One of the features of TMK/QMK firmware is the KC_LOCK key, when you hold a key, and press KC_LOCK, that key become persistent even if you release it. Just like the caps lock key.
Category Archives: hardware
Packing two bytes into an integer
I’m working on building a 40% keyboard which has a 12×4 layout, and the firmware for now just need to support one key at a time…
JFT 