Thanks so much for sharing! You were right, the issue had to do with the fact that the volume data is 8 MSB (instead of 16). Your fix worked, although we also have to change the code to only parse through one byte at a time (numBytesShifted = 1). Here's the volume change function with that fix ...

Hi mooalot,

Thank you for sharing your code - it's very helpful!

I implemented your volume control functions but the issue is that I don't hear any audio when I make the I2S setup as:

.communication_format = I2S_COMM_FORMAT_I2S | I2S_COMM_FORMAT_I2S_MSB,


When I set it to I2S_COMM_FORMAT_PCM ...

Hi mooalot,

Could you please share your code in write_ringbuf that fixed this? I'm having the same problem not being able to control volume. I'm using the internal DAC with .communication_format = I2S_COMM_FORMAT_PCM in the i2s_config.

Thanks,
Steven