To use:

- Download a toolchain (e.g. https://www.mounriver.com/download)
- `make PREFIX=..../bin/riscv-wch-elf-`

If never flashed before:
- See https://github.com/fossasia/badgemagic-firmware#installation for exact instructions.

Once loaded, holding down both buttons for a few seconds (or holding down the
lower button whilst waking up the device) should work.

Shows up as LSLED Badge Witch on bluetooth.
Both HID and CDC-ACM protocol are supported over USB, just as the badge magic firmware supports.

Code licensed under the EUPL.