Add support for the DURGOD Taurus K320 keyboard (#11399)

* Initial support for Durgod K320 with BootMagic Lite

- Adding missing files
- Add Unicode Map Support & new user keymap
- Remove personalized features from Default keymap
- Added Unicode Map to both Default and kuenhlee keymap.c
- Updated readme.md
- Added additional Fn Shortcut keys

* Additional support for Durgod K320

- Simplifying default keymap
- Renaming durgod_k320 => durgod/k320
- Removing copy of ST_NUCLEO64_F070RB from K320. Replacing with local board.h
- Adding Mac keyboard layout for K320 as alternative via Fn+F12
- Implementing Windows Key lock on K320
- Cleaning up duplicated core functionality
- Adding default_toggle_mac_windows keymap with:
  - Ability to toggle between Windows and MacOS layout
  - Mac Media Lock functionality.

* Updating K320 keymap readme

Co-authored-by: kuenhlee <eos.camera.lee@gmail.com>

2 files changed, 437 insertions, 0 deletions

diff --git a/keyboards/durgod/k320/keymaps/default_toggle_mac_windows/keymap.c b/keyboards/durgod/k320/keymaps/default_toggle_mac_windows/keymap.c
new file mode 100644
index 0000000000..7fcf52cfe0
--- /dev/null
+++ b/keyboards/durgod/k320/keymaps/default_toggle_mac_windows/keymap.c
@@ -0,0 +1,373 @@
+/* Copyright 2021 kuenhlee and Don Kjer
+ *
+ * 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 QMK_KEYBOARD_H
+
+// Layer shorthand
+enum _layer {
+    _WBL,
+    _WFL,
+    _WSL,
+    _MBL,
+    _MFL,
+    _MSL
+};
+
+#ifndef DEFAULT_LAYOUT
+# define DEFAULT_LAYOUT _WBL // Change to _MBL to boot into Mac layout.
+#endif
+#ifndef ALT_LAYOUT
+# define ALT_LAYOUT     _MBL // Layout to display 'MR' led when active.
+#endif
+
+static bool win_key_locked = false;
+static bool mac_media_locked = false;
+static bool win_appkey_pressed = false;
+static bool mac_fnkey_pressed = false;
+
+
+// Defines the keycodes used by our macros in process_record_user
+enum custom_keycodes {
+    KC_TGUI = SAFE_RANGE,  // Toggle between GUI Lock or Unlock (Windows)
+    KC_TMED,               // Toggle between Fx keys or Media keys (Mac)
+    KC_WFN,                // Windows function key
+    KC_MFN,                // Mac function key
+    MO_WSL,                // Windows system key
+    MO_MSL,                // Mac system key
+    DF_W2MBL,              // Change layout from Windows to Mac
+    DF_M2WBL               // Change layout from Mac to Windows
+};
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+  /* Keymap _WBL: Windows Base Layer (Default Layer)
+   * ,-----------------------------------------------------------.  ,--------------.
+   * |Esc  |f1| f2| f3| f4|  | f5| f6| f7| f8|   | f9|f10|f11|f12|  |Prnt|ScLk|Paus|
+   * |-----------------------------------------------------------|  |--------------|
+   * | ` | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |  0| - | = |Backsp |  | Ins|Home|PgUp|
+   * |-----------------------------------------------------------|  |--------------|
+   * |Tab  |  Q|  W|  E|  R|  T|  Y|  U|  I|  O|  P|  [|  ]|    \|  | Del| End|PgDn|
+   * |-----------------------------------------------------------|  `--------------'
+   * |CAPS   |  A|  S|  D|  F|  G|  H|  J|  K|  L|  ;|  '|Return |
+   * |-----------------------------------------------------------|        ,----.
+   * |Shift   |  Z|  X|  C|  V|  B|  N|  M|  ,|  .|  /|Shift     |        | Up |
+   * |-----------------------------------------------------------|   ,-------------.
