->m_SendState = sendAwaitingReady_State;

break;
}
case sendAwaitingReady_State: {
if (UARTTransmitterIsReady(pUART->m_PlibUartID)) {
UARTSendDataByte(pUART->m_PlibUartID, pUART->m_CharToSend);
pUART->m_SendState = sendAwaitingComplete_State;
}

break;
}
case sendAwaitingComplete_State: {
if (UARTTransmissionHasCompleted(pUART->m_PlibUartID))
pUART->m_SendState = sendAwaitingCharToSend_State;

break;
}
}
}

static void RunStateMachine(void * pObject)
{
RunSenderStateMachine(pObject);
RunReceiverStateMachine(pObject);
}

static void ISR(const unsigned UartModule)
{
uart * pUART = UartList;

for (unsigned Count = 1; Count <= UartCount; pUART++, Count++) {
if (UartModule <= pUART->m_UartModule) {
break;
}
}

const unsigned PlibUartId = pUART->m_PlibUartID;

if (INTGetFlag(INT_SOURCE_UART_RX(PlibUartId))) {
while (UARTReceivedDataIsAvailable(PlibUartId)) {
const uint8_t Byte = UARTGetDataByte(PlibUartId);
oosmos_QueuePush(&pUART->m_ReceiveDataQueue, &Byte, sizeof(Byte));
}

INTClearFlag(INT_SOURCE_UART_RX(PlibUartId));
}
}

static uint32_t GetPeripheralClock(void)
{
return (oosmos_GetClockSpeedInMHz()*1000000) / (1 << OSCCONbits.PBDIV);
}

extern void uartPrintf(uart * pUART, const char * pFormat, ...)
{
char Buffer[100];
va_list ArgList;

va_start(ArgList, pFormat);
vsprintf(Buffer, pFormat, ArgList);
uartSendString(pUART, Buffer);
}

extern void uartSendChar(uart * pUART, const char Char)
{
oosmos_QueuePush(&pUART->m_SendDataQueue, &Char, sizeof(Char));
}

extern void uartSendString(uart * pUART, const char * pString)
{
uint8_t Char;

while (Char = *pString++, Char) {
uartSendChar(pUART, Char);
}
}

extern void uartStart(uart * pUART)
{
const unsigned PlibUartId = pUART->m_PlibUartID;

UARTEnable(PlibUartId, UART_ENABLE_FLAGS(UART_PERIPHERAL \| UART_RX \| UART_TX));
EnableInterrupt(pUART);
}

//
// 'UartModule' is 1, 2, etc.
//
extern uart * uartNew(const unsigned UartModule, const unsigned BaudRate)
{
oosmos_AllocateVisible(pUART, uart, UartList, UartCount, MaxUARTS, NULL);

pUART->m_UartModule = UartModule;

const unsigned PlibUartID = UartIndex_to_PlibUartId[UartModule-1];
pUART->m_PlibUartID = PlibUartID;

UARTConfigure(PlibUartID, UART_ENABLE_PINS_TX_RX_ONLY);
UARTSetFifoMode(PlibUartID, UART_INTERRUPT_ON_TX_NOT_FULL \| UART_INTERRUPT_ON_RX_NOT_EMPTY);
UARTSetLineControl(PlibUartID, UART_DATA_SIZE_8_BITS \| UART_PARITY_NONE \| UART_STOP_BITS_1);
UARTSetDataRate(PlibUartID, GetPeripheralClock(), BaudRate);

const unsigned Priority = 1;
INTSetVectorPriority(INT_VECTOR_UART(PlibUartID), GetPriorityBits(Priority));
INTSetVectorSubPriority(INT_VECTOR_UART(PlibUartID), INT_SUB_PRIORITY_LEVEL_0);

oosmos_QueueConstruct(&pUART->m_SendDataQueue, pUART->m_SendDataQueueData, sizeof(pUART->m_SendDataQueueData), sizeof(uint8_t));

oosmos_QueueConstruct(&pUART->m_ReceiveDataQueue, pUART->m_ReceiveDataQueueData, sizeof(pUART->m_ReceiveDataQueueData), sizeof(uint8_t));
oosmos_SubscriberListInit(pUART->m_ReceivedByteEventSubscribers);

oosmos_ActiveObjectInit(pUART, m_ActiveObject, RunStateMachine);

return pUART;
}
	[...]
extern void uartSubscribe(uart * pUART, oosmos_sQueue * pQueue, const int EventCode, void * pContext)
{
oosmos_SubscriberListAdd(pUART->m_ReceivedByteEventSubscribers, pQueue, EventCode, pContext);
}

#define uartVector(N) void __ISR(_UART_##N##_VECTOR) IntUart##N##Handler() { ISR(N); }

#ifdef _UART1
uartVector(1)
#endif

#ifdef _UART2
uartVector(2)
#endif

#ifdef _UART3
uartVector(3)
#endif

#ifdef _UART4
uartVector(4)
#endif

#ifdef _UART5
uartVector(5)
#endif

#ifdef _UART6
uartVector(6)
#endif

oosmos/Classes/PIC32/uart.c

If the queue is not empty, oosmos_QueuePop will pop an element off the queue and copy it into an item that you allocate.
See lines 108 and 123 in the code snippet below for examples.

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bool oosmos_QueuePop(oosmos_sQueue * pQueue, void * pPoppedItem, size_t ElementSize);

Prototype

pQueue	Pointer to a `oosmos_sQueue` item that holds the metadata for the queue.
pPoppedItem	A pointer to an item of `ElementSize` size into which the queue item will be popped.
ElementSize	Size of one element of the queue.
RETURN	Returns `true` if an item was popped off the queue, `false` otherwise.
See Also	`QueueConstruct`, `QueuePush`, `QueueSetBehaviorFunc`, `sQueue`

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//	[MIT]
// OOSMOS uart Class
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#include "oosmos.h"	[...]
#include "uart.h"
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <stdarg.h>

typedef enum
{
sendAwaitingCharToSend_State,
sendAwaitingReady_State,
sendAwaitingComplete_State
} eSendStates;

struct uartTag
{
oosmos_sActiveObject m_ActiveObject;

oosmos_sQueue m_SendDataQueue;
uint8_t m_SendDataQueueData[200];
eSendStates m_SendState;
uint8_t m_CharToSend;

oosmos_sQueue m_ReceiveDataQueue;
uint8_t m_ReceiveDataQueueData[10];
oosmos_sSubscriberList m_ReceivedByteEventSubscribers[1];

uint8_t m_PlibUartID;
uint8_t m_UartModule;
};

#if defined _UART6
#define MaxUARTS 6
#elif defined _UART5
#define MaxUARTS 5
#elif defined _UART4
#define MaxUARTS 4
#elif defined _UART3
#define MaxUARTS 3
#elif defined _UART2
#define MaxUARTS 2
#elif defined _UART1
#define MaxUARTS 1
#endif

static uart UartList[MaxUARTS];
static unsigned UartCount;

static const unsigned UartIndex_to_PlibUartId[] =
{
#ifdef _UART1
UART1,
#endif
#ifdef _UART2
UART2,
#endif
#ifdef _UART3
UART3,
#endif
#ifdef _UART4
UART4,
#endif
#ifdef _UART5
UART5,
#endif
#ifdef _UART6
UART6,
#endif
};

static void EnableInterrupt(uart * pUART)
{
INTEnable(INT_SOURCE_UART_RX(pUART->m_PlibUartID), INT_ENABLED);
}

static void DisableInterrupt(uart * pUART)
{
INTEnable(INT_SOURCE_UART_RX(pUART->m_PlibUartID), INT_DISABLED);
}

static uint16_t GetPriorityBits(const unsigned PriorityNumber)
{
switch (PriorityNumber) {
case 1: return INT_PRIORITY_LEVEL_1;
case 2: return INT_PRIORITY_LEVEL_2;
case 3: return INT_PRIORITY_LEVEL_3;
case 4: return INT_PRIORITY_LEVEL_4;
case 5: return INT_PRIORITY_LEVEL_5;
case 6: return INT_PRIORITY_LEVEL_6;
case 7: return INT_PRIORITY_LEVEL_7;
default: oosmos_FOREVER();
}
}

static void RunReceiverStateMachine(void * pObject)
{
uart * pUART = (uart *) pObject;
uint8_t Byte;

DisableInterrupt(pUART);
const bool PopSuccess = oosmos_QueuePop(&pUART->m_ReceiveDataQueue, &Byte, sizeof(Byte));
EnableInterrupt(pUART);

if (PopSuccess) {
uart_sReceivedByteEvent ReceivedByteEvent = { oosmos_EMPTY_EVENT, Byte };
oosmos_SubscriberListNotifyWithArgs(pUART->m_ReceivedByteEventSubscribers, ReceivedByteEvent);
}
}

static void RunSenderStateMachine(void * pObject)
{
uart * pUART = (uart *) pObject;

switch (pUART->m_SendState) {
case sendAwaitingCharToSend_State: {
const bool PopSuccess = oosmos_QueuePop(&pUART->m_SendDataQueue, &pUART->m_CharToSend, sizeof(pUART->m_CharToSend));

if (PopSuccess)
pUART->m_SendState = sendAwaitingReady_State;

break;
}
case sendAwaitingReady_State: {
if (UARTTransmitterIsReady(pUART->m_PlibUartID)) {
UARTSendDataByte(pUART->m_PlibUartID, pUART->m_CharToSend);
pUART->m_SendState = sendAwaitingComplete_State;
}

break;
}
case sendAwaitingComplete_State: {
if (UARTTransmissionHasCompleted(pUART->m_PlibUartID))
pUART->m_SendState = sendAwaitingCharToSend_State;

break;
}
}
}

static void RunStateMachine(void * pObject)	[...]
{
RunSenderStateMachine(pObject);
RunReceiverStateMachine(pObject);
}

static void ISR(const unsigned UartModule)
{
uart * pUART = UartList;

for (unsigned Count = 1; Count <= UartCount; pUART++, Count++) {
if (UartModule <= pUART->m_UartModule) {
break;
}
}

const unsigned PlibUartId = pUART->m_PlibUartID;

if (INTGetFlag(INT_SOURCE_UART_RX(PlibUartId))) {
while (UARTReceivedDataIsAvailable(PlibUartId)) {
const uint8_t Byte = UARTGetDataByte(PlibUartId);
oosmos_QueuePush(&pUART->m_ReceiveDataQueue, &Byte, sizeof(Byte));
}

INTClearFlag(INT_SOURCE_UART_RX(PlibUartId));
}
}

static uint32_t GetPeripheralClock(void)
{
return (oosmos_GetClockSpeedInMHz()*1000000) / (1 << OSCCONbits.PBDIV);
}

extern void uartPrintf(uart * pUART, const char * pFormat, ...)
{
char Buffer[100];
va_list ArgList;

va_start(ArgList, pFormat);
vsprintf(Buffer, pFormat, ArgList);
uartSendString(pUART, Buffer);
}

extern void uartSendChar(uart * pUART, const char Char)
{
oosmos_QueuePush(&pUART->m_SendDataQueue, &Char, sizeof(Char));
}

extern void uartSendString(uart * pUART, const char * pString)
{
uint8_t Char;

while (Char = *pString++, Char) {
uartSendChar(pUART, Char);
}
}

extern void uartStart(uart * pUART)
{
const unsigned PlibUartId = pUART->m_PlibUartID;

UARTEnable(PlibUartId, UART_ENABLE_FLAGS(UART_PERIPHERAL \| UART_RX \| UART_TX));
EnableInterrupt(pUART);
}

//
// 'UartModule' is 1, 2, etc.
//
extern uart * uartNew(const unsigned UartModule, const unsigned BaudRate)
{
oosmos_AllocateVisible(pUART, uart, UartList, UartCount, MaxUARTS, NULL);

pUART->m_UartModule = UartModule;

const unsigned PlibUartID = UartIndex_to_PlibUartId[UartModule-1];
pUART->m_PlibUartID = PlibUartID;

UARTConfigure(PlibUartID, UART_ENABLE_PINS_TX_RX_ONLY);
UARTSetFifoMode(PlibUartID, UART_INTERRUPT_ON_TX_NOT_FULL \| UART_INTERRUPT_ON_RX_NOT_EMPTY);
UARTSetLineControl(PlibUartID, UART_DATA_SIZE_8_BITS \| UART_PARITY_NONE \| UART_STOP_BITS_1);
UARTSetDataRate(PlibUartID, GetPeripheralClock(), BaudRate);

const unsigned Priority = 1;
INTSetVectorPriority(INT_VECTOR_UART(PlibUartID), GetPriorityBits(Priority));
INTSetVectorSubPriority(INT_VECTOR_UART(PlibUartID), INT_SUB_PRIORITY_LEVEL_0);

oosmos_QueueConstruct(&pUART->m_SendDataQueue, pUART->m_SendDataQueueData, sizeof(pUART->m_SendDataQueueData), sizeof(uint8_t));

oosmos_QueueConstruct(&pUART->m_ReceiveDataQueue, pUART->m_ReceiveDataQueueData, sizeof(pUART->m_ReceiveDataQueueData), sizeof(uint8_t));
oosmos_SubscriberListInit(pUART->m_ReceivedByteEventSubscribers);

oosmos_ActiveObjectInit(pUART, m_ActiveObject, RunStateMachine);

return pUART;
}

extern void uartSubscribe(uart * pUART, oosmos_sQueue * pQueue, const int EventCode, void * pContext)
{
oosmos_SubscriberListAdd(pUART->m_ReceivedByteEventSubscribers, pQueue, EventCode, pContext);
}

#define uartVector(N) void __ISR(_UART_##N##_VECTOR) IntUart##N##Handler() { ISR(N); }

#ifdef _UART1
uartVector(1)
#endif

#ifdef _UART2
uartVector(2)
#endif

#ifdef _UART3
uartVector(3)
#endif

#ifdef _UART4
uartVector(4)
#endif

#ifdef _UART5
uartVector(5)
#endif

#ifdef _UART6
uartVector(6)
#endif

oosmos/Classes/PIC32/uart.c

Pushes a single item of size ElementSize onto the queue specified by pQueue.
If the queue is already full at the time of this call, the new item is tossed. Use oosmos_QueueSetBehaviorFunc to be notified when the queue is full and to control which item is tossed.
See lines 168 and 192 in the code snippet below for examples.

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void oosmos_QueuePush(oosmos_sQueue * pQueue, const void * pItemToPush, size_t ElementSize);

Prototype

pQueue	Pointer to a `oosmos_sQueue` item that holds the metadata for the queue.
pItemToPush	A pointer to an item of `ElementSize` size that will be pushed (i.e. copied) onto the queue.
ElementSize	Size of one element of the queue.
See Also	`QueueConstruct`, `QueuePop`, `QueueSetBehaviorFunc`, `sQueue`

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//	[MIT]
// OOSMOS uart Class
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#include "oosmos.h"	[...]
#include "uart.h"
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <stdarg.h>

typedef enum
{
sendAwaitingCharToSend_State,
sendAwaitingReady_State,
sendAwaitingComplete_State
} eSendStates;

struct uartTag
{
oosmos_sActiveObject m_ActiveObject;

oosmos_sQueue m_SendDataQueue;
uint8_t m_SendDataQueueData[200];
eSendStates m_SendState;
uint8_t m_CharToSend;

oosmos_sQueue m_ReceiveDataQueue;
uint8_t m_ReceiveDataQueueData[10];
oosmos_sSubscriberList m_ReceivedByteEventSubscribers[1];

uint8_t m_PlibUartID;
uint8_t m_UartModule;
};

#if defined _UART6
#define MaxUARTS 6
#elif defined _UART5
#define MaxUARTS 5
#elif defined _UART4
#define MaxUARTS 4
#elif defined _UART3
#define MaxUARTS 3
#elif defined _UART2
#define MaxUARTS 2
#elif defined _UART1
#define MaxUARTS 1
#endif

static uart UartList[MaxUARTS];
static unsigned UartCount;

static const unsigned UartIndex_to_PlibUartId[] =
{
#ifdef _UART1
UART1,
#endif
#ifdef _UART2
UART2,
#endif
#ifdef _UART3
UART3,
#endif
#ifdef _UART4
UART4,
#endif
#ifdef _UART5
UART5,
#endif
#ifdef _UART6
UART6,
#endif
};

static void EnableInterrupt(uart * pUART)
{
INTEnable(INT_SOURCE_UART_RX(pUART->m_PlibUartID), INT_ENABLED);
}

static void DisableInterrupt(uart * pUART)
{
INTEnable(INT_SOURCE_UART_RX(pUART->m_PlibUartID), INT_DISABLED);
}

static uint16_t GetPriorityBits(const unsigned PriorityNumber)
{
switch (PriorityNumber) {
case 1: return INT_PRIORITY_LEVEL_1;
case 2: return INT_PRIORITY_LEVEL_2;
case 3: return INT_PRIORITY_LEVEL_3;
case 4: return INT_PRIORITY_LEVEL_4;
case 5: return INT_PRIORITY_LEVEL_5;
case 6: return INT_PRIORITY_LEVEL_6;
case 7: return INT_PRIORITY_LEVEL_7;
default: oosmos_FOREVER();
}
}

static void RunReceiverStateMachine(void * pObject)
{
uart * pUART = (uart *) pObject;
uint8_t Byte;

DisableInterrupt(pUART);
const bool PopSuccess = oosmos_QueuePop(&pUART->m_ReceiveDataQueue, &Byte, sizeof(Byte));
EnableInterrupt(pUART);

if (PopSuccess) {
uart_sReceivedByteEvent ReceivedByteEvent = { oosmos_EMPTY_EVENT, Byte };
oosmos_SubscriberListNotifyWithArgs(pUART->m_ReceivedByteEventSubscribers, ReceivedByteEvent);
}
}

static void RunSenderStateMachine(void * pObject)
{
uart * pUART = (uart *) pObject;

switch (pUART->m_SendState) {
case sendAwaitingCharToSend_State: {
const bool PopSuccess = oosmos_QueuePop(&pUART->m_SendDataQueue, &pUART->m_CharToSend, sizeof(pUART->m_CharToSend));

if (PopSuccess)
pUART->m_SendState = sendAwaitingReady_State;

break;
}
case sendAwaitingReady_State: {
if (UARTTransmitterIsReady(pUART->m_PlibUartID)) {
UARTSendDataByte(pUART->m_PlibUartID, pUART->m_CharToSend);
pUART->m_SendState = sendAwaitingComplete_State;
}

break;
}
case sendAwaitingComplete_State: {
if (UARTTransmissionHasCompleted(pUART->m_PlibUartID))
pUART->m_SendState = sendAwaitingCharToSend_State;

break;
}
}
}

static void RunStateMachine(void * pObject)
{
RunSenderStateMachine(pObject);
RunReceiverStateMachine(pObject);
}

static void ISR(const unsigned UartModule)
{
uart * pUART = UartList;

for (unsigned Count = 1; Count <= UartCount; pUART++, Count++) {
if (UartModule <= pUART->m_UartModule) {
break;
}
}

const unsigned PlibUartId = pUART->m_PlibUartID;

if (INTGetFlag(INT_SOURCE_UART_RX(PlibUartId))) {
while (UARTReceivedDataIsAvailable(PlibUartId)) {
const uint8_t Byte = UARTGetDataByte(PlibUartId);
oosmos_QueuePush(&pUART->m_ReceiveDataQueue, &Byte, sizeof(Byte));
}

INTClearFlag(INT_SOURCE_UART_RX(PlibUartId));
}
}
	[...]
static uint32_t GetPeripheralClock(void)
{
return (oosmos_GetClockSpeedInMHz()*1000000) / (1 << OSCCONbits.PBDIV);
}

extern void uartPrintf(uart * pUART, const char * pFormat, ...)
{
char Buffer[100];
va_list ArgList;

va_start(ArgList, pFormat);
vsprintf(Buffer, pFormat, ArgList);
uartSendString(pUART, Buffer);
}

extern void uartSendChar(uart * pUART, const char Char)
{
oosmos_QueuePush(&pUART->m_SendDataQueue, &Char, sizeof(Char));
}
	[...]
extern void uartSendString(uart * pUART, const char * pString)
{
uint8_t Char;

while (Char = *pString++, Char) {
uartSendChar(pUART, Char);
}
}

extern void uartStart(uart * pUART)
{
const unsigned PlibUartId = pUART->m_PlibUartID;

UARTEnable(PlibUartId, UART_ENABLE_FLAGS(UART_PERIPHERAL \| UART_RX \| UART_TX));
EnableInterrupt(pUART);
}

//
// 'UartModule' is 1, 2, etc.
//
extern uart * uartNew(const unsigned UartModule, const unsigned BaudRate)
{
oosmos_AllocateVisible(pUART, uart, UartList, UartCount, MaxUARTS, NULL);

pUART->m_UartModule = UartModule;

const unsigned PlibUartID = UartIndex_to_PlibUartId[UartModule-1];
pUART->m_PlibUartID = PlibUartID;

UARTConfigure(PlibUartID, UART_ENABLE_PINS_TX_RX_ONLY);
UARTSetFifoMode(PlibUartID, UART_INTERRUPT_ON_TX_NOT_FULL \| UART_INTERRUPT_ON_RX_NOT_EMPTY);
UARTSetLineControl(PlibUartID, UART_DATA_SIZE_8_BITS \| UART_PARITY_NONE \| UART_STOP_BITS_1);
UARTSetDataRate(PlibUartID, GetPeripheralClock(), BaudRate);

const unsigned Priority = 1;
INTSetVectorPriority(INT_VECTOR_UART(PlibUartID), GetPriorityBits(Priority));
INTSetVectorSubPriority(INT_VECTOR_UART(PlibUartID), INT_SUB_PRIORITY_LEVEL_0);

oosmos_QueueConstruct(&pUART->m_SendDataQueue, pUART->m_SendDataQueueData, sizeof(pUART->m_SendDataQueueData), sizeof(uint8_t));

oosmos_QueueConstruct(&pUART->m_ReceiveDataQueue, pUART->m_ReceiveDataQueueData, sizeof(pUART->m_ReceiveDataQueueData), sizeof(uint8_t));
oosmos_SubscriberListInit(pUART->m_ReceivedByteEventSubscribers);

oosmos_ActiveObjectInit(pUART, m_ActiveObject, RunStateMachine);

return pUART;
}

extern void uartSubscribe(uart * pUART, oosmos_sQueue * pQueue, const int EventCode, void * pContext)
{
oosmos_SubscriberListAdd(pUART->m_ReceivedByteEventSubscribers, pQueue, EventCode, pContext);
}

#define uartVector(N) void __ISR(_UART_##N##_VECTOR) IntUart##N##Handler() { ISR(N); }

#ifdef _UART1
uartVector(1)
#endif

#ifdef _UART2
uartVector(2)
#endif

#ifdef _UART3
uartVector(3)
#endif

#ifdef _UART4
uartVector(4)
#endif

#ifdef _UART5
uartVector(5)
#endif

#ifdef _UART6
uartVector(6)
#endif

oosmos/Classes/PIC32/uart.c

Allows you to specify a function to call when the specified queue is full.
If no function is set, the new element is tossed (oosmos_QueueFull_TossNew).

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void oosmos_QueueSetBehaviorFunc(oosmos_sQueue * pQueue, oosmos_eQueueFullBehavior (pCallback)(void ), void * pContext);

Prototype

pQueue

Pointer to a oosmos_sQueue item that holds the metadata for the queue.

pCallback

Address of function to call when the specified queue is full. In this function, you can report the issue or attempt to recover from it. Your function can return one of two values to instruct OOSMOS what to do:

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typedef enum {
oosmos_QueueFull_TossNew = 1,
oosmos_QueueFull_TossOld
} oosmos_eQueueFullBehavior;

Prototype

pContext

A pointer to caller context information that will be passed to the callback function. Can be NULL.

See Also

QueueConstruct, QueuePop, QueuePush, sQueue

oosmos_RunStateMachine runs a single OOSMOS state machine object one time. See example on line 207 in the code snippet.

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void oosmos_RunStateMachine(pObject);

Prototype

pObject	The address of the object that contains the state machine.
See Also	`RunStateMachines`

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//	[MIT]
// OOSMOS motion Example
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#include "oosmos.h"	[...]
#include <stdbool.h>
#include <stdio.h>

//>>>EVENTS
enum {
evDownCommand = 1,
evLowerLimitSwitchClosed = 2,
evLowerLimitSwitchOpen = 3,
evStopCommand = 4,
evUpCommand = 5,
evUpperLimitSwitchClosed = 6,
evUpperLimitSwitchOpen = 7
};

#ifdef oosmos_DEBUG
static const char * OOSMOS_EventNames(int EventCode)
{
switch (EventCode) {
case evDownCommand: return "evDownCommand";
case evLowerLimitSwitchClosed: return "evLowerLimitSwitchClosed";
case evLowerLimitSwitchOpen: return "evLowerLimitSwitchOpen";
case evStopCommand: return "evStopCommand";
case evUpCommand: return "evUpCommand";
case evUpperLimitSwitchClosed: return "evUpperLimitSwitchClosed";
case evUpperLimitSwitchOpen: return "evUpperLimitSwitchOpen";
default: return "";
}
}
#endif
//<<<EVENTS

typedef struct motionTag motion;

typedef union {
oosmos_sEvent Base;
} uEvents;

struct motionTag
{
//>>>DECL
oosmos_sStateMachine(ROOT, uEvents, 3);
oosmos_sOrtho Active_State;
oosmos_sOrthoRegion Active_Region1_State;
oosmos_sComposite Active_Region1_Limits_State;
oosmos_sLeaf Active_Region1_Limits_AtUpperLimit_State;
oosmos_sLeaf Active_Region1_Limits_InBounds_State;
oosmos_sChoice Active_Region1_Limits_Choice1_State;
oosmos_sLeaf Active_Region1_Limits_AtLowerLimit_State;
oosmos_sOrthoRegion Active_Region2_State;
oosmos_sLeaf Active_Region2_Stopped_State;
oosmos_sComposite Active_Region2_Moving_State;
oosmos_sLeaf Active_Region2_Moving_Up_State;
oosmos_sLeaf Active_Region2_Moving_Down_State;
//<<<DECL
};

static int Failures = 0;

static bool IsUpperLimitSwitchOpen(void) {
return true;
}

static bool IsLowerLimitSwitchOpen(void) {
return false;
}

//>>>CODE
static bool Active_Region1_Limits_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
motion * pMotion = (motion *) pObject;

switch (oosmos_EventCode(pEvent)) {
case evUpperLimitSwitchOpen: {
return oosmos_Transition(pMotion, pState, Active_Region1_Limits_AtUpperLimit_State);
}
case evUpperLimitSwitchClosed: {
return oosmos_Transition(pMotion, pState, Active_Region1_Limits_InBounds_State);
}
case evLowerLimitSwitchClosed: {
return oosmos_Transition(pMotion, pState, Active_Region1_Limits_InBounds_State);
}
case evLowerLimitSwitchOpen: {
return oosmos_Transition(pMotion, pState, Active_Region1_Limits_AtLowerLimit_State);
}
}

return false;
}

static bool Active_Region1_Limits_Choice1_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
motion * pMotion = (motion *) pObject;

if (oosmos_EventCode(pEvent) == oosmos_ENTER) {
if (IsUpperLimitSwitchOpen()) {
return oosmos_Transition(pMotion, pState, Active_Region1_Limits_AtUpperLimit_State);
}
else if (IsLowerLimitSwitchOpen()) {
return oosmos_Transition(pMotion, pState, Active_Region1_Limits_AtLowerLimit_State);
}
else {
return oosmos_Transition(pMotion, pState, Active_Region1_Limits_InBounds_State);
}
}

return false;
}

static bool Active_Region2_Stopped_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
motion * pMotion = (motion *) pObject;

switch (oosmos_EventCode(pEvent)) {
case evUpCommand: {
return oosmos_Transition(pMotion, pState, Active_Region2_Moving_Up_State);
}
case evDownCommand: {
return oosmos_Transition(pMotion, pState, Active_Region2_Moving_Down_State);
}
}

return false;
}

static bool Active_Region2_Moving_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
motion * pMotion = (motion *) pObject;

switch (oosmos_EventCode(pEvent)) {
case evStopCommand: {
return oosmos_Transition(pMotion, pState, Active_Region2_Stopped_State);
}
}

return false;
}

static bool Active_Region2_Moving_Up_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
motion * pMotion = (motion *) pObject;

switch (oosmos_EventCode(pEvent)) {
case evDownCommand: {
return oosmos_Transition(pMotion, pState, Active_Region2_Moving_Down_State);
}
case evUpperLimitSwitchOpen: {
return oosmos_Transition(pMotion, pState, Active_Region2_Stopped_State);
}
}

return false;
}

static bool Active_Region2_Moving_Down_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
motion * pMotion = (motion *) pObject;

switch (oosmos_EventCode(pEvent)) {
case evUpCommand: {
return oosmos_Transition(pMotion, pState, Active_Region2_Moving_Up_State);
}
case evLowerLimitSwitchOpen: {
return oosmos_Transition(pMotion, pState, Active_Region2_Stopped_State);
}
}

return false;
}
//<<<CODE

static motion * motionNew(void)
{
oosmos_Allocate(pMotion, motion, 2, NULL);

//>>>INIT
oosmos_StateMachineInit(pMotion, ROOT, NULL, Active_State);
oosmos_OrthoInit(pMotion, Active_State, ROOT, NULL);
oosmos_OrthoRegionInit(pMotion, Active_Region1_State, Active_State, Active_Region1_Limits_State, NULL);
oosmos_CompositeInit(pMotion, Active_Region1_Limits_State, Active_Region1_State, Active_Region1_Limits_Choice1_State, Active_Region1_Limits_State_Code);
oosmos_LeafInit(pMotion, Active_Region1_Limits_AtUpperLimit_State, Active_Region1_Limits_State, NULL);
oosmos_LeafInit(pMotion, Active_Region1_Limits_InBounds_State, Active_Region1_Limits_State, NULL);
oosmos_ChoiceInit(pMotion, Active_Region1_Limits_Choice1_State, Active_Region1_Limits_State, Active_Region1_Limits_Choice1_State_Code);
oosmos_LeafInit(pMotion, Active_Region1_Limits_AtLowerLimit_State, Active_Region1_Limits_State, NULL);
oosmos_OrthoRegionInit(pMotion, Active_Region2_State, Active_State, Active_Region2_Stopped_State, NULL);
oosmos_LeafInit(pMotion, Active_Region2_Stopped_State, Active_Region2_State, Active_Region2_Stopped_State_Code);
oosmos_CompositeInit(pMotion, Active_Region2_Moving_State, Active_Region2_State, Active_Region2_Moving_Up_State, Active_Region2_Moving_State_Code);
oosmos_LeafInit(pMotion, Active_Region2_Moving_Up_State, Active_Region2_Moving_State, Active_Region2_Moving_Up_State_Code);
oosmos_LeafInit(pMotion, Active_Region2_Moving_Down_State, Active_Region2_Moving_State, Active_Region2_Moving_Down_State_Code);

oosmos_Debug(pMotion, OOSMOS_EventNames);
//<<<INIT

return pMotion;
}

static void QueueEvent(motion * pMotion, int EventCode)
{
oosmos_PushEventCode(pMotion, EventCode);
oosmos_RunStateMachine(pMotion);
}

static void TestState(const motion * pMotion, const void * pState)	[...]
{
if (!oosmos_IsInState(pMotion, pState)) {
printf("FAILURE.\n");
Failures += 1;
}
}

extern int main(void)
{
motion * pMotion = motionNew();

QueueEvent(pMotion, evUpCommand);
TestState(pMotion, &pMotion->Active_Region2_Moving_Up_State);

QueueEvent(pMotion, evUpperLimitSwitchOpen);
TestState(pMotion, &pMotion->Active_Region2_Stopped_State);
TestState(pMotion, &pMotion->Active_Region1_Limits_AtUpperLimit_State);

QueueEvent(pMotion, evDownCommand);
TestState(pMotion, &pMotion->Active_Region2_Moving_Down_State);

QueueEvent(pMotion, evLowerLimitSwitchClosed);
TestState(pMotion, &pMotion->Active_Region1_Limits_InBounds_State);

QueueEvent(pMotion, evUpCommand);
TestState(pMotion, &pMotion->Active_Region2_Moving_Up_State);

QueueEvent(pMotion, evStopCommand);
TestState(pMotion, &pMotion->Active_Region2_Stopped_State);

if (Failures > 0) {
printf("%d FAILURES\n", Failures);
}
else {
printf("\n");
printf("SUCCESS!\n");
}

return 0;
}

oosmos/Examples/Ortho/Windows/Motion.c

oosmos_RunStateMachines runs all OOSMOS state machine objects as well as all registered Active Objects (see oosmos_ActiveObjectInit.)
See line 27 in the code snippet below for an example.

