FreeRTOS二值信号量

#if( configSUPPORT_DYNAMIC_ALLOCATION == 1 )
#define xSemaphoreCreateBinary() xQueueGenericCreate( ( UBaseType_t ) 1,
semSEMAPHORE_QUEUE_ITEM_LENGTH, queueQUEUE_TYPE_BINARY_SEMAPHORE )

QueueHandle_t xQueueGenericCreate( const UBaseType_t uxQueueLength,
const UBaseType_t uxItemSize, const uint8_t ucQueueType )
#endif

#define xSemaphoreGive( xSemaphore )
xQueueGenericSend( ( QueueHandle_t ) ( xSemaphore ), NULL, semGIVE_BLOCK_TIME, queueSEND_TO_BACK )
BaseType_t xQueueGenericSend( QueueHandle_t xQueue, const void * const pvItemToQueue,
TickType_t xTicksToWait, const BaseType_t xCopyPosition )

#define xSemaphoreGiveFromISR( xSemaphore, pxHigherPriorityTaskWoken )
xQueueGiveFromISR( ( QueueHandle_t ) ( xSemaphore ), ( pxHigherPriorityTaskWoken ) )
BaseType_t xQueueGiveFromISR( QueueHandle_t xQueue, BaseType_t * const pxHigherPriorityTaskWoken )

#define xSemaphoreTake( xSemaphore, xBlockTime )
xQueueGenericReceive( ( QueueHandle_t ) ( xSemaphore ), NULL, ( xBlockTime ), pdFALSE )
BaseType_t xQueueGenericReceive( QueueHandle_t xQueue, void * const pvBuffer,
TickType_t xTicksToWait, const BaseType_t xJustPeeking )

#define xSemaphoreTakeFromISR( xSemaphore, pxHigherPriorityTaskWoken )
xQueueReceiveFromISR( ( QueueHandle_t ) ( xSemaphore ), NULL, ( pxHigherPriorityTaskWoken ) )
BaseType_t xQueueReceiveFromISR( QueueHandle_t xQueue, void * const pvBuffer,
BaseType_t * const pxHigherPriorityTaskWoken )

u8 data;

void start_task(void *pvParameters)
{
//创建二值信号量
BinarySemaphore = xSemaphoreCreateBinary();
}

void USART1_IRQHandler(void)
{
if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)
{
data = USART_ReceiveData(USART1);

xSemaphoreGiveFromISR(BinarySemaphore, &xHigherPriorityTaskWoken);  //释放二值信号量

portYIELD_FROM_ISR(xHigherPriorityTaskWoken);
}
}

void data_task(void *pvParameters)
{
BaseType_t ret;

while(1)
{
ret = xSemaphoreTake(BinarySemaphore,portMAX_DELAY);
if(ret == pdTRUE)
{
printf("data %c\r\n", data);
}

vTaskDelay(10);
}
}