+   * |Ctrl|Gui |Alt |      Space            |Alt |Func |App|Ctrl |   |Lft| Dn |Rig |
+   * `-----------------------------------------------------------'   `-------------'
+   */
+  [_WBL] = LAYOUT_tkl_ansi( /* Windows Base Layer */
+      KC_ESC,   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_PSCR,  KC_SLCK,  KC_PAUS,
+      KC_GRV,   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_BSPC,  KC_PGUP,
+      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_BSLS,  KC_INS,   KC_HOME,
+      KC_CAPS,  KC_A,     KC_S,     KC_D,     KC_F,     KC_G,     KC_H,     KC_J,     KC_K,     KC_L,     KC_SCLN,  KC_QUOT,            KC_DEL,   KC_END,   KC_PGDN,
+      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_ENT,   KC_UP,
+      KC_LCTL,  KC_LGUI,  KC_LALT,                                KC_SPC,                                 KC_RALT,  KC_WFN,   KC_APP,   KC_RCTL,  KC_LEFT,  KC_DOWN,
+                                                                                                                                                            KC_RGHT
+  ),
+  /* Keymap _WFL: Windows Function Layer
+   * ,-----------------------------------------------------------.  ,--------------.
+   * |   |Play|Stop|Prev|Next| |Mute|Vol+|Vol-|    | |  |  |  |  |  |    |    |    |
+   * |-----------------------------------------------------------|  |--------------|
+   * |   |   |   |   |   |   |   |   |   |   |   |   |   |       |  |    |    |    |
+   * |-----------------------------------------------------------|  |--------------|
+   * |     |   |   |   |   |   |   |   |   |   |   |   |   |     |  |    |    |    |
+   * |-----------------------------------------------------------|  `--------------'
+   * |       |   |   |   |   |   |   |   |   |   |   |   |       |
+   * |-----------------------------------------------------------|        ,----.
+   * |        |   |   |   |   |   |   |   |   |   |   |          |        |    |
+   * |-----------------------------------------------------------|   ,-------------.
+   * |    |Lock|    |                       |    |Func |Sys|     |   |   |    |    |
+   * `-----------------------------------------------------------'   `-------------'
+   */
+  [_WFL] = LAYOUT_tkl_ansi( /* Windows First Layer */
+      _______,  KC_MPLY,  KC_MSTP,  KC_MRWD,  KC_MFFD,  KC_MUTE,  KC_VOLD,  KC_VOLU,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,
+      _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,            _______,  _______,
+      _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,
+      _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,            _______,  _______,  _______,
+      _______,            _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,            _______,  _______,  _______,
+      _______,  KC_TGUI,  _______,                                _______,                                _______,  _______,  MO_WSL,   _______,  _______,  _______,
+                                                                                                                                                            _______
+  ),
+  /* Keymap _WSL: Windows System Layer
+   * ,-----------------------------------------------------------.  ,--------------.
+   * |Reset |Sleep|     |     |Power| |  |  |  |  | |  |  |  |MAC|  |              |
+   * |-----------------------------------------------------------|  |--------------|
+   * |   |   |   |   |   |   |   |   |   |   |   |   |   |       |  |    |    |    |
+   * |-----------------------------------------------------------|  |--------------|
+   * |     |   |   |   |   |   |   |   |   |   |   |   |   |     |  |    |    |    |
+   * |-----------------------------------------------------------|  `--------------'
+   * |       |   |   |   |   |   |   |   |   |   |   |   |       |
+   * |-----------------------------------------------------------|        ,----.
+   * |        |   |   |   |   |   |   |   |   |   |   |          |        |    |
+   * |-----------------------------------------------------------|   ,-------------.