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void oosmos_RunStateMachines(void);

Prototype

See Also

ActiveObjectInit, RunStateMachine, StateMachineDetach, StateMachineInit, StateMachineInitNoQueue

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//	[MIT]
// OOSMOS Blink Example
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#include "oosmos.h"
#include "pin.h"
#include "toggle.h"

static void SetupToggle(int Pin, int OnTimeMS, int OffTimeMS)
{
pin * pPin = pinNew(Pin, pinOut, pinActiveHigh);
toggleNew(pPin, OnTimeMS, OffTimeMS);
}

extern void setup()
{
SetupToggle(13, 50, 500);
SetupToggle(12, 2000, 2000);
SetupToggle(11, 50, 1500);
}

extern void loop()
{
oosmos_RunStateMachines();
}

oosmos/Examples/Blink/Arduino/BlinkExample/BlinkExample.ino

See oosmos_ActiveObjectInit.

oosmos_sChoice declares a choice pseudostate in an OOSMOS state machine object.

See Also

ChoiceInit

oosmos_sComposite declares a composite state in an OOSMOS state machine object.
See line 21 in the code snippet below for an example.

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//	[MIT]
// OOSMOS Final Example
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#include "oosmos.h"	[...]
#include <stdbool.h>
#include <stdio.h>

//<<<EVENTS
//>>>EVENTS

typedef struct testTag test;

struct testTag
{
//>>>DECL
oosmos_sStateMachineNoQueue(ROOT);
oosmos_sComposite A_State;
oosmos_sChoice A_Choice1_State;
oosmos_sLeaf A_Left_State;
oosmos_sLeaf A_Right_State;
oosmos_sFinal A_Final1_State;
oosmos_sLeaf B_State;
//<<<DECL
};

static bool IsLeft(void)	[...]
{
return true;
}

static void Default(void)
{
printf("In Default\n");
}

//>>>CODE
static bool A_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_DEFAULT: {
Default();
return true;
}
case oosmos_COMPLETE: {
return oosmos_Transition(pTest, pState, B_State);
}
}

return false;
}

static bool A_Choice1_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

if (oosmos_EventCode(pEvent) == oosmos_ENTER) {
if (IsLeft()) {
return oosmos_Transition(pTest, pState, A_Left_State);
}
else {
return oosmos_Transition(pTest, pState, A_Right_State);
}
}

return false;
}

static bool A_Left_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_COMPLETE: {
return oosmos_Transition(pTest, pState, A_Final1_State);
}
}

return false;
}

static bool A_Right_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_COMPLETE: {
return oosmos_Transition(pTest, pState, A_Final1_State);
}
}

return false;
}
//<<<CODE

static test * testNew(void)
{
oosmos_Allocate(pTest, test, 1, NULL);

//>>>INIT
oosmos_StateMachineInitNoQueue(pTest, ROOT, NULL, A_State);
oosmos_CompositeInit(pTest, A_State, ROOT, A_Choice1_State, A_State_Code);
oosmos_ChoiceInit(pTest, A_Choice1_State, A_State, A_Choice1_State_Code);
oosmos_LeafInit(pTest, A_Left_State, A_State, A_Left_State_Code);
oosmos_LeafInit(pTest, A_Right_State, A_State, A_Right_State_Code);
oosmos_FinalInit(pTest, A_Final1_State, A_State, NULL);
oosmos_LeafInit(pTest, B_State, ROOT, NULL);

oosmos_Debug(pTest, NULL);
//<<<INIT

return pTest;
}

extern int main(void)
{
test * pTest = testNew();

for (;;) {
oosmos_RunStateMachines();

if (oosmos_IsInState(pTest, &pTest->B_State)) {
printf("SUCCESS.\n");
break;
}

oosmos_DelayMS(1);
}
}

oosmos/Examples/Basic/Windows/Final.c

oosmos_Seconds2Days_Rounded is a macro that converts seconds to days with the result being rounded for better precision. If speed is more important than accuracy, see the truncated version of this macro.

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oosmos_Seconds2Days_Rounded(Seconds)

Macro

See Also

Days2Hours, Days2MS, Days2Minutes, Days2Seconds, Days2US, Divide_Integral_Rounded, Hours2Days_Rounded, Hours2Days_Truncated, Hours2MS, Hours2Minutes, Hours2Seconds, Hours2US, MS2Days_Rounded, MS2Days_Truncated, MS2Hours_Rounded, MS2Hours_Truncated, MS2Minutes_Rounded, MS2Minutes_Truncated, MS2Seconds_Rounded, MS2Seconds_Truncated, MS2US, Minutes2Days_Rounded, Minutes2Days_Truncated, Minutes2Hours_Rounded, Minutes2Hours_Truncated, Minutes2MS, Minutes2Seconds, Minutes2US, Seconds2Days_Truncated, Seconds2Hours_Rounded, Seconds2Hours_Truncated, Seconds2MS, Seconds2Minutes_Rounded, Seconds2Minutes_Truncated, Seconds2US, US2Days_Rounded, US2Days_Truncated, US2Hours_Rounded, US2Hours_Truncated, US2MS_Rounded, US2MS_Truncated, US2Minutes_Rounded, US2Minutes_Truncated, US2Seconds_Rounded, US2Seconds_Truncated

oosmos_Seconds2Days_Truncated is a macro that converts seconds to days with the result being truncated due to default integral division behavior. If precision is important, see the rounded version of this macro.

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oosmos_Seconds2Days_Truncated(Seconds)

Macro

See Also

Days2Hours, Days2MS, Days2Minutes, Days2Seconds, Days2US, Divide_Integral_Rounded, Hours2Days_Rounded, Hours2Days_Truncated, Hours2MS, Hours2Minutes, Hours2Seconds, Hours2US, MS2Days_Rounded, MS2Days_Truncated, MS2Hours_Rounded, MS2Hours_Truncated, MS2Minutes_Rounded, MS2Minutes_Truncated, MS2Seconds_Rounded, MS2Seconds_Truncated, MS2US, Minutes2Days_Rounded, Minutes2Days_Truncated, Minutes2Hours_Rounded, Minutes2Hours_Truncated, Minutes2MS, Minutes2Seconds, Minutes2US, Seconds2Days_Rounded, Seconds2Hours_Rounded, Seconds2Hours_Truncated, Seconds2MS, Seconds2Minutes_Rounded, Seconds2Minutes_Truncated, Seconds2US, US2Days_Rounded, US2Days_Truncated, US2Hours_Rounded, US2Hours_Truncated, US2MS_Rounded, US2MS_Truncated, US2Minutes_Rounded, US2Minutes_Truncated, US2Seconds_Rounded, US2Seconds_Truncated

oosmos_Seconds2Hours_Rounded is a macro that converts seconds to hours with the result being rounded for better precision. If speed is more important than accuracy, see the truncated version of this macro.

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oosmos_Seconds2Hours_Rounded(Seconds)

Macro

See Also

Days2Hours, Days2MS, Days2Minutes, Days2Seconds, Days2US, Divide_Integral_Rounded, Hours2Days_Rounded, Hours2Days_Truncated, Hours2MS, Hours2Minutes, Hours2Seconds, Hours2US, MS2Days_Rounded, MS2Days_Truncated, MS2Hours_Rounded, MS2Hours_Truncated, MS2Minutes_Rounded, MS2Minutes_Truncated, MS2Seconds_Rounded, MS2Seconds_Truncated, MS2US, Minutes2Days_Rounded, Minutes2Days_Truncated, Minutes2Hours_Rounded, Minutes2Hours_Truncated, Minutes2MS, Minutes2Seconds, Minutes2US, Seconds2Days_Rounded, Seconds2Days_Truncated, Seconds2Hours_Truncated, Seconds2MS, Seconds2Minutes_Rounded, Seconds2Minutes_Truncated, Seconds2US, US2Days_Rounded, US2Days_Truncated, US2Hours_Rounded, US2Hours_Truncated, US2MS_Rounded, US2MS_Truncated, US2Minutes_Rounded, US2Minutes_Truncated, US2Seconds_Rounded, US2Seconds_Truncated

oosmos_Seconds2Hours_Truncated is a macro that converts seconds to hours with the result being truncated due to default integral division behavior. If precision is important, see the rounded version of this macro.

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oosmos_Seconds2Hours_Truncated(Seconds)

Macro

See Also

Days2Hours, Days2MS, Days2Minutes, Days2Seconds, Days2US, Divide_Integral_Rounded, Hours2Days_Rounded, Hours2Days_Truncated, Hours2MS, Hours2Minutes, Hours2Seconds, Hours2US, MS2Days_Rounded, MS2Days_Truncated, MS2Hours_Rounded, MS2Hours_Truncated, MS2Minutes_Rounded, MS2Minutes_Truncated, MS2Seconds_Rounded, MS2Seconds_Truncated, MS2US, Minutes2Days_Rounded, Minutes2Days_Truncated, Minutes2Hours_Rounded, Minutes2Hours_Truncated, Minutes2MS, Minutes2Seconds, Minutes2US, Seconds2Days_Rounded, Seconds2Days_Truncated, Seconds2Hours_Rounded, Seconds2MS, Seconds2Minutes_Rounded, Seconds2Minutes_Truncated, Seconds2US, US2Days_Rounded, US2Days_Truncated, US2Hours_Rounded, US2Hours_Truncated, US2MS_Rounded, US2MS_Truncated, US2Minutes_Rounded, US2Minutes_Truncated, US2Seconds_Rounded, US2Seconds_Truncated

oosmos_Seconds2Minutes_Rounded is a macro that converts seconds to minutes with the result being rounded for better precision. If speed is more important than accuracy, see the truncated version of this macro.

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oosmos_Seconds2Minutes_Rounded(Seconds)

Macro

See Also

Days2Hours, Days2MS, Days2Minutes, Days2Seconds, Days2US, Divide_Integral_Rounded, Hours2Days_Rounded, Hours2Days_Truncated, Hours2MS, Hours2Minutes, Hours2Seconds, Hours2US, MS2Days_Rounded, MS2Days_Truncated, MS2Hours_Rounded, MS2Hours_Truncated, MS2Minutes_Rounded, MS2Minutes_Truncated, MS2Seconds_Rounded, MS2Seconds_Truncated, MS2US, Minutes2Days_Rounded, Minutes2Days_Truncated, Minutes2Hours_Rounded, Minutes2Hours_Truncated, Minutes2MS, Minutes2Seconds, Minutes2US, Seconds2Days_Rounded, Seconds2Days_Truncated, Seconds2Hours_Rounded, Seconds2Hours_Truncated, Seconds2MS, Seconds2Minutes_Truncated, Seconds2US, US2Days_Rounded, US2Days_Truncated, US2Hours_Rounded, US2Hours_Truncated, US2MS_Rounded, US2MS_Truncated, US2Minutes_Rounded, US2Minutes_Truncated, US2Seconds_Rounded, US2Seconds_Truncated

oosmos_Seconds2Minutes_Truncated is a macro that converts seconds to minutes with the result being truncated due to default integral division behavior. If precision is important, see the rounded version of this macro.

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oosmos_Seconds2Minutes_Truncated(Seconds)

Macro

See Also

Days2Hours, Days2MS, Days2Minutes, Days2Seconds, Days2US, Divide_Integral_Rounded, Hours2Days_Rounded, Hours2Days_Truncated, Hours2MS, Hours2Minutes, Hours2Seconds, Hours2US, MS2Days_Rounded, MS2Days_Truncated, MS2Hours_Rounded, MS2Hours_Truncated, MS2Minutes_Rounded, MS2Minutes_Truncated, MS2Seconds_Rounded, MS2Seconds_Truncated, MS2US, Minutes2Days_Rounded, Minutes2Days_Truncated, Minutes2Hours_Rounded, Minutes2Hours_Truncated, Minutes2MS, Minutes2Seconds, Minutes2US, Seconds2Days_Rounded, Seconds2Days_Truncated, Seconds2Hours_Rounded, Seconds2Hours_Truncated, Seconds2MS, Seconds2Minutes_Rounded, Seconds2US, US2Days_Rounded, US2Days_Truncated, US2Hours_Rounded, US2Hours_Truncated, US2MS_Rounded, US2MS_Truncated, US2Minutes_Rounded, US2Minutes_Truncated, US2Seconds_Rounded, US2Seconds_Truncated

oosmos_Seconds2MS is a macro that converts seconds to milliseconds.

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oosmos_Seconds2MS(Seconds)

Macro

See Also

Days2Hours, Days2MS, Days2Minutes, Days2Seconds, Days2US, Divide_Integral_Rounded, Hours2Days_Rounded, Hours2Days_Truncated, Hours2MS, Hours2Minutes, Hours2Seconds, Hours2US, MS2Days_Rounded, MS2Days_Truncated, MS2Hours_Rounded, MS2Hours_Truncated, MS2Minutes_Rounded, MS2Minutes_Truncated, MS2Seconds_Rounded, MS2Seconds_Truncated, MS2US, Minutes2Days_Rounded, Minutes2Days_Truncated, Minutes2Hours_Rounded, Minutes2Hours_Truncated, Minutes2MS, Minutes2Seconds, Minutes2US, Seconds2Days_Rounded, Seconds2Days_Truncated, Seconds2Hours_Rounded, Seconds2Hours_Truncated, Seconds2Minutes_Rounded, Seconds2Minutes_Truncated, Seconds2US, US2Days_Rounded, US2Days_Truncated, US2Hours_Rounded, US2Hours_Truncated, US2MS_Rounded, US2MS_Truncated, US2Minutes_Rounded, US2Minutes_Truncated, US2Seconds_Rounded, US2Seconds_Truncated

oosmos_Seconds2US is a macro that converts seconds to microseconds.

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oosmos_Seconds2US(Seconds)

Macro

See Also

Days2Hours, Days2MS, Days2Minutes, Days2Seconds, Days2US, Divide_Integral_Rounded, Hours2Days_Rounded, Hours2Days_Truncated, Hours2MS, Hours2Minutes, Hours2Seconds, Hours2US, MS2Days_Rounded, MS2Days_Truncated, MS2Hours_Rounded, MS2Hours_Truncated, MS2Minutes_Rounded, MS2Minutes_Truncated, MS2Seconds_Rounded, MS2Seconds_Truncated, MS2US, Minutes2Days_Rounded, Minutes2Days_Truncated, Minutes2Hours_Rounded, Minutes2Hours_Truncated, Minutes2MS, Minutes2Seconds, Minutes2US, Seconds2Days_Rounded, Seconds2Days_Truncated, Seconds2Hours_Rounded, Seconds2Hours_Truncated, Seconds2MS, Seconds2Minutes_Rounded, Seconds2Minutes_Truncated, US2Days_Rounded, US2Days_Truncated, US2Hours_Rounded, US2Hours_Truncated, US2MS_Rounded, US2MS_Truncated, US2Minutes_Rounded, US2Minutes_Truncated, US2Seconds_Rounded, US2Seconds_Truncated

oosmos_sEvent is the principal event structure. It holds an event code called Code and a context pointer called pContext.
See line 32 for an example of use.

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typedef struct
{
int m_Code;
void * m_pContext;
} oosmos_sEvent;

oosmos_sEvent Data Type

Code	Member `m_Code` holds the event code to be delivered.
pContext	Member `m_pContext` is a user-defined pointer to help the notified entity determine the context of the action.
See Also	`EMPTY_EVENT`, `EventCode`, `GetCurrentEvent`, `SubscriberListAdd`, `SubscriberListInit`, `SubscriberListNotify`, `SubscriberListNotifyWithArgs`

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//	[MIT]
// OOSMOS - EventDemo example, motor object
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#include "oosmos.h"	[...]
#include "motor.h"
#include <stdbool.h>
#include <stdio.h>

//>>>EVENTS
enum {	[Code Generated by OOSMOS]
evStart = 1,
evStop = 2
};

#ifdef oosmos_DEBUG
static const char * OOSMOS_EventNames(int EventCode)
{
switch (EventCode) {
case evStart: return "evStart";
case evStop: return "evStop";
default: return "";
}
}
#endif
//<<<EVENTS

typedef union {
oosmos_sEvent Event;
} uEvents;

struct motorTag
{
//>>>DECL
oosmos_sStateMachine(ROOT, uEvents, 3);	[Code Generated by OOSMOS]
oosmos_sLeaf Idle_State;
oosmos_sLeaf Moving_State;
//<<<DECL
};

#ifndef motorMAX
#define motorMAX 3
#endif

static void MovingThread(oosmos_sState * pState)
{
oosmos_ThreadBegin();
for (;;) {
printf("motor: MOVING...\n");
oosmos_ThreadDelayMS(500);
}
oosmos_ThreadEnd();
}

//>>>CODE
static bool Idle_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)	[Code Generated by OOSMOS]
{
motor * pMotor = (motor *) pObject;

switch (oosmos_EventCode(pEvent)) {
case evStart: {
return oosmos_Transition(pMotor, pState, Moving_State);
}
}

return false;
}

static bool Moving_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
motor * pMotor = (motor *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_POLL: {
MovingThread(pState);
return true;
}
case evStop: {
return oosmos_Transition(pMotor, pState, Idle_State);
}
}

return false;
}
//<<<CODE

extern motor * motorNew(void)
{
oosmos_Allocate(pMotor, motor, motorMAX, NULL);

//>>>INIT
oosmos_StateMachineInit(pMotor, ROOT, NULL, Idle_State);	[Code Generated by OOSMOS]
oosmos_LeafInit(pMotor, Idle_State, ROOT, Idle_State_Code);
oosmos_LeafInit(pMotor, Moving_State, ROOT, Moving_State_Code);

oosmos_Debug(pMotor, OOSMOS_EventNames);
//<<<INIT

return pMotor;
}

extern void motorOn(const motor * pMotor)	[...]
{
oosmos_PushEventCode(pMotor, evStart);
}

extern void motorOff(const motor * pMotor)
{
oosmos_PushEventCode(pMotor, evStop);
}

oosmos/Examples/EventDemo/Windows/motor.c

oosmos_sFinal declares a final state in your OOSMOS state machine object.
See line 25 in the code snippet for an example.

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//	[MIT]
// OOSMOS Final Example
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#include "oosmos.h"	[...]
#include <stdbool.h>
#include <stdio.h>

//<<<EVENTS
//>>>EVENTS

typedef struct testTag test;

struct testTag
{
//>>>DECL
oosmos_sStateMachineNoQueue(ROOT);
oosmos_sComposite A_State;
oosmos_sChoice A_Choice1_State;
oosmos_sLeaf A_Left_State;
oosmos_sLeaf A_Right_State;
oosmos_sFinal A_Final1_State;
oosmos_sLeaf B_State;
//<<<DECL
};

static bool IsLeft(void)	[...]
{
return true;
}

static void Default(void)
{
printf("In Default\n");
}

//>>>CODE
static bool A_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_DEFAULT: {
Default();
return true;
}
case oosmos_COMPLETE: {
return oosmos_Transition(pTest, pState, B_State);
}
}

return false;
}

static bool A_Choice1_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

if (oosmos_EventCode(pEvent) == oosmos_ENTER) {
if (IsLeft()) {
return oosmos_Transition(pTest, pState, A_Left_State);
}
else {
return oosmos_Transition(pTest, pState, A_Right_State);
}
}

return false;
}

static bool A_Left_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_COMPLETE: {
return oosmos_Transition(pTest, pState, A_Final1_State);
}
}

return false;
}

static bool A_Right_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_COMPLETE: {
return oosmos_Transition(pTest, pState, A_Final1_State);
}
}

return false;
}
//<<<CODE

static test * testNew(void)
{
oosmos_Allocate(pTest, test, 1, NULL);

//>>>INIT
oosmos_StateMachineInitNoQueue(pTest, ROOT, NULL, A_State);
oosmos_CompositeInit(pTest, A_State, ROOT, A_Choice1_State, A_State_Code);
oosmos_ChoiceInit(pTest, A_Choice1_State, A_State, A_Choice1_State_Code);
oosmos_LeafInit(pTest, A_Left_State, A_State, A_Left_State_Code);
oosmos_LeafInit(pTest, A_Right_State, A_State, A_Right_State_Code);
oosmos_FinalInit(pTest, A_Final1_State, A_State, NULL);
oosmos_LeafInit(pTest, B_State, ROOT, NULL);

oosmos_Debug(pTest, NULL);
//<<<INIT

return pTest;
}

extern int main(void)
{
test * pTest = testNew();

for (;;) {
oosmos_RunStateMachines();

if (oosmos_IsInState(pTest, &pTest->B_State)) {
printf("SUCCESS.\n");
break;
}

oosmos_DelayMS(1);
}
}

oosmos/Examples/Basic/Windows/Final.c

oosmos_sHistory declares a history pseudostate (shallow or deep) in an OOSMOS state machine object.

See Also

HistoryInit

oosmos_sLeaf declares a leaf state in an OOSMOS state machine object.
See line 23 in the code snippet below for an example.

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//	[MIT]
// OOSMOS toggle Class
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#include "oosmos.h"	[...]
#include "toggle.h"
#include "pin.h"
#include <stdbool.h>
#include <stdint.h>
#include <stddef.h>

#ifndef toggleMAX
#define toggleMAX 4
#endif

struct toggleTag
{
//>>>DECL
oosmos_sStateMachineNoQueue(ROOT);
oosmos_sLeaf Off_State;
oosmos_sLeaf On_State;
//<<<DECL

pin * m_pPin;
uint32_t m_TimeOnMS;
uint32_t m_TimeOffMS;
};

//>>>CODE	[...]
static bool Off_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
toggle * pToggle = (toggle *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_ENTER: {
return oosmos_StateTimeoutMS(pState, (uint32_t) pToggle->m_TimeOffMS);
}
case oosmos_TIMEOUT: {
return oosmos_Transition(pToggle, pState, On_State);
}
}

return false;
}

static bool On_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
toggle * pToggle = (toggle *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_ENTER: {
pinOn(pToggle->m_pPin);
return oosmos_StateTimeoutMS(pState, (uint32_t) pToggle->m_TimeOnMS);
}
case oosmos_EXIT: {
pinOff(pToggle->m_pPin);
return true;
}
case oosmos_TIMEOUT: {
return oosmos_Transition(pToggle, pState, Off_State);
}
}

return false;
}
//<<<CODE

extern toggle * toggleNew(pin * pPin, uint32_t TimeOnMS, uint32_t TimeOffMS)
{
oosmos_Allocate(pToggle, toggle, toggleMAX, NULL);

//>>>INIT
oosmos_StateMachineInitNoQueue(pToggle, ROOT, NULL, On_State);
oosmos_LeafInit(pToggle, Off_State, ROOT, Off_State_Code);
oosmos_LeafInit(pToggle, On_State, ROOT, On_State_Code);
//<<<INIT

pToggle->m_pPin = pPin;
pToggle->m_TimeOnMS = TimeOnMS;
pToggle->m_TimeOffMS = TimeOffMS;

return pToggle;
}

oosmos/Classes/toggle_state.c

Type that declares an Object Thread inside an OOSMOS object. See line 23 for an example of the declaration and line 50 for an example of its creation. See lines 30-44 for the thread itself.

See Also

ObjectThreadInit, ObjectThreadRestart, ObjectThreadStart, ObjectThreadStop

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//	[MIT]
// OOSMOS toggle Class
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#ifndef toggleMAX
#define toggleMAX 5
#endif

//===================================

#include "oosmos.h"
#include "pin.h"
#include "toggle.h"
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>

struct toggleTag
{
oosmos_sObjectThread m_ObjectThread;

pin * m_pPin;
uint32_t m_TimeOnMS;
uint32_t m_TimeOffMS;
};

static void ToggleThread(const toggle * pToggle, oosmos_sState * pState)
{
oosmos_POINTER_GUARD(pToggle);
oosmos_POINTER_GUARD(pState);

oosmos_ThreadBegin();
for (;;) {
pinOn(pToggle->m_pPin);
oosmos_ThreadDelayMS(pToggle->m_TimeOnMS);

pinOff(pToggle->m_pPin);
oosmos_ThreadDelayMS(pToggle->m_TimeOffMS);
}
oosmos_ThreadEnd();
}

extern toggle * toggleNew(pin * pPin, uint32_t TimeOnMS, uint32_t TimeOffMS)
{
oosmos_Allocate(pToggle, toggle, toggleMAX, NULL);

oosmos_ObjectThreadInit(pToggle, m_ObjectThread, ToggleThread, true);

pToggle->m_pPin = pPin;
pToggle->m_TimeOnMS = TimeOnMS;
pToggle->m_TimeOffMS = TimeOffMS;

return pToggle;
}

oosmos/Classes/toggle.c

Declares an orthogonal state in your OOSMOS state machine object.
See line 38 in the code snippet below for an example.

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//	[MIT]
// OOSMOS EnterExit Example
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#include "oosmos.h"	[...]
#include <stdbool.h>
#include <stdio.h>

//>>>EVENTS
enum {
evTweak = 1
};

#ifdef oosmos_DEBUG
static const char * OOSMOS_EventNames(int EventCode)
{
switch (EventCode) {
case evTweak: return "evTweak";
default: return "";
}
}
#endif
//<<<EVENTS

typedef struct testTag test;

typedef union {
oosmos_sEvent Base;
} uEvents;

struct testTag
{
//>>>DECL
oosmos_sStateMachine(ROOT, uEvents, 3);
oosmos_sOrtho Active_State;
oosmos_sOrthoRegion Active_Region1_State;
oosmos_sLeaf Active_Region1_Moving_State;
oosmos_sOrthoRegion Active_Region2_State;
oosmos_sComposite Active_Region2_Outer_State;
oosmos_sLeaf Active_Region2_Outer_Inner_State;
oosmos_sOrthoRegion Active_Region3_State;
oosmos_sLeaf Active_Region3_Leaf_State;
oosmos_sLeaf Active_Region3_Running_State;
//<<<DECL
};

//>>>CODE	[...]
static bool Active_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case evTweak: {
return oosmos_Transition(pTest, pState, Active_Region2_Outer_State);
}
}

return false;
}

static bool Active_Region3_Leaf_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_COMPLETE: {
return oosmos_Transition(pTest, pState, Active_Region3_Running_State);
}
}

return false;
}
//<<<CODE

static test * testNew(void)
{
oosmos_Allocate(pTest, test, 1, NULL);

//>>>INIT
oosmos_StateMachineInit(pTest, ROOT, NULL, Active_State);
oosmos_OrthoInit(pTest, Active_State, ROOT, Active_State_Code);
oosmos_OrthoRegionInit(pTest, Active_Region1_State, Active_State, Active_Region1_Moving_State, NULL);
oosmos_LeafInit(pTest, Active_Region1_Moving_State, Active_Region1_State, NULL);
oosmos_OrthoRegionInit(pTest, Active_Region2_State, Active_State, Active_Region2_Outer_State, NULL);
oosmos_CompositeInit(pTest, Active_Region2_Outer_State, Active_Region2_State, Active_Region2_Outer_Inner_State, NULL);
oosmos_LeafInit(pTest, Active_Region2_Outer_Inner_State, Active_Region2_Outer_State, NULL);
oosmos_OrthoRegionInit(pTest, Active_Region3_State, Active_State, Active_Region3_Leaf_State, NULL);
oosmos_LeafInit(pTest, Active_Region3_Leaf_State, Active_Region3_State, Active_Region3_Leaf_State_Code);
oosmos_LeafInit(pTest, Active_Region3_Running_State, Active_Region3_State, NULL);

oosmos_Debug(pTest, OOSMOS_EventNames);
//<<<INIT

return pTest;
}

static void QueueEventRoutine(const test * pTest, int EventCode)
{
oosmos_PushEventCode(pTest, EventCode);
oosmos_RunStateMachines();
}

extern int main(void)
{
test * pTest = testNew();
QueueEventRoutine(pTest, evTweak);

if (oosmos_IsInState(pTest, &pTest->Active_Region2_Outer_Inner_State)) {
printf("SUCCESS\n");
} else {
printf("FAILURE\n");
}

return 0;
}

oosmos/Examples/Ortho/Windows/EnterExit.c

oosmos_sOrthoRegion declares an orthogonal region state in your OOSMOS state machine object.
See line 39 in the code snippet below for an example.

