1.任务句柄

/* LED任务句柄 */
static TaskHandle_t LED_Task_Handle;		

2.任务创建函数

BaseType_t xTaskCreate(	TaskFunction_t pxTaskCode,							//任务函数const char * const pcName,						//任务名称const uint16_t usStackDepth,					//堆栈大小void * const pvParameters,						//形参UBaseType_t uxPriority,							//优先级TaskHandle_t * const pxCreatedTask )			//任务句柄{TCB_t *pxNewTCB;BaseType_t xReturn;/* If the stack grows down then allocate the stack then the TCB so the stackdoes not grow into the TCB.  Likewise if the stack grows up then allocatethe TCB then the stack. */#if( portSTACK_GROWTH > 0 ){/* Allocate space for the TCB.  Where the memory comes from depends onthe implementation of the port malloc function and whether or not staticallocation is being used. */pxNewTCB = ( TCB_t * ) pvPortMalloc( sizeof( TCB_t ) );if( pxNewTCB != NULL ){/* Allocate space for the stack used by the task being created.The base of the stack memory stored in the TCB so the task canbe deleted later if required. */pxNewTCB->pxStack = ( StackType_t * ) pvPortMalloc( ( ( ( size_t ) usStackDepth ) * sizeof( StackType_t ) ) ); /*lint !e961 MISRA exception as the casts are only redundant for some ports. */if( pxNewTCB->pxStack == NULL ){/* Could not allocate the stack.  Delete the allocated TCB. */vPortFree( pxNewTCB );pxNewTCB = NULL;}}}#else /* portSTACK_GROWTH */{StackType_t *pxStack;/* 给任务分配堆栈 */pxStack = ( StackType_t * ) pvPortMalloc( ( ( ( size_t ) usStackDepth ) * sizeof( StackType_t ) ) ); /*lint !e961 MISRA exception as the casts are only redundant for some ports. */if( pxStack != NULL ){/* 给任务控制块TCB申请内存 */pxNewTCB = ( TCB_t * ) pvPortMalloc( sizeof( TCB_t ) ); /*lint !e961 MISRA exception as the casts are only redundant for some paths. */if( pxNewTCB != NULL ){/* 指向分配的内存地址. */pxNewTCB->pxStack = pxStack;}else{/* 创建失败，释放内存. */vPortFree( pxStack );}}else{pxNewTCB = NULL;}}#endif /* portSTACK_GROWTH */if( pxNewTCB != NULL ){#if( tskSTATIC_AND_DYNAMIC_ALLOCATION_POSSIBLE != 0 ){/* Tasks can be created statically or dynamically, so note thistask was created dynamically in case it is later deleted. */pxNewTCB->ucStaticallyAllocated = tskDYNAMICALLY_ALLOCATED_STACK_AND_TCB;}#endif /* configSUPPORT_STATIC_ALLOCATION */prvInitialiseNewTask( pxTaskCode, pcName, ( uint32_t ) usStackDepth, pvParameters, uxPriority, pxCreatedTask, pxNewTCB, NULL );	//初始化任务控制块prvAddNewTaskToReadyList( pxNewTCB );	//加入就绪列表中xReturn = pdPASS;}else{xReturn = errCOULD_NOT_ALLOCATE_REQUIRED_MEMORY;}return xReturn;}

举例：

BaseType_t ret = pdPASS;/* 创建动态任务 */ret = xTaskCreate((TaskFunction_t	)LED_Task,								//任务函数(const char* 	)"LED_Task",	//任务名称(uint32_t 		)512,					//内存大小(void* 		  	)NULL,					//´形参(UBaseType_t 	)2, 				//优先级&LED_Task_Handle);				//句柄if(pdPASS == ret)/* 任务创建成功 */printf("LED_Task创建成功！\n");elseprintf("LED_Task创建失败！\n");

3.任务函数实现

TaskFunction_t pxTaskCode			//函数指针指向一个void func(void*)函数
/** Defines the prototype to which task functions must conform.  Defined in this* file to ensure the type is known before portable.h is included.*/
typedef void (*TaskFunction_t)( void * );		//任务函数实现
static void LED_Task(void* parameter)
{	while (1){HAL_GPIO_WritePin(LD1_GPIO_Port, LD1_Pin, (GPIO_PinState)SET);vTaskDelay(500);   printf("LED_Task Running,LED1_ON\r\n");HAL_GPIO_WritePin(LD1_GPIO_Port, LD1_Pin, (GPIO_PinState)RESET);   vTaskDelay(500);   	 		printf("LED_Task Running,LED1_OFF\r\n");}
}

4.任务的删除

 void vTaskDelete( TaskHandle_t xTaskToDelete ); //将任务从就绪列表及任务列表中删除，形参xTaskToDelete 为任务句柄