+   * |    |    |    |                       |    |Func |Sys|     |   |   |    |    |
+   * `-----------------------------------------------------------'   `-------------'
+   */
+  [_WSL] = LAYOUT_tkl_ansi( /* Windows Second / System Layer */
+      RESET,    KC_SLEP,  XXXXXXX,  XXXXXXX,  KC_PWR,   XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  DF_W2MBL, XXXXXXX,  XXXXXXX,  XXXXXXX,
+      XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,            XXXXXXX,  XXXXXXX,
+      XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,
+      XXXXXXX,  XXXXXXX,  XXXXXXX,  DEBUG,    XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,            XXXXXXX,  XXXXXXX,  XXXXXXX,
+      XXXXXXX,            XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,            XXXXXXX,  XXXXXXX,  XXXXXXX,
+      XXXXXXX,  XXXXXXX,  XXXXXXX,                                XXXXXXX,                                XXXXXXX,  _______,  _______,  XXXXXXX,  XXXXXXX,  XXXXXXX,
+                                                                                                                                                            XXXXXXX
+  ),
+
+  /* Keymap _MBL: Mac Base Layer (Alternate Layout)
+   * ,-----------------------------------------------------------.  ,--------------.
+   * |Esc  |f1| f2| f3| f4|  | f5| f6| f7| f8|   | f9|f10|f11|f12|  | f13| f14| f15|
+   * |-----------------------------------------------------------|  |--------------|
+   * | ` | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |  0| - | = |Backsp |  | Ins|Home|PgUp|
+   * |-----------------------------------------------------------|  |--------------|
+   * |Tab  |  Q|  W|  E|  R|  T|  Y|  U|  I|  O|  P|  [|  ]|    \|  | Del| End|PgDn|
+   * |-----------------------------------------------------------|  `--------------'
+   * |CAPS   |  A|  S|  D|  F|  G|  H|  J|  K|  L|  ;|  '|Return |
+   * |-----------------------------------------------------------|        ,----.
+   * |Shift   |  Z|  X|  C|  V|  B|  N|  M|  ,|  .|  /|Shift     |        | Up |
+   * |-----------------------------------------------------------|   ,-------------.
+   * |Ctrl|Alt |Gui |      Space            |Gui |Alt|Func |Ctrl |   |Lft| Dn |Rig |
+   * `-----------------------------------------------------------'   `-------------'
+   */
+  [_MBL] = LAYOUT_tkl_ansi( /* Mac Base Layer */
+      KC_ESC,   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_F13,   KC_F14,   KC_F15,
+      KC_GRV,   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_BSPC,  KC_PGUP,
+      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_BSLS,  KC_INS,   KC_HOME,
+      KC_CAPS,  KC_A,     KC_S,     KC_D,     KC_F,     KC_G,     KC_H,     KC_J,     KC_K,     KC_L,     KC_SCLN,  KC_QUOT,            KC_DEL,   KC_END,   KC_PGDN,
+      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_ENT,   KC_UP,
+      KC_LCTL,  KC_LALT,  KC_LGUI,                                KC_SPC,                                 KC_RGUI,  KC_RALT,  KC_MFN,   KC_RCTL,  KC_LEFT,  KC_DOWN,
+                                                                                                                                                            KC_RGHT
+  ),
+  /* Keymap _MFL: Mac Function Layer
+   * ,-----------------------------------------------------------.  ,--------------.
+   * |  |Bri-|Bri+|MCon|LPad| |  |  |Prv|Ply| |Nxt|Mute|Vol-|Vol+|  |TMed|    |    |
+   * |-----------------------------------------------------------|  |--------------|
+   * |   |   |   |   |   |   |   |   |   |   |   |   |   |       |  |    |    |    |
+   * |-----------------------------------------------------------|  |--------------|
+   * |     |   |   |   |   |   |   |   |   |   |   |   |   |     |  |    |    |    |
+   * |-----------------------------------------------------------|  `--------------'
+   * |       |   |   |   |   |   |   |   |   |   |   |   |       |
+   * |-----------------------------------------------------------|        ,----.
+   * |        |   |   |   |   |   |   |   |   |   |   |          |        |    |
+   * |-----------------------------------------------------------|   ,-------------.