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//	[MIT]
// OOSMOS EnterExit Example
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#include "oosmos.h"	[...]
#include <stdbool.h>
#include <stdio.h>

//>>>EVENTS
enum {
evTweak = 1
};

#ifdef oosmos_DEBUG
static const char * OOSMOS_EventNames(int EventCode)
{
switch (EventCode) {
case evTweak: return "evTweak";
default: return "";
}
}
#endif
//<<<EVENTS

typedef struct testTag test;

typedef union {
oosmos_sEvent Base;
} uEvents;

struct testTag
{
//>>>DECL
oosmos_sStateMachine(ROOT, uEvents, 3);
oosmos_sOrtho Active_State;
oosmos_sOrthoRegion Active_Region1_State;
oosmos_sLeaf Active_Region1_Moving_State;
oosmos_sOrthoRegion Active_Region2_State;
oosmos_sComposite Active_Region2_Outer_State;
oosmos_sLeaf Active_Region2_Outer_Inner_State;
oosmos_sOrthoRegion Active_Region3_State;
oosmos_sLeaf Active_Region3_Leaf_State;
oosmos_sLeaf Active_Region3_Running_State;
//<<<DECL
};	[...]

//>>>CODE
static bool Active_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case evTweak: {
return oosmos_Transition(pTest, pState, Active_Region2_Outer_State);
}
}

return false;
}

static bool Active_Region3_Leaf_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_COMPLETE: {
return oosmos_Transition(pTest, pState, Active_Region3_Running_State);
}
}

return false;
}
//<<<CODE

static test * testNew(void)
{
oosmos_Allocate(pTest, test, 1, NULL);

//>>>INIT
oosmos_StateMachineInit(pTest, ROOT, NULL, Active_State);
oosmos_OrthoInit(pTest, Active_State, ROOT, Active_State_Code);
oosmos_OrthoRegionInit(pTest, Active_Region1_State, Active_State, Active_Region1_Moving_State, NULL);
oosmos_LeafInit(pTest, Active_Region1_Moving_State, Active_Region1_State, NULL);
oosmos_OrthoRegionInit(pTest, Active_Region2_State, Active_State, Active_Region2_Outer_State, NULL);
oosmos_CompositeInit(pTest, Active_Region2_Outer_State, Active_Region2_State, Active_Region2_Outer_Inner_State, NULL);
oosmos_LeafInit(pTest, Active_Region2_Outer_Inner_State, Active_Region2_Outer_State, NULL);
oosmos_OrthoRegionInit(pTest, Active_Region3_State, Active_State, Active_Region3_Leaf_State, NULL);
oosmos_LeafInit(pTest, Active_Region3_Leaf_State, Active_Region3_State, Active_Region3_Leaf_State_Code);
oosmos_LeafInit(pTest, Active_Region3_Running_State, Active_Region3_State, NULL);

oosmos_Debug(pTest, OOSMOS_EventNames);
//<<<INIT

return pTest;
}

static void QueueEventRoutine(const test * pTest, int EventCode)
{
oosmos_PushEventCode(pTest, EventCode);
oosmos_RunStateMachines();
}

extern int main(void)
{
test * pTest = testNew();
QueueEventRoutine(pTest, evTweak);

if (oosmos_IsInState(pTest, &pTest->Active_Region2_Outer_Inner_State)) {
printf("SUCCESS\n");
} else {
printf("FAILURE\n");
}

return 0;
}

oosmos/Examples/Ortho/Windows/EnterExit.c

OOSMOS has a generalized queue mechanism that serves two purposes:

To hold events. A state machine object can have a queue onto which events are queued to be handled by the current state. If the event is not handled by the current state or any of its parent states, the event is thrown away.
To hold work. An object then periodically checks the queue for work to be done. In this way, the queue mechanism supports a server model.

Study the uart example below. Note that there is no state machine in this object. There are, however, two work queues. One that stores data received from the UART that is pushed onto the queue in an interrupt service routine (ISR). See line 31. The other stores data to be sent. See line 26.

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//	[MIT]
// OOSMOS uart Class
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#include "oosmos.h"	[...]
#include "uart.h"
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <stdarg.h>

typedef enum
{
sendAwaitingCharToSend_State,
sendAwaitingReady_State,
sendAwaitingComplete_State
} eSendStates;

struct uartTag
{
oosmos_sActiveObject m_ActiveObject;

oosmos_sQueue m_SendDataQueue;
uint8_t m_SendDataQueueData[200];
eSendStates m_SendState;
uint8_t m_CharToSend;

oosmos_sQueue m_ReceiveDataQueue;
uint8_t m_ReceiveDataQueueData[10];
oosmos_sSubscriberList m_ReceivedByteEventSubscribers[1];

uint8_t m_PlibUartID;
uint8_t m_UartModule;
};

#if defined _UART6	[...]
#define MaxUARTS 6
#elif defined _UART5
#define MaxUARTS 5
#elif defined _UART4
#define MaxUARTS 4
#elif defined _UART3
#define MaxUARTS 3
#elif defined _UART2
#define MaxUARTS 2
#elif defined _UART1
#define MaxUARTS 1
#endif

static uart UartList[MaxUARTS];
static unsigned UartCount;

static const unsigned UartIndex_to_PlibUartId[] =
{
#ifdef _UART1
UART1,
#endif
#ifdef _UART2
UART2,
#endif
#ifdef _UART3
UART3,
#endif
#ifdef _UART4
UART4,
#endif
#ifdef _UART5
UART5,
#endif
#ifdef _UART6
UART6,
#endif
};

static void EnableInterrupt(uart * pUART)
{
INTEnable(INT_SOURCE_UART_RX(pUART->m_PlibUartID), INT_ENABLED);
}

static void DisableInterrupt(uart * pUART)
{
INTEnable(INT_SOURCE_UART_RX(pUART->m_PlibUartID), INT_DISABLED);
}

static uint16_t GetPriorityBits(const unsigned PriorityNumber)
{
switch (PriorityNumber) {
case 1: return INT_PRIORITY_LEVEL_1;
case 2: return INT_PRIORITY_LEVEL_2;
case 3: return INT_PRIORITY_LEVEL_3;
case 4: return INT_PRIORITY_LEVEL_4;
case 5: return INT_PRIORITY_LEVEL_5;
case 6: return INT_PRIORITY_LEVEL_6;
case 7: return INT_PRIORITY_LEVEL_7;
default: oosmos_FOREVER();
}
}

static void RunReceiverStateMachine(void * pObject)
{
uart * pUART = (uart *) pObject;
uint8_t Byte;

DisableInterrupt(pUART);
const bool PopSuccess = oosmos_QueuePop(&pUART->m_ReceiveDataQueue, &Byte, sizeof(Byte));
EnableInterrupt(pUART);

if (PopSuccess) {
uart_sReceivedByteEvent ReceivedByteEvent = { oosmos_EMPTY_EVENT, Byte };
oosmos_SubscriberListNotifyWithArgs(pUART->m_ReceivedByteEventSubscribers, ReceivedByteEvent);
}
}

static void RunSenderStateMachine(void * pObject)
{
uart * pUART = (uart *) pObject;

switch (pUART->m_SendState) {
case sendAwaitingCharToSend_State: {
const bool PopSuccess = oosmos_QueuePop(&pUART->m_SendDataQueue, &pUART->m_CharToSend, sizeof(pUART->m_CharToSend));

if (PopSuccess)
pUART->m_SendState = sendAwaitingReady_State;

break;
}
case sendAwaitingReady_State: {
if (UARTTransmitterIsReady(pUART->m_PlibUartID)) {
UARTSendDataByte(pUART->m_PlibUartID, pUART->m_CharToSend);
pUART->m_SendState = sendAwaitingComplete_State;
}

break;
}
case sendAwaitingComplete_State: {
if (UARTTransmissionHasCompleted(pUART->m_PlibUartID))
pUART->m_SendState = sendAwaitingCharToSend_State;

break;
}
}
}

static void RunStateMachine(void * pObject)
{
RunSenderStateMachine(pObject);
RunReceiverStateMachine(pObject);
}

static void ISR(const unsigned UartModule)
{
uart * pUART = UartList;

for (unsigned Count = 1; Count <= UartCount; pUART++, Count++) {
if (UartModule <= pUART->m_UartModule) {
break;
}
}

const unsigned PlibUartId = pUART->m_PlibUartID;

if (INTGetFlag(INT_SOURCE_UART_RX(PlibUartId))) {
while (UARTReceivedDataIsAvailable(PlibUartId)) {
const uint8_t Byte = UARTGetDataByte(PlibUartId);
oosmos_QueuePush(&pUART->m_ReceiveDataQueue, &Byte, sizeof(Byte));
}

INTClearFlag(INT_SOURCE_UART_RX(PlibUartId));
}
}

static uint32_t GetPeripheralClock(void)
{
return (oosmos_GetClockSpeedInMHz()*1000000) / (1 << OSCCONbits.PBDIV);
}

extern void uartPrintf(uart * pUART, const char * pFormat, ...)
{
char Buffer[100];
va_list ArgList;

va_start(ArgList, pFormat);
vsprintf(Buffer, pFormat, ArgList);
uartSendString(pUART, Buffer);
}

extern void uartSendChar(uart * pUART, const char Char)
{
oosmos_QueuePush(&pUART->m_SendDataQueue, &Char, sizeof(Char));
}

extern void uartSendString(uart * pUART, const char * pString)
{
uint8_t Char;

while (Char = *pString++, Char) {
uartSendChar(pUART, Char);
}
}

extern void uartStart(uart * pUART)
{
const unsigned PlibUartId = pUART->m_PlibUartID;

UARTEnable(PlibUartId, UART_ENABLE_FLAGS(UART_PERIPHERAL \| UART_RX \| UART_TX));
EnableInterrupt(pUART);
}

//
// 'UartModule' is 1, 2, etc.
//
extern uart * uartNew(const unsigned UartModule, const unsigned BaudRate)
{
oosmos_AllocateVisible(pUART, uart, UartList, UartCount, MaxUARTS, NULL);

pUART->m_UartModule = UartModule;

const unsigned PlibUartID = UartIndex_to_PlibUartId[UartModule-1];
pUART->m_PlibUartID = PlibUartID;

UARTConfigure(PlibUartID, UART_ENABLE_PINS_TX_RX_ONLY);
UARTSetFifoMode(PlibUartID, UART_INTERRUPT_ON_TX_NOT_FULL \| UART_INTERRUPT_ON_RX_NOT_EMPTY);
UARTSetLineControl(PlibUartID, UART_DATA_SIZE_8_BITS \| UART_PARITY_NONE \| UART_STOP_BITS_1);
UARTSetDataRate(PlibUartID, GetPeripheralClock(), BaudRate);

const unsigned Priority = 1;
INTSetVectorPriority(INT_VECTOR_UART(PlibUartID), GetPriorityBits(Priority));
INTSetVectorSubPriority(INT_VECTOR_UART(PlibUartID), INT_SUB_PRIORITY_LEVEL_0);

oosmos_QueueConstruct(&pUART->m_SendDataQueue, pUART->m_SendDataQueueData, sizeof(pUART->m_SendDataQueueData), sizeof(uint8_t));

oosmos_QueueConstruct(&pUART->m_ReceiveDataQueue, pUART->m_ReceiveDataQueueData, sizeof(pUART->m_ReceiveDataQueueData), sizeof(uint8_t));
oosmos_SubscriberListInit(pUART->m_ReceivedByteEventSubscribers);

oosmos_ActiveObjectInit(pUART, m_ActiveObject, RunStateMachine);

return pUART;
}

extern void uartSubscribe(uart * pUART, oosmos_sQueue * pQueue, const int EventCode, void * pContext)
{
oosmos_SubscriberListAdd(pUART->m_ReceivedByteEventSubscribers, pQueue, EventCode, pContext);
}

#define uartVector(N) void __ISR(_UART_##N##_VECTOR) IntUart##N##Handler() { ISR(N); }

#ifdef _UART1
uartVector(1)
#endif

#ifdef _UART2
uartVector(2)
#endif

#ifdef _UART3
uartVector(3)
#endif

#ifdef _UART4
uartVector(4)
#endif

#ifdef _UART5
uartVector(5)
#endif

#ifdef _UART6
uartVector(6)
#endif

oosmos/Classes/PIC32/uart.c

oosmos_sState is a data type that holds state metadata and is never used directly - only contained by other OOSMOS state types.

oosmos_sStateMachine declares the state machine in your OOSMOS object. It also preallocates the object's event queue.
See line 37 in the code snippet below for an example.

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oosmos_sStateMachine(ROOT, EventType, MaxEvents);

Prototype

StateMachine	The name of the state machine. Must always be `ROOT`: the `OOSMOS` object macros (`oosmos_PushEventCode`, `oosmos_IsInState`, `oosmos_RunStateMachine`, etc.) refer to the state machine member by that name.
EventType	Datatype of elements queued to the event queue. Can be a `union` of other types.
MaxEvents	The maximum number of elements that the event queue can hold.
See Also	`sStateMachineNoQueue`

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//	[MIT]
// OOSMOS EnterExit Example
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#include "oosmos.h"	[...]
#include <stdbool.h>
#include <stdio.h>

//>>>EVENTS
enum {
evTweak = 1
};

#ifdef oosmos_DEBUG
static const char * OOSMOS_EventNames(int EventCode)
{
switch (EventCode) {
case evTweak: return "evTweak";
default: return "";
}
}
#endif
//<<<EVENTS

typedef struct testTag test;

typedef union {
oosmos_sEvent Base;
} uEvents;

struct testTag
{
//>>>DECL
oosmos_sStateMachine(ROOT, uEvents, 3);
oosmos_sOrtho Active_State;
oosmos_sOrthoRegion Active_Region1_State;
oosmos_sLeaf Active_Region1_Moving_State;
oosmos_sOrthoRegion Active_Region2_State;
oosmos_sComposite Active_Region2_Outer_State;
oosmos_sLeaf Active_Region2_Outer_Inner_State;
oosmos_sOrthoRegion Active_Region3_State;
oosmos_sLeaf Active_Region3_Leaf_State;
oosmos_sLeaf Active_Region3_Running_State;
//<<<DECL
};

//>>>CODE	[...]
static bool Active_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case evTweak: {
return oosmos_Transition(pTest, pState, Active_Region2_Outer_State);
}
}

return false;
}

static bool Active_Region3_Leaf_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_COMPLETE: {
return oosmos_Transition(pTest, pState, Active_Region3_Running_State);
}
}

return false;
}
//<<<CODE

static test * testNew(void)
{
oosmos_Allocate(pTest, test, 1, NULL);

//>>>INIT
oosmos_StateMachineInit(pTest, ROOT, NULL, Active_State);
oosmos_OrthoInit(pTest, Active_State, ROOT, Active_State_Code);
oosmos_OrthoRegionInit(pTest, Active_Region1_State, Active_State, Active_Region1_Moving_State, NULL);
oosmos_LeafInit(pTest, Active_Region1_Moving_State, Active_Region1_State, NULL);
oosmos_OrthoRegionInit(pTest, Active_Region2_State, Active_State, Active_Region2_Outer_State, NULL);
oosmos_CompositeInit(pTest, Active_Region2_Outer_State, Active_Region2_State, Active_Region2_Outer_Inner_State, NULL);
oosmos_LeafInit(pTest, Active_Region2_Outer_Inner_State, Active_Region2_Outer_State, NULL);
oosmos_OrthoRegionInit(pTest, Active_Region3_State, Active_State, Active_Region3_Leaf_State, NULL);
oosmos_LeafInit(pTest, Active_Region3_Leaf_State, Active_Region3_State, Active_Region3_Leaf_State_Code);
oosmos_LeafInit(pTest, Active_Region3_Running_State, Active_Region3_State, NULL);

oosmos_Debug(pTest, OOSMOS_EventNames);
//<<<INIT

return pTest;
}

static void QueueEventRoutine(const test * pTest, int EventCode)
{
oosmos_PushEventCode(pTest, EventCode);
oosmos_RunStateMachines();
}

extern int main(void)
{
test * pTest = testNew();
QueueEventRoutine(pTest, evTweak);

if (oosmos_IsInState(pTest, &pTest->Active_Region2_Outer_Inner_State)) {
printf("SUCCESS\n");
} else {
printf("FAILURE\n");
}

return 0;
}

oosmos/Examples/Ortho/Windows/EnterExit.c

oosmos_sStateMachineNoQueue declares the state machine in your OOSMOS object. Use this form when your object will not accept events.
See line 22 in the code snippet below for an example.

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oosmos_sStateMachineNoQueue(ROOT);

Prototype

StateMachine	The name of the state machine. Must always be `ROOT`: the `OOSMOS` object macros (`oosmos_PushEventCode`, `oosmos_IsInState`, `oosmos_RunStateMachine`, etc.) refer to the state machine member by that name.
See Also	`sStateMachine`

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//	[MIT]
// OOSMOS toggle Class
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#include "oosmos.h"	[...]
#include "toggle.h"
#include "pin.h"
#include <stdbool.h>
#include <stdint.h>
#include <stddef.h>

#ifndef toggleMAX
#define toggleMAX 4
#endif

struct toggleTag
{
//>>>DECL
oosmos_sStateMachineNoQueue(ROOT);
oosmos_sLeaf Off_State;
oosmos_sLeaf On_State;
//<<<DECL

pin * m_pPin;
uint32_t m_TimeOnMS;
uint32_t m_TimeOffMS;
};

//>>>CODE	[...]
static bool Off_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
toggle * pToggle = (toggle *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_ENTER: {
return oosmos_StateTimeoutMS(pState, (uint32_t) pToggle->m_TimeOffMS);
}
case oosmos_TIMEOUT: {
return oosmos_Transition(pToggle, pState, On_State);
}
}

return false;
}

static bool On_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
toggle * pToggle = (toggle *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_ENTER: {
pinOn(pToggle->m_pPin);
return oosmos_StateTimeoutMS(pState, (uint32_t) pToggle->m_TimeOnMS);
}
case oosmos_EXIT: {
pinOff(pToggle->m_pPin);
return true;
}
case oosmos_TIMEOUT: {
return oosmos_Transition(pToggle, pState, Off_State);
}
}

return false;
}
//<<<CODE

extern toggle * toggleNew(pin * pPin, uint32_t TimeOnMS, uint32_t TimeOffMS)
{
oosmos_Allocate(pToggle, toggle, toggleMAX, NULL);

//>>>INIT
oosmos_StateMachineInitNoQueue(pToggle, ROOT, NULL, On_State);
oosmos_LeafInit(pToggle, Off_State, ROOT, Off_State_Code);
oosmos_LeafInit(pToggle, On_State, ROOT, On_State_Code);
//<<<INIT

pToggle->m_pPin = pPin;
pToggle->m_TimeOnMS = TimeOnMS;
pToggle->m_TimeOffMS = TimeOffMS;

return pToggle;
}

oosmos/Classes/toggle_state.c

oosmos_sSubscriberList is a data type that holds a list of subscribers interested in the occurrence of a particular event.
See lines 40 and 41 of the code snippet below for examples.

See Also

SubscriberListAdd, SubscriberListInit, SubscriberListNotify, SubscriberListNotifyWithArgs

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//	[MIT]
// OOSMOS sw Class
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#ifndef swMaxSwitches	[...]
#define swMaxSwitches 20
#endif

#ifndef swMaxCloseSubscribers
#define swMaxCloseSubscribers 1
#endif

#ifndef swMaxOpenSubscribers
#define swMaxOpenSubscribers 1
#endif

//===================================

#include "oosmos.h"
#include "pin.h"
#include "sw.h"
#include <stdbool.h>
#include <stddef.h>

typedef enum {
Unknown_State = 1,
Open_State,
Closed_State
} eStates;

struct swTag
{
pin * m_pPin;
eStates m_State;

oosmos_sActiveObject m_ActiveObject;
oosmos_sSubscriberList m_CloseEvent[swMaxCloseSubscribers];
oosmos_sSubscriberList m_OpenEvent[swMaxOpenSubscribers];
};

extern sw * swNewDetached(pin * pPin)	[...]
{
oosmos_Allocate(pSwitch, sw, swMaxSwitches, NULL);

pSwitch->m_pPin = pPin;
pSwitch->m_State = Unknown_State;

oosmos_SubscriberListInit(pSwitch->m_CloseEvent);
oosmos_SubscriberListInit(pSwitch->m_OpenEvent);

return pSwitch;
}

extern sw * swNew(pin * pPin)
{
sw * pSwitch = swNewDetached(pPin);

oosmos_ActiveObjectInit(pSwitch, m_ActiveObject, swRunStateMachine);

return pSwitch;
}

extern void swSubscribeCloseEvent(sw * pSwitch, oosmos_sQueue * pQueue, int CloseEventCode, void * pContext)
{
oosmos_POINTER_GUARD(pSwitch);

oosmos_SubscriberListAdd(pSwitch->m_CloseEvent, pQueue, CloseEventCode, pContext);
}

extern void swSubscribeOpenEvent(sw * pSwitch, oosmos_sQueue * pQueue, int OpenEventCode, void * pContext)
{
oosmos_POINTER_GUARD(pSwitch);

oosmos_SubscriberListAdd(pSwitch->m_OpenEvent, pQueue, OpenEventCode, pContext);
}

static eStates PhysicalSwitchState(const sw * pSwitch)
{
oosmos_POINTER_GUARD(pSwitch);

return pinIsOn(pSwitch->m_pPin) ? Closed_State : Open_State;
}

extern bool swIsOpen(const sw * pSwitch)
{
return !swIsClosed(pSwitch);
}

extern bool swIsClosed(const sw * pSwitch)
{
oosmos_POINTER_GUARD(pSwitch);

if (pSwitch->m_State == Unknown_State) {
return PhysicalSwitchState(pSwitch) == Closed_State;
}

return pSwitch->m_State == Closed_State;
}

extern void swRunStateMachine(sw * pSwitch)
{
oosmos_POINTER_GUARD(pSwitch);

switch (pSwitch->m_State) {
case Open_State: {
if (pinIsOn(pSwitch->m_pPin)) {
pSwitch->m_State = Closed_State;
oosmos_SubscriberListNotify(pSwitch->m_CloseEvent);
}

break;
}
case Closed_State: {
if (pinIsOff(pSwitch->m_pPin)) {
pSwitch->m_State = Open_State;
oosmos_SubscriberListNotify(pSwitch->m_OpenEvent);
}

break;
}
case Unknown_State: {
pSwitch->m_State = pinIsOn(pSwitch->m_pPin) ? Closed_State : Open_State;
break;
}
}
}

oosmos/Classes/sw.c

oosmos_StateMachineDetach detaches the object's state machine from the list of state machines run by oosmos_RunStateMachines. Useful when an object reaches its end of life, for example upon entry to a final state.

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void oosmos_StateMachineDetach(pObject, StateMachine);

Prototype

pObject	The address of the object that contains the state machine.
StateMachine	The name of the state machine. Must always be `ROOT`.
See Also	`RunStateMachines`, `StateMachineInit`

oosmos_StateMachineInit initializes an oosmos_sStateMachine object member.
See line 95 of the code snippet below for an example.

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oosmos_StateMachineInit(pObject, StateMachine, ParentState, DefaultState);

Prototype

pObject	The address of the object that contains the state machine.
StateMachine	The name of the state machine.
ParentState	The name of the parent state. Must always be `NULL`. This argument exists for overall state machine initialization readability.
DefaultState	The name of the default state.
See Also	`StateMachineDetach`, `StateMachineInitNoQueue`

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//	[MIT]
// OOSMOS - EventDemo example, motor object
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#include "oosmos.h"	[...]
#include "motor.h"
#include <stdbool.h>
#include <stdio.h>

//>>>EVENTS
enum {
evStart = 1,
evStop = 2
};

#ifdef oosmos_DEBUG
static const char * OOSMOS_EventNames(int EventCode)
{
switch (EventCode) {
case evStart: return "evStart";
case evStop: return "evStop";
default: return "";
}
}
#endif
//<<<EVENTS

typedef union {
oosmos_sEvent Event;
} uEvents;

struct motorTag
{
//>>>DECL
oosmos_sStateMachine(ROOT, uEvents, 3);
oosmos_sLeaf Idle_State;
oosmos_sLeaf Moving_State;
//<<<DECL
};

#ifndef motorMAX
#define motorMAX 3
#endif

static void MovingThread(oosmos_sState * pState)
{
oosmos_ThreadBegin();
for (;;) {
printf("motor: MOVING...\n");
oosmos_ThreadDelayMS(500);
}
oosmos_ThreadEnd();
}

//>>>CODE
static bool Idle_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
motor * pMotor = (motor *) pObject;

switch (oosmos_EventCode(pEvent)) {
case evStart: {
return oosmos_Transition(pMotor, pState, Moving_State);
}
}

return false;
}

static bool Moving_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
motor * pMotor = (motor *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_POLL: {
MovingThread(pState);
return true;
}
case evStop: {
return oosmos_Transition(pMotor, pState, Idle_State);
}
}

return false;
}
//<<<CODE

extern motor * motorNew(void)
{
oosmos_Allocate(pMotor, motor, motorMAX, NULL);

//>>>INIT
oosmos_StateMachineInit(pMotor, ROOT, NULL, Idle_State);
oosmos_LeafInit(pMotor, Idle_State, ROOT, Idle_State_Code);
oosmos_LeafInit(pMotor, Moving_State, ROOT, Moving_State_Code);

oosmos_Debug(pMotor, OOSMOS_EventNames);
//<<<INIT

return pMotor;
}

extern void motorOn(const motor * pMotor)	[...]
{
oosmos_PushEventCode(pMotor, evStart);
}

extern void motorOff(const motor * pMotor)
{
oosmos_PushEventCode(pMotor, evStop);
}

oosmos/Examples/EventDemo/Windows/motor.c

oosmos_StateMachineInitNoQueue initializes an oosmos_sStateMachineNoQueue object member.
See line 76 of the code snippet below for an example.

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oosmos_StateMachineInitNoQueue(pObject, StateMachine, ParentState, DefaultState);

Prototype

pObject	The address of the object that contains the state machine.
StateMachine	The name of the state machine.
ParentState	The name of the parent state. Must always be `NULL`. This argument exists for overall state machine initialization readability.
DefaultState	The name of the default state.
See Also	`StateMachineInit`

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//	[MIT]
// OOSMOS toggle Class
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#include "oosmos.h"	[...]
#include "toggle.h"
#include "pin.h"
#include <stdbool.h>
#include <stdint.h>
#include <stddef.h>

#ifndef toggleMAX
#define toggleMAX 4
#endif

struct toggleTag
{
//>>>DECL
oosmos_sStateMachineNoQueue(ROOT);
oosmos_sLeaf Off_State;
oosmos_sLeaf On_State;
//<<<DECL

pin * m_pPin;
uint32_t m_TimeOnMS;
uint32_t m_TimeOffMS;
};

//>>>CODE
static bool Off_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
toggle * pToggle = (toggle *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_ENTER: {
return oosmos_StateTimeoutMS(pState, (uint32_t) pToggle->m_TimeOffMS);
}
case oosmos_TIMEOUT: {
return oosmos_Transition(pToggle, pState, On_State);
}
}

return false;
}

static bool On_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
toggle * pToggle = (toggle *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_ENTER: {
pinOn(pToggle->m_pPin);
return oosmos_StateTimeoutMS(pState, (uint32_t) pToggle->m_TimeOnMS);
}
case oosmos_EXIT: {
pinOff(pToggle->m_pPin);
return true;
}
case oosmos_TIMEOUT: {
return oosmos_Transition(pToggle, pState, Off_State);
}
}

return false;
}
//<<<CODE

extern toggle * toggleNew(pin * pPin, uint32_t TimeOnMS, uint32_t TimeOffMS)
{
oosmos_Allocate(pToggle, toggle, toggleMAX, NULL);

//>>>INIT
oosmos_StateMachineInitNoQueue(pToggle, ROOT, NULL, On_State);
oosmos_LeafInit(pToggle, Off_State, ROOT, Off_State_Code);
oosmos_LeafInit(pToggle, On_State, ROOT, On_State_Code);
//<<<INIT

pToggle->m_pPin = pPin;
pToggle->m_TimeOnMS = TimeOnMS;
pToggle->m_TimeOffMS = TimeOffMS;

return pToggle;
}

oosmos/Classes/toggle_state.c

oosmos_StateTimeoutMS is used to set a state's timeout value. If another event or condition does not transition you out of the current state before the number of milliseconds in your timeout value elapses, then an oosmos_TIMEOUT event will be delivered to the current state's event handler.
You will typically set your state's timeout value upon entry to the state in the oosmos_ENTER event action.
See StateTimeout.c, below, line 37 for an example of setting the timeout and line 39 for an example of an oosmos_TIMEOUT event handler.

