Debug程序使其运行在一处断点处，停止程序运行。发送2个或2个以上字节到串口，串口会出现溢出错误。
void HAL_UART_IRQHandler(UART_HandleTypeDef *huart) { //执行 UART_EndRxTransfer(huart); UART_EndRxTransfer(huart); ...... HAL_UART_ErrorCallback(huart); ...... } static void UART_EndRxTransfer(UART_HandleTypeDef *huart) { /* Disable RXNE, PE and ERR (Frame error, noise error, overrun error) interrupts */ CLEAR_BIT(huart->Instance->CR1, (USART_CR1_RXNEIE_RXFNEIE | USART_CR1_PEIE)); CLEAR_BIT(huart->Instance->CR3, (USART_CR3_EIE | USART_CR3_RXFTIE)); /* At end of Rx process, restore huart->RxState to Ready */ huart->RxState = HAL_UART_STATE_READY; /* Reset RxIsr function pointer */ huart->RxISR = NULL; }重写HAL_UART_ErrorCallback代码
void HAL_UART_ErrorCallback(UART_HandleTypeDef *huart) { if(huart == &huart1) { //执行HAL_UART_ErrorCallback时，还处于lock，需先unlock， //因为HAL_UART_Receive_IT执行时需判断如果是lock则直接返回BUSY __HAL_UNLOCK(huart); HAL_UART_Receive_IT(&huart1,Tx_M_Buff_Temp[0],1); } } HAL_StatusTypeDef HAL_UART_Receive_IT(UART_HandleTypeDef *huart, uint8_t *pData, uint16_t Size) { /* Check that a Rx process is not already ongoing */ if (huart->RxState == HAL_UART_STATE_READY) { if ((pData == NULL) || (Size == 0U)) { return HAL_ERROR; } //需判断如果是lock则直接返回BUSY __HAL_LOCK(huart); huart->pRxBuffPtr = pData; huart->RxXferSize = Size; huart->RxXferCount = Size; huart->RxISR = NULL; ...... }