+   * |    |    |    |                       |    |Sys|Func |     |   |   |    |    |
+   * `-----------------------------------------------------------'   `-------------'
+   */
+  [_MFL] = LAYOUT_tkl_ansi( /* Mac First Layer */
+      _______,  KC_BRID,  KC_BRIU,  _______,  _______,  _______,  _______,  KC_MRWD,  KC_MPLY,  KC_MFFD,  KC_MUTE,  KC_VOLD,  KC_VOLU,  KC_TMED,  _______,  _______,
+      _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,            _______,  _______,
+      _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,
+      _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,            _______,  _______,  _______,
+      _______,            _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,            _______,  _______,  _______,
+      _______,  _______,  _______,                                _______,                                _______,  MO_MSL,   _______,  _______,  _______,  _______,
+                                                                                                                                                            _______
+  ),
+  /* Keymap _MSL: Mac System Layer
+   * ,-----------------------------------------------------------.  ,--------------.
+   * |Reset |   |    |     |Sleep| |  |  |  |  | |  |  |  |WIN|  |              |
+   * |-----------------------------------------------------------|  |--------------|
+   * |   |   |   |   |   |   |   |   |   |   |   |   |   |       |  |    |    |    |
+   * |-----------------------------------------------------------|  |--------------|
+   * |     |   |   |   |   |   |   |   |   |   |   |   |   |     |  |    |    |    |
+   * |-----------------------------------------------------------|  `--------------'
+   * |       |   |   |   |   |   |   |   |   |   |   |   |       |
+   * |-----------------------------------------------------------|        ,----.
+   * |        |   |   |   |   |   |   |   |   |   |   |          |        |    |
+   * |-----------------------------------------------------------|   ,-------------.
+   * |    |    |    |                       |    |Sys|Func |     |   |   |    |    |
+   * `-----------------------------------------------------------'   `-------------'
+   */
+  [_MSL] = LAYOUT_tkl_ansi( /* Mac Second / System Layer */
+      RESET,    XXXXXXX,  XXXXXXX,  XXXXXXX,  KC_SLEP,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  DF_M2WBL, XXXXXXX,  XXXXXXX,  XXXXXXX,
+      XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,            XXXXXXX,  XXXXXXX,
+      XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,
+      XXXXXXX,  XXXXXXX,  XXXXXXX,  DEBUG,    XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,            XXXXXXX,  XXXXXXX,  XXXXXXX,
+      XXXXXXX,            XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,  XXXXXXX,            XXXXXXX,  XXXXXXX,  XXXXXXX,
+      XXXXXXX,  XXXXXXX,  XXXXXXX,                                XXXXXXX,                                XXXXXXX,  _______,  _______,  XXXXXXX,  XXXXXXX,  XXXXXXX,
+                                                                                                                                                            XXXXXXX
+  )
+};
+
+void unlock_win_key(void) {
+    win_key_locked = false;
+    mac_media_locked = false;
+    writePinHigh(LED_WIN_LOCK_PIN);
+}
+
+void toggle_lock_win_key(void) {
+    win_key_locked = !win_key_locked;
+    writePin(LED_WIN_LOCK_PIN, !win_key_locked);
+}
+
+void toggle_lock_media_key(void) {
+  mac_media_locked = !mac_media_locked;
+  writePin(LED_WIN_LOCK_PIN, !mac_media_locked);
+}
+
+#ifdef CONSOLE_ENABLE
+void dprint_global_layers(void) {
+    dprint("Global Layers:");
+    if (IS_LAYER_ON(_WFL)) { dprint(" _WFL"); }
+    if (IS_LAYER_ON(_WSL)) { dprint(" _WSL"); }
+    if (IS_LAYER_ON(_MFL)) { dprint(" _MFL"); }
+    if (IS_LAYER_ON(_MSL)) { dprint(" _MSL"); }
+    dprintf("\n");
+}
+
+void dprint_layers(layer_state_t state) {
+    dprint("Layers:");
+    if (IS_LAYER_ON_STATE(state, _WFL)) { dprint(" _WFL"); }
+    if (IS_LAYER_ON_STATE(state, _WSL)) { dprint(" _WSL"); }
+    if (IS_LAYER_ON_STATE(state, _MFL)) { dprint(" _MFL"); }
+    if (IS_LAYER_ON_STATE(state, _MSL)) { dprint(" _MSL"); }
+    dprintf("\n");
+}
+#endif
+
+layer_state_t default_layer_state_set_user(layer_state_t state) {
+#ifdef CONSOLE_ENABLE
+    dprintf("default_layer_state_set_user: 0x%x\n", state);
+    dprint_global_layers();
+#endif
+    // Disable windows key lock on default layer transition.
