serial keymap for lets split

keymap.c

#include "lets_split.h"
#include "action_layer.h"
#include "eeconfig.h"

extern keymap_config_t keymap_config;

// 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 _QWERTY 0
#define _LOWER 1
#define _RAISE 2
#define _ARROWS 3
#define _MOUSE 4

#define _ADJUST 16

enum custom_keycodes {
  QWERTY = SAFE_RANGE,
  LOWER,
  RAISE,
  ARROWS,
  MOUSE
};

// Fillers to make layering more clear
#define _______ KC_TRNS
#define XXXXXXX KC_NO

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

[_QWERTY] = KEYMAP( \
  KC_ESC,  KC_Q,    KC_W,    KC_E,    KC_R,    KC_T,    KC_Y,    KC_U,    KC_I,    KC_O,    KC_P,    KC_BSPC, \
  KC_TAB,  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_RSFT, \
  KC_LCTL, KC_LCTL, KC_LALT, KC_LGUI, LOWER,   KC_ENT,  KC_SPC,  RAISE,   KC_RGUI, _______, ARROWS,    BL_TOGG \
  ), 
[_LOWER] = KEYMAP( \
  KC_EXLM, KC_AT,   KC_HASH, KC_DLR,  KC_PERC, KC_CIRC, KC_AMPR, KC_ASTR, KC_LPRN, KC_RPRN, KC_UNDS, KC_PLUS, \
  KC_TILD, KC_F1,   KC_F2,   KC_F3,   KC_F4,   KC_F5,   KC_F6,   _______, _______, KC_LCBR, KC_RCBR, KC_PIPE, \
  MI_ON,   MI_OFF,  _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, \
  RESET  , BL_DEC,  BL_INC,  _______, _______, _______, _______, _______, KC_J,    KC_9,    KC_K,    _______ \
),
[_RAISE] = KEYMAP( \ 
  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_GRV,  _______, _______, KC_VOLD, KC_VOLU, _______, _______, KC_J,    KC_K,    KC_LBRC, KC_RBRC, KC_BSLS, \
  _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, \
  _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______ \
),
[_ARROWS] = KEYMAP( \ 
  _______, _______, _______, _______, _______, _______, _______, _______, KC_UP,   _______, _______, _______, \
  _______, _______, _______, _______, _______, _______, _______, KC_LEFT, KC_DOWN, KC_RGHT, _______, _______, \
  _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, \
  _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, ARROWS,  _______  \
),
[_MOUSE] = KEYMAP( \ 
  _______, _______, KC_WH_L, KC_WH_U, KC_WH_D, KC_WH_R, _______, _______, KC_MS_U, _______, _______, _______, \
  _______, _______, _______, KC_BTN1, KC_BTN2, KC_BTN3, _______, KC_MS_L, KC_MS_D, KC_MS_R, _______, _______, \
  _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, \
  _______, _______, _______, _______, _______, _______, _______, _______, KC_ACL1, KC_ACL2, _______, _______ \
)

};

void persistant_default_layer_set(uint16_t default_layer) {
  eeconfig_update_default_layer(default_layer);
  default_layer_set(default_layer);
}

bool process_record_user(uint16_t keycode, keyrecord_t *record) {
  switch (keycode) {
    case QWERTY:
      if (record->event.pressed) {
        persistant_default_layer_set(1UL<<_QWERTY);
      }
      return false;
      break;
    case LOWER:
      if (record->event.pressed) {
        layer_on(_LOWER);
        update_tri_layer(_LOWER, _RAISE, _ADJUST);
      } else {
        layer_off(_LOWER);
        update_tri_layer(_LOWER, _RAISE, _ADJUST);
      }
      return false;
      break;
    case RAISE:
      if (record->event.pressed) {
        layer_on(_RAISE);
        update_tri_layer(_LOWER, _RAISE, _ADJUST);
      } else {
        layer_off(_RAISE);
        update_tri_layer(_LOWER, _RAISE, _ADJUST);
      }
      return false;
      break;
    case ARROWS:
      if (record->event.pressed) {
        layer_on(_ARROWS);
      } else {
        layer_off(_ARROWS);
      }
      return false;
      break;
    case MOUSE:
      if (record->event.pressed) {
        layer_on(_MOUSE);
      } else {
        layer_off(_MOUSE);
      }
      return false;
      break;
  }
  return true;
}