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bool oosmos_StateTimeoutMS(oosmos_sState * pState, uint32_t Milliseconds)

Prototype

pState	The same `pState` argument that was passed into the containing state handler.
Milliseconds	The timeout value in milliseconds.
RETURN	Always returns `true`.
See Also	`StateTimeoutSeconds`, `StateTimeoutUS`

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//	[MIT]
// OOSMOS StateTimeout Example
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#include "oosmos.h"	[...]
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>

typedef struct testTag test;

//<<<EVENTS
//>>>EVENTS

struct testTag
{
//>>>DECL
oosmos_sStateMachineNoQueue(ROOT);
oosmos_sLeaf MS_State;
oosmos_sLeaf Seconds_State;
oosmos_sLeaf US_State;
oosmos_sLeaf Done_State;
//<<<DECL
unsigned m_TimeMS;
};

//>>>CODE
static bool MS_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_ENTER: {
return oosmos_StateTimeoutMS(pState, (uint32_t) pTest->m_TimeMS);
}
case oosmos_TIMEOUT: {
return oosmos_Transition(pTest, pState, Seconds_State);
}
}

return false;
}

static bool Seconds_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)	[...]
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_ENTER: {
return oosmos_StateTimeoutSeconds(pState, (uint32_t) 1);
}
case oosmos_TIMEOUT: {
return oosmos_Transition(pTest, pState, US_State);
}
}

return false;
}

static bool US_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_ENTER: {
return oosmos_StateTimeoutUS(pState, (uint32_t) 100000);
}
case oosmos_TIMEOUT: {
return oosmos_Transition(pTest, pState, Done_State);
}
}

return false;
}
//<<<CODE

static test * testNew(void)
{
oosmos_Allocate(pTest, test, 1, NULL);

//>>>INIT
oosmos_StateMachineInitNoQueue(pTest, ROOT, NULL, MS_State);
oosmos_LeafInit(pTest, MS_State, ROOT, MS_State_Code);
oosmos_LeafInit(pTest, Seconds_State, ROOT, Seconds_State_Code);
oosmos_LeafInit(pTest, US_State, ROOT, US_State_Code);
oosmos_LeafInit(pTest, Done_State, ROOT, NULL);

oosmos_Debug(pTest, NULL);
//<<<INIT

pTest->m_TimeMS = 1000;

return pTest;
}

extern int main(void)
{
test * pTest = testNew();

for (;;) {
oosmos_RunStateMachines();

if (oosmos_IsInState(pTest, &pTest->Done_State)) {
break;
}

oosmos_DelayMS(1);
}

printf("SUCCESS\n");

return 0;
}

oosmos/Examples/Basic/Windows/StateTimeout.c

oosmos_StateTimeoutSeconds is used to set a state's timeout value. If another event or condition does not transition you out of the current state before the number of seconds in your timeout value elapses, then an oosmos_TIMEOUT event will be delivered to the current state's event handler.
You will typically set your state's timeout value upon entry to the state in the oosmos_ENTER event action.
See StateTimeout.c, below, line 53 for an example of setting the timeout and line 55 for an example of an oosmos_TIMEOUT event handler.

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bool oosmos_StateTimeoutSeconds(oosmos_sState * pState, uint32_t Seconds)

Prototype

pState	The same `pState` argument that was passed into the containing state handler.
Seconds	The timeout value in seconds.
RETURN	Always returns `true`.
See Also	`StateTimeoutMS`, `StateTimeoutUS`

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//	[MIT]
// OOSMOS StateTimeout Example
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#include "oosmos.h"	[...]
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>

typedef struct testTag test;

//<<<EVENTS
//>>>EVENTS

struct testTag
{
//>>>DECL
oosmos_sStateMachineNoQueue(ROOT);
oosmos_sLeaf MS_State;
oosmos_sLeaf Seconds_State;
oosmos_sLeaf US_State;
oosmos_sLeaf Done_State;
//<<<DECL
unsigned m_TimeMS;
};

//>>>CODE
static bool MS_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_ENTER: {
return oosmos_StateTimeoutMS(pState, (uint32_t) pTest->m_TimeMS);
}
case oosmos_TIMEOUT: {
return oosmos_Transition(pTest, pState, Seconds_State);
}
}

return false;
}

static bool Seconds_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_ENTER: {
return oosmos_StateTimeoutSeconds(pState, (uint32_t) 1);
}
case oosmos_TIMEOUT: {
return oosmos_Transition(pTest, pState, US_State);
}
}

return false;
}

static bool US_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)	[...]
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_ENTER: {
return oosmos_StateTimeoutUS(pState, (uint32_t) 100000);
}
case oosmos_TIMEOUT: {
return oosmos_Transition(pTest, pState, Done_State);
}
}

return false;
}
//<<<CODE

static test * testNew(void)
{
oosmos_Allocate(pTest, test, 1, NULL);

//>>>INIT
oosmos_StateMachineInitNoQueue(pTest, ROOT, NULL, MS_State);
oosmos_LeafInit(pTest, MS_State, ROOT, MS_State_Code);
oosmos_LeafInit(pTest, Seconds_State, ROOT, Seconds_State_Code);
oosmos_LeafInit(pTest, US_State, ROOT, US_State_Code);
oosmos_LeafInit(pTest, Done_State, ROOT, NULL);

oosmos_Debug(pTest, NULL);
//<<<INIT

pTest->m_TimeMS = 1000;

return pTest;
}

extern int main(void)
{
test * pTest = testNew();

for (;;) {
oosmos_RunStateMachines();

if (oosmos_IsInState(pTest, &pTest->Done_State)) {
break;
}

oosmos_DelayMS(1);
}

printf("SUCCESS\n");

return 0;
}

oosmos/Examples/Basic/Windows/StateTimeout.c

oosmos_StateTimeoutUS is used to set a state's timeout value. If another event or condition does not transition you out of the current state before the number of microseconds in your timeout value elapses, then an oosmos_TIMEOUT event will be delivered to the current state's event handler.
You will typically set your state's timeout value upon entry to the state in the oosmos_ENTER event action.
See StateTimeout.c, below, line 69 for an example of setting the timeout and line 71 for an example of an oosmos_TIMEOUT event handler.

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bool oosmos_StateTimeoutUS(oosmos_sState * pState, uint32_t Microseconds)

Prototype

pState	The same `pState` argument that was passed into the containing state handler.
Microseconds	The timeout value in microseconds.
RETURN	Always returns `true`.
See Also	`StateTimeoutMS`, `StateTimeoutSeconds`

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//	[MIT]
// OOSMOS StateTimeout Example
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#include "oosmos.h"	[...]
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>

typedef struct testTag test;

//<<<EVENTS
//>>>EVENTS

struct testTag
{
//>>>DECL
oosmos_sStateMachineNoQueue(ROOT);
oosmos_sLeaf MS_State;
oosmos_sLeaf Seconds_State;
oosmos_sLeaf US_State;
oosmos_sLeaf Done_State;
//<<<DECL
unsigned m_TimeMS;
};

//>>>CODE
static bool MS_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_ENTER: {
return oosmos_StateTimeoutMS(pState, (uint32_t) pTest->m_TimeMS);
}
case oosmos_TIMEOUT: {
return oosmos_Transition(pTest, pState, Seconds_State);
}
}

return false;
}

static bool Seconds_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_ENTER: {
return oosmos_StateTimeoutSeconds(pState, (uint32_t) 1);
}
case oosmos_TIMEOUT: {
return oosmos_Transition(pTest, pState, US_State);
}
}

return false;
}

static bool US_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_ENTER: {
return oosmos_StateTimeoutUS(pState, (uint32_t) 100000);
}
case oosmos_TIMEOUT: {
return oosmos_Transition(pTest, pState, Done_State);
}
}

return false;
}
//<<<CODE	[...]

static test * testNew(void)
{
oosmos_Allocate(pTest, test, 1, NULL);

//>>>INIT
oosmos_StateMachineInitNoQueue(pTest, ROOT, NULL, MS_State);
oosmos_LeafInit(pTest, MS_State, ROOT, MS_State_Code);
oosmos_LeafInit(pTest, Seconds_State, ROOT, Seconds_State_Code);
oosmos_LeafInit(pTest, US_State, ROOT, US_State_Code);
oosmos_LeafInit(pTest, Done_State, ROOT, NULL);

oosmos_Debug(pTest, NULL);
//<<<INIT

pTest->m_TimeMS = 1000;

return pTest;
}

extern int main(void)
{
test * pTest = testNew();

for (;;) {
oosmos_RunStateMachines();

if (oosmos_IsInState(pTest, &pTest->Done_State)) {
break;
}

oosmos_DelayMS(1);
}

printf("SUCCESS\n");

return 0;
}

oosmos/Examples/Basic/Windows/StateTimeout.c

oosmos_sTimeout is a data type that holds timeout metadata supporting the oosmos_TimeoutInSeconds call. See line 19, line 24 and line 32 in the snippet for an example of use.

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//	[MIT]
// OOSMOS TimeoutInSeconds Example
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#include "oosmos.h"
#include <stdint.h>
#include <stdio.h>

static const uint32_t WaitTimeSeconds = 2;

extern int main(void)
{
//
// Allocate a Timeout object.
//
oosmos_sTimeout Timeout;

//
// Set timeout.
//
oosmos_TimeoutInSeconds(&Timeout, WaitTimeSeconds);

printf("Waiting for %lu seconds...\n", (unsigned long) WaitTimeSeconds);

for (;;) {
//
// Check if the time has expired.
//
if (oosmos_TimeoutHasExpired(&Timeout)) {
break;
}

//
// Be polite. Prevent 100% CPU usage on multi-tasked
// machines (e.g. Windows or Linux).
//
oosmos_DelayMS(1);
}

printf("SUCCESS\n");

return 0;
}

oosmos/Examples/Basic/Windows/TimeoutInSeconds.c

Publishers notify subscribers of events that occur within the publisher's object.
oosmos_SubscriberListAdd is called within the publisher's implementation file to add a subscriber to the list of subscribers interested in the occurrence of a particular event.
See lines 40 and 51, 70 and 111 in the code snippet below for an example.

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void oosmos_SubscriberListAdd(SubscriberList, pNotifyQueue, EventCode, pContext);

Prototype

SubscriberList	The `oosmos_sSubscriberList` array member inside an `OOSMOS` object. Must be the array itself, not a pointer to it — the macro computes the number of elements from the array.
pNotifyQueue	Points to the queue of the subscriber onto which published events will be pushed.
EventCode	When the associated event occurs within a publisher, the publisher should post this event code to the subscriber's event queue. Note that the event code is defined within the subscriber's object, not the publisher's.
pContext	A pointer to some type of context information that a notified subscriber can use in any way. Can be `NULL`.
See Also	`SubscriberListInit`, `SubscriberListNotify`, `SubscriberListNotifyWithArgs`, `sSubscriberList`

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//	[MIT]
// OOSMOS sw Class
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#ifndef swMaxSwitches	[...]
#define swMaxSwitches 20
#endif

#ifndef swMaxCloseSubscribers
#define swMaxCloseSubscribers 1
#endif

#ifndef swMaxOpenSubscribers
#define swMaxOpenSubscribers 1
#endif

//===================================

#include "oosmos.h"
#include "pin.h"
#include "sw.h"
#include <stdbool.h>
#include <stddef.h>

typedef enum {
Unknown_State = 1,
Open_State,
Closed_State
} eStates;

struct swTag
{
pin * m_pPin;
eStates m_State;

oosmos_sActiveObject m_ActiveObject;
oosmos_sSubscriberList m_CloseEvent[swMaxCloseSubscribers];
oosmos_sSubscriberList m_OpenEvent[swMaxOpenSubscribers];
};

extern sw * swNewDetached(pin * pPin)
{
oosmos_Allocate(pSwitch, sw, swMaxSwitches, NULL);

pSwitch->m_pPin = pPin;
pSwitch->m_State = Unknown_State;

oosmos_SubscriberListInit(pSwitch->m_CloseEvent);
oosmos_SubscriberListInit(pSwitch->m_OpenEvent);

return pSwitch;
}

extern sw * swNew(pin * pPin)	[...]
{
sw * pSwitch = swNewDetached(pPin);

oosmos_ActiveObjectInit(pSwitch, m_ActiveObject, swRunStateMachine);

return pSwitch;
}

extern void swSubscribeCloseEvent(sw * pSwitch, oosmos_sQueue * pQueue, int CloseEventCode, void * pContext)
{
oosmos_POINTER_GUARD(pSwitch);

oosmos_SubscriberListAdd(pSwitch->m_CloseEvent, pQueue, CloseEventCode, pContext);
}

extern void swSubscribeOpenEvent(sw * pSwitch, oosmos_sQueue * pQueue, int OpenEventCode, void * pContext)	[...]
{
oosmos_POINTER_GUARD(pSwitch);

oosmos_SubscriberListAdd(pSwitch->m_OpenEvent, pQueue, OpenEventCode, pContext);
}

static eStates PhysicalSwitchState(const sw * pSwitch)
{
oosmos_POINTER_GUARD(pSwitch);

return pinIsOn(pSwitch->m_pPin) ? Closed_State : Open_State;
}

extern bool swIsOpen(const sw * pSwitch)
{
return !swIsClosed(pSwitch);
}

extern bool swIsClosed(const sw * pSwitch)
{
oosmos_POINTER_GUARD(pSwitch);

if (pSwitch->m_State == Unknown_State) {
return PhysicalSwitchState(pSwitch) == Closed_State;
}

return pSwitch->m_State == Closed_State;
}

extern void swRunStateMachine(sw * pSwitch)
{
oosmos_POINTER_GUARD(pSwitch);

switch (pSwitch->m_State) {
case Open_State: {
if (pinIsOn(pSwitch->m_pPin)) {
pSwitch->m_State = Closed_State;
oosmos_SubscriberListNotify(pSwitch->m_CloseEvent);
}

break;
}
case Closed_State: {
if (pinIsOff(pSwitch->m_pPin)) {
pSwitch->m_State = Open_State;
oosmos_SubscriberListNotify(pSwitch->m_OpenEvent);
}

break;
}
case Unknown_State: {
pSwitch->m_State = pinIsOn(pSwitch->m_pPin) ? Closed_State : Open_State;
break;
}
}
}

oosmos/Classes/sw.c

oosmos_SubscriberListInit initializes a subscriber list. Subscriber lists are stored within the publisher's object.
See lines 40 and 51, 70 and 111 in the code snippet below for an example.

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void oosmos_SubscriberListInit(SubscriberList);

Prototype

SubscriberList	The `oosmos_sSubscriberList` array member inside an `OOSMOS` object. Must be the array itself, not a pointer to it — the macro computes the number of elements from the array.
See Also	`SubscriberListAdd`, `SubscriberListNotify`, `SubscriberListNotifyWithArgs`, `sSubscriberList`

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//	[MIT]
// OOSMOS sw Class
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#ifndef swMaxSwitches	[...]
#define swMaxSwitches 20
#endif

#ifndef swMaxCloseSubscribers
#define swMaxCloseSubscribers 1
#endif

#ifndef swMaxOpenSubscribers
#define swMaxOpenSubscribers 1
#endif

//===================================

#include "oosmos.h"
#include "pin.h"
#include "sw.h"
#include <stdbool.h>
#include <stddef.h>

typedef enum {
Unknown_State = 1,
Open_State,
Closed_State
} eStates;

struct swTag
{
pin * m_pPin;
eStates m_State;

oosmos_sActiveObject m_ActiveObject;
oosmos_sSubscriberList m_CloseEvent[swMaxCloseSubscribers];
oosmos_sSubscriberList m_OpenEvent[swMaxOpenSubscribers];
};

extern sw * swNewDetached(pin * pPin)
{
oosmos_Allocate(pSwitch, sw, swMaxSwitches, NULL);

pSwitch->m_pPin = pPin;
pSwitch->m_State = Unknown_State;

oosmos_SubscriberListInit(pSwitch->m_CloseEvent);
oosmos_SubscriberListInit(pSwitch->m_OpenEvent);

return pSwitch;
}

extern sw * swNew(pin * pPin)	[...]
{
sw * pSwitch = swNewDetached(pPin);

oosmos_ActiveObjectInit(pSwitch, m_ActiveObject, swRunStateMachine);

return pSwitch;
}

extern void swSubscribeCloseEvent(sw * pSwitch, oosmos_sQueue * pQueue, int CloseEventCode, void * pContext)
{
oosmos_POINTER_GUARD(pSwitch);

oosmos_SubscriberListAdd(pSwitch->m_CloseEvent, pQueue, CloseEventCode, pContext);
}

extern void swSubscribeOpenEvent(sw * pSwitch, oosmos_sQueue * pQueue, int OpenEventCode, void * pContext)	[...]
{
oosmos_POINTER_GUARD(pSwitch);

oosmos_SubscriberListAdd(pSwitch->m_OpenEvent, pQueue, OpenEventCode, pContext);
}

static eStates PhysicalSwitchState(const sw * pSwitch)
{
oosmos_POINTER_GUARD(pSwitch);

return pinIsOn(pSwitch->m_pPin) ? Closed_State : Open_State;
}

extern bool swIsOpen(const sw * pSwitch)
{
return !swIsClosed(pSwitch);
}

extern bool swIsClosed(const sw * pSwitch)
{
oosmos_POINTER_GUARD(pSwitch);

if (pSwitch->m_State == Unknown_State) {
return PhysicalSwitchState(pSwitch) == Closed_State;
}

return pSwitch->m_State == Closed_State;
}

extern void swRunStateMachine(sw * pSwitch)
{
oosmos_POINTER_GUARD(pSwitch);

switch (pSwitch->m_State) {
case Open_State: {
if (pinIsOn(pSwitch->m_pPin)) {
pSwitch->m_State = Closed_State;
oosmos_SubscriberListNotify(pSwitch->m_CloseEvent);
}

break;
}
case Closed_State: {
if (pinIsOff(pSwitch->m_pPin)) {
pSwitch->m_State = Open_State;
oosmos_SubscriberListNotify(pSwitch->m_OpenEvent);
}

break;
}
case Unknown_State: {
pSwitch->m_State = pinIsOn(pSwitch->m_pPin) ? Closed_State : Open_State;
break;
}
}
}

oosmos/Classes/sw.c

Called by a publisher, oosmos_SubscriberListNotify notifies all subscribers of the occurrence of an event.
See lines 40 and 51, 70 and 111 in the code snippet below for an example.

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void oosmos_SubscriberListNotify(SubscriberList);

Prototype

SubscriberList	The `oosmos_sSubscriberList` array member inside an `OOSMOS` object. Must be the array itself, not a pointer to it — the macro computes the number of elements from the array.
See Also	`SubscriberListAdd`, `SubscriberListInit`, `SubscriberListNotifyWithArgs`, `sSubscriberList`

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//	[MIT]
// OOSMOS sw Class
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#ifndef swMaxSwitches	[...]
#define swMaxSwitches 20
#endif

#ifndef swMaxCloseSubscribers
#define swMaxCloseSubscribers 1
#endif

#ifndef swMaxOpenSubscribers
#define swMaxOpenSubscribers 1
#endif

//===================================

#include "oosmos.h"
#include "pin.h"
#include "sw.h"
#include <stdbool.h>
#include <stddef.h>

typedef enum {
Unknown_State = 1,
Open_State,
Closed_State
} eStates;

struct swTag
{
pin * m_pPin;
eStates m_State;

oosmos_sActiveObject m_ActiveObject;
oosmos_sSubscriberList m_CloseEvent[swMaxCloseSubscribers];
oosmos_sSubscriberList m_OpenEvent[swMaxOpenSubscribers];
};

extern sw * swNewDetached(pin * pPin)
{
oosmos_Allocate(pSwitch, sw, swMaxSwitches, NULL);

pSwitch->m_pPin = pPin;
pSwitch->m_State = Unknown_State;

oosmos_SubscriberListInit(pSwitch->m_CloseEvent);
oosmos_SubscriberListInit(pSwitch->m_OpenEvent);

return pSwitch;
}

extern sw * swNew(pin * pPin)	[...]
{
sw * pSwitch = swNewDetached(pPin);

oosmos_ActiveObjectInit(pSwitch, m_ActiveObject, swRunStateMachine);

return pSwitch;
}

extern void swSubscribeCloseEvent(sw * pSwitch, oosmos_sQueue * pQueue, int CloseEventCode, void * pContext)
{
oosmos_POINTER_GUARD(pSwitch);

oosmos_SubscriberListAdd(pSwitch->m_CloseEvent, pQueue, CloseEventCode, pContext);
}

extern void swSubscribeOpenEvent(sw * pSwitch, oosmos_sQueue * pQueue, int OpenEventCode, void * pContext)	[...]
{
oosmos_POINTER_GUARD(pSwitch);

oosmos_SubscriberListAdd(pSwitch->m_OpenEvent, pQueue, OpenEventCode, pContext);
}

static eStates PhysicalSwitchState(const sw * pSwitch)
{
oosmos_POINTER_GUARD(pSwitch);

return pinIsOn(pSwitch->m_pPin) ? Closed_State : Open_State;
}

extern bool swIsOpen(const sw * pSwitch)
{
return !swIsClosed(pSwitch);
}

extern bool swIsClosed(const sw * pSwitch)
{
oosmos_POINTER_GUARD(pSwitch);

if (pSwitch->m_State == Unknown_State) {
return PhysicalSwitchState(pSwitch) == Closed_State;
}

return pSwitch->m_State == Closed_State;
}

extern void swRunStateMachine(sw * pSwitch)
{
oosmos_POINTER_GUARD(pSwitch);

switch (pSwitch->m_State) {
case Open_State: {
if (pinIsOn(pSwitch->m_pPin)) {
pSwitch->m_State = Closed_State;
oosmos_SubscriberListNotify(pSwitch->m_CloseEvent);
}

break;
}
case Closed_State: {
if (pinIsOff(pSwitch->m_pPin)) {
pSwitch->m_State = Open_State;
oosmos_SubscriberListNotify(pSwitch->m_OpenEvent);
}

break;
}
case Unknown_State: {
pSwitch->m_State = pinIsOn(pSwitch->m_pPin) ? Closed_State : Open_State;
break;
}
}
}

oosmos/Classes/sw.c

Called by a publisher, oosmos_SubscriberListNotifyWithArgs notifies all subscribers of the occurrence of an event and passes additional arguments that the subscriber can use.
See line 113 in the code snippet below for an example.

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void oosmos_SubscriberListNotifyWithArgs(SubscriberList, Event);

Prototype

SubscriberList	The `oosmos_sSubscriberList` array member inside an `OOSMOS` object. Must be the array itself, not a pointer to it — the macro computes the number of elements from the array.
Event	The event to publish, passed by name, not by address — the macro takes the event's address and size itself. Can be a user-defined event structure whose first member is an `oosmos_sEvent`.
See Also	`SubscriberListAdd`, `SubscriberListInit`, `SubscriberListNotify`, `sSubscriberList`

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//	[MIT]
// OOSMOS uart Class
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#include "oosmos.h"	[...]
#include "uart.h"
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <stdarg.h>

typedef enum
{
sendAwaitingCharToSend_State,
sendAwaitingReady_State,
sendAwaitingComplete_State
} eSendStates;

struct uartTag
{
oosmos_sActiveObject m_ActiveObject;

oosmos_sQueue m_SendDataQueue;
uint8_t m_SendDataQueueData[200];
eSendStates m_SendState;
uint8_t m_CharToSend;

oosmos_sQueue m_ReceiveDataQueue;
uint8_t m_ReceiveDataQueueData[10];
oosmos_sSubscriberList m_ReceivedByteEventSubscribers[1];

uint8_t m_PlibUartID;
uint8_t m_UartModule;
};

#if defined _UART6
#define MaxUARTS 6
#elif defined _UART5
#define MaxUARTS 5
#elif defined _UART4
#define MaxUARTS 4
#elif defined _UART3
#define MaxUARTS 3
#elif defined _UART2
#define MaxUARTS 2
#elif defined _UART1
#define MaxUARTS 1
#endif

static uart UartList[MaxUARTS];
static unsigned UartCount;

static const unsigned UartIndex_to_PlibUartId[] =
{
#ifdef _UART1
UART1,
#endif
#ifdef _UART2
UART2,
#endif
#ifdef _UART3
UART3,
#endif
#ifdef _UART4
UART4,
#endif
#ifdef _UART5
UART5,
#endif
#ifdef _UART6
UART6,
#endif
};

static void EnableInterrupt(uart * pUART)
{
INTEnable(INT_SOURCE_UART_RX(pUART->m_PlibUartID), INT_ENABLED);
}

static void DisableInterrupt(uart * pUART)
{
INTEnable(INT_SOURCE_UART_RX(pUART->m_PlibUartID), INT_DISABLED);
}

static uint16_t GetPriorityBits(const unsigned PriorityNumber)
{
switch (PriorityNumber) {
case 1: return INT_PRIORITY_LEVEL_1;
case 2: return INT_PRIORITY_LEVEL_2;
case 3: return INT_PRIORITY_LEVEL_3;
case 4: return INT_PRIORITY_LEVEL_4;
case 5: return INT_PRIORITY_LEVEL_5;
case 6: return INT_PRIORITY_LEVEL_6;
case 7: return INT_PRIORITY_LEVEL_7;
default: oosmos_FOREVER();
}
}

static void RunReceiverStateMachine(void * pObject)
{
uart * pUART = (uart *) pObject;
uint8_t Byte;

DisableInterrupt(pUART);
const bool PopSuccess = oosmos_QueuePop(&pUART->m_ReceiveDataQueue, &Byte, sizeof(Byte));
EnableInterrupt(pUART);

if (PopSuccess) {
uart_sReceivedByteEvent ReceivedByteEvent = { oosmos_EMPTY_EVENT, Byte };
oosmos_SubscriberListNotifyWithArgs(pUART->m_ReceivedByteEventSubscribers, ReceivedByteEvent);
}
}

static void RunSenderStateMachine(void * pObject)	[...]
{
uart * pUART = (uart *) pObject;

switch (pUART->m_SendState) {
case sendAwaitingCharToSend_State: {
const bool PopSuccess = oosmos_QueuePop(&pUART->m_SendDataQueue, &pUART->m_CharToSend, sizeof(pUART->m_CharToSend));

if (PopSuccess)
pUART->m_SendState = sendAwaitingReady_State;

break;
}
case sendAwaitingReady_State: {
if (UARTTransmitterIsReady(pUART->m_PlibUartID)) {
UARTSendDataByte(pUART->m_PlibUartID, pUART->m_CharToSend);
pUART->m_SendState = sendAwaitingComplete_State;
}

break;
}
case sendAwaitingComplete_State: {
if (UARTTransmissionHasCompleted(pUART->m_PlibUartID))
pUART->m_SendState = sendAwaitingCharToSend_State;

break;
}
}
}

static void RunStateMachine(void * pObject)
{
RunSenderStateMachine(pObject);
RunReceiverStateMachine(pObject);
}

static void ISR(const unsigned UartModule)
{
uart * pUART = UartList;

for (unsigned Count = 1; Count <= UartCount; pUART++, Count++) {
if (UartModule <= pUART->m_UartModule) {
break;
}
}

const unsigned PlibUartId = pUART->m_PlibUartID;

if (INTGetFlag(INT_SOURCE_UART_RX(PlibUartId))) {
while (UARTReceivedDataIsAvailable(PlibUartId)) {
const uint8_t Byte = UARTGetDataByte(PlibUartId);
oosmos_QueuePush(&pUART->m_ReceiveDataQueue, &Byte, sizeof(Byte));
}

INTClearFlag(INT_SOURCE_UART_RX(PlibUartId));
}
}

static uint32_t GetPeripheralClock(void)
{
return (oosmos_GetClockSpeedInMHz()*1000000) / (1 << OSCCONbits.PBDIV);
}

extern void uartPrintf(uart * pUART, const char * pFormat, ...)
{
char Buffer[100];
va_list ArgList;

va_start(ArgList, pFormat);
vsprintf(Buffer, pFormat, ArgList);
uartSendString(pUART, Buffer);
}

extern void uartSendChar(uart * pUART, const char Char)
{
oosmos_QueuePush(&pUART->m_SendDataQueue, &Char, sizeof(Char));
}

extern void uartSendString(uart * pUART, const char * pString)
{
uint8_t Char;

while (Char = *pString++, Char) {
uartSendChar(pUART, Char);
}
}

extern void uartStart(uart * pUART)
{
const unsigned PlibUartId = pUART->m_PlibUartID;

UARTEnable(PlibUartId, UART_ENABLE_FLAGS(UART_PERIPHERAL \| UART_RX \| UART_TX));
EnableInterrupt(pUART);
}

//
// 'UartModule' is 1, 2, etc.
//
extern uart * uartNew(const unsigned UartModule, const unsigned BaudRate)
{
oosmos_AllocateVisible(pUART, uart, UartList, UartCount, MaxUARTS, NULL);

pUART->m_UartModule = UartModule;

const unsigned PlibUartID = UartIndex_to_PlibUartId[UartModule-1];
pUART->m_PlibUartID = PlibUartID;

UARTConfigure(PlibUartID, UART_ENABLE_PINS_TX_RX_ONLY);
UARTSetFifoMode(PlibUartID, UART_INTERRUPT_ON_TX_NOT_FULL \| UART_INTERRUPT_ON_RX_NOT_EMPTY);
UARTSetLineControl(PlibUartID, UART_DATA_SIZE_8_BITS \| UART_PARITY_NONE \| UART_STOP_BITS_1);
UARTSetDataRate(PlibUartID, GetPeripheralClock(), BaudRate);

const unsigned Priority = 1;
INTSetVectorPriority(INT_VECTOR_UART(PlibUartID), GetPriorityBits(Priority));
INTSetVectorSubPriority(INT_VECTOR_UART(PlibUartID), INT_SUB_PRIORITY_LEVEL_0);

oosmos_QueueConstruct(&pUART->m_SendDataQueue, pUART->m_SendDataQueueData, sizeof(pUART->m_SendDataQueueData), sizeof(uint8_t));

oosmos_QueueConstruct(&pUART->m_ReceiveDataQueue, pUART->m_ReceiveDataQueueData, sizeof(pUART->m_ReceiveDataQueueData), sizeof(uint8_t));
oosmos_SubscriberListInit(pUART->m_ReceivedByteEventSubscribers);

oosmos_ActiveObjectInit(pUART, m_ActiveObject, RunStateMachine);

return pUART;
}

extern void uartSubscribe(uart * pUART, oosmos_sQueue * pQueue, const int EventCode, void * pContext)
{
oosmos_SubscriberListAdd(pUART->m_ReceivedByteEventSubscribers, pQueue, EventCode, pContext);
}

#define uartVector(N) void __ISR(_UART_##N##_VECTOR) IntUart##N##Handler() { ISR(N); }

#ifdef _UART1
uartVector(1)
#endif

#ifdef _UART2
uartVector(2)
#endif

#ifdef _UART3
uartVector(3)
#endif

#ifdef _UART4
uartVector(4)
#endif

#ifdef _UART5
uartVector(5)
#endif

#ifdef _UART6
uartVector(6)
#endif

oosmos/Classes/PIC32/uart.c

oosmos_ThreadBegin and oosmos_ThreadEnd bracket OOSMOS Thread calls within an oosmos_POLL event handler.
See line 35 in the code snippet below for an example.

