Neopixel SPI support with Raspberry Pi CM5

[danic85]

I want to support using neopixels via an SPI interface with the Raspberry Pi CM5. This is technically possible:

adafruit/Adafruit_CircuitPython_NeoPixel_SPI#25

The connections are simple, with a 5v and GND connection and the neopixel input connected to the MOSI pin GPIO10: https://pinout.xyz/pinout/pin19_gpio10/

Unfortunately the board.py software from Adafruit doesn't support the CM5 yet, see the issue below:
adafruit/Adafruit_Blinka#919

Once this is resolved I will test the solution on my CM5.

[danic85]

A suggested fix by the issue reporter has resolve the blocking issue.

I modified the library files located in the modular-biped directory as that is the file the virtual environment uses.
modular-biped/board.py
modular-biped/adafruit_platformdetect/*

Future upgrades of the library will likely revert these changes, but it works well enough to test this feature.

[danic85]

Successful test added to feature/cm5 branch. This could potentially be merged with main as it can be toggled in the config.