qmk_firmware/quantum/quantum.c

/* Copyright 2016-2017 Jack Humbert
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "quantum.h"

#if !defined(RGBLIGHT_ENABLE) && !defined(RGB_MATRIX_ENABLE)
	#include "rgb.h"
#endif

#ifdef PROTOCOL_LUFA
#include "outputselect.h"
#endif

#ifndef BREATHING_PERIOD
#define BREATHING_PERIOD 6
#endif

#include "backlight.h"
extern backlight_config_t backlight_config;

#ifdef FAUXCLICKY_ENABLE
#include "fauxclicky.h"
#endif

#ifdef API_ENABLE
#include "api.h"
#endif

#ifdef MIDI_ENABLE
#include "process_midi.h"
#endif

#ifdef VELOCIKEY_ENABLE
#include "velocikey.h"
#endif

#ifdef HAPTIC_ENABLE
    #include "haptic.h"
#endif

#ifdef ENCODER_ENABLE
#include "encoder.h"
#endif

#ifdef AUDIO_ENABLE
  #ifndef GOODBYE_SONG
    #define GOODBYE_SONG SONG(GOODBYE_SOUND)
  #endif
  #ifndef AG_NORM_SONG
    #define AG_NORM_SONG SONG(AG_NORM_SOUND)
  #endif
  #ifndef AG_SWAP_SONG
    #define AG_SWAP_SONG SONG(AG_SWAP_SOUND)
  #endif
  float goodbye_song[][2] = GOODBYE_SONG;
  float ag_norm_song[][2] = AG_NORM_SONG;
  float ag_swap_song[][2] = AG_SWAP_SONG;
  #ifdef DEFAULT_LAYER_SONGS
    float default_layer_songs[][16][2] = DEFAULT_LAYER_SONGS;
  #endif
#endif

static void do_code16 (uint16_t code, void (*f) (uint8_t)) {
  switch (code) {
  case QK_MODS ... QK_MODS_MAX:
    break;
  default:
    return;
  }

  if (code & QK_LCTL)
    f(KC_LCTL);
  if (code & QK_LSFT)
    f(KC_LSFT);
  if (code & QK_LALT)
    f(KC_LALT);
  if (code & QK_LGUI)
    f(KC_LGUI);

  if (code < QK_RMODS_MIN) return;

  if (code & QK_RCTL)
    f(KC_RCTL);
  if (code & QK_RSFT)
    f(KC_RSFT);
  if (code & QK_RALT)
    f(KC_RALT);
  if (code & QK_RGUI)
    f(KC_RGUI);
}

static inline void qk_register_weak_mods(uint8_t kc) {
    add_weak_mods(MOD_BIT(kc));
    send_keyboard_report();
}

static inline void qk_unregister_weak_mods(uint8_t kc) {
    del_weak_mods(MOD_BIT(kc));
    send_keyboard_report();
}

static inline void qk_register_mods(uint8_t kc) {
    add_weak_mods(MOD_BIT(kc));
    send_keyboard_report();
}

static inline void qk_unregister_mods(uint8_t kc) {
    del_weak_mods(MOD_BIT(kc));
    send_keyboard_report();
}

void register_code16 (uint16_t code) {
  if (IS_MOD(code) || code == KC_NO) {
      do_code16 (code, qk_register_mods);
  } else {
      do_code16 (code, qk_register_weak_mods);
  }
  register_code (code);
}

void unregister_code16 (uint16_t code) {
  unregister_code (code);
  if (IS_MOD(code) || code == KC_NO) {
      do_code16 (code, qk_unregister_mods);
  } else {
      do_code16 (code, qk_unregister_weak_mods);
  }
}

void tap_code16(uint16_t code) {
  register_code16(code);
  #if TAP_CODE_DELAY > 0
    wait_ms(TAP_CODE_DELAY);
  #endif
  unregister_code16(code);
}

__attribute__ ((weak))
bool process_action_kb(keyrecord_t *record) {
  return true;
}

__attribute__ ((weak))
bool process_record_kb(uint16_t keycode, keyrecord_t *record) {
  return process_record_user(keycode, record);
}

__attribute__ ((weak))
bool process_record_user(uint16_t keycode, keyrecord_t *record) {
  return true;
}

void reset_keyboard(void) {
  clear_keyboard();
#if defined(MIDI_ENABLE) && defined(MIDI_BASIC)
  process_midi_all_notes_off();
#endif
#ifdef AUDIO_ENABLE
  #ifndef NO_MUSIC_MODE
    music_all_notes_off();
  #endif
  uint16_t timer_start = timer_read();
  PLAY_SONG(goodbye_song);
  shutdown_user();
  while(timer_elapsed(timer_start) < 250)
    wait_ms(1);
  stop_all_notes();
#else
  shutdown_user();
  wait_ms(250);
#endif
#ifdef HAPTIC_ENABLE
  haptic_shutdown();
#endif
// this is also done later in bootloader.c - not sure if it's neccesary here
#ifdef BOOTLOADER_CATERINA
  *(uint16_t *)0x0800 = 0x7777; // these two are a-star-specific
#endif
  bootloader_jump();
}

/* true if the last press of GRAVE_ESC was shifted (i.e. GUI or SHIFT were pressed), false otherwise.
 * Used to ensure that the correct keycode is released if the key is released.
 */
static bool grave_esc_was_shifted = false;

/* Convert record into usable keycode via the contained event. */
uint16_t get_record_keycode(keyrecord_t *record) {
  return get_event_keycode(record->event);
}


/* Convert event into usable keycode. Checks the layer cache to ensure that it
 * retains the correct keycode after a layer change, if the key is still pressed.
 */
uint16_t get_event_keycode(keyevent_t event) {

  #if !defined(NO_ACTION_LAYER) && !defined(STRICT_LAYER_RELEASE)
    /* TODO: Use store_or_get_action() or a similar function. */
    if (!disable_action_cache) {
      uint8_t layer;

      if (event.pressed) {
        layer = layer_switch_get_layer(event.key);
        update_source_layers_cache(event.key, layer);
      } else {
        layer = read_source_layers_cache(event.key);
      }
      return keymap_key_to_keycode(layer, event.key);
    } else
  #endif
    return keymap_key_to_keycode(layer_switch_get_layer(event.key), event.key);
}

/* Main keycode processing function. Hands off handling to other functions,
 * then processes internal Quantum keycodes, then processes ACTIONs.
 */
bool process_record_quantum(keyrecord_t *record) {
    uint16_t keycode = get_record_keycode(record);

    // This is how you use actions here
    // if (keycode == KC_LEAD) {
    //   action_t action;
    //   action.code = ACTION_DEFAULT_LAYER_SET(0);
    //   process_action(record, action);
    //   return false;
    // }

