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例如，wifi_audio_app例程中的AUDIO_CODEC_MIC_ONBOARD 通道声音采集，
我需要改为IN3_L，代码如下，但是声音采集不到
请问可以单独左声道采集吗？单独右声道(IN3_R)是可以的,
processing选的是2
转移到音频板块
已解决
