STM32 串口接收中断被莫名关闭

使用cubeide+stm32f4进行调试，发现UART4串口会被莫名的关掉，导致不能接收数据，经过排查如下：

HAL_StatusTypeDef HAL_UART_Transmit(UART_HandleTypeDef *huart, uint8_t *pData, uint16_t Size, uint32_t Timeout)
{
  uint8_t  *pdata8bits;
  uint16_t *pdata16bits;
  uint32_t tickstart = 0U;
 
  // 、、、
    /* Process Unlocked */
    __HAL_UNLOCK(huart);
 
    while (huart->TxXferCount > 0U)
    {
      if (UART_WaitOnFlagUntilTimeout(huart, UART_FLAG_TXE, RESET, tickstart, Timeout) != HAL_OK)
      {
        return HAL_TIMEOUT;
      }
      if (pdata8bits == NULL)
      {
        huart->Instance->DR = (uint16_t)(*pdata16bits & 0x01FFU);
        pdata16bits++;
      }
      else
      {
        huart->Instance->DR = (uint8_t)(*pdata8bits & 0xFFU);
        pdata8bits++;
      }
      huart->TxXferCount--;
    }
 
 // 、、、
}

 其中的超时检测函数

UART_WaitOnFlagUntilTimeout(huart, UART_FLAG_TXE, RESET, tickstart, Timeout)

会检测发送是否超时，

/**
  * @brief  This function handles UART Communication Timeout.
  * @param  huart  Pointer to a UART_HandleTypeDef structure that contains
  *                the configuration information for the specified UART module.
  * @param  Flag specifies the UART flag to check.
  * @param  Status The new Flag status (SET or RESET).
  * @param  Tickstart Tick start value
  * @param  Timeout Timeout duration
  * @retval HAL status
  */
static HAL_StatusTypeDef UART_WaitOnFlagUntilTimeout(UART_HandleTypeDef *huart, uint32_t Flag, FlagStatus Status,
                                                     uint32_t Tickstart, uint32_t Timeout)
{
  /* Wait until flag is set */
  while ((__HAL_UART_GET_FLAG(huart, Flag) ? SET : RESET) == Status)
  {
    /* Check for the Timeout */
    if (Timeout != HAL_MAX_DELAY)
    {
      if ((Timeout == 0U) || ((HAL_GetTick() - Tickstart) > Timeout))
      {
        /* Disable TXE, RXNE, PE and ERR (Frame error, noise error, overrun error) interrupts for the interrupt process */
/* 居然把中断都给我关掉了！！！！！！！！！！！！！！！！！    */
        ATOMIC_CLEAR_BIT(huart->Instance->CR1, (USART_CR1_RXNEIE | USART_CR1_PEIE | USART_CR1_TXEIE)); 
        ATOMIC_CLEAR_BIT(huart->Instance->CR3, USART_CR3_EIE);
 
        huart->gState  = HAL_UART_STATE_READY;
        huart->RxState = HAL_UART_STATE_READY;
 
        /* Process Unlocked */
        __HAL_UNLOCK(huart);
 
        return HAL_TIMEOUT;
      }
    }
  }
  return HAL_OK;
}

超时之后居然把中断都给我关掉了。真是没有天理了。

ATOMIC_CLEAR_BIT(huart->Instance->CR1, (USART_CR1_RXNEIE | USART_CR1_PEIE | USART_CR1_TXEIE)); 

想不通为什么这么做。有知道的可以告诉一声。