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关于设置DM368 McBsp 内部时钟问题



 在dvsdk4.02环境,通过设置davinci-evm.c文件中 

#define AUDIO_FORMAT (SND_SOC_DAIFMT_DSP_A| \
SND_SOC_DAIFMT_CBS_CFS | SND_SOC_DAIFMT_NB_IF)

使得McBsp 为Master模式,外接voice codec,  MCBSP_CLKX、MCBSP_CLKR、MCBSP_FSX、MCBSP_FSR都没发现时钟信号,这会是什么问题呢?