void USART3_IRQHandler(void)

{

/* USER CODE BEGIN USART3_IRQn 0 */

uint32_t tmp_flag =0;

uint32_t temp;

tmp_flag = __HAL_UART_GET_FLAG(&huart3,UART_FLAG_IDLE);

if((tmp_flag != RESET))

{

　　__HAL_UART_CLEAR_FEFLAG(&huart3);

　　temp = huart3.Instance->SR;

　　temp = huart3.Instance->DR;

　　HAL_UART_DMAStop(&huart3);

　　temp=hdma_usart3_rx.Instance->NDTR;

　　rx_len = RXSIZE - temp;

　　Rx_flag=1;

}

/* USER CODE END USART3_IRQn 0 */

　　HAL_UART_IRQHandler(&huart3);

/* USER CODE BEGIN USART3_IRQn 1 */

/* USER CODE END USART3_IRQn 1 */

}

STM32cube 串口接收任意长度数据