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28027串口接收问题

本人在使用Control Card 开发板,现在遇上一个问题,希望大家不吝赐教。

请问为什么我的开发板使用SCI串口的例程DSP2802x Device SCI Echoback.没有办法写入数据?运行后屏幕出现串口发送的  msg = "\r\nYou will enter a character, and the DSP will echo it back! \n\0";但是无论怎么样都写不进数据。各种终端都尝试了。请问有没有什么问题?Control Card 开发板