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FreeRTOS-计数型信号量

news 2025/8/23 13:18:42

实验目的

创建一个计数型信号量，按下 KEY1 则释放信号量，按下 KEY2 获取信号量。

实验代码

void StartTtaskGive(void const * argument)
{
  /* USER CODE BEGIN StartTtaskGive */
  /* Infinite loop */
  for(;;)
  {
      if(HAL_GPIO_ReadPin(GPIOA,GPIO_PIN_0) == GPIO_PIN_RESET)
      {
          osDelay(20);
          if(HAL_GPIO_ReadPin(GPIOA,GPIO_PIN_0) == GPIO_PIN_RESET)
          {
              if(xSemaphoreGive(myCountingSemHandle) == pdTRUE)
                  printf("计数型信号量放入成功\r\n");
              else
                  printf("计数型信号量放入失败\r\n");
          }
          while(HAL_GPIO_ReadPin(GPIOA,GPIO_PIN_0) == GPIO_PIN_RESET);
      }
    osDelay(10);
  }
  /* USER CODE END StartTtaskGive */
}

/* USER CODE BEGIN Header_StartTaskTake */
/**
* @brief Function implementing the taskTake thread.
* @param argument: Not used
* @retval None
*/
/* USER CODE END Header_StartTaskTake */
void StartTaskTake(void const * argument)
{
  /* USER CODE BEGIN StartTaskTake */
  /* Infinite loop */
  for(;;)
  {
    if(HAL_GPIO_ReadPin(GPIOA,GPIO_PIN_1) == GPIO_PIN_RESET)
      {
          osDelay(20);
          if(HAL_GPIO_ReadPin(GPIOA,GPIO_PIN_1) == GPIO_PIN_RESET)
          {
              if(xSemaphoreTake(myCountingSemHandle,0) == pdTRUE)
                  printf("计数型信号量获取成功\r\n");
              else
                  printf("计数型信号量获取失败\r\n");
          }
          while(HAL_GPIO_ReadPin(GPIOA,GPIO_PIN_1) == GPIO_PIN_RESET);
      }
    osDelay(10);
  }
  /* USER CODE END StartTaskTake */
}