然后就是代码

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extern UART_HandleTypeDef huart1;
void test_task_fun(void *arg){


    const char t_data[]={"-----------\n"};
    char tbuf[128];
    char rbuf[128];

    memset(tbuf,0,sizeof(tbuf));
    memset(rbuf,0,sizeof(rbuf));

    __HAL_UART_ENABLE_IT(&huart1,UART_IT_IDLE);
    HAL_UART_Transmit_DMA(&huart1, (uint8_t*)t_data, strlen(t_data));
	
  /* Infinite loop */
    for(;;)
    {
		if(HAL_UARTEx_ReceiveToIdle_DMA(&huart1, (uint8_t*)rbuf, sizeof(rbuf)-1)==HAL_OK)	
		{
			memcpy(tbuf,rbuf,sizeof(rbuf));
			HAL_UART_Transmit_DMA(&huart1, (uint8_t*)tbuf, strlen(tbuf));
		}	
    osDelay(1);
    }


}