qmk_firmware/layouts/default/60_hhkb/default_60_hhkb/keymap.c

#include QMK_KEYBOARD_H

#define BASE 0
#define HHKB 1

const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {

    /* BASE Level: Default Layer
     |-------+---+---+---+---+---+---+---+---+---+---+-------+-----+-------+---|
     | Esc   | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 0 | -     | =   | \     | ` |
     |-------+---+---+---+---+---+---+---+---+---+---+-------+-----+-------+---|
     | Tab   | Q | W | E | R | T | Y | U | I | O | P | [     | ]   | Backs |   |
     |-------+---+---+---+---+---+---+---+---+---+---+-------+-----+-------+---|
     | Cont  | A | S | D | F | G | H | J | K | L | ; | '     | Ent |       |   |
     |-------+---+---+---+---+---+---+---+---+---+---+-------+-----+-------+---|
     | Shift | Z | X | C | V | B | N | M | , | . | / | Shift | Fn0 |       |   |
     |-------+---+---+---+---+---+---+---+---+---+---+-------+-----+-------+---|

            |------+------+-----------------------+------+------|
            | LAlt | LGUI | ******* Space ******* | RGUI | RAlt |
            |------+------+-----------------------+------+------|
    */

  [BASE] = LAYOUT_60_hhkb(  //  default layer
  KC_ESC,   KC_1,  KC_2,  KC_3,  KC_4,  KC_5,  KC_6,  KC_7,  KC_8,     KC_9,    KC_0,     KC_MINS,  KC_EQL,    KC_BSLS,  KC_GRV, \
  KC_TAB,   KC_Q,  KC_W,  KC_E,  KC_R,  KC_T,  KC_Y,  KC_U,  KC_I,     KC_O,    KC_P,     KC_LBRC,  KC_RBRC,   KC_BSPC,          \
  KC_LCTL,  KC_A,  KC_S,  KC_D,  KC_F,  KC_G,  KC_H,  KC_J,  KC_K,     KC_L,    KC_SCLN,  KC_QUOT,  KC_ENT,                      \
  KC_LSFT,  KC_Z,  KC_X,  KC_C,  KC_V,  KC_B,  KC_N,  KC_M,  KC_COMM,  KC_DOT,  KC_SLSH,  KC_RSFT,  MO(HHKB),                    \
                    KC_LALT,  KC_LGUI,  /*        */ KC_SPC,      KC_RGUI,  KC_RALT),



    /* Layer HHKB: HHKB mode (HHKB Fn)
      |------+-----+-----+-----+----+----+----+----+-----+-----+-----+-----+-------+-------+-----|
      | Pwr  | F1  | F2  | F3  | F4 | F5 | F6 | F7 | F8  | F9  | F10 | F11 | F12   | Ins   | Del |
      |------+-----+-----+-----+----+----+----+----+-----+-----+-----+-----+-------+-------+-----|
      | Caps |     |     |     |    |    |    |    | Psc | Slk | Pus | Up  |       | Backs |     |
      |------+-----+-----+-----+----+----+----+----+-----+-----+-----+-----+-------+-------+-----|
      |      | VoD | VoU | Mut |    |    | *  | /  | Hom | PgU | Lef | Rig | Enter |       |     |
      |------+-----+-----+-----+----+----+----+----+-----+-----+-----+-----+-------+-------+-----|
      |      |     |     |     |    |    | +  | -  | End | PgD | Dow |     |       |       |     |
      |------+-----+-----+-----+----+----+----+----+-----+-----+-----+-----+-------+-------+-----|

                 |------+------+----------------------+------+------+
                 | **** | **** | ******************** | **** | **** |
                 |------+------+----------------------+------+------+

     */

  [HHKB] = LAYOUT_60_hhkb(
  KC_PWR,   KC_F1,    KC_F2,    KC_F3,    KC_F4,    KC_F5,    KC_F6,    KC_F7,    KC_F8,    KC_F9,    KC_F10,   KC_F11,   KC_F12,   KC_INS,   KC_DEL, \
  KC_CAPS,  KC_TRNS,  KC_TRNS,  KC_TRNS,  KC_TRNS,  KC_TRNS,  KC_TRNS,  KC_TRNS,  KC_PSCR,  KC_SLCK,  KC_PAUS,  KC_UP,    KC_TRNS,  KC_BSPC,          \
  KC_TRNS,  KC_VOLD,  KC_VOLU,  KC_MUTE,  KC_TRNS,  KC_TRNS,  KC_PAST,  KC_PSLS,  KC_HOME,  KC_PGUP,  KC_LEFT,  KC_RGHT,  KC_PENT,                    \
  KC_TRNS,  KC_TRNS,  KC_TRNS,  KC_TRNS,  KC_TRNS,  KC_TRNS,  KC_PPLS,  KC_PMNS,  KC_END,   KC_PGDN,  KC_DOWN,  KC_TRNS,  KC_TRNS,                    \
                     KC_TRNS, KC_TRNS,           KC_TRNS,                KC_TRNS, KC_TRNS)};

// Runs just one time when the keyboard initializes.
void matrix_init_user(void) {

};

// Runs constantly in the background, in a loop.
void matrix_scan_user(void) {

};