The config directory is a ZMK configuration dir; as built,
it's got all the custom files to build a firmware for the ST Micro
P-NUCLEO-WB55 board. The files in this directory, combined with the
standard ZMK distribution, are sufficient to build a firmware for a
3-button shield (the uno_trio), which is wired as three keys in an
active-low configuration. The three keys should be wired to
"D0", "D1", and "D2" of the dev board. It's been tested over USB;
it builds with BLE support, but no testing there has been done.
To build, you need to check out the ZMK repo according to the
following: https://zmkfirmware.dev/docs/development/setup . You'll
need to make sure ZEPHYR_TOOLCHAIN_VARIANT and GNUARMEMB_TOOLCHAIN_PATH
are set in the environment; ZEPHYR_TOOLCHAIN_VARIANT should be set to
gnuarmemb, and GNUARMEMB_TOOLCHAIN_PATH should be set to the path
where the toolchain is installed.
Once ZMK is set up according to the above instructions, you'll need the
full path to the config directory in this repo:
To build, cd into the zmk/app directory, and use the west build tool:
west build -b nucleo_wb55rg -- -DSHIELD=uno_trio -DZMK_CONFIG=${ZMK_CONFIG_DIR}
If the build succeeds, and you have OpenOCD installed (you'll need to build the
latest OpenOCD from git - the 0.10.0 release doesn't have full support for the
STM32WB55), you can flash the board with west flash.