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tms320vc5505 ezdsp usb stick 音频测试demo

我在官网下了aic3204的例程,放到板子上跑,首先是输出功能,应该输出的是正弦波,可是听到的一直是刺,无幅度变化。。其次是回放功能,听不到我的声音,麦克风经检测好的。。请问可能是什么问题?