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运行C5505的UART例程时,串口助手上为什么没有相应的显示

如图所示,当开始运行后程序一直在while循环里,应该是没有接收到串口助手发过去的$,而且程序中DSP会往超级终端上发送一些字符串,终端上也没有显示,如何能检测串口有没有连上呢?

不知道会是什么问题,希望有大神能解决