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Adding to BoonT_56 response.
Please note the I2S clock of CYW20706 can’t be set by the application directly. There is no API allowing the app to control the I2S bus. The FW configures it (as a Source or Sink) during A2DP Stream.
So if you are using A2DP profile in your application , then only you can connect the I2S codec / Mic to 20706 I2S and make it function.
Also while selecting the codec / Mic please select appropriately. The I2S is always configured for 16 bits per samples, Stereo