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qmk_firmware/docs/keymap_examples.md

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Share your keymap idea here!

https://github.com/tmk/tmk_keyboard/issues/265

Reverse-shifted for numbers

With pressing Shift and '1' key you get 1 while with just '1' key you get !.

KBT Pure layout

Keymap code on Alps64 15fe63e8d1/keyboard/alps64/keymap_pure.c

and guide. 77ac0805ad/keyboard/alps64/Guide.md

Prevent stuck modifiers

Consider the following scenario:

  1. Layer 0 has a key defined as Shift.
  2. The same key is defined on layer 1 as the letter A.
  3. User presses Shift.
  4. User switches to layer 1 for whatever reason.
  5. User releases Shift, or rather the letter A.
  6. User switches back to layer 0.

Shift was actually never released and is still considered pressed.

If such situation bothers you add this to your config.h:

#define PREVENT_STUCK_MODIFIERS

This option uses 5 bytes of memory per every 8 keys on the keyboard rounded up (5 bits per key). For example on Planck (48 keys) it uses (48/8)*5 = 30 bytes.