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28027与电脑SCI通信问题

烧录了例程Example_F2802xSci_Echoback进去之后

 

用串口调试软件发送字符

 

发送的时候 lauchpad角上的RX灯会闪一下

 

但是电脑并没有收到数据

 

按照例程的说法会echoback回显出来

 

是软件的原因还是其他串口连接点的原因?

 

请大牛解答

 

谢谢