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void oosmos_ThreadBegin();

Prototype

See Also

ThreadDelayMS, ThreadDelaySeconds, ThreadDelayUS, ThreadEnd, ThreadExit, ThreadFinally, ThreadWaitCond, ThreadWaitCond_TimeoutMS, ThreadWaitEvent, ThreadWaitEvent_TimeoutMS, ThreadYield

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//	[MIT]
// OOSMOS toggle Class
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#ifndef toggleMAX	[...]
#define toggleMAX 5
#endif

//===================================

#include "oosmos.h"
#include "pin.h"
#include "toggle.h"
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>

struct toggleTag
{
oosmos_sObjectThread m_ObjectThread;

pin * m_pPin;
uint32_t m_TimeOnMS;
uint32_t m_TimeOffMS;
};

static void ToggleThread(const toggle * pToggle, oosmos_sState * pState)
{
oosmos_POINTER_GUARD(pToggle);
oosmos_POINTER_GUARD(pState);

oosmos_ThreadBegin();
for (;;) {
pinOn(pToggle->m_pPin);
oosmos_ThreadDelayMS(pToggle->m_TimeOnMS);

pinOff(pToggle->m_pPin);
oosmos_ThreadDelayMS(pToggle->m_TimeOffMS);
}
oosmos_ThreadEnd();
}
	[...]
extern toggle * toggleNew(pin * pPin, uint32_t TimeOnMS, uint32_t TimeOffMS)
{
oosmos_Allocate(pToggle, toggle, toggleMAX, NULL);

oosmos_ObjectThreadInit(pToggle, m_ObjectThread, ToggleThread, true);

pToggle->m_pPin = pPin;
pToggle->m_TimeOnMS = TimeOnMS;
pToggle->m_TimeOffMS = TimeOffMS;

return pToggle;
}

oosmos/Classes/toggle.c

oosmos_ThreadDelayMS blocks the thread for the specified number of Milliseconds.
See line 38 in the code snippet below for an example.

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void oosmos_ThreadDelayMS(uint32_t Milliseconds);

Prototype

Milliseconds	The number of milliseconds to block the thread.
See Also	`ThreadBegin`, `ThreadDelaySeconds`, `ThreadDelayUS`, `ThreadEnd`, `ThreadExit`, `ThreadFinally`, `ThreadWaitCond`, `ThreadWaitCond_TimeoutMS`, `ThreadWaitEvent`, `ThreadWaitEvent_TimeoutMS`, `ThreadYield`

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//	[MIT]
// OOSMOS toggle Class
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#ifndef toggleMAX	[...]
#define toggleMAX 5
#endif

//===================================

#include "oosmos.h"
#include "pin.h"
#include "toggle.h"
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>

struct toggleTag
{
oosmos_sObjectThread m_ObjectThread;

pin * m_pPin;
uint32_t m_TimeOnMS;
uint32_t m_TimeOffMS;
};

static void ToggleThread(const toggle * pToggle, oosmos_sState * pState)
{
oosmos_POINTER_GUARD(pToggle);
oosmos_POINTER_GUARD(pState);

oosmos_ThreadBegin();
for (;;) {
pinOn(pToggle->m_pPin);
oosmos_ThreadDelayMS(pToggle->m_TimeOnMS);

pinOff(pToggle->m_pPin);
oosmos_ThreadDelayMS(pToggle->m_TimeOffMS);
}
oosmos_ThreadEnd();
}

extern toggle * toggleNew(pin * pPin, uint32_t TimeOnMS, uint32_t TimeOffMS)	[...]
{
oosmos_Allocate(pToggle, toggle, toggleMAX, NULL);

oosmos_ObjectThreadInit(pToggle, m_ObjectThread, ToggleThread, true);

pToggle->m_pPin = pPin;
pToggle->m_TimeOnMS = TimeOnMS;
pToggle->m_TimeOffMS = TimeOffMS;

return pToggle;
}

oosmos/Classes/toggle.c

oosmos_ThreadDelaySeconds blocks the thread for the specified number of Seconds.
See line 24 in the code snippet below for an example.

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void oosmos_ThreadDelaySeconds(uint32_t Seconds);

Prototype

Seconds	The number of seconds to block the thread.
See Also	`ThreadBegin`, `ThreadDelayMS`, `ThreadDelayUS`, `ThreadEnd`, `ThreadExit`, `ThreadFinally`, `ThreadWaitCond`, `ThreadWaitCond_TimeoutMS`, `ThreadWaitEvent`, `ThreadWaitEvent_TimeoutMS`, `ThreadYield`

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//	[MIT]
// OOSMOS ThreadDelaySeconds Test
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#include "oosmos.h"	[...]
#include <stdint.h>
#include <stdio.h>

typedef struct
{
oosmos_sObjectThread m_ObjectThread;
} test;

static void Thread(test * pTest, oosmos_sState * pState)
{
oosmos_UNUSED(pTest);

oosmos_ThreadBegin();
printf("Wait for 3 seconds...\n");

oosmos_ThreadDelaySeconds(3);

printf("Done. Press CNTL-C to exit.\n");
oosmos_ThreadEnd();
}

extern int main(void)	[...]
{
oosmos_Allocate(pTest, test, 1, NULL);

oosmos_ObjectThreadInit(pTest, m_ObjectThread, Thread, true);

for (;;) {
oosmos_RunStateMachines();
}
}

oosmos/Tests/ThreadDelaySeconds.c

oosmos_ThreadDelayUS blocks the thread for the specified number of Microseconds.
See line 29 in the code snippet below for an example.

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void oosmos_ThreadDelayUS(uint32_t Microseconds);

Prototype

Microseconds	The number of microseconds to block the thread.
See Also	`ThreadBegin`, `ThreadDelayMS`, `ThreadDelaySeconds`, `ThreadEnd`, `ThreadExit`, `ThreadFinally`, `ThreadWaitCond`, `ThreadWaitCond_TimeoutMS`, `ThreadWaitEvent`, `ThreadWaitEvent_TimeoutMS`, `ThreadYield`

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//	[MIT]
// OOSMOS ThreadDelayUS Test
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#include "oosmos.h"	[...]
#include <stdint.h>
#include <stdio.h>

typedef struct
{
oosmos_sObjectThread m_ObjectThread;
unsigned I;
uint32_t Before;
uint32_t After;
uint32_t Diff;
} test;

static void Thread(test * pTest, oosmos_sState * pState)
{
oosmos_ThreadBegin();
printf("Starting Thread\n");

pTest->Before = oosmos_GetFreeRunningUS();

for (pTest->I = 1; pTest->I <= 5; pTest->I++) {
oosmos_ThreadDelayUS(1000);
}

pTest->After = oosmos_GetFreeRunningUS();

pTest->Diff = pTest->After - pTest->Before;

printf("Diff: %u %u %u\n", (unsigned) pTest->Diff, (unsigned) pTest->Before, (unsigned) pTest->After);

if (pTest->Diff >= 5000 && pTest->Diff <= 5100) {
printf("Success\n");
}
else {
printf("Failed\n");
}

printf("Press CNTL-C to exit.\n");
oosmos_ThreadEnd();
}

extern int main(void)	[...]
{
oosmos_Allocate(pTest, test, 1, NULL);

oosmos_ObjectThreadInit(pTest, m_ObjectThread, Thread, true);

for (;;) {
oosmos_RunStateMachines();
}
}

oosmos/Tests/ThreadDelayUS.c

oosmos_ThreadBegin and oosmos_ThreadEnd bracket OOSMOS Thread calls within an oosmos_POLL event handler.
See line 43 in the code snippet below for an example.

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void oosmos_ThreadEnd();

Prototype

See Also

ThreadBegin, ThreadDelayMS, ThreadDelaySeconds, ThreadDelayUS, ThreadExit, ThreadFinally, ThreadWaitCond, ThreadWaitCond_TimeoutMS, ThreadWaitEvent, ThreadWaitEvent_TimeoutMS, ThreadYield

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//	[MIT]
// OOSMOS toggle Class
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#ifndef toggleMAX	[...]
#define toggleMAX 5
#endif

//===================================

#include "oosmos.h"
#include "pin.h"
#include "toggle.h"
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>

struct toggleTag
{
oosmos_sObjectThread m_ObjectThread;

pin * m_pPin;
uint32_t m_TimeOnMS;
uint32_t m_TimeOffMS;
};

static void ToggleThread(const toggle * pToggle, oosmos_sState * pState)
{
oosmos_POINTER_GUARD(pToggle);
oosmos_POINTER_GUARD(pState);

oosmos_ThreadBegin();
for (;;) {
pinOn(pToggle->m_pPin);
oosmos_ThreadDelayMS(pToggle->m_TimeOnMS);

pinOff(pToggle->m_pPin);
oosmos_ThreadDelayMS(pToggle->m_TimeOffMS);
}
oosmos_ThreadEnd();
}
	[...]
extern toggle * toggleNew(pin * pPin, uint32_t TimeOnMS, uint32_t TimeOffMS)
{
oosmos_Allocate(pToggle, toggle, toggleMAX, NULL);

oosmos_ObjectThreadInit(pToggle, m_ObjectThread, ToggleThread, true);

pToggle->m_pPin = pPin;
pToggle->m_TimeOnMS = TimeOnMS;
pToggle->m_TimeOffMS = TimeOffMS;

return pToggle;
}

oosmos/Classes/toggle.c

oosmos_ThreadExit exits the thread. If there is an oosmos_ThreadFinally() function between the oosmos_ThreadExit and the oosmos_ThreadEnd, the code in the Finally block will be executed prior to exiting the thread.
See line 167 in the code snippet below for an example.

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void oosmos_ThreadExit();

Prototype

See Also

ThreadBegin, ThreadDelayMS, ThreadDelaySeconds, ThreadDelayUS, ThreadEnd, ThreadFinally, ThreadWaitCond, ThreadWaitCond_TimeoutMS, ThreadWaitEvent, ThreadWaitEvent_TimeoutMS, ThreadYield

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//	[MIT]
// OOSMOS threadtest Class
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#include "oosmos.h"	[...]
#include "prt.h"
#include "threadtest.h"
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>

//
// Adjust this in order to preallocate all 'threadtest' objects.
// Use 1 for a memory constrained environment.
//
#ifndef MAX_THREADTEST
#define MAX_THREADTEST 10
#endif

//>>>EVENTS
enum {
evDone = 1,
evPrint = 2
};

#ifdef oosmos_DEBUG
static const char * OOSMOS_EventNames(int EventCode)
{
switch (EventCode) {
case evDone: return "evDone";
case evPrint: return "evPrint";
default: return "";
}
}
#endif
//<<<EVENTS

typedef union {
oosmos_sEvent Base;
} uEvents;

struct threadtestTag
{
//>>>DECL
oosmos_sStateMachine(ROOT, uEvents, 3);
oosmos_sOrtho Running_State;
oosmos_sOrthoRegion Running_Region1_State;
oosmos_sLeaf Running_Region1_DelayMS_State;
oosmos_sLeaf Running_Region1_WaitCond_State;
oosmos_sLeaf Running_Region1_WaitCond_TimeoutMS_State;
oosmos_sLeaf Running_Region1_WaitEvent_State;
oosmos_sLeaf Running_Region1_WaitEvent_TimeoutMS_State;
oosmos_sLeaf Running_Region1_ThreadExit_State;
oosmos_sLeaf Running_Region1_ThreadExitFinally_State;
oosmos_sLeaf Running_Region1_Exiting_State;
oosmos_sOrthoRegion Running_Region2_State;
oosmos_sLeaf Running_Region2_Printing_State;
//<<<DECL
unsigned m_WC_Timeout_Successes;
unsigned m_WE_Timeout_Successes;

unsigned m_ThreadExitCount;
};

static bool ConditionRandom(int Range)
{
return rand() % Range == 0;
}

static bool ConditionTrue(void)
{
return true;
}

static bool ConditionFalse(void)
{
return false;
}

static void DelayMS_Thread(threadtest * pThreadTest, oosmos_sState * pState)
{
oosmos_UNUSED(pThreadTest);

oosmos_ThreadBegin();
prtFormatted("ThreadDelayMS...\n");
oosmos_ThreadDelayMS(3000);
prtFormatted("ThreadDelayMS SUCCESS\n\n");
oosmos_ThreadEnd();
}

static void WaitCond_Thread(threadtest * pThreadTest, oosmos_sState * pState)
{
oosmos_ThreadBegin();
prtFormatted("ThreadWaitCond...\n");
oosmos_ThreadWaitCond(ConditionRandom(2));
prtFormatted("ThreadWaitCond SUCCESS\n\n");
oosmos_UNUSED(pThreadTest);
oosmos_ThreadEnd();
}

static void WaitCond_TimeoutMS_Thread(threadtest * pThreadTest, oosmos_sState * pState)
{
oosmos_ThreadBegin();
bool TimedOut = false;
pThreadTest->m_WC_Timeout_Successes = 0;

prtFormatted("ThreadWaitCond_TimeoutMS...\n");

oosmos_ThreadWaitCond_TimeoutMS(ConditionTrue(), 100, &TimedOut);
pThreadTest->m_WC_Timeout_Successes += (TimedOut == false);

oosmos_ThreadWaitCond_TimeoutMS(ConditionFalse(), 100, &TimedOut);
pThreadTest->m_WC_Timeout_Successes += (TimedOut == true);
prtFormatted("ThreadWaitCond_TimeoutMS %s\n\n", pThreadTest->m_WC_Timeout_Successes == 2 ? "SUCCESS" : "FAILURE");
oosmos_ThreadEnd();
}

static void WaitEvent_Thread(threadtest * pThreadTest, oosmos_sState * pState)
{
oosmos_ThreadBegin();
prtFormatted("ThreadWaitEvent...\n");

oosmos_PushEventCode(pThreadTest, evPrint);
oosmos_ThreadWaitEvent(evDone);
prtFormatted("ThreadWaitEvent SUCCESS\n\n");
oosmos_ThreadEnd();
}

static void WaitEvent_TimeoutMS_Thread(threadtest * pThreadTest, oosmos_sState * pState)
{
oosmos_ThreadBegin();
bool TimedOut = false;
pThreadTest->m_WE_Timeout_Successes = 0;

prtFormatted("ThreadWaitEvent_TimeoutMS...\n");

oosmos_PushEventCode(pThreadTest, evPrint);
oosmos_ThreadWaitEvent_TimeoutMS(evPrint, 100, &TimedOut);
pThreadTest->m_WE_Timeout_Successes += (TimedOut == false);

oosmos_ThreadWaitEvent_TimeoutMS(evPrint, 100, &TimedOut);
pThreadTest->m_WE_Timeout_Successes += (TimedOut == true);
prtFormatted("ThreadWaitEvent_TimeoutMS %s\n\n", pThreadTest->m_WE_Timeout_Successes == 2 ? "SUCCESS" : "FAILURE");
oosmos_ThreadEnd();
}

static void ThreadExit_Thread(threadtest * pThreadTest, oosmos_sState * pState)
{
oosmos_ThreadBegin();
pThreadTest->m_ThreadExitCount = 0;
oosmos_ThreadYield();
pThreadTest->m_ThreadExitCount++;
prtFormatted("ThreadExit SUCCESS\n");
oosmos_ThreadExit();
oosmos_ThreadEnd();
}

static void ThreadExitFinally_Thread(threadtest * pThreadTest, oosmos_sState * pState)
{
oosmos_ThreadBegin();
pThreadTest->m_ThreadExitCount = 0;
oosmos_ThreadYield();
pThreadTest->m_ThreadExitCount++;
oosmos_ThreadExit();
oosmos_ThreadFinally();
pThreadTest->m_ThreadExitCount++;

if (pThreadTest->m_ThreadExitCount == 2) {
prtFormatted("ThreadExitFinally SUCCESS\n");
} else {
prtFormatted("ThreadExitFinally FAILURE\n");
}
oosmos_ThreadEnd();
}

//>>>CODE	[...]
static bool Running_Region1_DelayMS_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
threadtest * pThreadTest = (threadtest *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_POLL: {
DelayMS_Thread(pThreadTest, pState);
return true;
}
case oosmos_COMPLETE: {
return oosmos_Transition(pThreadTest, pState, Running_Region1_WaitCond_State);
}
}

return false;
}

static bool Running_Region1_WaitCond_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
threadtest * pThreadTest = (threadtest *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_POLL: {
WaitCond_Thread(pThreadTest, pState);
return true;
}
case oosmos_COMPLETE: {
return oosmos_Transition(pThreadTest, pState, Running_Region1_WaitCond_TimeoutMS_State);
}
}

return false;
}

static bool Running_Region1_WaitCond_TimeoutMS_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
threadtest * pThreadTest = (threadtest *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_POLL: {
WaitCond_TimeoutMS_Thread(pThreadTest, pState);
return true;
}
case oosmos_COMPLETE: {
return oosmos_Transition(pThreadTest, pState, Running_Region1_WaitEvent_State);
}
}

return false;
}

static bool Running_Region1_WaitEvent_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
threadtest * pThreadTest = (threadtest *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_POLL: {
WaitEvent_Thread(pThreadTest, pState);
return true;
}
case oosmos_COMPLETE: {
return oosmos_Transition(pThreadTest, pState, Running_Region1_WaitEvent_TimeoutMS_State);
}
}

return false;
}

static bool Running_Region1_WaitEvent_TimeoutMS_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
threadtest * pThreadTest = (threadtest *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_POLL: {
WaitEvent_TimeoutMS_Thread(pThreadTest, pState);
return true;
}
case oosmos_COMPLETE: {
return oosmos_Transition(pThreadTest, pState, Running_Region1_ThreadExit_State);
}
}

return false;
}

static bool Running_Region1_ThreadExit_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
threadtest * pThreadTest = (threadtest *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_POLL: {
ThreadExit_Thread(pThreadTest, pState);
return true;
}
case oosmos_COMPLETE: {
return oosmos_Transition(pThreadTest, pState, Running_Region1_ThreadExitFinally_State);
}
}

return false;
}

static bool Running_Region1_ThreadExitFinally_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
threadtest * pThreadTest = (threadtest *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_POLL: {
ThreadExitFinally_Thread(pThreadTest, pState);
return true;
}
case oosmos_COMPLETE: {
return oosmos_Transition(pThreadTest, pState, Running_Region1_Exiting_State);
}
}

return false;
}

static bool Running_Region1_Exiting_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
switch (oosmos_EventCode(pEvent)) {
case oosmos_ENTER: {
oosmos_EndProgram(1);
return true;
}
}

oosmos_UNUSED(pObject);
oosmos_UNUSED(pState);
return false;
}

static void OOSMOS_Action_2e6a8ac5(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
threadtest * pThreadTest = (threadtest *) pObject;

printf("Printing...\n");
oosmos_PushEventCode(pThreadTest, evDone);

oosmos_UNUSED(pState);
oosmos_UNUSED(pEvent);
}

static bool Running_Region2_Printing_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
threadtest * pThreadTest = (threadtest *) pObject;

switch (oosmos_EventCode(pEvent)) {
case evPrint: {
return oosmos_TransitionAction(pThreadTest, pState, Running_Region2_Printing_State, pEvent, OOSMOS_Action_2e6a8ac5);
}
}

return false;
}
//<<<CODE

extern threadtest * threadtestNew(void)
{
oosmos_Allocate(pThreadTest, threadtest, MAX_THREADTEST, NULL);

//>>>INIT
oosmos_StateMachineInit(pThreadTest, ROOT, NULL, Running_State);
oosmos_OrthoInit(pThreadTest, Running_State, ROOT, NULL);
oosmos_OrthoRegionInit(pThreadTest, Running_Region1_State, Running_State, Running_Region1_DelayMS_State, NULL);
oosmos_LeafInit(pThreadTest, Running_Region1_DelayMS_State, Running_Region1_State, Running_Region1_DelayMS_State_Code);
oosmos_LeafInit(pThreadTest, Running_Region1_WaitCond_State, Running_Region1_State, Running_Region1_WaitCond_State_Code);
oosmos_LeafInit(pThreadTest, Running_Region1_WaitCond_TimeoutMS_State, Running_Region1_State, Running_Region1_WaitCond_TimeoutMS_State_Code);
oosmos_LeafInit(pThreadTest, Running_Region1_WaitEvent_State, Running_Region1_State, Running_Region1_WaitEvent_State_Code);
oosmos_LeafInit(pThreadTest, Running_Region1_WaitEvent_TimeoutMS_State, Running_Region1_State, Running_Region1_WaitEvent_TimeoutMS_State_Code);
oosmos_LeafInit(pThreadTest, Running_Region1_ThreadExit_State, Running_Region1_State, Running_Region1_ThreadExit_State_Code);
oosmos_LeafInit(pThreadTest, Running_Region1_ThreadExitFinally_State, Running_Region1_State, Running_Region1_ThreadExitFinally_State_Code);
oosmos_LeafInit(pThreadTest, Running_Region1_Exiting_State, Running_Region1_State, Running_Region1_Exiting_State_Code);
oosmos_OrthoRegionInit(pThreadTest, Running_Region2_State, Running_State, Running_Region2_Printing_State, NULL);
oosmos_LeafInit(pThreadTest, Running_Region2_Printing_State, Running_Region2_State, Running_Region2_Printing_State_Code);

oosmos_Debug(pThreadTest, OOSMOS_EventNames);
//<<<INIT

return pThreadTest;
}

oosmos/Classes/Tests/threadtest.c

oosmos_ThreadFinally is an optional construct that begins a section of code to be executed before exiting the Thread block.
oosmos_ThreadFinally and its code must be placed immediately before the oosmos_ThreadEnd.
See threadtest.c, below, line 168 for an example.

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void oosmos_ThreadFinally();

Prototype

See Also

ThreadBegin, ThreadDelayMS, ThreadDelaySeconds, ThreadDelayUS, ThreadEnd, ThreadExit, ThreadWaitCond, ThreadWaitCond_TimeoutMS, ThreadWaitEvent, ThreadWaitEvent_TimeoutMS, ThreadYield

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//	[MIT]
// OOSMOS threadtest Class
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#include "oosmos.h"	[...]
#include "prt.h"
#include "threadtest.h"
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>

//
// Adjust this in order to preallocate all 'threadtest' objects.
// Use 1 for a memory constrained environment.
//
#ifndef MAX_THREADTEST
#define MAX_THREADTEST 10
#endif

//>>>EVENTS
enum {
evDone = 1,
evPrint = 2
};

#ifdef oosmos_DEBUG
static const char * OOSMOS_EventNames(int EventCode)
{
switch (EventCode) {
case evDone: return "evDone";
case evPrint: return "evPrint";
default: return "";
}
}
#endif
//<<<EVENTS

typedef union {
oosmos_sEvent Base;
} uEvents;

struct threadtestTag
{
//>>>DECL
oosmos_sStateMachine(ROOT, uEvents, 3);
oosmos_sOrtho Running_State;
oosmos_sOrthoRegion Running_Region1_State;
oosmos_sLeaf Running_Region1_DelayMS_State;
oosmos_sLeaf Running_Region1_WaitCond_State;
oosmos_sLeaf Running_Region1_WaitCond_TimeoutMS_State;
oosmos_sLeaf Running_Region1_WaitEvent_State;
oosmos_sLeaf Running_Region1_WaitEvent_TimeoutMS_State;
oosmos_sLeaf Running_Region1_ThreadExit_State;
oosmos_sLeaf Running_Region1_ThreadExitFinally_State;
oosmos_sLeaf Running_Region1_Exiting_State;
oosmos_sOrthoRegion Running_Region2_State;
oosmos_sLeaf Running_Region2_Printing_State;
//<<<DECL
unsigned m_WC_Timeout_Successes;
unsigned m_WE_Timeout_Successes;

unsigned m_ThreadExitCount;
};

static bool ConditionRandom(int Range)
{
return rand() % Range == 0;
}

static bool ConditionTrue(void)
{
return true;
}

static bool ConditionFalse(void)
{
return false;
}

static void DelayMS_Thread(threadtest * pThreadTest, oosmos_sState * pState)
{
oosmos_UNUSED(pThreadTest);

oosmos_ThreadBegin();
prtFormatted("ThreadDelayMS...\n");
oosmos_ThreadDelayMS(3000);
prtFormatted("ThreadDelayMS SUCCESS\n\n");
oosmos_ThreadEnd();
}

static void WaitCond_Thread(threadtest * pThreadTest, oosmos_sState * pState)
{
oosmos_ThreadBegin();
prtFormatted("ThreadWaitCond...\n");
oosmos_ThreadWaitCond(ConditionRandom(2));
prtFormatted("ThreadWaitCond SUCCESS\n\n");
oosmos_UNUSED(pThreadTest);
oosmos_ThreadEnd();
}

static void WaitCond_TimeoutMS_Thread(threadtest * pThreadTest, oosmos_sState * pState)
{
oosmos_ThreadBegin();
bool TimedOut = false;
pThreadTest->m_WC_Timeout_Successes = 0;

prtFormatted("ThreadWaitCond_TimeoutMS...\n");

oosmos_ThreadWaitCond_TimeoutMS(ConditionTrue(), 100, &TimedOut);
pThreadTest->m_WC_Timeout_Successes += (TimedOut == false);

oosmos_ThreadWaitCond_TimeoutMS(ConditionFalse(), 100, &TimedOut);
pThreadTest->m_WC_Timeout_Successes += (TimedOut == true);
prtFormatted("ThreadWaitCond_TimeoutMS %s\n\n", pThreadTest->m_WC_Timeout_Successes == 2 ? "SUCCESS" : "FAILURE");
oosmos_ThreadEnd();
}

static void WaitEvent_Thread(threadtest * pThreadTest, oosmos_sState * pState)
{
oosmos_ThreadBegin();
prtFormatted("ThreadWaitEvent...\n");

oosmos_PushEventCode(pThreadTest, evPrint);
oosmos_ThreadWaitEvent(evDone);
prtFormatted("ThreadWaitEvent SUCCESS\n\n");
oosmos_ThreadEnd();
}

static void WaitEvent_TimeoutMS_Thread(threadtest * pThreadTest, oosmos_sState * pState)
{
oosmos_ThreadBegin();
bool TimedOut = false;
pThreadTest->m_WE_Timeout_Successes = 0;

prtFormatted("ThreadWaitEvent_TimeoutMS...\n");

oosmos_PushEventCode(pThreadTest, evPrint);
oosmos_ThreadWaitEvent_TimeoutMS(evPrint, 100, &TimedOut);
pThreadTest->m_WE_Timeout_Successes += (TimedOut == false);

oosmos_ThreadWaitEvent_TimeoutMS(evPrint, 100, &TimedOut);
pThreadTest->m_WE_Timeout_Successes += (TimedOut == true);
prtFormatted("ThreadWaitEvent_TimeoutMS %s\n\n", pThreadTest->m_WE_Timeout_Successes == 2 ? "SUCCESS" : "FAILURE");
oosmos_ThreadEnd();
}

static void ThreadExit_Thread(threadtest * pThreadTest, oosmos_sState * pState)
{
oosmos_ThreadBegin();
pThreadTest->m_ThreadExitCount = 0;
oosmos_ThreadYield();
pThreadTest->m_ThreadExitCount++;
prtFormatted("ThreadExit SUCCESS\n");
oosmos_ThreadExit();
oosmos_ThreadEnd();
}

static void ThreadExitFinally_Thread(threadtest * pThreadTest, oosmos_sState * pState)
{
oosmos_ThreadBegin();
pThreadTest->m_ThreadExitCount = 0;
oosmos_ThreadYield();
pThreadTest->m_ThreadExitCount++;
oosmos_ThreadExit();
oosmos_ThreadFinally();
pThreadTest->m_ThreadExitCount++;

if (pThreadTest->m_ThreadExitCount == 2) {
prtFormatted("ThreadExitFinally SUCCESS\n");
} else {
prtFormatted("ThreadExitFinally FAILURE\n");
}
oosmos_ThreadEnd();
}

//>>>CODE	[...]
static bool Running_Region1_DelayMS_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
threadtest * pThreadTest = (threadtest *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_POLL: {
DelayMS_Thread(pThreadTest, pState);
return true;
}
case oosmos_COMPLETE: {
return oosmos_Transition(pThreadTest, pState, Running_Region1_WaitCond_State);
}
}

return false;
}

static bool Running_Region1_WaitCond_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
threadtest * pThreadTest = (threadtest *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_POLL: {
WaitCond_Thread(pThreadTest, pState);
return true;
}
case oosmos_COMPLETE: {
return oosmos_Transition(pThreadTest, pState, Running_Region1_WaitCond_TimeoutMS_State);
}
}

return false;
}

static bool Running_Region1_WaitCond_TimeoutMS_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
threadtest * pThreadTest = (threadtest *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_POLL: {
WaitCond_TimeoutMS_Thread(pThreadTest, pState);
return true;
}
case oosmos_COMPLETE: {
return oosmos_Transition(pThreadTest, pState, Running_Region1_WaitEvent_State);
}
}

return false;
}

static bool Running_Region1_WaitEvent_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
threadtest * pThreadTest = (threadtest *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_POLL: {
WaitEvent_Thread(pThreadTest, pState);
return true;
}
case oosmos_COMPLETE: {
return oosmos_Transition(pThreadTest, pState, Running_Region1_WaitEvent_TimeoutMS_State);
}
}

return false;
}

static bool Running_Region1_WaitEvent_TimeoutMS_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
threadtest * pThreadTest = (threadtest *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_POLL: {
WaitEvent_TimeoutMS_Thread(pThreadTest, pState);
return true;
}
case oosmos_COMPLETE: {
return oosmos_Transition(pThreadTest, pState, Running_Region1_ThreadExit_State);
}
}

return false;
}

static bool Running_Region1_ThreadExit_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
threadtest * pThreadTest = (threadtest *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_POLL: {
ThreadExit_Thread(pThreadTest, pState);
return true;
}
case oosmos_COMPLETE: {
return oosmos_Transition(pThreadTest, pState, Running_Region1_ThreadExitFinally_State);
}
}

return false;
}

static bool Running_Region1_ThreadExitFinally_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
threadtest * pThreadTest = (threadtest *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_POLL: {
ThreadExitFinally_Thread(pThreadTest, pState);
return true;
}
case oosmos_COMPLETE: {
return oosmos_Transition(pThreadTest, pState, Running_Region1_Exiting_State);
}
}

return false;
}

static bool Running_Region1_Exiting_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
switch (oosmos_EventCode(pEvent)) {
case oosmos_ENTER: {
oosmos_EndProgram(1);
return true;
}
}

oosmos_UNUSED(pObject);
oosmos_UNUSED(pState);
return false;
}

static void OOSMOS_Action_2e6a8ac5(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
threadtest * pThreadTest = (threadtest *) pObject;

printf("Printing...\n");
oosmos_PushEventCode(pThreadTest, evDone);

oosmos_UNUSED(pState);
oosmos_UNUSED(pEvent);
}

static bool Running_Region2_Printing_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
threadtest * pThreadTest = (threadtest *) pObject;

switch (oosmos_EventCode(pEvent)) {
case evPrint: {
return oosmos_TransitionAction(pThreadTest, pState, Running_Region2_Printing_State, pEvent, OOSMOS_Action_2e6a8ac5);
}
}

return false;
}
//<<<CODE

extern threadtest * threadtestNew(void)
{
oosmos_Allocate(pThreadTest, threadtest, MAX_THREADTEST, NULL);

//>>>INIT
oosmos_StateMachineInit(pThreadTest, ROOT, NULL, Running_State);
oosmos_OrthoInit(pThreadTest, Running_State, ROOT, NULL);
oosmos_OrthoRegionInit(pThreadTest, Running_Region1_State, Running_State, Running_Region1_DelayMS_State, NULL);
oosmos_LeafInit(pThreadTest, Running_Region1_DelayMS_State, Running_Region1_State, Running_Region1_DelayMS_State_Code);
oosmos_LeafInit(pThreadTest, Running_Region1_WaitCond_State, Running_Region1_State, Running_Region1_WaitCond_State_Code);
oosmos_LeafInit(pThreadTest, Running_Region1_WaitCond_TimeoutMS_State, Running_Region1_State, Running_Region1_WaitCond_TimeoutMS_State_Code);
oosmos_LeafInit(pThreadTest, Running_Region1_WaitEvent_State, Running_Region1_State, Running_Region1_WaitEvent_State_Code);
oosmos_LeafInit(pThreadTest, Running_Region1_WaitEvent_TimeoutMS_State, Running_Region1_State, Running_Region1_WaitEvent_TimeoutMS_State_Code);
oosmos_LeafInit(pThreadTest, Running_Region1_ThreadExit_State, Running_Region1_State, Running_Region1_ThreadExit_State_Code);
oosmos_LeafInit(pThreadTest, Running_Region1_ThreadExitFinally_State, Running_Region1_State, Running_Region1_ThreadExitFinally_State_Code);
oosmos_LeafInit(pThreadTest, Running_Region1_Exiting_State, Running_Region1_State, Running_Region1_Exiting_State_Code);
oosmos_OrthoRegionInit(pThreadTest, Running_Region2_State, Running_State, Running_Region2_Printing_State, NULL);
oosmos_LeafInit(pThreadTest, Running_Region2_Printing_State, Running_Region2_State, Running_Region2_Printing_State_Code);

oosmos_Debug(pThreadTest, OOSMOS_EventNames);
//<<<INIT

return pThreadTest;
}

oosmos/Classes/Tests/threadtest.c

oosmos_ThreadWaitCond effectively blocks execution of this object until a condition is met. See line 98 in the code snippet below for an example.
This form of oosmos_ThreadWaitCond does not accept a timeout, so you must be certain that the condition will be met eventually. There are other forms of oosmos_ThreadWaitCond that do accept a timeout value.