  #ifdef VELOCIKEY_ENABLE
    if (velocikey_enabled() && record->event.pressed) { velocikey_accelerate(); }
  #endif

  #ifdef TAP_DANCE_ENABLE
    preprocess_tap_dance(keycode, record);
  #endif

  #if defined(OLED_DRIVER_ENABLE) && !defined(OLED_DISABLE_TIMEOUT)
    // Wake up oled if user is using those fabulous keys!
    if (record->event.pressed)
      oled_on();
  #endif

  if (!(
  #if defined(KEY_LOCK_ENABLE)
    // Must run first to be able to mask key_up events.
    process_key_lock(&keycode, record) &&
  #endif
  #if defined(AUDIO_ENABLE) && defined(AUDIO_CLICKY)
    process_clicky(keycode, record) &&
  #endif //AUDIO_CLICKY
  #ifdef HAPTIC_ENABLE
    process_haptic(keycode, record) &&
  #endif //HAPTIC_ENABLE
  #if defined(RGB_MATRIX_ENABLE) && defined(RGB_MATRIX_KEYREACTIVE_ENABLED)
    process_rgb_matrix(keycode, record) &&
  #endif
    process_record_kb(keycode, record) &&
  #if defined(MIDI_ENABLE) && defined(MIDI_ADVANCED)
    process_midi(keycode, record) &&
  #endif
  #ifdef AUDIO_ENABLE
    process_audio(keycode, record) &&
  #endif
  #ifdef STENO_ENABLE
    process_steno(keycode, record) &&
  #endif
  #if (defined(AUDIO_ENABLE) || (defined(MIDI_ENABLE) && defined(MIDI_BASIC))) && !defined(NO_MUSIC_MODE)
    process_music(keycode, record) &&
  #endif
  #ifdef TAP_DANCE_ENABLE
    process_tap_dance(keycode, record) &&
  #endif
  #if defined(UNICODE_ENABLE) || defined(UNICODEMAP_ENABLE) || defined(UCIS_ENABLE)
    process_unicode_common(keycode, record) &&
  #endif
  #ifdef LEADER_ENABLE
    process_leader(keycode, record) &&
  #endif
  #ifdef COMBO_ENABLE
    process_combo(keycode, record) &&
  #endif
  #ifdef PRINTING_ENABLE
    process_printer(keycode, record) &&
  #endif
  #ifdef AUTO_SHIFT_ENABLE
    process_auto_shift(keycode, record) &&
  #endif
  #ifdef TERMINAL_ENABLE
    process_terminal(keycode, record) &&
  #endif
  #ifdef SPACE_CADET_ENABLE
    process_space_cadet(keycode, record) &&
  #endif
      true)) {
    return false;
  }

