Feather M4 Express and I2S


In the list of features on the Adafruit Feather M4 Express, we see that it has I2S input and output.
In the new product announcement, Lady Ada mentions that I2S was a late addition to the board.
But, if you look at the pin-outs there is no sign of any clearly labled I2S pins.
I2C, SPI, Analogue, etc are all clearly labled but not a sign of I2S… I’m looking into this board for a possible multi-chip sound processing application and I need that I2S more than anything else.

Can anyone help me track down the elusive pins?


I wasn’t prepared for the pinout to be as elusive as you made it sound- but it’s missing from the main pinout documentation page! D’oh.

I found this:

On this page: https://learn.adafruit.com/adafruit-i2s-stereo-decoder-uda1334a/circuitpython-wiring-test

Which seems to document the Feather M4 i2s pinout.


Fan, Fan, Fantastisch!
Thanks… that’s got me pointed in the right direction.
Now if I can just find I2S input as well as output, I’ll be a very happy bunny.


You’re welcome. I’ve given Adafruit a heads up that their docs are missing i2s details.