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先将RXD和TXD连接在一起 ，然后把串口调试而定波特率，端口，发送和接收模式都要设置对。程序写进去芯片，用串口调试就可以了
谢谢
调试前，一定要先验证下usb转ttl工具是否好用。
确认好用后，再调试程序
