Qmk_firmware: Add support for 00, 000 keycodes

[ju0]

Some keyboards (commonly 1800 layouts) support the 00 key that types two 0's at the same time. Very rarely a keyboard will support the 000 key, which types three 0's at once. TMK used to support these, but has deprecated them. I'd like to add two keycodes:

KC_P00 for a '00'
KC_P000 for a '000' macro

[drashna]

These are actually supported scan code, no reason not to include them...
http://www.usb.org/developers/hidpage/Hut1_12v2.pdf
Page 57, 2/3 of the way down.

The only problem is that "EXTRA KEYS" (eg media keys) overlap here (at least internally).
https://github.com/qmk/qmk_firmware/blob/master/tmk_core/common/keycode.h#L430-L442

So getting this working is easy, if you don't want media keys. Getting both working is not as simple.

[fauxpark]

Not ideal, but this might work. register_code/unregister_code check whether the keycode is one of the media keys (because they need to be sent in a slightly different way), so we just bypass them entirely and do the add_key/del_key/send_keyboard_report dance ourselves.

enum my_keycodes {
  MY_00 = SAFE_RANGE,
  MY_000
};

bool process_record_user(uint16_t keycode, keyrecord_t* record) {
  switch (keycode) {
    case MY_00:
      if (record->event.pressed) {
        add_key(0xB0);
      } else {
        del_key(0xB0);
      }

      send_keyboard_report();

      return false;
    case MY_000:
      if (record->event.pressed) {
        add_key(0xB1);
      } else {
        del_key(0xB1);
      }

      send_keyboard_report();

      return false;
    default:
      return true;
  }
}

[fauxpark]

Update: the above code does work, however it doesn't appear that those keycodes actually do anything on either macOS or Windows. I could get it to print out the numpad / with 0x54 but the 00 and 000 keycodes didn't print anything.

I think you may have to use the SEND_STRING method instead - see the QMK docs.

[ju0]

Yeah, the SEND_STRING method is the way to go I think. Then you can have your media keys and sneak in the 00/000 support.

[drashna]

Ah, yeah, may need to change the keyboard layout in the OS to properly support this, then.

So .... yeah, macros it is.

And in that case, I use tap actually. It's a custom function in my user space that calls register_code and unregister_code. And just double tap KP_P0 so it uses the keypad code, and not the num row.

[drashna]

I'm closing this, as the 00 and 000 keycodes are OS dependant, and were likely removed due to a lack of OS support for them.