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void oosmos_ThreadWaitCond(bool Condition);

Prototype

Condition	When this condition is `false`, `OOSMOS` returns from the function to run other objects and then re-enters this statement to check the condition again. It keeps doing this until the condition is `true`, and then execution continues to the next statement.
See Also	`ThreadBegin`, `ThreadDelayMS`, `ThreadDelaySeconds`, `ThreadDelayUS`, `ThreadEnd`, `ThreadExit`, `ThreadFinally`, `ThreadWaitCond_TimeoutMS`, `ThreadWaitEvent`, `ThreadWaitEvent_TimeoutMS`, `ThreadYield`

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//	[MIT]
// OOSMOS threadtest Class
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#include "oosmos.h"	[...]
#include "prt.h"
#include "threadtest.h"
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>

//
// Adjust this in order to preallocate all 'threadtest' objects.
// Use 1 for a memory constrained environment.
//
#ifndef MAX_THREADTEST
#define MAX_THREADTEST 10
#endif

//>>>EVENTS
enum {
evDone = 1,
evPrint = 2
};

#ifdef oosmos_DEBUG
static const char * OOSMOS_EventNames(int EventCode)
{
switch (EventCode) {
case evDone: return "evDone";
case evPrint: return "evPrint";
default: return "";
}
}
#endif
//<<<EVENTS

typedef union {
oosmos_sEvent Base;
} uEvents;

struct threadtestTag
{
//>>>DECL
oosmos_sStateMachine(ROOT, uEvents, 3);
oosmos_sOrtho Running_State;
oosmos_sOrthoRegion Running_Region1_State;
oosmos_sLeaf Running_Region1_DelayMS_State;
oosmos_sLeaf Running_Region1_WaitCond_State;
oosmos_sLeaf Running_Region1_WaitCond_TimeoutMS_State;
oosmos_sLeaf Running_Region1_WaitEvent_State;
oosmos_sLeaf Running_Region1_WaitEvent_TimeoutMS_State;
oosmos_sLeaf Running_Region1_ThreadExit_State;
oosmos_sLeaf Running_Region1_ThreadExitFinally_State;
oosmos_sLeaf Running_Region1_Exiting_State;
oosmos_sOrthoRegion Running_Region2_State;
oosmos_sLeaf Running_Region2_Printing_State;
//<<<DECL
unsigned m_WC_Timeout_Successes;
unsigned m_WE_Timeout_Successes;

unsigned m_ThreadExitCount;
};

static bool ConditionRandom(int Range)
{
return rand() % Range == 0;
}

static bool ConditionTrue(void)
{
return true;
}

static bool ConditionFalse(void)
{
return false;
}

static void DelayMS_Thread(threadtest * pThreadTest, oosmos_sState * pState)
{
oosmos_UNUSED(pThreadTest);

oosmos_ThreadBegin();
prtFormatted("ThreadDelayMS...\n");
oosmos_ThreadDelayMS(3000);
prtFormatted("ThreadDelayMS SUCCESS\n\n");
oosmos_ThreadEnd();
}

static void WaitCond_Thread(threadtest * pThreadTest, oosmos_sState * pState)
{
oosmos_ThreadBegin();
prtFormatted("ThreadWaitCond...\n");
oosmos_ThreadWaitCond(ConditionRandom(2));
prtFormatted("ThreadWaitCond SUCCESS\n\n");
oosmos_UNUSED(pThreadTest);
oosmos_ThreadEnd();
}

static void WaitCond_TimeoutMS_Thread(threadtest * pThreadTest, oosmos_sState * pState)	[...]
{
oosmos_ThreadBegin();
bool TimedOut = false;
pThreadTest->m_WC_Timeout_Successes = 0;

prtFormatted("ThreadWaitCond_TimeoutMS...\n");

oosmos_ThreadWaitCond_TimeoutMS(ConditionTrue(), 100, &TimedOut);
pThreadTest->m_WC_Timeout_Successes += (TimedOut == false);

oosmos_ThreadWaitCond_TimeoutMS(ConditionFalse(), 100, &TimedOut);
pThreadTest->m_WC_Timeout_Successes += (TimedOut == true);
prtFormatted("ThreadWaitCond_TimeoutMS %s\n\n", pThreadTest->m_WC_Timeout_Successes == 2 ? "SUCCESS" : "FAILURE");
oosmos_ThreadEnd();
}

static void WaitEvent_Thread(threadtest * pThreadTest, oosmos_sState * pState)
{
oosmos_ThreadBegin();
prtFormatted("ThreadWaitEvent...\n");

oosmos_PushEventCode(pThreadTest, evPrint);
oosmos_ThreadWaitEvent(evDone);
prtFormatted("ThreadWaitEvent SUCCESS\n\n");
oosmos_ThreadEnd();
}

static void WaitEvent_TimeoutMS_Thread(threadtest * pThreadTest, oosmos_sState * pState)
{
oosmos_ThreadBegin();
bool TimedOut = false;
pThreadTest->m_WE_Timeout_Successes = 0;

prtFormatted("ThreadWaitEvent_TimeoutMS...\n");

oosmos_PushEventCode(pThreadTest, evPrint);
oosmos_ThreadWaitEvent_TimeoutMS(evPrint, 100, &TimedOut);
pThreadTest->m_WE_Timeout_Successes += (TimedOut == false);

oosmos_ThreadWaitEvent_TimeoutMS(evPrint, 100, &TimedOut);
pThreadTest->m_WE_Timeout_Successes += (TimedOut == true);
prtFormatted("ThreadWaitEvent_TimeoutMS %s\n\n", pThreadTest->m_WE_Timeout_Successes == 2 ? "SUCCESS" : "FAILURE");
oosmos_ThreadEnd();
}

static void ThreadExit_Thread(threadtest * pThreadTest, oosmos_sState * pState)
{
oosmos_ThreadBegin();
pThreadTest->m_ThreadExitCount = 0;
oosmos_ThreadYield();
pThreadTest->m_ThreadExitCount++;
prtFormatted("ThreadExit SUCCESS\n");
oosmos_ThreadExit();
oosmos_ThreadEnd();
}

static void ThreadExitFinally_Thread(threadtest * pThreadTest, oosmos_sState * pState)
{
oosmos_ThreadBegin();
pThreadTest->m_ThreadExitCount = 0;
oosmos_ThreadYield();
pThreadTest->m_ThreadExitCount++;
oosmos_ThreadExit();
oosmos_ThreadFinally();
pThreadTest->m_ThreadExitCount++;

if (pThreadTest->m_ThreadExitCount == 2) {
prtFormatted("ThreadExitFinally SUCCESS\n");
} else {
prtFormatted("ThreadExitFinally FAILURE\n");
}
oosmos_ThreadEnd();
}

//>>>CODE
static bool Running_Region1_DelayMS_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
threadtest * pThreadTest = (threadtest *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_POLL: {
DelayMS_Thread(pThreadTest, pState);
return true;
}
case oosmos_COMPLETE: {
return oosmos_Transition(pThreadTest, pState, Running_Region1_WaitCond_State);
}
}

return false;
}

static bool Running_Region1_WaitCond_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
threadtest * pThreadTest = (threadtest *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_POLL: {
WaitCond_Thread(pThreadTest, pState);
return true;
}
case oosmos_COMPLETE: {
return oosmos_Transition(pThreadTest, pState, Running_Region1_WaitCond_TimeoutMS_State);
}
}

return false;
}

static bool Running_Region1_WaitCond_TimeoutMS_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
threadtest * pThreadTest = (threadtest *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_POLL: {
WaitCond_TimeoutMS_Thread(pThreadTest, pState);
return true;
}
case oosmos_COMPLETE: {
return oosmos_Transition(pThreadTest, pState, Running_Region1_WaitEvent_State);
}
}

return false;
}

static bool Running_Region1_WaitEvent_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
threadtest * pThreadTest = (threadtest *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_POLL: {
WaitEvent_Thread(pThreadTest, pState);
return true;
}
case oosmos_COMPLETE: {
return oosmos_Transition(pThreadTest, pState, Running_Region1_WaitEvent_TimeoutMS_State);
}
}

return false;
}

static bool Running_Region1_WaitEvent_TimeoutMS_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
threadtest * pThreadTest = (threadtest *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_POLL: {
WaitEvent_TimeoutMS_Thread(pThreadTest, pState);
return true;
}
case oosmos_COMPLETE: {
return oosmos_Transition(pThreadTest, pState, Running_Region1_ThreadExit_State);
}
}

return false;
}

static bool Running_Region1_ThreadExit_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
threadtest * pThreadTest = (threadtest *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_POLL: {
ThreadExit_Thread(pThreadTest, pState);
return true;
}
case oosmos_COMPLETE: {
return oosmos_Transition(pThreadTest, pState, Running_Region1_ThreadExitFinally_State);
}
}

return false;
}

static bool Running_Region1_ThreadExitFinally_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
threadtest * pThreadTest = (threadtest *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_POLL: {
ThreadExitFinally_Thread(pThreadTest, pState);
return true;
}
case oosmos_COMPLETE: {
return oosmos_Transition(pThreadTest, pState, Running_Region1_Exiting_State);
}
}

return false;
}

static bool Running_Region1_Exiting_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
switch (oosmos_EventCode(pEvent)) {
case oosmos_ENTER: {
oosmos_EndProgram(1);
return true;
}
}

oosmos_UNUSED(pObject);
oosmos_UNUSED(pState);
return false;
}

static void OOSMOS_Action_2e6a8ac5(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
threadtest * pThreadTest = (threadtest *) pObject;

printf("Printing...\n");
oosmos_PushEventCode(pThreadTest, evDone);

oosmos_UNUSED(pState);
oosmos_UNUSED(pEvent);
}

static bool Running_Region2_Printing_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
threadtest * pThreadTest = (threadtest *) pObject;

switch (oosmos_EventCode(pEvent)) {
case evPrint: {
return oosmos_TransitionAction(pThreadTest, pState, Running_Region2_Printing_State, pEvent, OOSMOS_Action_2e6a8ac5);
}
}

return false;
}
//<<<CODE

extern threadtest * threadtestNew(void)
{
oosmos_Allocate(pThreadTest, threadtest, MAX_THREADTEST, NULL);

//>>>INIT
oosmos_StateMachineInit(pThreadTest, ROOT, NULL, Running_State);
oosmos_OrthoInit(pThreadTest, Running_State, ROOT, NULL);
oosmos_OrthoRegionInit(pThreadTest, Running_Region1_State, Running_State, Running_Region1_DelayMS_State, NULL);
oosmos_LeafInit(pThreadTest, Running_Region1_DelayMS_State, Running_Region1_State, Running_Region1_DelayMS_State_Code);
oosmos_LeafInit(pThreadTest, Running_Region1_WaitCond_State, Running_Region1_State, Running_Region1_WaitCond_State_Code);
oosmos_LeafInit(pThreadTest, Running_Region1_WaitCond_TimeoutMS_State, Running_Region1_State, Running_Region1_WaitCond_TimeoutMS_State_Code);
oosmos_LeafInit(pThreadTest, Running_Region1_WaitEvent_State, Running_Region1_State, Running_Region1_WaitEvent_State_Code);
oosmos_LeafInit(pThreadTest, Running_Region1_WaitEvent_TimeoutMS_State, Running_Region1_State, Running_Region1_WaitEvent_TimeoutMS_State_Code);
oosmos_LeafInit(pThreadTest, Running_Region1_ThreadExit_State, Running_Region1_State, Running_Region1_ThreadExit_State_Code);
oosmos_LeafInit(pThreadTest, Running_Region1_ThreadExitFinally_State, Running_Region1_State, Running_Region1_ThreadExitFinally_State_Code);
oosmos_LeafInit(pThreadTest, Running_Region1_Exiting_State, Running_Region1_State, Running_Region1_Exiting_State_Code);
oosmos_OrthoRegionInit(pThreadTest, Running_Region2_State, Running_State, Running_Region2_Printing_State, NULL);
oosmos_LeafInit(pThreadTest, Running_Region2_Printing_State, Running_Region2_State, Running_Region2_Printing_State_Code);

oosmos_Debug(pThreadTest, OOSMOS_EventNames);
//<<<INIT

return pThreadTest;
}

oosmos/Classes/Tests/threadtest.c

oosmos_ThreadWaitCond_TimeoutMS effectively blocks execution of this object until a condition is met or a timeout expires. See line 141 in the code snippet below for an example.

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void oosmos_ThreadWaitCond_TimeoutMS(bool Condition,
uint32_t TimeoutMS,
bool * pTimeoutStatus);

Prototype

Condition	When this condition is `false`, `OOSMOS` returns from the function to run other objects and then re-enters this statement to check the condition again. It keeps doing this until the condition is `true` and then execution continues to the next statement.
TimeoutMS	The timeout value in milliseconds.
pTimeoutStatus	The address of a `bool` variable that will indicate whether the timeout expired first (`true`) or the condition occurred first (`false`).
See Also	`ThreadBegin`, `ThreadDelayMS`, `ThreadDelaySeconds`, `ThreadDelayUS`, `ThreadEnd`, `ThreadExit`, `ThreadFinally`, `ThreadWaitCond`, `ThreadWaitEvent`, `ThreadWaitEvent_TimeoutMS`, `ThreadYield`

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//	[MIT]
// OOSMOS threadtest Class
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#include "oosmos.h"	[...]
#include "prt.h"
#include "threadtest.h"
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>

//
// Adjust this in order to preallocate all 'threadtest' objects.
// Use 1 for a memory constrained environment.
//
#ifndef MAX_THREADTEST
#define MAX_THREADTEST 10
#endif

//>>>EVENTS
enum {
evDone = 1,
evPrint = 2
};

#ifdef oosmos_DEBUG
static const char * OOSMOS_EventNames(int EventCode)
{
switch (EventCode) {
case evDone: return "evDone";
case evPrint: return "evPrint";
default: return "";
}
}
#endif
//<<<EVENTS

typedef union {
oosmos_sEvent Base;
} uEvents;

struct threadtestTag
{
//>>>DECL
oosmos_sStateMachine(ROOT, uEvents, 3);
oosmos_sOrtho Running_State;
oosmos_sOrthoRegion Running_Region1_State;
oosmos_sLeaf Running_Region1_DelayMS_State;
oosmos_sLeaf Running_Region1_WaitCond_State;
oosmos_sLeaf Running_Region1_WaitCond_TimeoutMS_State;
oosmos_sLeaf Running_Region1_WaitEvent_State;
oosmos_sLeaf Running_Region1_WaitEvent_TimeoutMS_State;
oosmos_sLeaf Running_Region1_ThreadExit_State;
oosmos_sLeaf Running_Region1_ThreadExitFinally_State;
oosmos_sLeaf Running_Region1_Exiting_State;
oosmos_sOrthoRegion Running_Region2_State;
oosmos_sLeaf Running_Region2_Printing_State;
//<<<DECL
unsigned m_WC_Timeout_Successes;
unsigned m_WE_Timeout_Successes;

unsigned m_ThreadExitCount;
};

static bool ConditionRandom(int Range)
{
return rand() % Range == 0;
}

static bool ConditionTrue(void)
{
return true;
}

static bool ConditionFalse(void)
{
return false;
}

static void DelayMS_Thread(threadtest * pThreadTest, oosmos_sState * pState)
{
oosmos_UNUSED(pThreadTest);

oosmos_ThreadBegin();
prtFormatted("ThreadDelayMS...\n");
oosmos_ThreadDelayMS(3000);
prtFormatted("ThreadDelayMS SUCCESS\n\n");
oosmos_ThreadEnd();
}

static void WaitCond_Thread(threadtest * pThreadTest, oosmos_sState * pState)
{
oosmos_ThreadBegin();
prtFormatted("ThreadWaitCond...\n");
oosmos_ThreadWaitCond(ConditionRandom(2));
prtFormatted("ThreadWaitCond SUCCESS\n\n");
oosmos_UNUSED(pThreadTest);
oosmos_ThreadEnd();
}

static void WaitCond_TimeoutMS_Thread(threadtest * pThreadTest, oosmos_sState * pState)
{
oosmos_ThreadBegin();
bool TimedOut = false;
pThreadTest->m_WC_Timeout_Successes = 0;

prtFormatted("ThreadWaitCond_TimeoutMS...\n");

oosmos_ThreadWaitCond_TimeoutMS(ConditionTrue(), 100, &TimedOut);
pThreadTest->m_WC_Timeout_Successes += (TimedOut == false);

oosmos_ThreadWaitCond_TimeoutMS(ConditionFalse(), 100, &TimedOut);
pThreadTest->m_WC_Timeout_Successes += (TimedOut == true);
prtFormatted("ThreadWaitCond_TimeoutMS %s\n\n", pThreadTest->m_WC_Timeout_Successes == 2 ? "SUCCESS" : "FAILURE");
oosmos_ThreadEnd();
}

static void WaitEvent_Thread(threadtest * pThreadTest, oosmos_sState * pState)
{
oosmos_ThreadBegin();
prtFormatted("ThreadWaitEvent...\n");

oosmos_PushEventCode(pThreadTest, evPrint);
oosmos_ThreadWaitEvent(evDone);
prtFormatted("ThreadWaitEvent SUCCESS\n\n");
oosmos_ThreadEnd();
}

static void WaitEvent_TimeoutMS_Thread(threadtest * pThreadTest, oosmos_sState * pState)
{
oosmos_ThreadBegin();
bool TimedOut = false;
pThreadTest->m_WE_Timeout_Successes = 0;

prtFormatted("ThreadWaitEvent_TimeoutMS...\n");

oosmos_PushEventCode(pThreadTest, evPrint);
oosmos_ThreadWaitEvent_TimeoutMS(evPrint, 100, &TimedOut);
pThreadTest->m_WE_Timeout_Successes += (TimedOut == false);

oosmos_ThreadWaitEvent_TimeoutMS(evPrint, 100, &TimedOut);
pThreadTest->m_WE_Timeout_Successes += (TimedOut == true);
prtFormatted("ThreadWaitEvent_TimeoutMS %s\n\n", pThreadTest->m_WE_Timeout_Successes == 2 ? "SUCCESS" : "FAILURE");
oosmos_ThreadEnd();
}

static void ThreadExit_Thread(threadtest * pThreadTest, oosmos_sState * pState)	[...]
{
oosmos_ThreadBegin();
pThreadTest->m_ThreadExitCount = 0;
oosmos_ThreadYield();
pThreadTest->m_ThreadExitCount++;
prtFormatted("ThreadExit SUCCESS\n");
oosmos_ThreadExit();
oosmos_ThreadEnd();
}

static void ThreadExitFinally_Thread(threadtest * pThreadTest, oosmos_sState * pState)
{
oosmos_ThreadBegin();
pThreadTest->m_ThreadExitCount = 0;
oosmos_ThreadYield();
pThreadTest->m_ThreadExitCount++;
oosmos_ThreadExit();
oosmos_ThreadFinally();
pThreadTest->m_ThreadExitCount++;

if (pThreadTest->m_ThreadExitCount == 2) {
prtFormatted("ThreadExitFinally SUCCESS\n");
} else {
prtFormatted("ThreadExitFinally FAILURE\n");
}
oosmos_ThreadEnd();
}

//>>>CODE
static bool Running_Region1_DelayMS_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
threadtest * pThreadTest = (threadtest *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_POLL: {
DelayMS_Thread(pThreadTest, pState);
return true;
}
case oosmos_COMPLETE: {
return oosmos_Transition(pThreadTest, pState, Running_Region1_WaitCond_State);
}
}

return false;
}

static bool Running_Region1_WaitCond_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
threadtest * pThreadTest = (threadtest *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_POLL: {
WaitCond_Thread(pThreadTest, pState);
return true;
}
case oosmos_COMPLETE: {
return oosmos_Transition(pThreadTest, pState, Running_Region1_WaitCond_TimeoutMS_State);
}
}

return false;
}

static bool Running_Region1_WaitCond_TimeoutMS_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
threadtest * pThreadTest = (threadtest *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_POLL: {
WaitCond_TimeoutMS_Thread(pThreadTest, pState);
return true;
}
case oosmos_COMPLETE: {
return oosmos_Transition(pThreadTest, pState, Running_Region1_WaitEvent_State);
}
}

return false;
}

static bool Running_Region1_WaitEvent_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
threadtest * pThreadTest = (threadtest *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_POLL: {
WaitEvent_Thread(pThreadTest, pState);
return true;
}
case oosmos_COMPLETE: {
return oosmos_Transition(pThreadTest, pState, Running_Region1_WaitEvent_TimeoutMS_State);
}
}

return false;
}

static bool Running_Region1_WaitEvent_TimeoutMS_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
threadtest * pThreadTest = (threadtest *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_POLL: {
WaitEvent_TimeoutMS_Thread(pThreadTest, pState);
return true;
}
case oosmos_COMPLETE: {
return oosmos_Transition(pThreadTest, pState, Running_Region1_ThreadExit_State);
}
}

return false;
}

static bool Running_Region1_ThreadExit_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
threadtest * pThreadTest = (threadtest *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_POLL: {
ThreadExit_Thread(pThreadTest, pState);
return true;
}
case oosmos_COMPLETE: {
return oosmos_Transition(pThreadTest, pState, Running_Region1_ThreadExitFinally_State);
}
}

return false;
}

static bool Running_Region1_ThreadExitFinally_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
threadtest * pThreadTest = (threadtest *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_POLL: {
ThreadExitFinally_Thread(pThreadTest, pState);
return true;
}
case oosmos_COMPLETE: {
return oosmos_Transition(pThreadTest, pState, Running_Region1_Exiting_State);
}
}

return false;
}

static bool Running_Region1_Exiting_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
switch (oosmos_EventCode(pEvent)) {
case oosmos_ENTER: {
oosmos_EndProgram(1);
return true;
}
}

oosmos_UNUSED(pObject);
oosmos_UNUSED(pState);
return false;
}

static void OOSMOS_Action_2e6a8ac5(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
threadtest * pThreadTest = (threadtest *) pObject;

printf("Printing...\n");
oosmos_PushEventCode(pThreadTest, evDone);

oosmos_UNUSED(pState);
oosmos_UNUSED(pEvent);
}

static bool Running_Region2_Printing_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
threadtest * pThreadTest = (threadtest *) pObject;

switch (oosmos_EventCode(pEvent)) {
case evPrint: {
return oosmos_TransitionAction(pThreadTest, pState, Running_Region2_Printing_State, pEvent, OOSMOS_Action_2e6a8ac5);
}
}

return false;
}
//<<<CODE

extern threadtest * threadtestNew(void)
{
oosmos_Allocate(pThreadTest, threadtest, MAX_THREADTEST, NULL);

//>>>INIT
oosmos_StateMachineInit(pThreadTest, ROOT, NULL, Running_State);
oosmos_OrthoInit(pThreadTest, Running_State, ROOT, NULL);
oosmos_OrthoRegionInit(pThreadTest, Running_Region1_State, Running_State, Running_Region1_DelayMS_State, NULL);
oosmos_LeafInit(pThreadTest, Running_Region1_DelayMS_State, Running_Region1_State, Running_Region1_DelayMS_State_Code);
oosmos_LeafInit(pThreadTest, Running_Region1_WaitCond_State, Running_Region1_State, Running_Region1_WaitCond_State_Code);
oosmos_LeafInit(pThreadTest, Running_Region1_WaitCond_TimeoutMS_State, Running_Region1_State, Running_Region1_WaitCond_TimeoutMS_State_Code);
oosmos_LeafInit(pThreadTest, Running_Region1_WaitEvent_State, Running_Region1_State, Running_Region1_WaitEvent_State_Code);
oosmos_LeafInit(pThreadTest, Running_Region1_WaitEvent_TimeoutMS_State, Running_Region1_State, Running_Region1_WaitEvent_TimeoutMS_State_Code);
oosmos_LeafInit(pThreadTest, Running_Region1_ThreadExit_State, Running_Region1_State, Running_Region1_ThreadExit_State_Code);
oosmos_LeafInit(pThreadTest, Running_Region1_ThreadExitFinally_State, Running_Region1_State, Running_Region1_ThreadExitFinally_State_Code);
oosmos_LeafInit(pThreadTest, Running_Region1_Exiting_State, Running_Region1_State, Running_Region1_Exiting_State_Code);
oosmos_OrthoRegionInit(pThreadTest, Running_Region2_State, Running_State, Running_Region2_Printing_State, NULL);
oosmos_LeafInit(pThreadTest, Running_Region2_Printing_State, Running_Region2_State, Running_Region2_Printing_State_Code);

oosmos_Debug(pThreadTest, OOSMOS_EventNames);
//<<<INIT

return pThreadTest;
}

oosmos/Classes/Tests/threadtest.c

oosmos_ThreadWaitEvent effectively blocks execution of this object until the specified event is received. See line 127 in the code snippet below for an example.
This form of oosmos_ThreadWaitEvent does not accept a timeout, so you should be certain that the event will be received eventually. There are other forms of oosmos_ThreadWaitEvent that do accept a timeout value.

