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RT685 EVK / Flexcomm I2S 24bit audio

Question asked by Petr Otoupal on Jul 15, 2020
Latest reply on Jul 16, 2020 by Petr Otoupal

Hi,

 

can someone please provide an example how to configure the WM8960 Codec / I2S on RT685 to I2S stereo 24bit mode (which has 32 clocks per sample, so in total 64 per both channels)? 

 

Technically speaking i can configure / modify the examples to set the right clocks (confirmed via scope)  and the codec to produce data in such format. If i just take the arriving data and copy them from RX to TX i can hear audio correctly, but when i actually inspect the incoming data it does not seem to be in the correct format - i assume i should always get three populated bytes and one zero byte per channel but regardless of how i setup  datalength / framelength i don't get the data i expect. The correct settings i assume here should be datalength = 32, framelength = 64.

 

Also another interesting issue is that even if i just copy the audio from rx to tx what happens sometimes is that when the code starts executing left and right channels flip. This is completely unpredicatle behavior.

 

Thanks,

 

Petr

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