HAL_UART_Receive_IT只运行一次

uint8_t rcvd, count = 0, reception_complete = FALSE;
char buffer[100];
int main(void)
    HAL_Init();
    SystemClockConfig();
    UART2_Init();
    __HAL_UART_ENABLE_IT(&huart2, UART_IT_RXNE);
    while(1){
        if(reception_complete == FALSE) {
            HAL_UART_Receive_IT(&huart2, &rcvd, 1);
        else {
            ReturnProcessedString();
            reception_complete = FALSE;
    return 0;
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
    if (huart->Instance == USART2)
        if(rcvd == '\r'){
            reception_complete = TRUE;
            buffer[count++] = '\r';
            count = 0;
        }else {
            buffer[count++] = rcvd;
}

volatile uint8_t rxd[10];
int main(void)
  /* USER CODE BEGIN 1 */
  /* USER CODE END 1 */
  /* MCU Configuration--------------------------------------------------------*/
  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
  HAL_Init();
  /* USER CODE BEGIN Init */
  /* USER CODE END Init */
  /* Configure the system clock */
  SystemClock_Config();
  /* USER CODE BEGIN SysInit */
  /* USER CODE END SysInit */
  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_UART7_Init();
  MX_UART8_Init();
  MX_USART1_UART_Init();
  MX_USART2_UART_Init();
  MX_USART3_UART_Init();
  MX_USART6_UART_Init();
  /* USER CODE BEGIN 2 */
    HAL_UART_Receive_IT(&huart6, (uint8_t *)rxd, 1);
  /* USER CODE END 2 */
  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
    /* USER CODE END WHILE */
    /* USER CODE BEGIN 3 */
  /* USER CODE END 3 */
int a=0;
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *UartHandle)
    if(UartHandle->Instance == USART6)
        if (a%100==0)
            HAL_UART_Transmit(&huart3, (uint8_t *)rxd, 1, 0xFFFF);
        HAL_UART_Receive_IT(&huart6, (uint8_t *)rxd, 1);
static void MX_USART3_UART_Init(void)
  /* USER CODE BEGIN USART3_Init 0 */
  /* USER CODE END USART3_Init 0 */
  /* USER CODE BEGIN USART3_Init 1 */
  /* USER CODE END USART3_Init 1 */
  huart3.Instance = USART3;
  huart3.Init.BaudRate = 9600;
  huart3.Init.WordLength = UART_WORDLENGTH_8B;
  huart3.Init.StopBits = UART_STOPBITS_1;
  huart3.Init.Parity = UART_PARITY_NONE;
  huart3.Init.Mode = UART_MODE_TX_RX;
  huart3.Init.HwFlowCtl = UART_HWCONTROL_NONE;
  huart3.Init.OverSampling = UART_OVERSAMPLING_16;
  huart3.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
  huart3.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
  if (HAL_UART_Init(&huart3) != HAL_OK)
    Error_Handler();
  /* USER CODE BEGIN USART3_Init 2 */
  /* USER CODE END USART3_Init 2 */
static void MX_USART6_UART_Init(void)
  /* USER CODE BEGIN USART6_Init 0 */
  /* USER CODE END USART6_Init 0 */
  /* USER CODE BEGIN USART6_Init 1 */
  /* USER CODE END USART6_Init 1 */
  huart6.Instance = USART6;
  huart6.Init.BaudRate = 9600;
  huart6.Init.WordLength = UART_WORDLENGTH_8B;
  huart6.Init.StopBits = UART_STOPBITS_1;
  huart6.Init.Parity = UART_PARITY_NONE;
  huart6.Init.Mode = UART_MODE_TX_RX;
  huart6.Init.HwFlowCtl = UART_HWCONTROL_NONE;
  huart6.Init.OverSampling = UART_OVERSAMPLING_16;
  huart6.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
  huart6.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
  if (HAL_UART_Init(&huart6) != HAL_OK)
    Error_Handler();
  /* USER CODE BEGIN USART6_Init 2 */
  /* USER CODE END USART6_Init 2 */
}

void USART3_IRQHandler(void)
  /* USER CODE BEGIN USART3_IRQn 0 */
  /* USER CODE END USART3_IRQn 0 */
  HAL_UART_IRQHandler(&huart3);
  /* USER CODE BEGIN USART3_IRQn 1 */
  /* USER CODE END USART3_IRQn 1 */
void USART6_IRQHandler(void)
  /* USER CODE BEGIN USART6_IRQn 0 */
  /* USER CODE END USART6_IRQn 0 */

HAL_UART_Receive_IT只运行一次

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