Can't get microphone example on M5Stack ATOM echo to work

[dov]

I installed your prebuild firmware with the I2S module on a M5Stack ATOM Echo and I then tried running the examples from:

https://github.com/lemariva/uPyM5Echo

The play back example worked, though there was some annoying background noise.

But the microphone example failed on the following missing symbol to I2S(..., mode=I2S.MASTER_PDW, ...). I tried changing this to I2S.MASTER_RX, and the example now runs but the recording doesn't work.

Is this perhaps a mode that isn't supported by your I2s module?

Thanks!

[miketeachman]

Hi,
The M5Stack ATOM Echo module has a MEMS microphone that creates a PDM data stream. A PDM output is not compatible with this PR. This I2S implementation supports the Philips I2S protocol for Rx and Tx, but not a PDM data stream, so the microphone in the M5Stack module will not work with the pre-built binaries I provided. I might add PDM support after I've finished porting I2S to the PyBoards, but that will be a couple of months away.