+    unlock_win_key();
+    win_appkey_pressed = false;
+    mac_fnkey_pressed = false;
+    writePin(LED_MR_LOCK_PIN, !IS_LAYER_ON_STATE(state, ALT_LAYOUT));
+    return state;
+}
+
+layer_state_t layer_state_set_user(layer_state_t state) {
+#ifdef CONSOLE_ENABLE
+    dprintf("layer_state_set_user: 0x%x\n", state);
+    dprint_layers(state);
+#endif
+    return state;
+}
+
+bool process_record_user(uint16_t keycode, keyrecord_t *record) {
+    switch (keycode) {
+        case KC_TGUI:
+            if (!record->event.pressed) {
+                // Toggle GUI lock on key release
+                toggle_lock_win_key();
+            }
+            break;
+        case KC_TMED:
+            // Only trigger when Fn key is also held down, to avoid accidental unlock.
+            if (!mac_fnkey_pressed) { return false; }
+            if (!record->event.pressed) {
+                // Toggle Media Lock on key release
+                toggle_lock_media_key();
+            }
+            break;
+        case KC_LGUI:
+            if (win_key_locked) { return false; }
+            break;
+        case KC_WFN:
+            // Like MO(_WFL), but also enables _WSL if KC_APP is already pressed down.
+            if (record->event.pressed) {
+                layer_on(_WFL);
+                if (win_appkey_pressed) {
+                    // Also enable Secondary layer if App key is being held down.
+                    win_appkey_pressed = false;
+                    layer_on(_WSL);
+                }
+            } else {
+                if (IS_LAYER_ON(_WFL)) { layer_off(_WFL); }
+                if (IS_LAYER_ON(_MSL)) { layer_off(_MSL); }
+            }
+            break;
+        case KC_APP:
+            if (record->event.pressed) {
+                // Don't actually press down the app menu key
+                win_appkey_pressed = true;
+            } else {
+                if (IS_LAYER_ON(_WSL)) { layer_off(_WSL); }
+                if (IS_LAYER_ON(_MFL)) { layer_off(_MFL); }
+                if (win_appkey_pressed) {
+                    win_appkey_pressed = false;
+                    // Tap the KC_APP key on key release.
+                    tap_code(KC_APP);
+                }
+            }
+            return false;
+            break;
+        case KC_MFN:
+            // Mac Fn key.  Emit Fn keycode, and also transition layers similar to KC_WFN.
+            if (record->event.pressed) {
+                mac_fnkey_pressed = true;
+                layer_on(_MFL);
+                // Also enable Secondary layer if Right-Alt key is being held down.
+                if (get_mods() & MOD_BIT(KC_RALT)) {
+                    layer_on(_MSL);
+                }
+            } else {
+                mac_fnkey_pressed = false;
+                if (!mac_media_locked) {
+                    if (IS_LAYER_ON(_MFL)) { layer_off(_MFL); }
+                    if (IS_LAYER_ON(_WSL)) { layer_off(_WSL); }
+                }
+            }
+            break;
+        case KC_RALT:
+            // Disable MSL/WFL layer on key-up.
+            if (!record->event.pressed) {
+                if (IS_LAYER_ON(_MSL)) { layer_off(_MSL); }
+                if (IS_LAYER_ON(_WFL)) { layer_off(_WFL); }
+            }
+            break;
+        case MO_WSL:
+            if (record->event.pressed) {
+                layer_on(_WSL);
+            } else {
+                if (IS_LAYER_ON(_WSL)) { layer_off(_WSL); }
+                if (IS_LAYER_ON(_MFL)) { layer_off(_MFL); }
+            }
+            break;
+        case MO_MSL:
+            if (record->event.pressed) {
+                layer_on(_MSL);
+            } else {
+                if (IS_LAYER_ON(_MSL)) { layer_off(_MSL); }
+                if (IS_LAYER_ON(_WFL)) { layer_off(_WFL); }
+            }
+            break;
+        case DF_W2MBL:
+            if (!record->event.pressed) {
+                // Switch base layer, but preserve first/secondary layers.