  // Shift / paren setup

  switch(keycode) {
    case RESET:
      if (record->event.pressed) {
        reset_keyboard();
      }
    return false;
    case DEBUG:
      if (record->event.pressed) {
          debug_enable = true;
          print("DEBUG: enabled.\n");
      }
    return false;
    case EEPROM_RESET:
      if (record->event.pressed) {
          eeconfig_init();
      }
    return false;
  #ifdef FAUXCLICKY_ENABLE
  case FC_TOG:
    if (record->event.pressed) {
      FAUXCLICKY_TOGGLE;
    }
    return false;
  case FC_ON:
    if (record->event.pressed) {
      FAUXCLICKY_ON;
    }
    return false;
  case FC_OFF:
    if (record->event.pressed) {
      FAUXCLICKY_OFF;
    }
    return false;
  #endif
  #if defined(RGBLIGHT_ENABLE) || defined(RGB_MATRIX_ENABLE)
  case RGB_TOG:
    // Split keyboards need to trigger on key-up for edge-case issue
    #ifndef SPLIT_KEYBOARD
    if (record->event.pressed) {
    #else
    if (!record->event.pressed) {
    #endif
      rgblight_toggle();
    }
    return false;
  case RGB_MODE_FORWARD:
    if (record->event.pressed) {
      uint8_t shifted = get_mods() & (MOD_BIT(KC_LSHIFT)|MOD_BIT(KC_RSHIFT));
      if(shifted) {
        rgblight_step_reverse();
      }
      else {
        rgblight_step();
      }
    }
    return false;
  case RGB_MODE_REVERSE:
    if (record->event.pressed) {
      uint8_t shifted = get_mods() & (MOD_BIT(KC_LSHIFT)|MOD_BIT(KC_RSHIFT));
      if(shifted) {
        rgblight_step();
      }
      else {
        rgblight_step_reverse();
      }
    }
    return false;
  case RGB_HUI:
    // Split keyboards need to trigger on key-up for edge-case issue
    #ifndef SPLIT_KEYBOARD
    if (record->event.pressed) {
    #else
    if (!record->event.pressed) {
    #endif
      rgblight_increase_hue();
    }
    return false;
  case RGB_HUD:
    // Split keyboards need to trigger on key-up for edge-case issue
    #ifndef SPLIT_KEYBOARD
    if (record->event.pressed) {
    #else
    if (!record->event.pressed) {
    #endif
      rgblight_decrease_hue();
    }
    return false;
  case RGB_SAI:
    // Split keyboards need to trigger on key-up for edge-case issue
    #ifndef SPLIT_KEYBOARD
    if (record->event.pressed) {
    #else
    if (!record->event.pressed) {
    #endif
      rgblight_increase_sat();
    }
    return false;
  case RGB_SAD:
    // Split keyboards need to trigger on key-up for edge-case issue
    #ifndef SPLIT_KEYBOARD
    if (record->event.pressed) {
    #else
    if (!record->event.pressed) {
    #endif
      rgblight_decrease_sat();
    }
    return false;
  case RGB_VAI:
    // Split keyboards need to trigger on key-up for edge-case issue
    #ifndef SPLIT_KEYBOARD
    if (record->event.pressed) {
    #else
    if (!record->event.pressed) {
    #endif
      rgblight_increase_val();
    }
    return false;
  case RGB_VAD:
    // Split keyboards need to trigger on key-up for edge-case issue
    #ifndef SPLIT_KEYBOARD
    if (record->event.pressed) {
    #else
    if (!record->event.pressed) {
    #endif
      rgblight_decrease_val();
    }
    return false;
  case RGB_SPI:
    if (record->event.pressed) {
      rgblight_increase_speed();
    }
    return false;
  case RGB_SPD:
    if (record->event.pressed) {
      rgblight_decrease_speed();
    }
    return false;
  case RGB_MODE_PLAIN:
    if (record->event.pressed) {
      rgblight_mode(RGBLIGHT_MODE_STATIC_LIGHT);
    }
    return false;
  case RGB_MODE_BREATHE:
  #ifdef RGBLIGHT_EFFECT_BREATHING
    if (record->event.pressed) {
      if ((RGBLIGHT_MODE_BREATHING <= rgblight_get_mode()) &&
          (rgblight_get_mode() < RGBLIGHT_MODE_BREATHING_end)) {
        rgblight_step();
      } else {
        rgblight_mode(RGBLIGHT_MODE_BREATHING);
      }
    }
  #endif
    return false;
  case RGB_MODE_RAINBOW:
  #ifdef RGBLIGHT_EFFECT_RAINBOW_MOOD
    if (record->event.pressed) {
      if ((RGBLIGHT_MODE_RAINBOW_MOOD <= rgblight_get_mode()) &&
          (rgblight_get_mode() < RGBLIGHT_MODE_RAINBOW_MOOD_end)) {
        rgblight_step();
      } else {
        rgblight_mode(RGBLIGHT_MODE_RAINBOW_MOOD);
      }
    }
  #endif
    return false;
  case RGB_MODE_SWIRL:
  #ifdef RGBLIGHT_EFFECT_RAINBOW_SWIRL
    if (record->event.pressed) {
      if ((RGBLIGHT_MODE_RAINBOW_SWIRL <= rgblight_get_mode()) &&
          (rgblight_get_mode() < RGBLIGHT_MODE_RAINBOW_SWIRL_end)) {
        rgblight_step();
      } else {
        rgblight_mode(RGBLIGHT_MODE_RAINBOW_SWIRL);
      }
    }
  #endif
    return false;
  case RGB_MODE_SNAKE:
  #ifdef RGBLIGHT_EFFECT_SNAKE
    if (record->event.pressed) {
      if ((RGBLIGHT_MODE_SNAKE <= rgblight_get_mode()) &&
          (rgblight_get_mode() < RGBLIGHT_MODE_SNAKE_end)) {
        rgblight_step();
      } else {
        rgblight_mode(RGBLIGHT_MODE_SNAKE);
      }
    }
  #endif
    return false;
  case RGB_MODE_KNIGHT:
  #ifdef RGBLIGHT_EFFECT_KNIGHT
    if (record->event.pressed) {
      if ((RGBLIGHT_MODE_KNIGHT <= rgblight_get_mode()) &&
          (rgblight_get_mode() < RGBLIGHT_MODE_KNIGHT_end)) {
        rgblight_step();
      } else {
        rgblight_mode(RGBLIGHT_MODE_KNIGHT);
      }
    }
  #endif
    return false;
  case RGB_MODE_XMAS:
  #ifdef RGBLIGHT_EFFECT_CHRISTMAS
    if (record->event.pressed) {
      rgblight_mode(RGBLIGHT_MODE_CHRISTMAS);
    }
  #endif
    return false;
  case RGB_MODE_GRADIENT:
  #ifdef RGBLIGHT_EFFECT_STATIC_GRADIENT
    if (record->event.pressed) {
      if ((RGBLIGHT_MODE_STATIC_GRADIENT <= rgblight_get_mode()) &&
          (rgblight_get_mode() < RGBLIGHT_MODE_STATIC_GRADIENT_end)) {
        rgblight_step();
      } else {
        rgblight_mode(RGBLIGHT_MODE_STATIC_GRADIENT);
      }
    }
  #endif
    return false;
  case RGB_MODE_RGBTEST:
  #ifdef RGBLIGHT_EFFECT_RGB_TEST
    if (record->event.pressed) {
      rgblight_mode(RGBLIGHT_MODE_RGB_TEST);
    }
  #endif
    return false;
  #endif // defined(RGBLIGHT_ENABLE) || defined(RGB_MATRIX_ENABLE)
  #ifdef VELOCIKEY_ENABLE
    case VLK_TOG:
      if (record->event.pressed) {
        velocikey_toggle();
      }
      return false;
  #endif
  #ifdef PROTOCOL_LUFA
    case OUT_AUTO:
      if (record->event.pressed) {
        set_output(OUTPUT_AUTO);
      }
      return false;
    case OUT_USB:
      if (record->event.pressed) {
        set_output(OUTPUT_USB);
      }
      return false;
    #ifdef BLUETOOTH_ENABLE
    case OUT_BT:
      if (record->event.pressed) {
        set_output(OUTPUT_BLUETOOTH);
      }
      return false;
    #endif
    #endif
    case MAGIC_SWAP_CONTROL_CAPSLOCK ... MAGIC_TOGGLE_NKRO:
      if (record->event.pressed) {
        // MAGIC actions (BOOTMAGIC without the boot)
        if (!eeconfig_is_enabled()) {
            eeconfig_init();
        }
        /* keymap config */
        keymap_config.raw = eeconfig_read_keymap();
        switch (keycode)
        {
          case MAGIC_SWAP_CONTROL_CAPSLOCK:
            keymap_config.swap_control_capslock = true;
            break;
          case MAGIC_CAPSLOCK_TO_CONTROL:
            keymap_config.capslock_to_control = true;
            break;
          case MAGIC_SWAP_LALT_LGUI:
            keymap_config.swap_lalt_lgui = true;
            break;
          case MAGIC_SWAP_RALT_RGUI:
            keymap_config.swap_ralt_rgui = true;
            break;
          case MAGIC_NO_GUI:
            keymap_config.no_gui = true;
            break;
          case MAGIC_SWAP_GRAVE_ESC:
            keymap_config.swap_grave_esc = true;
            break;
          case MAGIC_SWAP_BACKSLASH_BACKSPACE:
            keymap_config.swap_backslash_backspace = true;
            break;
          case MAGIC_HOST_NKRO:
            keymap_config.nkro = true;
            break;
          case MAGIC_SWAP_ALT_GUI:
            keymap_config.swap_lalt_lgui = true;
            keymap_config.swap_ralt_rgui = true;
            #ifdef AUDIO_ENABLE
              PLAY_SONG(ag_swap_song);
            #endif
            break;
          case MAGIC_UNSWAP_CONTROL_CAPSLOCK:
            keymap_config.swap_control_capslock = false;
            break;
          case MAGIC_UNCAPSLOCK_TO_CONTROL:
            keymap_config.capslock_to_control = false;
            break;
          case MAGIC_UNSWAP_LALT_LGUI:
            keymap_config.swap_lalt_lgui = false;
            break;
          case MAGIC_UNSWAP_RALT_RGUI:
            keymap_config.swap_ralt_rgui = false;
            break;
          case MAGIC_UNNO_GUI:
            keymap_config.no_gui = false;
            break;
          case MAGIC_UNSWAP_GRAVE_ESC:
            keymap_config.swap_grave_esc = false;
            break;
          case MAGIC_UNSWAP_BACKSLASH_BACKSPACE:
            keymap_config.swap_backslash_backspace = false;
            break;
          case MAGIC_UNHOST_NKRO:
            keymap_config.nkro = false;
            break;
          case MAGIC_UNSWAP_ALT_GUI:
            keymap_config.swap_lalt_lgui = false;
            keymap_config.swap_ralt_rgui = false;
            #ifdef AUDIO_ENABLE
              PLAY_SONG(ag_norm_song);
            #endif
            break;
          case MAGIC_TOGGLE_ALT_GUI:
            keymap_config.swap_lalt_lgui = !keymap_config.swap_lalt_lgui;
            keymap_config.swap_ralt_rgui = !keymap_config.swap_ralt_rgui;
            #ifdef AUDIO_ENABLE
              if (keymap_config.swap_ralt_rgui) {
                PLAY_SONG(ag_swap_song);
              } else {
                PLAY_SONG(ag_norm_song);
              }
            #endif
            break;
          case MAGIC_TOGGLE_NKRO:
            keymap_config.nkro = !keymap_config.nkro;
            break;
          default:
            break;
        }
        eeconfig_update_keymap(keymap_config.raw);
        clear_keyboard(); // clear to prevent stuck keys

