QMK

From Wiki

Prepare dev environment under Linux

git clone https://github.com/qmk/qmk_firmware.git
cd qmk_firmware
python3 -m venv env
source env/bin/activate
python3 -m pip install wheel
python3 -m pip install qmk

qmk
qmk setup

Prepare keyboard files

Compile firmware

qmk compile -kb duckyone2sf -km default

Flash firmware on Teensy under Windows