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请您看一下
http://www.msp430launchpad.com/2012/06/using-printf.html
以及
https://gist.github.com/nicholasjconn/2896348
给出了相关的示例代码,您可以参考一下
串口读数回显的时候必须要把RXD和TXD跳线帽接在一起才可以
是的,这和开发板的硬件设计有关。回显的话,就是将串口发送过来的数据再传回去打印再串口调试助手上