        return false;
      }
      break;

    case GRAVE_ESC: {
      uint8_t shifted = get_mods() & ((MOD_BIT(KC_LSHIFT)|MOD_BIT(KC_RSHIFT)
                                      |MOD_BIT(KC_LGUI)|MOD_BIT(KC_RGUI)));

#ifdef GRAVE_ESC_ALT_OVERRIDE
      // if ALT is pressed, ESC is always sent
      // this is handy for the cmd+opt+esc shortcut on macOS, among other things.
      if (get_mods() & (MOD_BIT(KC_LALT) | MOD_BIT(KC_RALT))) {
        shifted = 0;
      }
#endif

#ifdef GRAVE_ESC_CTRL_OVERRIDE
      // if CTRL is pressed, ESC is always sent
      // this is handy for the ctrl+shift+esc shortcut on windows, among other things.
      if (get_mods() & (MOD_BIT(KC_LCTL) | MOD_BIT(KC_RCTL))) {
        shifted = 0;
      }
#endif

#ifdef GRAVE_ESC_GUI_OVERRIDE
      // if GUI is pressed, ESC is always sent
      if (get_mods() & (MOD_BIT(KC_LGUI) | MOD_BIT(KC_RGUI))) {
        shifted = 0;
      }
#endif

#ifdef GRAVE_ESC_SHIFT_OVERRIDE
      // if SHIFT is pressed, ESC is always sent
      if (get_mods() & (MOD_BIT(KC_LSHIFT) | MOD_BIT(KC_RSHIFT))) {
        shifted = 0;
      }
#endif

      if (record->event.pressed) {
        grave_esc_was_shifted = shifted;
        add_key(shifted ? KC_GRAVE : KC_ESCAPE);
      }
      else {
        del_key(grave_esc_was_shifted ? KC_GRAVE : KC_ESCAPE);
      }

      send_keyboard_report();
      return false;
    }

#if defined(BACKLIGHT_ENABLE) && defined(BACKLIGHT_BREATHING)
    case BL_BRTG: {
      if (record->event.pressed)
        breathing_toggle();
      return false;
    }
#endif
  }

  return process_action_kb(record);
}

__attribute__ ((weak))
const bool ascii_to_shift_lut[0x80] PROGMEM = {
    0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0,
    0, 1, 1, 1, 1, 1, 1, 0,
    1, 1, 1, 1, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 1, 0, 1, 0, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 0, 0, 0, 1, 1,
    0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 1, 1, 1, 1, 0
};

__attribute__ ((weak))
const bool ascii_to_altgr_lut[0x80] PROGMEM = {
    0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0
};

__attribute__ ((weak))
const uint8_t ascii_to_keycode_lut[0x80] PROGMEM = {
    0, 0, 0, 0, 0, 0, 0, 0,
    KC_BSPC, KC_TAB, KC_ENT, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, KC_ESC, 0, 0, 0, 0,
    KC_SPC, KC_1, KC_QUOT, KC_3, KC_4, KC_5, KC_7, KC_QUOT,
    KC_9, KC_0, KC_8, KC_EQL, KC_COMM, KC_MINS, KC_DOT, KC_SLSH,
    KC_0, KC_1, KC_2, KC_3, KC_4, KC_5, KC_6, KC_7,
    KC_8, KC_9, KC_SCLN, KC_SCLN, KC_COMM, KC_EQL, KC_DOT, KC_SLSH,
    KC_2, KC_A, KC_B, KC_C, KC_D, KC_E, KC_F, KC_G,
    KC_H, KC_I, KC_J, KC_K, KC_L, KC_M, KC_N, KC_O,
    KC_P, KC_Q, KC_R, KC_S, KC_T, KC_U, KC_V, KC_W,
    KC_X, KC_Y, KC_Z, KC_LBRC, KC_BSLS, KC_RBRC, KC_6, KC_MINS,
    KC_GRV, KC_A, KC_B, KC_C, KC_D, KC_E, KC_F, KC_G,
    KC_H, KC_I, KC_J, KC_K, KC_L, KC_M, KC_N, KC_O,
    KC_P, KC_Q, KC_R, KC_S, KC_T, KC_U, KC_V, KC_W,
    KC_X, KC_Y, KC_Z, KC_LBRC, KC_BSLS, KC_RBRC, KC_GRV, KC_DEL
};

void send_string(const char *str) {
  send_string_with_delay(str, 0);
}

void send_string_P(const char *str) {
  send_string_with_delay_P(str, 0);
}

void send_string_with_delay(const char *str, uint8_t interval) {
    while (1) {
        char ascii_code = *str;
        if (!ascii_code) break;
        if (ascii_code == SS_TAP_CODE) {
          // tap
          uint8_t keycode = *(++str);
          register_code(keycode);
          unregister_code(keycode);
        } else if (ascii_code == SS_DOWN_CODE) {
          // down
          uint8_t keycode = *(++str);
          register_code(keycode);
        } else if (ascii_code == SS_UP_CODE) {
          // up
          uint8_t keycode = *(++str);
          unregister_code(keycode);
        } else {
          send_char(ascii_code);
        }
        ++str;
        // interval
        { uint8_t ms = interval; while (ms--) wait_ms(1); }
    }
}

void send_string_with_delay_P(const char *str, uint8_t interval) {
    while (1) {
        char ascii_code = pgm_read_byte(str);
        if (!ascii_code) break;
        if (ascii_code == SS_TAP_CODE) {
          // tap
          uint8_t keycode = pgm_read_byte(++str);
          register_code(keycode);
          unregister_code(keycode);
        } else if (ascii_code == SS_DOWN_CODE) {
          // down
          uint8_t keycode = pgm_read_byte(++str);
          register_code(keycode);
        } else if (ascii_code == SS_UP_CODE) {
          // up
          uint8_t keycode = pgm_read_byte(++str);
          unregister_code(keycode);
        } else {
          send_char(ascii_code);
        }
        ++str;
        // interval
        { uint8_t ms = interval; while (ms--) wait_ms(1); }
    }
}

