FreeRTOS 任务间同步和通信方法

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我是靠谱客的博主无奈芒果，这篇文章主要介绍FreeRTOS 任务间同步和通信方法，现在分享给大家，希望可以做个参考。

以下在CMSIS V2代码下实现，不区分是否中断安全。

1、信号量 semaphores

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/* Definitions for adcFinishedBinSem */
osSemaphoreId_t adcFinishedBinSemHandle;
const osSemaphoreAttr_t adcFinishedBinSem_attributes = {
  .name = "adcFinishedBinSem"
};

/* Create the semaphores(s) */
/* creation of adcFinishedBinSem */
adcFinishedBinSemHandle = osSemaphoreNew(1, 1, &adcFinishedBinSem_attributes);

/* How to use */
osSemaphoreRelease(adcFinishedBinSemHandle);
osSemaphoreAcquire(adcFinishedBinSemHandle,osWaitForever);

2、事件标志 EventFlag

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/* Definitions for pcADCCmdEvent */
osEventFlagsId_t pcADCCmdEventHandle;
const osEventFlagsAttr_t pcADCCmdEvent_attributes = {
  .name = "pcADCCmdEvent"
};

/* creation of pcADCCmdEvent */
pcADCCmdEventHandle = osEventFlagsNew(&pcADCCmdEvent_attributes);

/* how to use: osFlagsNoClear,osFlagsWaitAny,osFlagsWaitAll*/
#define ADC_CTRL    ( 1 << 0 )

osEventFlagsSet(pcADCReadEventHandle, ADC_CTRL);

osEventFlagsClear(pcADCReadEventHandle, ADC_CTRL);

pcADCReadEvenFlag = osEventFlagsWait(pcADCReadEventHandle, ADC_CTRL, osFlagsNoClear, osWaitForever); 
if((pcADCReadEvenFlag&0x01) == 0x01){
    
}

3、互斥 Mutex

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/* Definitions for algorithmResutMutex */
osMutexId_t algorithmResutMutexHandle;
const osMutexAttr_t algorithmResutMutex_attributes = {
  .name = "algorithmResutMutex"
};

/* creation of algorithmResutMutex */
algorithmResutMutexHandle = osMutexNew(&algorithmResutMutex_attributes);

/* how to use */
osMutexWait(algorithmResutMutexHandle,osWaitForever);
osMutexRelease(algorithmResutMutexHandle);

3、消息队列 Queue

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/* Definitions for usartRxMsgQueue */
osMessageQueueId_t usartRxMsgQueueHandle;
const osMessageQueueAttr_t usartRxMsgQueue_attributes = {
  .name = "usartRxMsgQueue"
};

/* Create the queue(s) */
/* creation of usartRxMsgQueue */
usartRxMsgQueueHandle = osMessageQueueNew(2, sizeof(USART_RECEIVETYPE), &usartRxMsgQueue_attributes);

/* how to use */
osMessageQueuePut(usartRxMsgQueueHandle,&Uart1Rx,1,0);
osMessageQueueGet(usartRxMsgQueueHandle,(void*)&pUARTRx,NULL,osWaitForever);