HAL库串口空闲中断处理代码:

  /* UART in mode Transmitter end --------------------------------------------*/
  if(((isrflag & USART_SR_TC) != RESET) && ((crlits & USART_CR1_TCIE) != RESET))
  {
    UART_EndTransmit_IT(huart);
    return;
  }
  /* UART in mode Receiver end -----------------------------------------------*/
  if(((isrflags & USART_SR_IDLE) != RESET) && ((crlits & USART_CR1_IDLEIE) != RESET))
  {
    /* Clear the UART IDLE pending flag */
    __HAL_UART_CLEAR_IDLEFLAG(huart);
    return;
  }
}