void send_char(char ascii_code) {
  uint8_t keycode = pgm_read_byte(&ascii_to_keycode_lut[(uint8_t)ascii_code]);
  bool is_shifted = pgm_read_byte(&ascii_to_shift_lut[(uint8_t)ascii_code]);
  bool is_altgred = pgm_read_byte(&ascii_to_altgr_lut[(uint8_t)ascii_code]);

  if (is_shifted) {
    register_code(KC_LSFT);
  }
  if (is_altgred) {
    register_code(KC_RALT);
  }
  tap_code(keycode);
  if (is_altgred) {
    unregister_code(KC_RALT);
  }
  if (is_shifted) {
    unregister_code(KC_LSFT);
  }
}

void set_single_persistent_default_layer(uint8_t default_layer) {
  #if defined(AUDIO_ENABLE) && defined(DEFAULT_LAYER_SONGS)
    PLAY_SONG(default_layer_songs[default_layer]);
  #endif
  eeconfig_update_default_layer(1U<<default_layer);
  default_layer_set(1U<<default_layer);
}

uint32_t update_tri_layer_state(uint32_t state, uint8_t layer1, uint8_t layer2, uint8_t layer3) {
  uint32_t mask12 = (1UL << layer1) | (1UL << layer2);
  uint32_t mask3 = 1UL << layer3;
  return (state & mask12) == mask12 ? (state | mask3) : (state & ~mask3);
}

void update_tri_layer(uint8_t layer1, uint8_t layer2, uint8_t layer3) {
  layer_state_set(update_tri_layer_state(layer_state, layer1, layer2, layer3));
}

void tap_random_base64(void) {
  #if defined(__AVR_ATmega32U4__)
    uint8_t key = (TCNT0 + TCNT1 + TCNT3 + TCNT4) % 64;
  #else
    uint8_t key = rand() % 64;
  #endif
  switch (key) {
    case 0 ... 25:
      register_code(KC_LSFT);
      register_code(key + KC_A);
      unregister_code(key + KC_A);
      unregister_code(KC_LSFT);
      break;
    case 26 ... 51:
      register_code(key - 26 + KC_A);
      unregister_code(key - 26 + KC_A);
      break;
    case 52:
      register_code(KC_0);
      unregister_code(KC_0);
      break;
    case 53 ... 61:
      register_code(key - 53 + KC_1);
      unregister_code(key - 53 + KC_1);
      break;
    case 62:
      register_code(KC_LSFT);
      register_code(KC_EQL);
      unregister_code(KC_EQL);
      unregister_code(KC_LSFT);
      break;
    case 63:
      register_code(KC_SLSH);
      unregister_code(KC_SLSH);
      break;
  }
}

__attribute__((weak))
void bootmagic_lite(void) {
  // The lite version of TMK's bootmagic based on Wilba.
  // 100% less potential for accidentally making the
  // keyboard do stupid things.

  // We need multiple scans because debouncing can't be turned off.
  matrix_scan();
  #if defined(DEBOUNCING_DELAY) && DEBOUNCING_DELAY > 0
    wait_ms(DEBOUNCING_DELAY * 2);
  #elif defined(DEBOUNCE) && DEBOUNCE > 0
    wait_ms(DEBOUNCE * 2);
  #else
    wait_ms(30);
  #endif
  matrix_scan();

  // If the Esc and space bar are held down on power up,
  // reset the EEPROM valid state and jump to bootloader.
  // Assumes Esc is at [0,0].
  // This isn't very generalized, but we need something that doesn't
  // rely on user's keymaps in firmware or EEPROM.
  if (matrix_get_row(BOOTMAGIC_LITE_ROW) & (1 << BOOTMAGIC_LITE_COLUMN)) {
    eeconfig_disable();
    // Jump to bootloader.
    bootloader_jump();
  }
}

void matrix_init_quantum() {
  #ifdef BOOTMAGIC_LITE
    bootmagic_lite();
  #endif
  if (!eeconfig_is_enabled()) {
    eeconfig_init();
  }
  #ifdef BACKLIGHT_ENABLE
    #ifdef LED_MATRIX_ENABLE
        led_matrix_init();
    #else
        backlight_init_ports();
    #endif
  #endif
  #ifdef AUDIO_ENABLE
    audio_init();
  #endif
  #ifdef RGB_MATRIX_ENABLE
    rgb_matrix_init();
  #endif
  #ifdef ENCODER_ENABLE
    encoder_init();
  #endif
  #if defined(UNICODE_ENABLE) || defined(UNICODEMAP_ENABLE) || defined(UCIS_ENABLE)
    unicode_input_mode_init();
  #endif
  #ifdef HAPTIC_ENABLE
    haptic_init();
  #endif
  #ifdef OUTPUT_AUTO_ENABLE
    set_output(OUTPUT_AUTO);
  #endif
  #ifdef OLED_DRIVER_ENABLE
    oled_init(OLED_ROTATION_0);
  #endif
  matrix_init_kb();
}

void matrix_scan_quantum() {
  #if defined(AUDIO_ENABLE) && !defined(NO_MUSIC_MODE)
    matrix_scan_music();
  #endif

  #ifdef TAP_DANCE_ENABLE
    matrix_scan_tap_dance();
  #endif

  #ifdef COMBO_ENABLE
    matrix_scan_combo();
  #endif

  #if defined(BACKLIGHT_ENABLE)
    #if defined(LED_MATRIX_ENABLE)
        led_matrix_task();
    #elif defined(BACKLIGHT_PIN)
        backlight_task();
    #endif
  #endif

  #ifdef RGB_MATRIX_ENABLE
    rgb_matrix_task();
  #endif

  #ifdef ENCODER_ENABLE
    encoder_read();
  #endif

  #ifdef HAPTIC_ENABLE
    haptic_task();
  #endif

  #ifdef OLED_DRIVER_ENABLE
    oled_task();
  #endif

  matrix_scan_kb();
}
#if defined(BACKLIGHT_ENABLE) && (defined(BACKLIGHT_PIN) || defined(BACKLIGHT_PINS))

// The logic is a bit complex, we support 3 setups:
// 1. hardware PWM when backlight is wired to a PWM pin
// depending on this pin, we use a different output compare unit
// 2. software PWM with hardware timers, but the used timer depends
// on the audio setup (audio wins other backlight)
// 3. full software PWM

