使用 IDLE 中断接收，稍微修改了hal库，但是都是在begin end中修改，重新在cube中生成代码不会去掉这部分内容，不见原理，原理部分请参考编程手册，只讲做法。

1.在stm32f4xx_it,c中修改

void USART1_IRQHandler(void)

{

  /* USER CODE BEGIN USART1_IRQn 0 */

  uint32_t isrflags   = READ_REG(huart1.Instance->SR);

  uint32_t cr1its     = READ_REG(huart1.Instance->CR1);

if(((isrflags & USART_SR_IDLE) != RESET) && ((cr1its & USART_CR1_IDLEIE))) 

{

HAL_UART_IDLECallback(&huart1);

__HAL_UART_CLEAR_IDLEFLAG(&huart1);

huart1.RxState = HAL_UART_STATE_READY;

}  

  /* USER CODE END USART1_IRQn 0 */

  HAL_UART_IRQHandler(&huart1);

  /* USER CODE BEGIN USART1_IRQn 1 */

  /* USER CODE END USART1_IRQn 1 */

}

2.在生成的uart.c文件加入，并且在.h中声明

__weak void HAL_UART_IDLECallback(UART_HandleTypeDef *huart)

{

(void)huart;

}

3.在应用程序中使能IDLE中断

void task1_Fxn(void *p)

{

__HAL_UART_ENABLE_IT(&huart1,UART_IT_IDLE);

status = HAL_UART_Receive_DMA(&huart1,uart_buffer,100);

while(1)

{

HAL_GPIO_TogglePin(GPIOC,GPIO_PIN_0);

vTaskSuspend(NULL);

//在这里添加接收到串口数据的处理

HAL_UART_AbortReceive(&huart1);

HAL_UART_Receive_DMA(&huart1,uart_buffer,100);

}

}

4.IDLE回调函数

void HAL_UART_IDLECallback(UART_HandleTypeDef *huart)

{

xTaskResumeFromISR(task1Handle);

}