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Fixing CircuitPython Blinka displayio to work with the MCP2221A
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README.md

Fixing CircuitPython Blinka displayio to work with the MCP2221A

Dependencies

  • Adafruit CircuitPython Blinka, configured to work with the MCP2221A breakout
  • Adafruit CircuitPython Blinka DisplayIO
  • Adafruit CircuitPython Display Text
  • Adafruit CircuitPython Bitmap Font

Issues to address

  • In Blinka, the MCP2221 pin defintion is not registered (microcontroller/__init__.py) submitted
  • In Blinka DisplayIO, attempts to concatenate list and byte array (displayio/_display.py, line 186; this seems to be fixed in the current version of the repo)
  • There seem to be some issues with using displayio: after writing the second object from a example that works fine on a microcontroller, the display flashes. I have confirmed that this occurs with DisplayIO running on Blinka with a RPi Zero W, so it's not an issue with the MCP2221 (which means I got it working!)
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