#if BACKLIGHT_PIN == B7
#  define HARDWARE_PWM
#  define TCCRxA TCCR1A
#  define TCCRxB TCCR1B
#  define COMxx1 COM1C1
#  define OCRxx  OCR1C
#  define ICRx   ICR1
#elif BACKLIGHT_PIN == B6
#  define HARDWARE_PWM
#  define TCCRxA TCCR1A
#  define TCCRxB TCCR1B
#  define COMxx1 COM1B1
#  define OCRxx  OCR1B
#  define ICRx   ICR1
#elif BACKLIGHT_PIN == B5
#  define HARDWARE_PWM
#  define TCCRxA TCCR1A
#  define TCCRxB TCCR1B
#  define COMxx1 COM1A1
#  define OCRxx  OCR1A
#  define ICRx   ICR1
#elif BACKLIGHT_PIN == C6
#  define HARDWARE_PWM
#  define TCCRxA TCCR3A
#  define TCCRxB TCCR3B
#  define COMxx1 COM1A1
#  define OCRxx  OCR3A
#  define ICRx   ICR3
#elif defined(__AVR_ATmega32A__) && BACKLIGHT_PIN == D4
#  define TCCRxA TCCR1A
#  define TCCRxB TCCR1B
#  define COMxx1 COM1B1
#  define OCRxx  OCR1B
#  define ICRx   ICR1
#  define TIMSK1 TIMSK
#else
#  if !defined(BACKLIGHT_CUSTOM_DRIVER)
#    if !defined(B5_AUDIO) && !defined(B6_AUDIO) && !defined(B7_AUDIO)
     // timer 1 is not used by audio , backlight can use it
#pragma message "Using hardware timer 1 with software PWM"
#      define HARDWARE_PWM
#      define BACKLIGHT_PWM_TIMER
#      define TCCRxA TCCR1A
#      define TCCRxB TCCR1B
#      define OCRxx  OCR1A
#      define OCRxAH OCR1AH
#      define OCRxAL OCR1AL
#      define TIMERx_COMPA_vect TIMER1_COMPA_vect
#      define TIMERx_OVF_vect TIMER1_OVF_vect
#      define OCIExA OCIE1A
#      define TOIEx  TOIE1
#      define ICRx   ICR1
#      ifndef TIMSK
#        define TIMSK TIMSK1
#      endif
#    elif !defined(C6_AUDIO) && !defined(C5_AUDIO) && !defined(C4_AUDIO)
#pragma message "Using hardware timer 3 with software PWM"
// timer 3 is not used by audio, backlight can use it
#      define HARDWARE_PWM
#      define BACKLIGHT_PWM_TIMER
#      define TCCRxA TCCR3A
#      define TCCRxB TCCR3B
#      define OCRxx OCR3A
#      define OCRxAH OCR3AH
#      define OCRxAL OCR3AL
#      define TIMERx_COMPA_vect TIMER3_COMPA_vect
#      define TIMERx_OVF_vect TIMER3_OVF_vect
#      define OCIExA OCIE3A
#      define TOIEx  TOIE3
#      define ICRx   ICR1
#      ifndef TIMSK
#        define TIMSK TIMSK3
#      endif
#    else
#pragma message "Audio in use - using pure software PWM"
#define NO_HARDWARE_PWM
#    endif
#  else
#pragma message "Custom driver defined - using pure software PWM"
#define NO_HARDWARE_PWM
#  endif
#endif

#ifndef BACKLIGHT_ON_STATE
#define BACKLIGHT_ON_STATE 0
#endif

void backlight_on(uint8_t backlight_pin) {
#if BACKLIGHT_ON_STATE == 0
  writePinLow(backlight_pin);
#else
  writePinHigh(backlight_pin);
#endif
}

void backlight_off(uint8_t backlight_pin) {
#if BACKLIGHT_ON_STATE == 0
  writePinHigh(backlight_pin);
#else
  writePinLow(backlight_pin);
#endif
}


#if defined(NO_HARDWARE_PWM) || defined(BACKLIGHT_PWM_TIMER)  // pwm through software

// we support multiple backlight pins
#ifndef BACKLIGHT_LED_COUNT
#define BACKLIGHT_LED_COUNT 1
#endif

#if BACKLIGHT_LED_COUNT == 1
#define BACKLIGHT_PIN_INIT { BACKLIGHT_PIN }
#else
#define BACKLIGHT_PIN_INIT BACKLIGHT_PINS
#endif

#define FOR_EACH_LED(x)                             \
  for (uint8_t i = 0; i < BACKLIGHT_LED_COUNT; i++) \
  {                                                 \
    uint8_t backlight_pin = backlight_pins[i];      \
    { \
      x                         \
    }                                             \
  }

static const uint8_t backlight_pins[BACKLIGHT_LED_COUNT] = BACKLIGHT_PIN_INIT;

#else // full hardware PWM

// we support only one backlight pin
static const uint8_t backlight_pin = BACKLIGHT_PIN;
#define FOR_EACH_LED(x) x

#endif

#ifdef NO_HARDWARE_PWM
__attribute__((weak))
void backlight_init_ports(void)
{
  // Setup backlight pin as output and output to on state.
  FOR_EACH_LED(
    setPinOutput(backlight_pin);
    backlight_on(backlight_pin);
  )
}

__attribute__ ((weak))
void backlight_set(uint8_t level) {}

uint8_t backlight_tick = 0;

#ifndef BACKLIGHT_CUSTOM_DRIVER
void backlight_task(void) {
  if ((0xFFFF >> ((BACKLIGHT_LEVELS - get_backlight_level()) * ((BACKLIGHT_LEVELS + 1) / 2))) & (1 << backlight_tick)) {
    FOR_EACH_LED(
      backlight_on(backlight_pin);
    )
  }
  else {
    FOR_EACH_LED(
      backlight_off(backlight_pin);
    )
  }
  backlight_tick = (backlight_tick + 1) % 16;
}
#endif

#ifdef BACKLIGHT_BREATHING
  #ifndef BACKLIGHT_CUSTOM_DRIVER
  #error "Backlight breathing only available with hardware PWM. Please disable."
  #endif
#endif

#else // hardware pwm through timer

#ifdef BACKLIGHT_PWM_TIMER

// The idea of software PWM assisted by hardware timers is the following
// we use the hardware timer in fast PWM mode like for hardware PWM, but
// instead of letting the Output Match Comparator control the led pin
// (which is not possible since the backlight is not wired to PWM pins on the
// CPU), we do the LED on/off by oursleves.
// The timer is setup to count up to 0xFFFF, and we set the Output Compare
// register to the current 16bits backlight level (after CIE correction). 
// This means the CPU will trigger a compare match interrupt when the counter 
// reaches the backlight level, where we turn off the LEDs, 
// but also an overflow interrupt when the counter rolls back to 0, 
// in which we're going to turn on the LEDs.
// The LED will then be on for OCRxx/0xFFFF time, adjusted every 244Hz.

