qmk-firmware/keyboard/planck/keymaps/keymap_default.c

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

#define _QW 0
#define _CM 1
#define _DV 2
#define _LW 3
#define _RS 4

const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
[_QW] = { /* 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, MO(2),   KC_SPC,  KC_SPC,  MO(1),   KC_LEFT, KC_DOWN, KC_UP,   KC_RGHT}
},
[_CM] = { /* 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, MO(2),   KC_SPC,  KC_SPC,  MO(1),   KC_LEFT, KC_DOWN, KC_UP,   KC_RGHT}
},
[_DV] = { /* 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, MO(2),   KC_SPC,  KC_SPC,  MO(1),   KC_LEFT, KC_DOWN, KC_UP,   KC_RGHT}
},
[_RS] = { /* 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,  DF(_QW), DF(_CM), DF(_DV), RESET,   KC_TRNS},
  {KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_MNXT, KC_VOLD, KC_VOLU, KC_MPLY}
},
[_LW] = { /* LOWER */
  {KC_TILD, KC_EXLM, KC_AT,   KC_HASH, KC_DLR,  KC_PERC, KC_CIRC, KC_AMPR, KC_ASTR, KC_LPRN, KC_RPRN, KC_BSPC},
  {KC_TRNS, KC_F1,   KC_F2,   KC_F3,   KC_F4,   KC_F5,   KC_F6,   KC_UNDS, KC_PLUS, KC_LCBR, KC_RCBR, KC_PIPE},
  {KC_TRNS, KC_F7,   KC_F8,   KC_F9,   KC_F10,  KC_F11,  KC_F12,  DF(_QW), DF(_CM), DF(_DV), RESET,   KC_TRNS},
  {KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_MNXT, KC_VOLD, KC_VOLU, KC_MPLY}
}
};

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

    [3] = ACTION_DEFAULT_LAYER_SET(_QW),
    [4] = ACTION_DEFAULT_LAYER_SET(_CM),
    [5] = ACTION_DEFAULT_LAYER_SET(_DV),

};

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;
};