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PCM 音频ADC,模拟有输入,示波器测量数字信号没有输出,
将模拟信号转换为I2S,工作在主模式,FSYNC,LRCK,SCKI,BCK,DOUT(这些引脚没有做上拉),用示波器测量都没有波形,只有直流电平。