// Triggered when the counter reaches the OCRx value
ISR(TIMERx_COMPA_vect) {
  FOR_EACH_LED(
    backlight_off(backlight_pin);
  )
}

// Triggered when the counter reaches the TOP value
// this one triggers at F_CPU/65536 =~ 244 Hz 
ISR(TIMERx_OVF_vect) {
#ifdef BACKLIGHT_BREATHING
  breathing_task();
#endif
  // for very small values of OCRxx (or backlight level)
  // we can't guarantee this whole code won't execute
  // at the same time as the compare match interrupt
  // which means that we might turn on the leds while
  // trying to turn them off, leading to flickering
  // artifacts (especially while breathing, because breathing_task
  // takes many computation cycles).
  // so better not turn them on while the counter TOP is very low.
  if (OCRxx > 256) {
    FOR_EACH_LED(
      backlight_on(backlight_pin);
    )
  }
}

#endif

#define TIMER_TOP 0xFFFFU

// See http://jared.geek.nz/2013/feb/linear-led-pwm
static uint16_t cie_lightness(uint16_t v) {
  if (v <= 5243) // if below 8% of max
    return v / 9; // same as dividing by 900%
  else {
    uint32_t y = (((uint32_t) v + 10486) << 8) / (10486 + 0xFFFFUL); // add 16% of max and compare
    // to get a useful result with integer division, we shift left in the expression above
    // and revert what we've done again after squaring.
    y = y * y * y >> 8;
    if (y > 0xFFFFUL) // prevent overflow
      return 0xFFFFU;
    else
      return (uint16_t) y;
  }
}

// range for val is [0..TIMER_TOP]. PWM pin is high while the timer count is below val.
static inline void set_pwm(uint16_t val) {
	OCRxx = val;
}

#ifndef BACKLIGHT_CUSTOM_DRIVER
__attribute__ ((weak))
void backlight_set(uint8_t level) {
  if (level > BACKLIGHT_LEVELS)
    level = BACKLIGHT_LEVELS;

  if (level == 0) {
    #ifdef BACKLIGHT_PWM_TIMER
      if (OCRxx) {
        TIMSK &= ~(_BV(OCIExA));
        TIMSK &= ~(_BV(TOIEx));
        FOR_EACH_LED(
          backlight_off(backlight_pin);
        )
      }
    #else
    // Turn off PWM control on backlight pin
    TCCRxA &= ~(_BV(COMxx1));
    #endif
  } else {
    #ifdef BACKLIGHT_PWM_TIMER
      if (!OCRxx) {
        TIMSK |= _BV(OCIExA);
        TIMSK |= _BV(TOIEx);
      }
    #else
    // Turn on PWM control of backlight pin
    TCCRxA |= _BV(COMxx1);
    #endif
  }
  // Set the brightness
  set_pwm(cie_lightness(TIMER_TOP * (uint32_t)level / BACKLIGHT_LEVELS));
}

void backlight_task(void) {}
#endif  // BACKLIGHT_CUSTOM_DRIVER

#ifdef BACKLIGHT_BREATHING

#define BREATHING_NO_HALT  0
#define BREATHING_HALT_OFF 1
#define BREATHING_HALT_ON  2
#define BREATHING_STEPS 128

static uint8_t breathing_period = BREATHING_PERIOD;
static uint8_t breathing_halt = BREATHING_NO_HALT;
static uint16_t breathing_counter = 0;

#ifdef BACKLIGHT_PWM_TIMER
static bool breathing = false;

bool is_breathing(void) {
  return breathing;
}

#define breathing_interrupt_enable() do { breathing = true; } while (0)
#define breathing_interrupt_disable() do { breathing = false; } while (0)
#else

bool is_breathing(void) {
    return !!(TIMSK1 & _BV(TOIE1));
}

#define breathing_interrupt_enable() do {TIMSK1 |= _BV(TOIE1);} while (0)
#define breathing_interrupt_disable() do {TIMSK1 &= ~_BV(TOIE1);} while (0)
#endif

#define breathing_min() do {breathing_counter = 0;} while (0)
#define breathing_max() do {breathing_counter = breathing_period * 244 / 2;} while (0)

void breathing_enable(void)
{
  breathing_counter = 0;
  breathing_halt = BREATHING_NO_HALT;
  breathing_interrupt_enable();
}

void breathing_pulse(void)
{
    if (get_backlight_level() == 0)
      breathing_min();
    else
      breathing_max();
    breathing_halt = BREATHING_HALT_ON;
    breathing_interrupt_enable();
}

void breathing_disable(void)
{
    breathing_interrupt_disable();
    // Restore backlight level
    backlight_set(get_backlight_level());
}

void breathing_self_disable(void)
{
  if (get_backlight_level() == 0)
    breathing_halt = BREATHING_HALT_OFF;
  else
    breathing_halt = BREATHING_HALT_ON;
}

void breathing_toggle(void) {
  if (is_breathing())
    breathing_disable();
  else
    breathing_enable();
}

void breathing_period_set(uint8_t value)
{
  if (!value)
    value = 1;
  breathing_period = value;
}

void breathing_period_default(void) {
  breathing_period_set(BREATHING_PERIOD);
}

void breathing_period_inc(void)
{
  breathing_period_set(breathing_period+1);
}

void breathing_period_dec(void)
{
  breathing_period_set(breathing_period-1);
}

/* To generate breathing curve in python:
 * from math import sin, pi; [int(sin(x/128.0*pi)**4*255) for x in range(128)]
 */
static const uint8_t breathing_table[BREATHING_STEPS] PROGMEM = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 17, 20, 24, 28, 32, 36, 41, 46, 51, 57, 63, 70, 76, 83, 91, 98, 106, 113, 121, 129, 138, 146, 154, 162, 170, 178, 185, 193, 200, 207, 213, 220, 225, 231, 235, 240, 244, 247, 250, 252, 253, 254, 255, 254, 253, 252, 250, 247, 244, 240, 235, 231, 225, 220, 213, 207, 200, 193, 185, 178, 170, 162, 154, 146, 138, 129, 121, 113, 106, 98, 91, 83, 76, 70, 63, 57, 51, 46, 41, 36, 32, 28, 24, 20, 17, 15, 12, 10, 8, 6, 5, 4, 3, 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};

// Use this before the cie_lightness function.
static inline uint16_t scale_backlight(uint16_t v) {
  return v / BACKLIGHT_LEVELS * get_backlight_level();
}

