How to use layers?

[postelrich]

I'm trouble seeing how to switch layers. I've looked at keyboard--short-names but don't see anything regarding layer switching. What I'd like to do is have page up/down toggle layers. Any direction would be great.

[benblazak]

The keyboard--short-names file lists short names for the key codes defined in the USB spec. Layers are never sent to the host, so there's no key code for them. Instead, look at lib/key-functions/public/basic.c and at how the layer push pop functions are used in the layouts in the repo.