MicroPython I2S Audio with the ESP32

Does Micropython support I2S Audio on the ESP32? Almost - let's build a custom version that includes support and try it out.

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I2S is not yet officially supported, but there is a Pull Request on GitHub that adds it in.

We can build a custom version of Micropython pretty easily. We just need the ESP-IDF from here: https://github.com/espressif/esp-idf.

And then we can get a copy of Micropython from here: https://github.com/micropython/micropython

and merge in the pull request with I2S support: https://github.com/micropython/micropython/pull/7183

The full commands to set up the IDF are:

git clone -b v4.2 --recursive https://github.com/espressif/esp-idf.git cd esp-idf ./install.sh . export.sh

And then to build our custom version of Micropython:

git clone git@github.com:micropython/micropython.git git fetch origin pull/7183/head:i2s_support git merge i2s_support make -C mpy-cross cd ports/esp32 make submodules make BOARD=UM_TINYPICO

You can find a bunch of sample code here for the I2S pull request: https://github.com/miketeachman/micropython-i2s-examples

And I've pushed up my sample code here: https://github.com/atomic14/micropython-i2s-esp32-test

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