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void oosmos_ThreadWaitEvent(int WaitEventCode);

Prototype

WaitEventCode	The event code that must be received before execution can continue.
See Also	`ThreadBegin`, `ThreadDelayMS`, `ThreadDelaySeconds`, `ThreadDelayUS`, `ThreadEnd`, `ThreadExit`, `ThreadFinally`, `ThreadWaitCond`, `ThreadWaitCond_TimeoutMS`, `ThreadWaitEvent_TimeoutMS`, `ThreadYield`

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//	[MIT]
// OOSMOS threadtest Class
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#include "oosmos.h"	[...]
#include "prt.h"
#include "threadtest.h"
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>

//
// Adjust this in order to preallocate all 'threadtest' objects.
// Use 1 for a memory constrained environment.
//
#ifndef MAX_THREADTEST
#define MAX_THREADTEST 10
#endif

//>>>EVENTS
enum {
evDone = 1,
evPrint = 2
};

#ifdef oosmos_DEBUG
static const char * OOSMOS_EventNames(int EventCode)
{
switch (EventCode) {
case evDone: return "evDone";
case evPrint: return "evPrint";
default: return "";
}
}
#endif
//<<<EVENTS

typedef union {
oosmos_sEvent Base;
} uEvents;

struct threadtestTag
{
//>>>DECL
oosmos_sStateMachine(ROOT, uEvents, 3);
oosmos_sOrtho Running_State;
oosmos_sOrthoRegion Running_Region1_State;
oosmos_sLeaf Running_Region1_DelayMS_State;
oosmos_sLeaf Running_Region1_WaitCond_State;
oosmos_sLeaf Running_Region1_WaitCond_TimeoutMS_State;
oosmos_sLeaf Running_Region1_WaitEvent_State;
oosmos_sLeaf Running_Region1_WaitEvent_TimeoutMS_State;
oosmos_sLeaf Running_Region1_ThreadExit_State;
oosmos_sLeaf Running_Region1_ThreadExitFinally_State;
oosmos_sLeaf Running_Region1_Exiting_State;
oosmos_sOrthoRegion Running_Region2_State;
oosmos_sLeaf Running_Region2_Printing_State;
//<<<DECL
unsigned m_WC_Timeout_Successes;
unsigned m_WE_Timeout_Successes;

unsigned m_ThreadExitCount;
};

static bool ConditionRandom(int Range)
{
return rand() % Range == 0;
}

static bool ConditionTrue(void)
{
return true;
}

static bool ConditionFalse(void)
{
return false;
}

static void DelayMS_Thread(threadtest * pThreadTest, oosmos_sState * pState)
{
oosmos_UNUSED(pThreadTest);

oosmos_ThreadBegin();
prtFormatted("ThreadDelayMS...\n");
oosmos_ThreadDelayMS(3000);
prtFormatted("ThreadDelayMS SUCCESS\n\n");
oosmos_ThreadEnd();
}

static void WaitCond_Thread(threadtest * pThreadTest, oosmos_sState * pState)
{
oosmos_ThreadBegin();
prtFormatted("ThreadWaitCond...\n");
oosmos_ThreadWaitCond(ConditionRandom(2));
prtFormatted("ThreadWaitCond SUCCESS\n\n");
oosmos_UNUSED(pThreadTest);
oosmos_ThreadEnd();
}

static void WaitCond_TimeoutMS_Thread(threadtest * pThreadTest, oosmos_sState * pState)
{
oosmos_ThreadBegin();
bool TimedOut = false;
pThreadTest->m_WC_Timeout_Successes = 0;

prtFormatted("ThreadWaitCond_TimeoutMS...\n");

oosmos_ThreadWaitCond_TimeoutMS(ConditionTrue(), 100, &TimedOut);
pThreadTest->m_WC_Timeout_Successes += (TimedOut == false);

oosmos_ThreadWaitCond_TimeoutMS(ConditionFalse(), 100, &TimedOut);
pThreadTest->m_WC_Timeout_Successes += (TimedOut == true);
prtFormatted("ThreadWaitCond_TimeoutMS %s\n\n", pThreadTest->m_WC_Timeout_Successes == 2 ? "SUCCESS" : "FAILURE");
oosmos_ThreadEnd();
}

static void WaitEvent_Thread(threadtest * pThreadTest, oosmos_sState * pState)
{
oosmos_ThreadBegin();
prtFormatted("ThreadWaitEvent...\n");

oosmos_PushEventCode(pThreadTest, evPrint);
oosmos_ThreadWaitEvent(evDone);
prtFormatted("ThreadWaitEvent SUCCESS\n\n");
oosmos_ThreadEnd();
}

static void WaitEvent_TimeoutMS_Thread(threadtest * pThreadTest, oosmos_sState * pState)	[...]
{
oosmos_ThreadBegin();
bool TimedOut = false;
pThreadTest->m_WE_Timeout_Successes = 0;

prtFormatted("ThreadWaitEvent_TimeoutMS...\n");

oosmos_PushEventCode(pThreadTest, evPrint);
oosmos_ThreadWaitEvent_TimeoutMS(evPrint, 100, &TimedOut);
pThreadTest->m_WE_Timeout_Successes += (TimedOut == false);

oosmos_ThreadWaitEvent_TimeoutMS(evPrint, 100, &TimedOut);
pThreadTest->m_WE_Timeout_Successes += (TimedOut == true);
prtFormatted("ThreadWaitEvent_TimeoutMS %s\n\n", pThreadTest->m_WE_Timeout_Successes == 2 ? "SUCCESS" : "FAILURE");
oosmos_ThreadEnd();
}

static void ThreadExit_Thread(threadtest * pThreadTest, oosmos_sState * pState)
{
oosmos_ThreadBegin();
pThreadTest->m_ThreadExitCount = 0;
oosmos_ThreadYield();
pThreadTest->m_ThreadExitCount++;
prtFormatted("ThreadExit SUCCESS\n");
oosmos_ThreadExit();
oosmos_ThreadEnd();
}

static void ThreadExitFinally_Thread(threadtest * pThreadTest, oosmos_sState * pState)
{
oosmos_ThreadBegin();
pThreadTest->m_ThreadExitCount = 0;
oosmos_ThreadYield();
pThreadTest->m_ThreadExitCount++;
oosmos_ThreadExit();
oosmos_ThreadFinally();
pThreadTest->m_ThreadExitCount++;

if (pThreadTest->m_ThreadExitCount == 2) {
prtFormatted("ThreadExitFinally SUCCESS\n");
} else {
prtFormatted("ThreadExitFinally FAILURE\n");
}
oosmos_ThreadEnd();
}

//>>>CODE
static bool Running_Region1_DelayMS_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
threadtest * pThreadTest = (threadtest *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_POLL: {
DelayMS_Thread(pThreadTest, pState);
return true;
}
case oosmos_COMPLETE: {
return oosmos_Transition(pThreadTest, pState, Running_Region1_WaitCond_State);
}
}

return false;
}

static bool Running_Region1_WaitCond_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
threadtest * pThreadTest = (threadtest *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_POLL: {
WaitCond_Thread(pThreadTest, pState);
return true;
}
case oosmos_COMPLETE: {
return oosmos_Transition(pThreadTest, pState, Running_Region1_WaitCond_TimeoutMS_State);
}
}

return false;
}

static bool Running_Region1_WaitCond_TimeoutMS_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
threadtest * pThreadTest = (threadtest *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_POLL: {
WaitCond_TimeoutMS_Thread(pThreadTest, pState);
return true;
}
case oosmos_COMPLETE: {
return oosmos_Transition(pThreadTest, pState, Running_Region1_WaitEvent_State);
}
}

return false;
}

static bool Running_Region1_WaitEvent_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
threadtest * pThreadTest = (threadtest *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_POLL: {
WaitEvent_Thread(pThreadTest, pState);
return true;
}
case oosmos_COMPLETE: {
return oosmos_Transition(pThreadTest, pState, Running_Region1_WaitEvent_TimeoutMS_State);
}
}

return false;
}

static bool Running_Region1_WaitEvent_TimeoutMS_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
threadtest * pThreadTest = (threadtest *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_POLL: {
WaitEvent_TimeoutMS_Thread(pThreadTest, pState);
return true;
}
case oosmos_COMPLETE: {
return oosmos_Transition(pThreadTest, pState, Running_Region1_ThreadExit_State);
}
}

return false;
}

static bool Running_Region1_ThreadExit_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
threadtest * pThreadTest = (threadtest *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_POLL: {
ThreadExit_Thread(pThreadTest, pState);
return true;
}
case oosmos_COMPLETE: {
return oosmos_Transition(pThreadTest, pState, Running_Region1_ThreadExitFinally_State);
}
}

return false;
}

static bool Running_Region1_ThreadExitFinally_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
threadtest * pThreadTest = (threadtest *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_POLL: {
ThreadExitFinally_Thread(pThreadTest, pState);
return true;
}
case oosmos_COMPLETE: {
return oosmos_Transition(pThreadTest, pState, Running_Region1_Exiting_State);
}
}

return false;
}

static bool Running_Region1_Exiting_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
switch (oosmos_EventCode(pEvent)) {
case oosmos_ENTER: {
oosmos_EndProgram(1);
return true;
}
}

oosmos_UNUSED(pObject);
oosmos_UNUSED(pState);
return false;
}

static void OOSMOS_Action_2e6a8ac5(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
threadtest * pThreadTest = (threadtest *) pObject;

printf("Printing...\n");
oosmos_PushEventCode(pThreadTest, evDone);

oosmos_UNUSED(pState);
oosmos_UNUSED(pEvent);
}

static bool Running_Region2_Printing_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
threadtest * pThreadTest = (threadtest *) pObject;

switch (oosmos_EventCode(pEvent)) {
case evPrint: {
return oosmos_TransitionAction(pThreadTest, pState, Running_Region2_Printing_State, pEvent, OOSMOS_Action_2e6a8ac5);
}
}

return false;
}
//<<<CODE

extern threadtest * threadtestNew(void)
{
oosmos_Allocate(pThreadTest, threadtest, MAX_THREADTEST, NULL);

//>>>INIT
oosmos_StateMachineInit(pThreadTest, ROOT, NULL, Running_State);
oosmos_OrthoInit(pThreadTest, Running_State, ROOT, NULL);
oosmos_OrthoRegionInit(pThreadTest, Running_Region1_State, Running_State, Running_Region1_DelayMS_State, NULL);
oosmos_LeafInit(pThreadTest, Running_Region1_DelayMS_State, Running_Region1_State, Running_Region1_DelayMS_State_Code);
oosmos_LeafInit(pThreadTest, Running_Region1_WaitCond_State, Running_Region1_State, Running_Region1_WaitCond_State_Code);
oosmos_LeafInit(pThreadTest, Running_Region1_WaitCond_TimeoutMS_State, Running_Region1_State, Running_Region1_WaitCond_TimeoutMS_State_Code);
oosmos_LeafInit(pThreadTest, Running_Region1_WaitEvent_State, Running_Region1_State, Running_Region1_WaitEvent_State_Code);
oosmos_LeafInit(pThreadTest, Running_Region1_WaitEvent_TimeoutMS_State, Running_Region1_State, Running_Region1_WaitEvent_TimeoutMS_State_Code);
oosmos_LeafInit(pThreadTest, Running_Region1_ThreadExit_State, Running_Region1_State, Running_Region1_ThreadExit_State_Code);
oosmos_LeafInit(pThreadTest, Running_Region1_ThreadExitFinally_State, Running_Region1_State, Running_Region1_ThreadExitFinally_State_Code);
oosmos_LeafInit(pThreadTest, Running_Region1_Exiting_State, Running_Region1_State, Running_Region1_Exiting_State_Code);
oosmos_OrthoRegionInit(pThreadTest, Running_Region2_State, Running_State, Running_Region2_Printing_State, NULL);
oosmos_LeafInit(pThreadTest, Running_Region2_Printing_State, Running_Region2_State, Running_Region2_Printing_State_Code);

oosmos_Debug(pThreadTest, OOSMOS_EventNames);
//<<<INIT

return pThreadTest;
}

oosmos/Classes/Tests/threadtest.c

oosmos_ThreadWaitEvent_TimeoutMS effectively blocks execution of this object until a condition is met or a timeout expires. See line 141 in the code snippet below for an example.

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void oosmos_ThreadWaitEvent_TimeoutMS(int WaitEventCode,
uint32_t TimeoutMS,
bool * pTimeoutStatus);

Prototype

WaitEventCode	The event code that must be received before execution can continue.
TimeoutMS	The timeout value in milliseconds.
pTimeoutStatus	The address of a `bool` variable that will indicate whether the timeout expired first (`true`) or the event occurred first (`false`).
See Also	`ThreadBegin`, `ThreadDelayMS`, `ThreadDelaySeconds`, `ThreadDelayUS`, `ThreadEnd`, `ThreadExit`, `ThreadFinally`, `ThreadWaitCond`, `ThreadWaitCond_TimeoutMS`, `ThreadWaitEvent`, `ThreadYield`

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//	[MIT]
// OOSMOS threadtest Class
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#include "oosmos.h"	[...]
#include "prt.h"
#include "threadtest.h"
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>

//
// Adjust this in order to preallocate all 'threadtest' objects.
// Use 1 for a memory constrained environment.
//
#ifndef MAX_THREADTEST
#define MAX_THREADTEST 10
#endif

//>>>EVENTS
enum {
evDone = 1,
evPrint = 2
};

#ifdef oosmos_DEBUG
static const char * OOSMOS_EventNames(int EventCode)
{
switch (EventCode) {
case evDone: return "evDone";
case evPrint: return "evPrint";
default: return "";
}
}
#endif
//<<<EVENTS

typedef union {
oosmos_sEvent Base;
} uEvents;

struct threadtestTag
{
//>>>DECL
oosmos_sStateMachine(ROOT, uEvents, 3);
oosmos_sOrtho Running_State;
oosmos_sOrthoRegion Running_Region1_State;
oosmos_sLeaf Running_Region1_DelayMS_State;
oosmos_sLeaf Running_Region1_WaitCond_State;
oosmos_sLeaf Running_Region1_WaitCond_TimeoutMS_State;
oosmos_sLeaf Running_Region1_WaitEvent_State;
oosmos_sLeaf Running_Region1_WaitEvent_TimeoutMS_State;
oosmos_sLeaf Running_Region1_ThreadExit_State;
oosmos_sLeaf Running_Region1_ThreadExitFinally_State;
oosmos_sLeaf Running_Region1_Exiting_State;
oosmos_sOrthoRegion Running_Region2_State;
oosmos_sLeaf Running_Region2_Printing_State;
//<<<DECL
unsigned m_WC_Timeout_Successes;
unsigned m_WE_Timeout_Successes;

unsigned m_ThreadExitCount;
};

static bool ConditionRandom(int Range)
{
return rand() % Range == 0;
}

static bool ConditionTrue(void)
{
return true;
}

static bool ConditionFalse(void)
{
return false;
}

static void DelayMS_Thread(threadtest * pThreadTest, oosmos_sState * pState)
{
oosmos_UNUSED(pThreadTest);

oosmos_ThreadBegin();
prtFormatted("ThreadDelayMS...\n");
oosmos_ThreadDelayMS(3000);
prtFormatted("ThreadDelayMS SUCCESS\n\n");
oosmos_ThreadEnd();
}

static void WaitCond_Thread(threadtest * pThreadTest, oosmos_sState * pState)
{
oosmos_ThreadBegin();
prtFormatted("ThreadWaitCond...\n");
oosmos_ThreadWaitCond(ConditionRandom(2));
prtFormatted("ThreadWaitCond SUCCESS\n\n");
oosmos_UNUSED(pThreadTest);
oosmos_ThreadEnd();
}

static void WaitCond_TimeoutMS_Thread(threadtest * pThreadTest, oosmos_sState * pState)
{
oosmos_ThreadBegin();
bool TimedOut = false;
pThreadTest->m_WC_Timeout_Successes = 0;

prtFormatted("ThreadWaitCond_TimeoutMS...\n");

oosmos_ThreadWaitCond_TimeoutMS(ConditionTrue(), 100, &TimedOut);
pThreadTest->m_WC_Timeout_Successes += (TimedOut == false);

oosmos_ThreadWaitCond_TimeoutMS(ConditionFalse(), 100, &TimedOut);
pThreadTest->m_WC_Timeout_Successes += (TimedOut == true);
prtFormatted("ThreadWaitCond_TimeoutMS %s\n\n", pThreadTest->m_WC_Timeout_Successes == 2 ? "SUCCESS" : "FAILURE");
oosmos_ThreadEnd();
}

static void WaitEvent_Thread(threadtest * pThreadTest, oosmos_sState * pState)
{
oosmos_ThreadBegin();
prtFormatted("ThreadWaitEvent...\n");

oosmos_PushEventCode(pThreadTest, evPrint);
oosmos_ThreadWaitEvent(evDone);
prtFormatted("ThreadWaitEvent SUCCESS\n\n");
oosmos_ThreadEnd();
}

static void WaitEvent_TimeoutMS_Thread(threadtest * pThreadTest, oosmos_sState * pState)
{
oosmos_ThreadBegin();
bool TimedOut = false;
pThreadTest->m_WE_Timeout_Successes = 0;

prtFormatted("ThreadWaitEvent_TimeoutMS...\n");

oosmos_PushEventCode(pThreadTest, evPrint);
oosmos_ThreadWaitEvent_TimeoutMS(evPrint, 100, &TimedOut);
pThreadTest->m_WE_Timeout_Successes += (TimedOut == false);

oosmos_ThreadWaitEvent_TimeoutMS(evPrint, 100, &TimedOut);
pThreadTest->m_WE_Timeout_Successes += (TimedOut == true);
prtFormatted("ThreadWaitEvent_TimeoutMS %s\n\n", pThreadTest->m_WE_Timeout_Successes == 2 ? "SUCCESS" : "FAILURE");
oosmos_ThreadEnd();
}

static void ThreadExit_Thread(threadtest * pThreadTest, oosmos_sState * pState)	[...]
{
oosmos_ThreadBegin();
pThreadTest->m_ThreadExitCount = 0;
oosmos_ThreadYield();
pThreadTest->m_ThreadExitCount++;
prtFormatted("ThreadExit SUCCESS\n");
oosmos_ThreadExit();
oosmos_ThreadEnd();
}

static void ThreadExitFinally_Thread(threadtest * pThreadTest, oosmos_sState * pState)
{
oosmos_ThreadBegin();
pThreadTest->m_ThreadExitCount = 0;
oosmos_ThreadYield();
pThreadTest->m_ThreadExitCount++;
oosmos_ThreadExit();
oosmos_ThreadFinally();
pThreadTest->m_ThreadExitCount++;

if (pThreadTest->m_ThreadExitCount == 2) {
prtFormatted("ThreadExitFinally SUCCESS\n");
} else {
prtFormatted("ThreadExitFinally FAILURE\n");
}
oosmos_ThreadEnd();
}

//>>>CODE
static bool Running_Region1_DelayMS_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
threadtest * pThreadTest = (threadtest *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_POLL: {
DelayMS_Thread(pThreadTest, pState);
return true;
}
case oosmos_COMPLETE: {
return oosmos_Transition(pThreadTest, pState, Running_Region1_WaitCond_State);
}
}

return false;
}

static bool Running_Region1_WaitCond_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
threadtest * pThreadTest = (threadtest *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_POLL: {
WaitCond_Thread(pThreadTest, pState);
return true;
}
case oosmos_COMPLETE: {
return oosmos_Transition(pThreadTest, pState, Running_Region1_WaitCond_TimeoutMS_State);
}
}

return false;
}

static bool Running_Region1_WaitCond_TimeoutMS_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
threadtest * pThreadTest = (threadtest *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_POLL: {
WaitCond_TimeoutMS_Thread(pThreadTest, pState);
return true;
}
case oosmos_COMPLETE: {
return oosmos_Transition(pThreadTest, pState, Running_Region1_WaitEvent_State);
}
}

return false;
}

static bool Running_Region1_WaitEvent_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
threadtest * pThreadTest = (threadtest *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_POLL: {
WaitEvent_Thread(pThreadTest, pState);
return true;
}
case oosmos_COMPLETE: {
return oosmos_Transition(pThreadTest, pState, Running_Region1_WaitEvent_TimeoutMS_State);
}
}

return false;
}

static bool Running_Region1_WaitEvent_TimeoutMS_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
threadtest * pThreadTest = (threadtest *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_POLL: {
WaitEvent_TimeoutMS_Thread(pThreadTest, pState);
return true;
}
case oosmos_COMPLETE: {
return oosmos_Transition(pThreadTest, pState, Running_Region1_ThreadExit_State);
}
}

return false;
}

static bool Running_Region1_ThreadExit_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
threadtest * pThreadTest = (threadtest *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_POLL: {
ThreadExit_Thread(pThreadTest, pState);
return true;
}
case oosmos_COMPLETE: {
return oosmos_Transition(pThreadTest, pState, Running_Region1_ThreadExitFinally_State);
}
}

return false;
}

static bool Running_Region1_ThreadExitFinally_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
threadtest * pThreadTest = (threadtest *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_POLL: {
ThreadExitFinally_Thread(pThreadTest, pState);
return true;
}
case oosmos_COMPLETE: {
return oosmos_Transition(pThreadTest, pState, Running_Region1_Exiting_State);
}
}

return false;
}

static bool Running_Region1_Exiting_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
switch (oosmos_EventCode(pEvent)) {
case oosmos_ENTER: {
oosmos_EndProgram(1);
return true;
}
}

oosmos_UNUSED(pObject);
oosmos_UNUSED(pState);
return false;
}

static void OOSMOS_Action_2e6a8ac5(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
threadtest * pThreadTest = (threadtest *) pObject;

printf("Printing...\n");
oosmos_PushEventCode(pThreadTest, evDone);

oosmos_UNUSED(pState);
oosmos_UNUSED(pEvent);
}

static bool Running_Region2_Printing_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
threadtest * pThreadTest = (threadtest *) pObject;

switch (oosmos_EventCode(pEvent)) {
case evPrint: {
return oosmos_TransitionAction(pThreadTest, pState, Running_Region2_Printing_State, pEvent, OOSMOS_Action_2e6a8ac5);
}
}

return false;
}
//<<<CODE

extern threadtest * threadtestNew(void)
{
oosmos_Allocate(pThreadTest, threadtest, MAX_THREADTEST, NULL);

//>>>INIT
oosmos_StateMachineInit(pThreadTest, ROOT, NULL, Running_State);
oosmos_OrthoInit(pThreadTest, Running_State, ROOT, NULL);
oosmos_OrthoRegionInit(pThreadTest, Running_Region1_State, Running_State, Running_Region1_DelayMS_State, NULL);
oosmos_LeafInit(pThreadTest, Running_Region1_DelayMS_State, Running_Region1_State, Running_Region1_DelayMS_State_Code);
oosmos_LeafInit(pThreadTest, Running_Region1_WaitCond_State, Running_Region1_State, Running_Region1_WaitCond_State_Code);
oosmos_LeafInit(pThreadTest, Running_Region1_WaitCond_TimeoutMS_State, Running_Region1_State, Running_Region1_WaitCond_TimeoutMS_State_Code);
oosmos_LeafInit(pThreadTest, Running_Region1_WaitEvent_State, Running_Region1_State, Running_Region1_WaitEvent_State_Code);
oosmos_LeafInit(pThreadTest, Running_Region1_WaitEvent_TimeoutMS_State, Running_Region1_State, Running_Region1_WaitEvent_TimeoutMS_State_Code);
oosmos_LeafInit(pThreadTest, Running_Region1_ThreadExit_State, Running_Region1_State, Running_Region1_ThreadExit_State_Code);
oosmos_LeafInit(pThreadTest, Running_Region1_ThreadExitFinally_State, Running_Region1_State, Running_Region1_ThreadExitFinally_State_Code);
oosmos_LeafInit(pThreadTest, Running_Region1_Exiting_State, Running_Region1_State, Running_Region1_Exiting_State_Code);
oosmos_OrthoRegionInit(pThreadTest, Running_Region2_State, Running_State, Running_Region2_Printing_State, NULL);
oosmos_LeafInit(pThreadTest, Running_Region2_Printing_State, Running_Region2_State, Running_Region2_Printing_State_Code);

oosmos_Debug(pThreadTest, OOSMOS_EventNames);
//<<<INIT

return pThreadTest;
}

oosmos/Classes/Tests/threadtest.c

If you have a loop that will use a lot of CPU time, it could hold up execution of other OOSMOS objects in the system, you can use the oosmos_ThreadYield call to relinquish control occasionally in your loop.
See line 36 in the code snippet below for an example. In this example, we relinquish control every time through the loop, but you could use the C modulo operator (%) to relinquish every N iterations through the loop.

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void oosmos_ThreadYield();

Prototype

See Also

ThreadBegin, ThreadDelayMS, ThreadDelaySeconds, ThreadDelayUS, ThreadEnd, ThreadExit, ThreadFinally, ThreadWaitCond, ThreadWaitCond_TimeoutMS, ThreadWaitEvent, ThreadWaitEvent_TimeoutMS

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//	[MIT]
// OOSMOS threadyieldtest class implementation
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#include "oosmos.h"	[...]
#include "prt.h"
#include "threadyieldtest.h"
#include <stdbool.h>
#include <stdlib.h>

#ifndef MAX_THREAD
#define MAX_THREAD 2
#endif

struct threadyieldtestTag
{
//>>>DECL
oosmos_sStateMachineNoQueue(ROOT);
oosmos_sLeaf Running_State;
oosmos_sLeaf Done_State;
//<<<DECL

const char * m_pID;
unsigned m_Count;
unsigned m_Iterations;
};

static void Thread(threadyieldtest * pThreadYieldTest, oosmos_sState * pState)
{
oosmos_ThreadBegin();
for (pThreadYieldTest->m_Count = 1; pThreadYieldTest->m_Count <= pThreadYieldTest->m_Iterations; pThreadYieldTest->m_Count++) {
prtFormatted("Test threadyieldtest, '%s'...\n", pThreadYieldTest->m_pID);
oosmos_ThreadYield();
}
oosmos_ThreadEnd();
}

//>>>CODE	[...]
static bool Running_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
threadyieldtest * pThreadYieldTest = (threadyieldtest *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_POLL: {
Thread(pThreadYieldTest, pState);
return true;
}
case oosmos_COMPLETE: {
return oosmos_Transition(pThreadYieldTest, pState, Done_State);
}
}

return false;
}

static bool Done_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
threadyieldtest * pThreadYieldTest = (threadyieldtest *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_ENTER: {
prtFormatted("Test threadyieldtest, '%s' DONE.\n", pThreadYieldTest->m_pID);
return true;
}
}

oosmos_UNUSED(pState);
return false;
}
//<<<CODE

extern threadyieldtest * threadyieldtestNew(const char * pID, unsigned Iterations)
{
oosmos_Allocate(pThreadYieldTest, threadyieldtest, MAX_THREAD, NULL);

//>>>INIT
oosmos_StateMachineInitNoQueue(pThreadYieldTest, ROOT, NULL, Running_State);
oosmos_LeafInit(pThreadYieldTest, Running_State, ROOT, Running_State_Code);
oosmos_LeafInit(pThreadYieldTest, Done_State, ROOT, Done_State_Code);

oosmos_Debug(pThreadYieldTest, NULL);
//<<<INIT

pThreadYieldTest->m_pID = pID;
pThreadYieldTest->m_Iterations = Iterations;

return pThreadYieldTest;
}

oosmos/Classes/Tests/threadyieldtest.c

oosmos_TIMEOUT is one of the six predefined event macros. This event is generated if a timeout for this state has been previously established and that timeout has expired.
To establish a timeout, use one of oosmos_StateTimeoutMS, oosmos_StateTimeoutSeconds or oosmos_StateTimeoutUS.
See line 39 in the code snippet below for an example.

See Also

COMPLETE, DEFAULT, ENTER, EXIT, POLL, StateTimeoutMS, StateTimeoutSeconds, StateTimeoutUS

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//	[MIT]
// OOSMOS StateTimeout Example
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#include "oosmos.h"	[...]
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>

typedef struct testTag test;

//<<<EVENTS
//>>>EVENTS

struct testTag
{
//>>>DECL
oosmos_sStateMachineNoQueue(ROOT);
oosmos_sLeaf MS_State;
oosmos_sLeaf Seconds_State;
oosmos_sLeaf US_State;
oosmos_sLeaf Done_State;
//<<<DECL
unsigned m_TimeMS;
};

//>>>CODE
static bool MS_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_ENTER: {
return oosmos_StateTimeoutMS(pState, (uint32_t) pTest->m_TimeMS);
}
case oosmos_TIMEOUT: {
return oosmos_Transition(pTest, pState, Seconds_State);
}
}

return false;
}

static bool Seconds_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)	[...]
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_ENTER: {
return oosmos_StateTimeoutSeconds(pState, (uint32_t) 1);
}
case oosmos_TIMEOUT: {
return oosmos_Transition(pTest, pState, US_State);
}
}

return false;
}

static bool US_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_ENTER: {
return oosmos_StateTimeoutUS(pState, (uint32_t) 100000);
}
case oosmos_TIMEOUT: {
return oosmos_Transition(pTest, pState, Done_State);
}
}

return false;
}
//<<<CODE

static test * testNew(void)
{
oosmos_Allocate(pTest, test, 1, NULL);

//>>>INIT
oosmos_StateMachineInitNoQueue(pTest, ROOT, NULL, MS_State);
oosmos_LeafInit(pTest, MS_State, ROOT, MS_State_Code);
oosmos_LeafInit(pTest, Seconds_State, ROOT, Seconds_State_Code);
oosmos_LeafInit(pTest, US_State, ROOT, US_State_Code);
oosmos_LeafInit(pTest, Done_State, ROOT, NULL);

oosmos_Debug(pTest, NULL);
//<<<INIT

pTest->m_TimeMS = 1000;

return pTest;
}

extern int main(void)
{
test * pTest = testNew();

for (;;) {
oosmos_RunStateMachines();

if (oosmos_IsInState(pTest, &pTest->Done_State)) {
break;
}

oosmos_DelayMS(1);
}

printf("SUCCESS\n");

return 0;
}

oosmos/Examples/Basic/Windows/StateTimeout.c

oosmos_TimeoutHasExpired checks to see if a previously established timeout has expired.
See line 32 in the code snippet below for an example.

