qmk-firmware/layouts/default/ortho_6x4/default_ortho_6x4/keymap.c

#include QMK_KEYBOARD_H

enum custom_keycodes {
    KC_P00 = SAFE_RANGE
};

const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
    /*
     * ┌───┬───┬───┬───┐
     * │Esc│Tab│MO1│Bsp│
     * ├───┼───┼───┼───┤
     * │Num│ / │ * │ - │
     * ├───┼───┼───┼───┤
     * │ 7 │ 8 │ 9 │ + │
     * ├───┼───┼───┼───┤
     * │ 4 │ 5 │ 6 │ % │
     * ├───┼───┼───┼───┤
     * │ 1 │ 2 │ 3 │ = │
     * ├───┼───┼───┼───┤
     * │ 0 │00 │ . │Ent│
     * └───┴───┴───┴───┘
     */
    [0] = LAYOUT_ortho_6x4(
        KC_ESC,  KC_TAB,  MO(1),   KC_BSPC,
        KC_NLCK, KC_PSLS, KC_PAST, KC_PMNS,
        KC_P7,   KC_P8,   KC_P9,   KC_PPLS,
        KC_P4,   KC_P5,   KC_P6,   KC_PERC,
        KC_P1,   KC_P2,   KC_P3,   KC_EQL,
        KC_P0,   KC_P00,  KC_PDOT, KC_PENT
    ),

    /*
     * ┌───┐───┬───┬───┐
     * │Rst│Tab│MO1│Bsp│
     * └───┘───┼───┼───┤
     * │Num│ / │ * │ - │
     * ┌───┬───┬───┐───┤
     * │Hom│ ↑ │PgU│ + │
     * ├───┼───┼───┤───┤
     * │ ← │   │ → │ % │
     * ├───┼───┼───┤───┤
     * │End│ ↓ │PgD│ = │
     * ├───┼───┼───┤───┤
     * │Ins│   │Del│Ent│
     * └───┴───┴───┘───┘
     */
    [1] = LAYOUT_ortho_6x4(
        RESET,   _______, _______, _______,
        _______, _______, _______, _______,
        KC_HOME, KC_UP,   KC_PGUP, _______,
        KC_LEFT, XXXXXXX, KC_RGHT, _______,
        KC_END,  KC_DOWN, KC_PGDN, _______,
        KC_INS,  XXXXXXX, KC_DEL,  _______
    )
};

bool process_record_user(uint16_t keycode, keyrecord_t *record) {
    if (record->event.pressed) {
        switch (keycode) {
            case KC_P00:
                tap_code(KC_P0);
                tap_code(KC_P0);
                return false;
        }
    }
    return true;
}