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appkit keeps its data in /flash/data on an STM32, whose / only holds mounts. MP3 plays from /flash/music when the board has no card slot, and plays without its spectrum where pygraphics is missing. Weather falls back to the largest font the firmware has. Synth Station becomes a USB MIDI device on a board whose USB port can be one.
Starting the device re-enumerates the board's USB port, so a board that has machine.USBDevice but doesn't list the role keeps its port as it is.
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On an STM32 board the filesystem root only holds mounts, so appkit's data root is /flash/data there. The other changes are for a board with no SD card and no USB host port:
usb_midirole. Starting the device re-enumerates the USB port, so a board that has machine.USBDevice but doesn't list the role keeps its port as it is. The GIGA's role is in Giga: usb_device and usb_midi roles for the USB-C port pydevices#432.I tried each one on a GIGA R1 with the Display Shield at 800x480. Weather showed the forecast, MP3 played a song from /flash/music, and Windows saw the board as a MIDI port while Synth Station ran. Its instruments need ulab, which that firmware didn't have, so no sound came from it yet. The appkit services contract has a case for the new root, and tests/test_synthstation_midi.py checks the role gate.