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How to close channel of ADAU1979


I'm using ADAU1979 as ADC, it has 4 channels but I only needs 2 right now. 

I have an array to store the data from ADAU1979 and the data of 4 channels are interleaved

I want to disable other 3 channels so I all my data is come from the only one channel

I tried the API adi_adau1979_ClipChannel and adi_adau1979_MuteChannel but find they didn't work

Is there any other solution to this?

Best Regards!