qmk-firmware/keyboards/handwired/tritium_numpad/keymaps/max/keymap.c

#include QMK_KEYBOARD_H

// Each layer gets a name for readability, which is then used in the keymap matrix below.
// The underscores don't mean anything - you can have a layer called STUFF or any other name.
// Layer names don't all need to be of the same length, obviously, and you can also skip them
// entirely and just use numbers.
#define _BL 0
#define _FL 1

const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
  /* Keymap _BL: (Base Layer) Default Layer
   * ,-------------------.
   * |Esc |Setp| -  | =  |
   * |----|----|----|----|
   * | F1 | F2 | F3 | F4 |
   * |----|----|----|----|
   * | 7  | 8  | 9  |  - |
   * |----|----|----|----|
   * | 4  | 5  | 6  | LF |
   * |----|----|----|----|
   * | 1  | 2  | 3  | \  |
   * |----|----|----|----|
   * |Left|Down| Up |Rght|
   * `-------------------'
   */

  [_BL] = LAYOUT_ortho_6x4(
    KC_ESC,  KC_TAB,  KC_MINS,KC_EQL,  
    KC_F1,   KC_F2,   KC_F3,  KC_F4,   
    KC_P7,   KC_P8,   KC_P9,  KC_PMNS,
    KC_P4,   KC_P5,   KC_P6,  KC_PENT, 
    KC_P1,   KC_P2,   KC_P3,  KC_BSLS, 
    KC_LEFT, KC_DOWN, KC_UP,  KC_RIGHT
  ),

  /* Keymap _FL: Function Layer
   * ,-------------------.
   * |Esc |TAB |BS  | =  |
   * |----|----|----|----|
   * | NL | /  | *  | -  |
   * |----|----|----|----|
   * | 7  | 8  | 9  |    |
   * |----|----|----|RST |
   * | 4  | 5  | 6  |    |
   * |----|----|----|----|
   * | 1  | 2  | 3  |    |
   * |----|----|----| En |
   * |   0     |./FN|    |
   * `-------------------'
   */
  [_FL] = LAYOUT_ortho_6x4(
    KC_ESC,  KC_TAB,  KC_BSPC, KC_PEQL, 
    KC_NLCK, KC_PSLS, KC_PAST, KC_PMNS, 
    KC_P7,   KC_P8,   KC_P9,   RESET,   
    KC_P4,   KC_P5,   KC_P6,   KC_PENT, 
    KC_P1,   KC_P2,   KC_P3,   KC_PENT, 
    KC_LEFT, KC_DOWN, KC_UP,   KC_RIGHT
  ),
};