添加接收DMA 和 发送DMA把发送的数据,发回来HAL_UARTEx_ReceiveToIdle_DMA(huart1,byte,150); //DMA 不定长接收数据HAL_UART_Transmit_DMA(huart1,byte,Size); //DMA串口发送void HAL_UARTEx_RxEventCallback(UART_HandleTypeDef *huart, uint16_t Size)//重写不定长DMA接收回调函数 { }B站视频:https://www.bilibili.com/video/BV1jN8P6nESX/?spm_id_from333.1387.homepage.video_card.clickvd_source5e9f4d511896df920a31ed33c6d61570