Low-cost mechanical macro pad
- STM32F411CE only has two USB endpoints - not enough for CircuitPython's MSC & CDC in addition to HID and/or AUDIO (MIDI)
- Can remove MSC and use ampy instead
- Some LED IO shared with optional flash memory footprint
- Wide DSA profile keycaps conflict with the blackpill board edge when fully inserted in socket
Mostly solved by greenpill
rotaryionot implemented in STM portC15shown as "in use" when try to constructNeoPixel(board.C15, 9)