信号量

二值信号量

SemaphoreHandle_t sem_handle;

sem_handle = xSemaphoreCreateBinary();

static void send_Task(void* pvParameters)
{
    while(1)
    {
        xSemaphoreGive(sem_handle);
        vTaskDelay(1000);
    }
    
}

static void receive_Task(void* pvParameters)
{
    while (1)
    {
        xSemaphoreTake(sem_handle, portMAX_DELAY);
        printf("接收二值信号量\r\n");
    }
}

计数信号量

SemaphoreHandle_t sem_count_handle;

sem_count_handle = xSemaphoreCreateCounting(5, 5);

static void send_Task(void* pvParameters)
{
    while(1)
    {
        vTaskDelay(1000);
        xSemaphoreGive(sem_count_handle);
        
    }
}

static void receive_Task(void* pvParameters)
{
    while (1)
    {
        xSemaphoreTake(sem_count_handle, portMAX_DELAY);
        printf("接收计数信号量\r\n");
    }
}