change layer by normal key

[RaymonSHan]

is it possible to change layer while i HOLDDOWN a normal key (such as char 'F'), then the key 'J' mean LEFT. and back to default layer when i release the normal key('F'). I know ,the difficulty is what to do when i press the 'F", is it means a normal press for f, or change layer. I think it can be solve by send key press to PC when the key is RELEASE, not when the key is PRESS. if a normal key is HOLDDOWN, it always means change layer. if it is possible, 40% keyboard is ENOUGH.

[tmk]

yes, it is possible. It is called as 'dual-role key/modifier' in keyboard community. https://en.wikipedia.org/wiki/Modifier_key#Dual-role_keys

In this firmeware the function is referred as 'tap key', btw.

[RaymonSHan]

thanks for answer. and add

ACTION_LAYER_TAP_KEY(30, KC_F)

is enough for my sample?

[tmk]

yes, i think it kind of works at least, it may depend on your usage and typing habit. if you don't like how it works it is time to implement dual-role key yourself.

[RaymonSHan]

in my image， while F down, right hand control cursor move while V down, just as numlock is ON for right hand while M down, become C-x ahead, B for buffer and F for file the question is : is it possible to define multi key press in layer , to send C-x C-F to PC ?

[tmk]

First, check wiki and tweak your keymap and try the dual-role key yourself. If you don't have keyboard yet, get it first. Without keyboard it is difficult to learn how to define keymap. https://github.com/tmk/tmk_keyboard/wiki https://github.com/tmk/tmk_keyboard/wiki/FAQ-Keymap

I think those configurations can be realized in some way, but I can't assure.

[RaymonSHan]

my main keyboard is HHKB, while second is Poker 2. the poker flash its capslock when power on too frequently, and I am waiting my GH60 now. i found this repo when choose new keyboard, and asked some newbie question. thanks for you answers, and i will define my layer.

THANKS