STM32L4R5ZI串口接收中断的问题

chenbingjy

我用STM32CUBEMX生成了一个STM32L4R5ZI的串口程序，使能了接收中断。
部分代码：

1. static void MX_USART1_UART_Init(void)
   
2. {
   
3. 
   
4.   /* USER CODE BEGIN USART1_Init 0 */
   
5. 
   
6.   /* USER CODE END USART1_Init 0 */
   
7. 
   
8.   /* USER CODE BEGIN USART1_Init 1 */
   
9. 
   
10.   /* USER CODE END USART1_Init 1 */
    
11.   huart1.Instance = USART1;
    
12.   huart1.Init.BaudRate = 9600;
    
13.   huart1.Init.WordLength = UART_WORDLENGTH_8B;
    
14.   huart1.Init.StopBits = UART_STOPBITS_1;
    
15.   huart1.Init.Parity = UART_PARITY_NONE;
    
16.   huart1.Init.Mode = UART_MODE_TX_RX;
    
17.   huart1.Init.HwFlowCtl = UART_HWCONTROL_NONE;
    
18.   huart1.Init.OverSampling = UART_OVERSAMPLING_16;
    
19.   huart1.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
    
20.   huart1.Init.ClockPrescaler = UART_PRESCALER_DIV1;
    
21.   huart1.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
    
22.   if (HAL_UART_Init(&huart1) != HAL_OK)
    
23.   {
    
24.     Error_Handler();
    
25.   }
    
26.   if (HAL_UARTEx_SetTxFifoThreshold(&huart1, UART_TXFIFO_THRESHOLD_1_8) != HAL_OK)
    
27.   {
    
28.     Error_Handler();
    
29.   }
    
30.   if (HAL_UARTEx_SetRxFifoThreshold(&huart1, UART_RXFIFO_THRESHOLD_1_8) != HAL_OK)
    
31.   {
    
32.     Error_Handler();
    
33.   }
    
34.   if (HAL_UARTEx_DisableFifoMode(&huart1) != HAL_OK)
    
35.   {
    
36.     Error_Handler();
    
37.   }
    
38.         HAL_UART_Receive_IT(&huart1, (uint8_t *)buffer, 1);
    
39.         //HAL_NVIC_SetPriority(USART1_IRQn,0,0);
    
40.         //HAL_NVIC_EnableIRQ(USART1_IRQn);
    
41.   /* USER CODE BEGIN USART1_Init 2 */
    
42. 
    
43.   /* USER CODE END USART1_Init 2 */
    
44. 
    
45. }

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中断处理函数：

1. void USART1_IRQHandler(void)
   
2. {
   
3.   /* USER CODE BEGIN USART1_IRQn 0 */
   
4. 
   
5.   /* USER CODE END USART1_IRQn 0 */
   
6.   HAL_UART_IRQHandler(&huart1);
   
7.   /* USER CODE BEGIN USART1_IRQn 1 */
   
8. 
   
9.   /* USER CODE END USART1_IRQn 1 */
   
10. }

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1. void HAL_UART_IRQHandler(UART_HandleTypeDef *huart)
   
2. {
   
3.   uint32_t isrflags   = READ_REG(huart->Instance->ISR);
   
4.   uint32_t cr1its     = READ_REG(huart->Instance->CR1);
   
5.   uint32_t cr3its     = READ_REG(huart->Instance->CR3);
   
6. 
   
7.   uint32_t errorflags;
   
8.   uint32_t errorcode;
   
9.         //uint8_t buffer[1];
   
10.   /* If no error occurs */
    
11.   errorflags = (isrflags & (uint32_t)(USART_ISR_PE | USART_ISR_FE | USART_ISR_ORE | USART_ISR_NE | USART_ISR_RTOF));
    
12.   if (errorflags == 0U)
    
13.   {
    
14.     /* UART in mode Receiver ---------------------------------------------------*/
    
15. #if defined(USART_CR1_FIFOEN)
    
16.     if (((isrflags & USART_ISR_RXNE_RXFNE) != 0U)
    
17.         && (((cr1its & USART_CR1_RXNEIE_RXFNEIE) != 0U)
    
18.             || ((cr3its & USART_CR3_RXFTIE) != 0U)))
    
19. #else
    
20.     if (((isrflags & USART_ISR_RXNE) != 0U)
    
21.         && ((cr1its & USART_CR1_RXNEIE) != 0U))
    
22. #endif /* USART_CR1_FIFOEN */
    
23.     {
    
24.       if (huart->RxISR != NULL)
    
25.       {
    
26.         huart->RxISR(huart);
    
27.                                 __HAL_UART_CLEAR_IDLEFLAG(&huart1);
    
28.                                 __HAL_UART_SEND_REQ(huart, UART_RXDATA_FLUSH_REQUEST);
    
29.                                 HAL_UART_Receive(&huart1,buffer,1,1000);
    
30.                                 HAL_UART_Transmit(&huart1,buffer,1,1000);
    
31.       }

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我试图先接收一个字节数据，然后再发送出去。
可是只能接收一个字节，我想可能是没有清中断标志。
我不知道怎么清，找了两个函数：
__HAL_UART_CLEAR_IDLEFLAG(&huart1);
__HAL_UART_SEND_REQ(huart, UART_RXDATA_FLUSH_REQUEST);
可是还是不管用。请高手指教，谢谢！