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28035串口调试问题

请教一个关于28035例程里关于Sci字符回显示例的问题.

按照这个程序内容,运行后应该能在调试助手中看到“hello world! you will enter a character, and the DSP will echo it back! Enter a character"等提示,但是我运行程序之后只出现了一串00 00 00 00 00 00 00 00 00 00 00 00...

当使用串口调试助手进行发送的时候,ccs显示计数正常,即计数变量正常增加,但是不能在调试助手接收到发送的信息。

另外在打开调试助手的时候会提示:找不到C:windows\system32\msrd3x43.dll