qmk-dactyl-manuform-a/keyboard/planck/keymaps/keymap_default.c

#include "planck.h"
#include "backlight.h"

#define QWERTY_LAYER 0
#define COLEMAK_LAYER 1
#define DVORAK_LAYER 2
#define LOWER_LAYER 3
#define RAISE_LAYER 4

const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
[QWERTY_LAYER] = { /* Qwerty */
  {KC_TAB,  KC_Q,    KC_W,    KC_E,    KC_R,    KC_T,    KC_Y,    KC_U,    KC_I,    KC_O,    KC_P,   KC_BSPC},
  {KC_ESC,  KC_A,    KC_S,    KC_D,    KC_F,    KC_G,    KC_H,    KC_J,    KC_K,    KC_L,    KC_SCLN,  KC_QUOT},
  {KC_LSFT, KC_Z,    KC_X,    KC_C,    KC_V,    KC_B,    KC_N,    KC_M,    KC_COMM, KC_DOT,  KC_SLSH, KC_ENT},
  {M(0), KC_LCTL, KC_LALT, KC_LGUI, FUNC(2),    KC_SPC,   KC_SPC,    FUNC(1),   KC_LEFT, KC_DOWN, KC_UP,  KC_RGHT}
},
[COLEMAK_LAYER] = { /* Colemak */
  {KC_TAB,  KC_Q,    KC_W,    KC_F,    KC_P,    KC_G,    KC_J,    KC_L,    KC_U,    KC_Y,    KC_SCLN, KC_BSPC},
  {KC_ESC,  KC_A,    KC_R,    KC_S,    KC_T,    KC_D,    KC_H,    KC_N,    KC_E,    KC_I,    KC_O,     KC_QUOT},
  {KC_LSFT, KC_Z,    KC_X,    KC_C,    KC_V,    KC_B,    KC_K,    KC_M,    KC_COMM, KC_DOT,  KC_SLSH, KC_ENT},
  {M(0), KC_LCTL, KC_LALT, KC_LGUI, FUNC(2),    KC_SPC,   KC_SPC,    FUNC(1),   KC_LEFT, KC_DOWN, KC_UP,  KC_RGHT}
},
[DVORAK_LAYER] = { /* Dvorak */
  {KC_TAB,  KC_QUOT, KC_COMM, KC_DOT,  KC_P,    KC_Y,    KC_F,    KC_G,    KC_C,    KC_R,    KC_L, KC_BSPC},
  {KC_ESC,  KC_A,    KC_O,    KC_E,    KC_U,    KC_I,    KC_D,    KC_H,    KC_T,    KC_N,    KC_S, KC_SLSH},
  {KC_LSFT, KC_SCLN, KC_Q,    KC_J,    KC_K,    KC_X,    KC_B,    KC_M,    KC_W,    KC_V,    KC_Z, KC_ENT},
  {M(0), KC_LCTL, KC_LALT, KC_LGUI, FUNC(2),    KC_SPC,   KC_SPC,    FUNC(1),   KC_LEFT, KC_DOWN, KC_UP,  KC_RGHT}
},
[RAISE_LAYER] = { /* RAISE */
  {KC_GRV,  KC_1,    KC_2,    KC_3,    KC_4,    KC_5,    KC_6,    KC_7,    KC_8,    KC_9,    KC_0,    KC_BSPC},
  {KC_TRNS, KC_F1,   KC_F2,   KC_F3,   KC_F4,   KC_F5,   KC_F6,   KC_MINS, KC_EQL,  KC_LBRC, KC_RBRC, KC_BSLS},
  {KC_TRNS, KC_F7,   KC_F8,   KC_F9,   KC_F10,  KC_F11,  KC_F12,  FUNC(3),   FUNC(4),   FUNC(5),   RESET, KC_TRNS},
  {KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,    KC_TRNS,   KC_TRNS,  FUNC(1),   KC_MNXT, KC_VOLD, KC_VOLU, KC_MPLY}
},
[LOWER_LAYER] = { /* LOWER */
  {S(KC_GRV), S(KC_1), S(KC_2), S(KC_3), S(KC_4), S(KC_5), S(KC_6), S(KC_7), S(KC_8), S(KC_9), S(KC_0), KC_BSPC},
  {KC_TRNS, KC_F1,   KC_F2,   KC_F3,   KC_F4,   KC_F5,   KC_F6, S(KC_MINS), S(KC_EQL), S(KC_LBRC), S(KC_RBRC), S(KC_BSLS)},
  {KC_TRNS, KC_F7,   KC_F8,   KC_F9,   KC_F10,  KC_F11,  KC_F12, FUNC(3),   FUNC(4),   FUNC(5),   RESET,  KC_TRNS},
  {KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, FUNC(2),   KC_TRNS,   KC_TRNS,   KC_TRNS, KC_MNXT, KC_VOLD, KC_VOLU, KC_MPLY}
}
};

const uint16_t PROGMEM fn_actions[] = {
    [1] = ACTION_LAYER_MOMENTARY(RAISE_LAYER),  // to RAISE
    [2] = ACTION_LAYER_MOMENTARY(LOWER_LAYER),  // to LOWER

    [3] = ACTION_DEFAULT_LAYER_SET(QWERTY_LAYER),
    [4] = ACTION_DEFAULT_LAYER_SET(COLEMAK_LAYER),
    [5] = ACTION_DEFAULT_LAYER_SET(DVORAK_LAYER),

};

const macro_t *action_get_macro(keyrecord_t *record, uint8_t id, uint8_t opt) 
{
  // MACRODOWN only works in this function
      switch(id) {
        case 0:   
        if (record->event.pressed) {
          register_code(KC_RSFT);
          backlight_step();
        } else {
          unregister_code(KC_RSFT);
        }
        break;
      } 
    return MACRO_NONE;
};