Custom layout for building Planck keyboard QMK Firmware.
$ git clone https://github.com/qmk/qmk_firmware.git
$ cd qmk_firmware
$ git clone https://github.com/ryanmillerc/planck.git \
keyboards/planck/keymaps/ryanmillerc
$ make git-submodule
$ make planck/rev4:ryanmillerc
Attach keyboard, enter RESET mode, then run:
$ make planck/rev4:ryanmillerc:dfu