+                default_layer_set(1UL<<_MBL);
+                layer_state_set(1UL<<_MFL | 1UL<<_MSL);
+            }
+            break;
+        case DF_M2WBL:
+            if (!record->event.pressed) {
+                // Switch base layer, but preserve first/secondary layers.
+                default_layer_set(1UL<<_WBL);
+                layer_state_set(1UL<<_WFL | 1UL<<_WSL);
+            }
+            break;
+        case RESET:
+            if (record->event.pressed) {
+                // Flash LEDs to indicate bootloader mode is enabled.
+                on_all_leds();
+            }
+            break;
+    }
+    return true;
+}
+
+void keyboard_post_init_user(void) {
+    default_layer_set(1UL<<DEFAULT_LAYOUT);
+}
+
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+# A keymap for Durgod Taurus K320 that supports toggling between Mac and Windows
+
+Layer 0 : Standard ANSI 87 Keys TKL layout (Windows)
+
+Layer 1 : Media control and Windows lock key (Windows)
+- Reusing Durgod's Original Media Control for Fn + F1 ~ Fn + F7
+- Fn + Windows to toggle Windows lock key functionality
+
+Layer 2 : System layer (Windows)
+- Fn + Menu + Esc : Bootloader mode
+- Fn + Menu + F1  : System Sleep
+- Fn + Menu + F4  : Turning Off System
+- Fn + Menu + F12 : Switch to Mac layout
+
+Layer 3 : Mac 87 Keys TKL layout
+
+Layer 4 : Media control and Media lock key (Mac)
+ - Standard Mac Media keys for Fn + F1 ~ Fn + F12.
+ - Fn + F13 to toggle Media lock key functionality
+
+Layer 5 : System layer (Mac)
+- Fn + R-ALT + Esc : Bootloader mode
+- Fn + R-ALT + F4  : Shutdown/Sleep (Hold down on Mac)
+- Fn + R-ALT + F12 : Switch to Windows layout
+
+## Toggle between Mac and Windows layout
+
+You can switch between Mac and Windows layout by doing the following:
+- Hold down Fn + Menu (Windows Layout) or Fn + Right-Alt (Mac layout)  (These are the same physical keys)
+- Press F12
+
+The 'M' led will be lit when you are using the alternate layout.  By default Mac is the alternate layout.
+
+You can change the default & alternate layout by setting the following flags to either '_WBL'(Windows) or '_MBL' (Mac)
+- DEFAULT_LAYOUT (initial layout to use on boot)
+- ALT_LAYOUT (layout that will light the 'M' LED when active)
+
+For example, to configure Mac as the default layer, and Windows to be the alternate layout, compile with these flags:
+
+    make EXTRAFLAGS="-DDEFAULT_LAYOUT=_MBL -DALT_LAYOUT=_WBL" durgod/k320:default_toggle_mac_windows
+
+## Windows key lock
+
+In windows layout, you can hold down Fn + Windows key to disable the Windows key while in locked mode.  The 'Lock' LED
+indicates if the Windows key is locked.
+
+This is similar to the stock K320 Windows key lock functionality.
+
+## Mac Media Lock
+
+To switch between Function row and Media row in Mac layout, press Fn + PrtSc.  The 'Lock' LED indicator will be lit when in Media row mode.
+
+### Subsequent Flashing
+
+For repeating Flashing you have two options with this keymap:
+1. Use BootMagic
+- BootMagic Lite has been enabled with Assigned "Esc" key 
+- Unplug USB Cable
+- Holding Esc Button 
+- Plug in USB Cable, Keyboard should be in ST-Bootloader state
+2. Use key combination if using default keymap
+- Hold down Fn + Menu (Windows Layout) or Fn + Right-Alt (Mac layout)  (These are the same physical keys)
+- Press Esc.  Keyboard should go into booloader state.
+