演示 USART1 当接收到结束符是0x0d 0x0a时，将接收到的数据传送出去V6-LED1闪烁表示正在收发数据。 -When the receiving end of the presentation USART1 operator is 0x0d 0x0a, will receive the data transmitted V6-LED1 flashes that are sending and receiving data.