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bool oosmos_TimeoutHasExpired(oosmos_sTimeout * pTimeout);

Prototype

pTimeout	Address of the `oosmos_sTimeout` metadata item.
See Also	`TimeoutInMS`, `TimeoutInSeconds`, `TimeoutInUS`, `sTimeout`

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//	[MIT]
// OOSMOS TimeoutInMS Example
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#include "oosmos.h"	[...]
#include <stdint.h>
#include <stdio.h>

static const uint32_t WaitTimeMS = 1000;

extern int main(void)
{
//
// Allocate a Timeout object.
//
oosmos_sTimeout Timeout;

//
// Set timeout.
//
oosmos_TimeoutInMS(&Timeout, WaitTimeMS);

printf("Waiting for %lu milliseconds...\n", (unsigned long) WaitTimeMS);

for (;;) {
//
// Check if the time has expired.
//
if (oosmos_TimeoutHasExpired(&Timeout)) {
break;
}

//
// Be polite. Prevent 100% CPU usage on multi-tasked
// machines (e.g. Windows or Linux).
//
oosmos_DelayMS(1);
}

printf("SUCCESS\n");

return 0;
}

oosmos/Examples/Basic/Windows/TimeoutInMS.c

oosmos_TimeoutInMS is the low-level timeout mechanism used by the state machine engine. It is provided to give your program the flexibility to have timeout capability without having to add a state machine to your object.
To use it, first execute the oosmos_TimeoutInMS call (line 24) providing the address of a oosmos_sTimeout object (line 19), then periodically check if the timeout has expired using the oosmos_TimeoutHasExpired call (line 32).

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void oosmos_TimeoutInMS(oosmos_sTimeout * pTimeout, uint32_t Milliseconds);

Prototype

pTimeout	Address of the `oosmos_sTimeout` item.
Milliseconds	Number of milliseconds before timeout.
See Also	`TimeoutHasExpired`, `TimeoutInSeconds`, `TimeoutInUS`, `sTimeout`

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//	[MIT]
// OOSMOS TimeoutInMS Example
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#include "oosmos.h"	[...]
#include <stdint.h>
#include <stdio.h>

static const uint32_t WaitTimeMS = 1000;

extern int main(void)
{
//
// Allocate a Timeout object.
//
oosmos_sTimeout Timeout;

//
// Set timeout.
//
oosmos_TimeoutInMS(&Timeout, WaitTimeMS);

printf("Waiting for %lu milliseconds...\n", (unsigned long) WaitTimeMS);

for (;;) {
//
// Check if the time has expired.
//
if (oosmos_TimeoutHasExpired(&Timeout)) {
break;
}

//
// Be polite. Prevent 100% CPU usage on multi-tasked
// machines (e.g. Windows or Linux).
//
oosmos_DelayMS(1);
}

printf("SUCCESS\n");

return 0;
}

oosmos/Examples/Basic/Windows/TimeoutInMS.c

oosmos_TimeoutInSeconds is the low-level timeout mechanism used by the state machine engine. It is provided to give your program the flexibility to have timeout capability without having to add a state machine to your object.
To use it, first execute the oosmos_TimeoutInSeconds call (line 24) providing the address of a oosmos_sTimeout object (line 19), then periodically check if the timeout has expired using the oosmos_TimeoutHasExpired call (line 32).

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void oosmos_TimeoutInSeconds(oosmos_sTimeout * pTimeout, uint32_t Seconds);

Prototype

pTimeout	Address of the `oosmos_sTimeout` item.
Seconds	Number of seconds before timeout.
See Also	`TimeoutHasExpired`, `TimeoutInMS`, `TimeoutInUS`, `sTimeout`

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//	[MIT]
// OOSMOS TimeoutInSeconds Example
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#include "oosmos.h"	[...]
#include <stdint.h>
#include <stdio.h>

static const uint32_t WaitTimeSeconds = 2;

extern int main(void)
{
//
// Allocate a Timeout object.
//
oosmos_sTimeout Timeout;

//
// Set timeout.
//
oosmos_TimeoutInSeconds(&Timeout, WaitTimeSeconds);

printf("Waiting for %lu seconds...\n", (unsigned long) WaitTimeSeconds);

for (;;) {
//
// Check if the time has expired.
//
if (oosmos_TimeoutHasExpired(&Timeout)) {
break;
}

//
// Be polite. Prevent 100% CPU usage on multi-tasked
// machines (e.g. Windows or Linux).
//
oosmos_DelayMS(1);
}

printf("SUCCESS\n");

return 0;
}

oosmos/Examples/Basic/Windows/TimeoutInSeconds.c

oosmos_TimeoutInUS is the low-level timeout mechanism used by the state machine engine. It is provided to give your program the flexibility to have timeout capability without having to add a state machine to your object.
To use it, first execute the oosmos_TimeoutInUS call (line 24) providing the address of a oosmos_sTimeout object (line 19), then periodically check if the timeout has expired using the oosmos_TimeoutHasExpired call (line 32).

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void oosmos_TimeoutInUS(oosmos_sTimeout * pTimeout, uint32_t Microseconds);

Prototype

pTimeout	Address of the `oosmos_sTimeout` item.
Microseconds	Number of microseconds before timeout.
See Also	`TimeoutHasExpired`, `TimeoutInMS`, `TimeoutInSeconds`, `sTimeout`

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//	[MIT]
// OOSMOS TimeoutInUS Example
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#include "oosmos.h"	[...]
#include <stdint.h>
#include <stdio.h>

static const uint32_t WaitTimeUS = oosmos_Seconds2US(2);

extern int main(void)
{
//
// Allocate a Timeout object.
//
oosmos_sTimeout Timeout;

//
// Set timeout.
//
oosmos_TimeoutInUS(&Timeout, WaitTimeUS);

printf("Waiting for %lu microseconds...\n", (unsigned long) WaitTimeUS);

for (;;) {
//
// Check if the time has expired.
//
if (oosmos_TimeoutHasExpired(&Timeout)) {
break;
}

//
// Be polite. Prevent 100% CPU usage on multi-tasked
// machines (e.g. Windows or Linux).
//
oosmos_DelayMS(75);
}

printf("SUCCESS\n");

return 0;
}

oosmos/Examples/Basic/Windows/TimeoutInUS.c

oosmos_TimestampMS returns the number of milliseconds since program start. OOSMOS uses it to timestamp debug output.

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uint32_t oosmos_TimestampMS(void);

Prototype

See Also

GetFreeRunningUS

oosmos_Transition causes a transition from the current state to the specified target state. During this transition process, we execute all the nested oosmos_EXIT event handlers as we exit the from states and then execute all the oosmos_ENTER event handlers as we enter into all the (possibly nested) states to the target state. (See line 42.)
Note: In the example, we use the state version of the toggle object in the oosmos/Classes directory instead of the Thread version.

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bool oosmos_Transition(pObject, pFromState, ToState);

Prototype

pObject	The address of the object that contains the state machine.
pFromState	The same `pState` argument that was passed into the containing state handler.
ToState	The name of the state we are transitioning to.
RETURN	Always returns `true`.

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//	[MIT]
// OOSMOS toggle Class
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#include "oosmos.h"	[...]
#include "toggle.h"
#include "pin.h"
#include <stdbool.h>
#include <stdint.h>
#include <stddef.h>

#ifndef toggleMAX
#define toggleMAX 4
#endif

struct toggleTag
{
//>>>DECL
oosmos_sStateMachineNoQueue(ROOT);
oosmos_sLeaf Off_State;
oosmos_sLeaf On_State;
//<<<DECL

pin * m_pPin;
uint32_t m_TimeOnMS;
uint32_t m_TimeOffMS;
};

//>>>CODE
static bool Off_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
toggle * pToggle = (toggle *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_ENTER: {
return oosmos_StateTimeoutMS(pState, (uint32_t) pToggle->m_TimeOffMS);
}
case oosmos_TIMEOUT: {
return oosmos_Transition(pToggle, pState, On_State);
}
}

return false;
}
	[...]
static bool On_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
toggle * pToggle = (toggle *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_ENTER: {
pinOn(pToggle->m_pPin);
return oosmos_StateTimeoutMS(pState, (uint32_t) pToggle->m_TimeOnMS);
}
case oosmos_EXIT: {
pinOff(pToggle->m_pPin);
return true;
}
case oosmos_TIMEOUT: {
return oosmos_Transition(pToggle, pState, Off_State);
}
}

return false;
}
//<<<CODE

extern toggle * toggleNew(pin * pPin, uint32_t TimeOnMS, uint32_t TimeOffMS)
{
oosmos_Allocate(pToggle, toggle, toggleMAX, NULL);

//>>>INIT
oosmos_StateMachineInitNoQueue(pToggle, ROOT, NULL, On_State);
oosmos_LeafInit(pToggle, Off_State, ROOT, Off_State_Code);
oosmos_LeafInit(pToggle, On_State, ROOT, On_State_Code);
//<<<INIT

pToggle->m_pPin = pPin;
pToggle->m_TimeOnMS = TimeOnMS;
pToggle->m_TimeOffMS = TimeOffMS;

return pToggle;
}

oosmos/Classes/toggle_state.c

oosmos_TransitionAction causes a transition from the current state to the specified target state, executing an action function along the way. During this transition process, we execute all the nested oosmos_EXIT event handlers as we exit the from states, then call the action function, and then execute all the oosmos_ENTER event handlers as we enter into all the (possibly nested) states to the target state. (See lines 36 and 63.)

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bool oosmos_TransitionAction(pObject, pFromState, ToState, pEvent, pActionFunction);

Prototype

pObject	The address of the object that contains the state machine.
pFromState	The same `pState` argument that was passed into the containing state handler.
ToState	The name of the state we are transitioning to.
pEvent	The same `pEvent` argument that was passed into the containing state handler. It is passed through to the action function.
pActionFunction	`pActionFunction` is a pointer to a function to call after all oosmos_EXIT and before all oosmos_ENTER events are triggered.
RETURN	Always returns `true`.

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//	[MIT]
// OOSMOS Action Test
//
// Copyright (c) 2014-2026 OOSMOS, LLC
// SPDX-License-Identifier: MIT
//

#include "oosmos.h"	[...]
#include <stdbool.h>
#include <stdio.h>

//>>>EVENTS
//<<<EVENTS

typedef struct testTag test;

static unsigned Count;
static unsigned ActionCount;

struct testTag
{
//>>>DECL
oosmos_sStateMachineNoQueue(ROOT);
oosmos_sComposite A_State;
oosmos_sLeaf A_AA_State;
oosmos_sFinal A_Final1_State;
oosmos_sComposite B_State;
oosmos_sLeaf B_BB_State;
oosmos_sFinal B_Final2_State;
oosmos_sLeaf Exiting_State;
//<<<DECL

};

//>>>CODE
static void OOSMOS_Action_97af96b2(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

printf("Count: %u\n", Count);
ActionCount = Count;
printf("%s\n", oosmos_IsInState(pTest, &pTest->ROOT) ? "SUCCESS" : "FAILURE");

oosmos_UNUSED(pState);
oosmos_UNUSED(pEvent);
}

static bool A_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_EXIT: {
Count++;
return true;
}
case oosmos_DEFAULT: {
Count = 0;
printf("INITIAL\n");
return true;
}
case oosmos_COMPLETE: {
return oosmos_TransitionAction(pTest, pState, B_State, pEvent, OOSMOS_Action_97af96b2);
}
}

return false;
}

static bool A_AA_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)	[...]
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_EXIT: {
Count++;
return true;
}
case oosmos_COMPLETE: {
return oosmos_Transition(pTest, pState, A_Final1_State);
}
}

return false;
}

static bool B_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_ENTER: {
Count++;
return true;
}
case oosmos_COMPLETE: {
return oosmos_Transition(pTest, pState, Exiting_State);
}
}

return false;
}

static bool B_BB_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
test * pTest = (test *) pObject;

switch (oosmos_EventCode(pEvent)) {
case oosmos_ENTER: {
Count++;
return true;
}
case oosmos_COMPLETE: {
return oosmos_Transition(pTest, pState, B_Final2_State);
}
}

return false;
}

static bool Exiting_State_Code(void * pObject, oosmos_sState * pState, const oosmos_sEvent * pEvent)
{
switch (oosmos_EventCode(pEvent)) {
case oosmos_ENTER: {
printf("%s\n", ActionCount == 2 ? "SUCCESS" : "FAILURE");
oosmos_EndProgram(1);
return true;
}
}

oosmos_UNUSED(pObject);
oosmos_UNUSED(pState);
return false;
}
//<<<CODE

static test * testNew(void)
{
oosmos_Allocate(pTest, test, 1, NULL);

//>>>INIT
oosmos_StateMachineInitNoQueue(pTest, ROOT, NULL, A_State);
oosmos_CompositeInit(pTest, A_State, ROOT, A_AA_State, A_State_Code);
oosmos_LeafInit(pTest, A_AA_State, A_State, A_AA_State_Code);
oosmos_FinalInit(pTest, A_Final1_State, A_State, NULL);
oosmos_CompositeInit(pTest, B_State, ROOT, B_BB_State, B_State_Code);
oosmos_LeafInit(pTest, B_BB_State, B_State, B_BB_State_Code);
oosmos_FinalInit(pTest, B_Final2_State, B_State, NULL);
oosmos_LeafInit(pTest, Exiting_State, ROOT, Exiting_State_Code);

oosmos_Debug(pTest, NULL);
//<<<INIT

return pTest;
}

extern int main(void)
{
(void) testNew();

for (;;) {
oosmos_RunStateMachines();
oosmos_DelayMS(1);
}
}

oosmos/Tests/Action.c

oosmos_UNUSED assures that a reference is made to a function argument. Prevents compiler or LINT messages. Usually used by the OOSMOS code generator.

See Also

FOREVER, POINTER_GUARD

oosmos_US2Days_Rounded is a macro that converts microseconds to days with the result being rounded for better precision. If speed is more important than accuracy, see the truncated version of this macro.

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oosmos_US2Days_Rounded(Microseconds)

Macro

See Also

Days2Hours, Days2MS, Days2Minutes, Days2Seconds, Days2US, Divide_Integral_Rounded, Hours2Days_Rounded, Hours2Days_Truncated, Hours2MS, Hours2Minutes, Hours2Seconds, Hours2US, MS2Days_Rounded, MS2Days_Truncated, MS2Hours_Rounded, MS2Hours_Truncated, MS2Minutes_Rounded, MS2Minutes_Truncated, MS2Seconds_Rounded, MS2Seconds_Truncated, MS2US, Minutes2Days_Rounded, Minutes2Days_Truncated, Minutes2Hours_Rounded, Minutes2Hours_Truncated, Minutes2MS, Minutes2Seconds, Minutes2US, Seconds2Days_Rounded, Seconds2Days_Truncated, Seconds2Hours_Rounded, Seconds2Hours_Truncated, Seconds2MS, Seconds2Minutes_Rounded, Seconds2Minutes_Truncated, Seconds2US, US2Days_Truncated, US2Hours_Rounded, US2Hours_Truncated, US2MS_Rounded, US2MS_Truncated, US2Minutes_Rounded, US2Minutes_Truncated, US2Seconds_Rounded, US2Seconds_Truncated

oosmos_US2Days_Truncated is a macro that converts microseconds to days with the result being truncated due to default integral division behavior. If precision is important, see the rounded version of this macro.

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oosmos_US2Days_Truncated(Microseconds)

Macro

See Also

Days2Hours, Days2MS, Days2Minutes, Days2Seconds, Days2US, Divide_Integral_Rounded, Hours2Days_Rounded, Hours2Days_Truncated, Hours2MS, Hours2Minutes, Hours2Seconds, Hours2US, MS2Days_Rounded, MS2Days_Truncated, MS2Hours_Rounded, MS2Hours_Truncated, MS2Minutes_Rounded, MS2Minutes_Truncated, MS2Seconds_Rounded, MS2Seconds_Truncated, MS2US, Minutes2Days_Rounded, Minutes2Days_Truncated, Minutes2Hours_Rounded, Minutes2Hours_Truncated, Minutes2MS, Minutes2Seconds, Minutes2US, Seconds2Days_Rounded, Seconds2Days_Truncated, Seconds2Hours_Rounded, Seconds2Hours_Truncated, Seconds2MS, Seconds2Minutes_Rounded, Seconds2Minutes_Truncated, Seconds2US, US2Days_Rounded, US2Hours_Rounded, US2Hours_Truncated, US2MS_Rounded, US2MS_Truncated, US2Minutes_Rounded, US2Minutes_Truncated, US2Seconds_Rounded, US2Seconds_Truncated

oosmos_US2Hours_Rounded is a macro that converts microseconds to hours with the result being rounded for better precision. If speed is more important than accuracy, see the truncated version of this macro.

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oosmos_US2Hours_Rounded(Microseconds)

Macro

See Also

Days2Hours, Days2MS, Days2Minutes, Days2Seconds, Days2US, Divide_Integral_Rounded, Hours2Days_Rounded, Hours2Days_Truncated, Hours2MS, Hours2Minutes, Hours2Seconds, Hours2US, MS2Days_Rounded, MS2Days_Truncated, MS2Hours_Rounded, MS2Hours_Truncated, MS2Minutes_Rounded, MS2Minutes_Truncated, MS2Seconds_Rounded, MS2Seconds_Truncated, MS2US, Minutes2Days_Rounded, Minutes2Days_Truncated, Minutes2Hours_Rounded, Minutes2Hours_Truncated, Minutes2MS, Minutes2Seconds, Minutes2US, Seconds2Days_Rounded, Seconds2Days_Truncated, Seconds2Hours_Rounded, Seconds2Hours_Truncated, Seconds2MS, Seconds2Minutes_Rounded, Seconds2Minutes_Truncated, Seconds2US, US2Days_Rounded, US2Days_Truncated, US2Hours_Truncated, US2MS_Rounded, US2MS_Truncated, US2Minutes_Rounded, US2Minutes_Truncated, US2Seconds_Rounded, US2Seconds_Truncated

oosmos_US2Hours_Truncated is a macro that converts microseconds to hours with the result being truncated due to default integral division behavior. If precision is important, see the rounded version of this macro.

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oosmos_US2Hours_Truncated(Microseconds)

Macro

See Also

Days2Hours, Days2MS, Days2Minutes, Days2Seconds, Days2US, Divide_Integral_Rounded, Hours2Days_Rounded, Hours2Days_Truncated, Hours2MS, Hours2Minutes, Hours2Seconds, Hours2US, MS2Days_Rounded, MS2Days_Truncated, MS2Hours_Rounded, MS2Hours_Truncated, MS2Minutes_Rounded, MS2Minutes_Truncated, MS2Seconds_Rounded, MS2Seconds_Truncated, MS2US, Minutes2Days_Rounded, Minutes2Days_Truncated, Minutes2Hours_Rounded, Minutes2Hours_Truncated, Minutes2MS, Minutes2Seconds, Minutes2US, Seconds2Days_Rounded, Seconds2Days_Truncated, Seconds2Hours_Rounded, Seconds2Hours_Truncated, Seconds2MS, Seconds2Minutes_Rounded, Seconds2Minutes_Truncated, Seconds2US, US2Days_Rounded, US2Days_Truncated, US2Hours_Rounded, US2MS_Rounded, US2MS_Truncated, US2Minutes_Rounded, US2Minutes_Truncated, US2Seconds_Rounded, US2Seconds_Truncated

oosmos_US2Minutes_Rounded is a macro that converts microseconds to minutes with the result being rounded for better precision. If speed is more important than accuracy, see the truncated version of this macro.

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oosmos_US2Minutes_Rounded(Microseconds)

Macro

See Also

Days2Hours, Days2MS, Days2Minutes, Days2Seconds, Days2US, Divide_Integral_Rounded, Hours2Days_Rounded, Hours2Days_Truncated, Hours2MS, Hours2Minutes, Hours2Seconds, Hours2US, MS2Days_Rounded, MS2Days_Truncated, MS2Hours_Rounded, MS2Hours_Truncated, MS2Minutes_Rounded, MS2Minutes_Truncated, MS2Seconds_Rounded, MS2Seconds_Truncated, MS2US, Minutes2Days_Rounded, Minutes2Days_Truncated, Minutes2Hours_Rounded, Minutes2Hours_Truncated, Minutes2MS, Minutes2Seconds, Minutes2US, Seconds2Days_Rounded, Seconds2Days_Truncated, Seconds2Hours_Rounded, Seconds2Hours_Truncated, Seconds2MS, Seconds2Minutes_Rounded, Seconds2Minutes_Truncated, Seconds2US, US2Days_Rounded, US2Days_Truncated, US2Hours_Rounded, US2Hours_Truncated, US2MS_Rounded, US2MS_Truncated, US2Minutes_Truncated, US2Seconds_Rounded, US2Seconds_Truncated

oosmos_US2Minutes_Truncated is a macro that converts microseconds to minutes with the result being truncated due to default integral division behavior. If precision is important, see the rounded version of this macro.

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oosmos_US2Minutes_Truncated(Microseconds)

Macro

See Also

Days2Hours, Days2MS, Days2Minutes, Days2Seconds, Days2US, Divide_Integral_Rounded, Hours2Days_Rounded, Hours2Days_Truncated, Hours2MS, Hours2Minutes, Hours2Seconds, Hours2US, MS2Days_Rounded, MS2Days_Truncated, MS2Hours_Rounded, MS2Hours_Truncated, MS2Minutes_Rounded, MS2Minutes_Truncated, MS2Seconds_Rounded, MS2Seconds_Truncated, MS2US, Minutes2Days_Rounded, Minutes2Days_Truncated, Minutes2Hours_Rounded, Minutes2Hours_Truncated, Minutes2MS, Minutes2Seconds, Minutes2US, Seconds2Days_Rounded, Seconds2Days_Truncated, Seconds2Hours_Rounded, Seconds2Hours_Truncated, Seconds2MS, Seconds2Minutes_Rounded, Seconds2Minutes_Truncated, Seconds2US, US2Days_Rounded, US2Days_Truncated, US2Hours_Rounded, US2Hours_Truncated, US2MS_Rounded, US2MS_Truncated, US2Minutes_Rounded, US2Seconds_Rounded, US2Seconds_Truncated

oosmos_US2MS_Rounded is a macro that converts microseconds to milliseconds with the result being rounded for better precision. If speed is more important than accuracy, see the truncated version of this macro.

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oosmos_US2MS_Rounded(Microseconds)

Macro

See Also

Days2Hours, Days2MS, Days2Minutes, Days2Seconds, Days2US, Divide_Integral_Rounded, Hours2Days_Rounded, Hours2Days_Truncated, Hours2MS, Hours2Minutes, Hours2Seconds, Hours2US, MS2Days_Rounded, MS2Days_Truncated, MS2Hours_Rounded, MS2Hours_Truncated, MS2Minutes_Rounded, MS2Minutes_Truncated, MS2Seconds_Rounded, MS2Seconds_Truncated, MS2US, Minutes2Days_Rounded, Minutes2Days_Truncated, Minutes2Hours_Rounded, Minutes2Hours_Truncated, Minutes2MS, Minutes2Seconds, Minutes2US, Seconds2Days_Rounded, Seconds2Days_Truncated, Seconds2Hours_Rounded, Seconds2Hours_Truncated, Seconds2MS, Seconds2Minutes_Rounded, Seconds2Minutes_Truncated, Seconds2US, US2Days_Rounded, US2Days_Truncated, US2Hours_Rounded, US2Hours_Truncated, US2MS_Truncated, US2Minutes_Rounded, US2Minutes_Truncated, US2Seconds_Rounded, US2Seconds_Truncated

oosmos_US2MS_Truncated is a macro that converts microseconds to milliseconds with the result being truncated due to default integral division behavior. If precision is important, see the rounded version of this macro.

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oosmos_US2MS_Truncated(Microseconds)

Macro

See Also

Days2Hours, Days2MS, Days2Minutes, Days2Seconds, Days2US, Divide_Integral_Rounded, Hours2Days_Rounded, Hours2Days_Truncated, Hours2MS, Hours2Minutes, Hours2Seconds, Hours2US, MS2Days_Rounded, MS2Days_Truncated, MS2Hours_Rounded, MS2Hours_Truncated, MS2Minutes_Rounded, MS2Minutes_Truncated, MS2Seconds_Rounded, MS2Seconds_Truncated, MS2US, Minutes2Days_Rounded, Minutes2Days_Truncated, Minutes2Hours_Rounded, Minutes2Hours_Truncated, Minutes2MS, Minutes2Seconds, Minutes2US, Seconds2Days_Rounded, Seconds2Days_Truncated, Seconds2Hours_Rounded, Seconds2Hours_Truncated, Seconds2MS, Seconds2Minutes_Rounded, Seconds2Minutes_Truncated, Seconds2US, US2Days_Rounded, US2Days_Truncated, US2Hours_Rounded, US2Hours_Truncated, US2MS_Rounded, US2Minutes_Rounded, US2Minutes_Truncated, US2Seconds_Rounded, US2Seconds_Truncated

oosmos_US2Seconds_Rounded is a macro that converts microseconds to seconds with the result being rounded for better precision. If speed is more important than accuracy, see the truncated version of this macro.

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oosmos_US2Seconds_Rounded(Microseconds)

Macro

See Also

Days2Hours, Days2MS, Days2Minutes, Days2Seconds, Days2US, Divide_Integral_Rounded, Hours2Days_Rounded, Hours2Days_Truncated, Hours2MS, Hours2Minutes, Hours2Seconds, Hours2US, MS2Days_Rounded, MS2Days_Truncated, MS2Hours_Rounded, MS2Hours_Truncated, MS2Minutes_Rounded, MS2Minutes_Truncated, MS2Seconds_Rounded, MS2Seconds_Truncated, MS2US, Minutes2Days_Rounded, Minutes2Days_Truncated, Minutes2Hours_Rounded, Minutes2Hours_Truncated, Minutes2MS, Minutes2Seconds, Minutes2US, Seconds2Days_Rounded, Seconds2Days_Truncated, Seconds2Hours_Rounded, Seconds2Hours_Truncated, Seconds2MS, Seconds2Minutes_Rounded, Seconds2Minutes_Truncated, Seconds2US, US2Days_Rounded, US2Days_Truncated, US2Hours_Rounded, US2Hours_Truncated, US2MS_Rounded, US2MS_Truncated, US2Minutes_Rounded, US2Minutes_Truncated, US2Seconds_Truncated

oosmos_US2Seconds_Truncated is a macro that converts microseconds to seconds with the result being truncated due to default integral division behavior. If precision is important, see the rounded version of this macro.

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oosmos_US2Seconds_Truncated(Microseconds)

Macro

See Also

Days2Hours, Days2MS, Days2Minutes, Days2Seconds, Days2US, Divide_Integral_Rounded, Hours2Days_Rounded, Hours2Days_Truncated, Hours2MS, Hours2Minutes, Hours2Seconds, Hours2US, MS2Days_Rounded, MS2Days_Truncated, MS2Hours_Rounded, MS2Hours_Truncated, MS2Minutes_Rounded, MS2Minutes_Truncated, MS2Seconds_Rounded, MS2Seconds_Truncated, MS2US, Minutes2Days_Rounded, Minutes2Days_Truncated, Minutes2Hours_Rounded, Minutes2Hours_Truncated, Minutes2MS, Minutes2Seconds, Minutes2US, Seconds2Days_Rounded, Seconds2Days_Truncated, Seconds2Hours_Rounded, Seconds2Hours_Truncated, Seconds2MS, Seconds2Minutes_Rounded, Seconds2Minutes_Truncated, Seconds2US, US2Days_Rounded, US2Days_Truncated, US2Hours_Rounded, US2Hours_Truncated, US2MS_Rounded, US2MS_Truncated, US2Minutes_Rounded, US2Minutes_Truncated, US2Seconds_Rounded

oosmos_ActiveObjectInit

oosmos_Allocate

oosmos_AllocateVisible

oosmos_AnalogMapAccurate

oosmos_AnalogMapFast

oosmos_ASSERT

oosmos_ChoiceInit

oosmos_ClockSpeedInMHz

oosmos_COMPLETE

oosmos_CompositeInit

oosmos_Days2Hours

oosmos_Days2Minutes

oosmos_Days2MS

oosmos_Days2Seconds

oosmos_Days2US

oosmos_Debug

oosmos_DebugPrint

oosmos_DEFAULT

oosmos_DelayMS

oosmos_DelaySeconds

oosmos_DelayUS

oosmos_Divide_Integral_Rounded

oosmos_EMPTY_EVENT

oosmos_EndProgram

oosmos_ENTER

oosmos_EventCode

oosmos_EventQueue

oosmos_EXIT

oosmos_FinalInit

oosmos_FOREVER

oosmos_GetClockSpeedInMHz

oosmos_GetCurrentEvent

oosmos_GetFreeRunningUS

oosmos_HexDump

oosmos_HistoryInit

oosmos_Hours2Days_Rounded

oosmos_Hours2Days_Truncated

oosmos_Hours2Minutes

oosmos_Hours2MS

oosmos_Hours2Seconds

oosmos_Hours2US

oosmos_IsInState

oosmos_LeafInit

oosmos_Max

oosmos_Min

oosmos_Minutes2Days_Rounded

oosmos_Minutes2Days_Truncated

oosmos_Minutes2Hours_Rounded

oosmos_Minutes2Hours_Truncated

oosmos_Minutes2MS

oosmos_Minutes2Seconds

oosmos_Minutes2US

oosmos_MS2Days_Rounded

oosmos_MS2Days_Truncated

oosmos_MS2Hours_Rounded

oosmos_MS2Hours_Truncated

oosmos_MS2Minutes_Rounded

oosmos_MS2Minutes_Truncated

oosmos_MS2Seconds_Rounded

oosmos_MS2Seconds_Truncated

oosmos_MS2US

oosmos_NOP

oosmos_ObjectThreadInit

oosmos_ObjectThreadRestart

oosmos_ObjectThreadStart

oosmos_ObjectThreadStop

oosmos_ORTHO

oosmos_OrthoInit

oosmos_OrthoRegionInit

oosmos_POINTER_GUARD

oosmos_POLL

oosmos_PushEvent

oosmos_PushEventCode

oosmos_QueueConstruct

oosmos_QueuePop

oosmos_QueuePush

oosmos_QueueSetBehaviorFunc

oosmos_RunStateMachine

oosmos_RunStateMachines

oosmos_sActiveObject