#ifdef BACKLIGHT_PWM_TIMER
void breathing_task(void)
#else
/* Assuming a 16MHz CPU clock and a timer that resets at 64k (ICR1), the following interrupt handler will run
 * about 244 times per second.
 */
ISR(TIMER1_OVF_vect)
#endif
{
  uint16_t interval = (uint16_t) breathing_period * 244 / BREATHING_STEPS;
  // resetting after one period to prevent ugly reset at overflow.
  breathing_counter = (breathing_counter + 1) % (breathing_period * 244);
  uint8_t index = breathing_counter / interval % BREATHING_STEPS;

  if (((breathing_halt == BREATHING_HALT_ON) && (index == BREATHING_STEPS / 2)) ||
      ((breathing_halt == BREATHING_HALT_OFF) && (index == BREATHING_STEPS - 1)))
  {
      breathing_interrupt_disable();
  }

  set_pwm(cie_lightness(scale_backlight((uint16_t) pgm_read_byte(&breathing_table[index]) * 0x0101U)));
}

#endif // BACKLIGHT_BREATHING

__attribute__ ((weak))
void backlight_init_ports(void)
{
  // Setup backlight pin as output and output to on state.
  FOR_EACH_LED(
    setPinOutput(backlight_pin);
    backlight_on(backlight_pin);
  )

  // I could write a wall of text here to explain... but TL;DW
  // Go read the ATmega32u4 datasheet.
  // And this: http://blog.saikoled.com/post/43165849837/secret-konami-cheat-code-to-high-resolution-pwm-on

#ifdef BACKLIGHT_PWM_TIMER
  // TimerX setup, Fast PWM mode count to TOP set in ICRx
  TCCRxA = _BV(WGM11); // = 0b00000010;
  // clock select clk/1
  TCCRxB = _BV(WGM13) | _BV(WGM12) | _BV(CS10); // = 0b00011001;
#else // hardware PWM
  // Pin PB7 = OCR1C (Timer 1, Channel C)
  // Compare Output Mode = Clear on compare match, Channel C = COM1C1=1 COM1C0=0
  // (i.e. start high, go low when counter matches.)
  // WGM Mode 14 (Fast PWM) = WGM13=1 WGM12=1 WGM11=1 WGM10=0
  // Clock Select = clk/1 (no prescaling) = CS12=0 CS11=0 CS10=1

  /*
  14.8.3:
  "In fast PWM mode, the compare units allow generation of PWM waveforms on the OCnx pins. Setting the COMnx1:0 bits to two will produce a non-inverted PWM [..]."
  "In fast PWM mode the counter is incremented until the counter value matches either one of the fixed values 0x00FF, 0x01FF, or 0x03FF (WGMn3:0 = 5, 6, or 7), the value in ICRn (WGMn3:0 = 14), or the value in OCRnA (WGMn3:0 = 15)."
  */
  TCCRxA = _BV(COMxx1) | _BV(WGM11);            // = 0b00001010;
  TCCRxB = _BV(WGM13) | _BV(WGM12) | _BV(CS10); // = 0b00011001;
#endif
  // Use full 16-bit resolution. Counter counts to ICR1 before reset to 0.
  ICRx = TIMER_TOP;

  backlight_init();
  #ifdef BACKLIGHT_BREATHING
    breathing_enable();
  #endif
}

#endif // hardware backlight

#else // no backlight

__attribute__ ((weak))
void backlight_init_ports(void) {}

__attribute__ ((weak))
void backlight_set(uint8_t level) {}

#endif // backlight

#ifdef HD44780_ENABLED
#include "hd44780.h"
#endif


// Functions for spitting out values
//

void send_dword(uint32_t number) { // this might not actually work
    uint16_t word = (number >> 16);
    send_word(word);
    send_word(number & 0xFFFFUL);
}

void send_word(uint16_t number) {
    uint8_t byte = number >> 8;
    send_byte(byte);
    send_byte(number & 0xFF);
}

void send_byte(uint8_t number) {
    uint8_t nibble = number >> 4;
    send_nibble(nibble);
    send_nibble(number & 0xF);
}

void send_nibble(uint8_t number) {
    switch (number) {
        case 0:
            register_code(KC_0);
            unregister_code(KC_0);
            break;
        case 1 ... 9:
            register_code(KC_1 + (number - 1));
            unregister_code(KC_1 + (number - 1));
            break;
        case 0xA ... 0xF:
            register_code(KC_A + (number - 0xA));
            unregister_code(KC_A + (number - 0xA));
            break;
    }
}


__attribute__((weak))
uint16_t hex_to_keycode(uint8_t hex)
{
  hex = hex & 0xF;
  if (hex == 0x0) {
    return KC_0;
  } else if (hex < 0xA) {
    return KC_1 + (hex - 0x1);
  } else {
    return KC_A + (hex - 0xA);
  }
}

void api_send_unicode(uint32_t unicode) {
#ifdef API_ENABLE
    uint8_t chunk[4];
    dword_to_bytes(unicode, chunk);
    MT_SEND_DATA(DT_UNICODE, chunk, 5);
#endif
}

__attribute__ ((weak))
void led_set_user(uint8_t usb_led) {

}

__attribute__ ((weak))
void led_set_kb(uint8_t usb_led) {
    led_set_user(usb_led);
}

__attribute__ ((weak))
void led_init_ports(void)
{

}

__attribute__ ((weak))
void led_set(uint8_t usb_led)
{

  // Example LED Code
  //
    // // Using PE6 Caps Lock LED
    // if (usb_led & (1<<USB_LED_CAPS_LOCK))
    // {
    //     // Output high.
    //     DDRE |= (1<<6);
    //     PORTE |= (1<<6);
    // }
    // else
    // {
    //     // Output low.
    //     DDRE &= ~(1<<6);
    //     PORTE &= ~(1<<6);
    // }

#if defined(BACKLIGHT_CAPS_LOCK) && defined(BACKLIGHT_ENABLE)
  // Use backlight as Caps Lock indicator
  uint8_t bl_toggle_lvl = 0;

  if (IS_LED_ON(usb_led, USB_LED_CAPS_LOCK) && !backlight_config.enable) {
    // Turning Caps Lock ON and backlight is disabled in config
    // Toggling backlight to the brightest level
    bl_toggle_lvl = BACKLIGHT_LEVELS;
  } else if (IS_LED_OFF(usb_led, USB_LED_CAPS_LOCK) && backlight_config.enable) {
    // Turning Caps Lock OFF and backlight is enabled in config
    // Toggling backlight and restoring config level
    bl_toggle_lvl = backlight_config.level;
  }

  // Set level without modify backlight_config to keep ability to restore state
  backlight_set(bl_toggle_lvl);
#endif

  led_set_kb(usb_led);
}


//------------------------------------------------------------------------------
// Override these functions in your keymap file to play different tunes on
// different events such as startup and bootloader jump

__attribute__ ((weak))
void startup_user() {}

__attribute__ ((weak))
void shutdown_user() {}

//------------------------------------------------------------------------------