[Keymap] Romain's Preonic layout (#7067)

* Add customized preonic layout

* Add a README detailing a bit the differences from the default preonic layout

* Apply suggestions from code review

Co-Authored-By: fauxpark <fauxpark@gmail.com>

* Remove unnecessary end-of-line backslashes

* Import fix for startup sound (thanks @drashna)

* Remove unnecessary layers and keycodes

* Bring back the _QWERTY layer code

Co-Authored-By: noroadsleft <18669334+noroadsleft@users.noreply.github.com>

4 files changed, 335 insertions, 0 deletions

diff --git a/keyboards/preonic/keymaps/cranium/config.h b/keyboards/preonic/keymaps/cranium/config.h
new file mode 100644
index 000000000..6d73958ad
--- /dev/null
+++ b/keyboards/preonic/keymaps/cranium/config.h
@@ -0,0 +1,38 @@
+#pragma once
+
+
+#ifdef AUDIO_ENABLE
+    #define STARTUP_SONG SONG(PREONIC_SOUND)
+    // #define STARTUP_SONG SONG(NO_SOUND)
+
+    #define DEFAULT_LAYER_SONGS { SONG(QWERTY_SOUND), \
+                                  SONG(COLEMAK_SOUND), \
+                                  SONG(DVORAK_SOUND) \
+                                }
+#endif
+
+#define MUSIC_MASK (keycode != KC_NO)
+
+/*
+ * MIDI options
+ */
+
+/* Prevent use of disabled MIDI features in the keymap */
+//#define MIDI_ENABLE_STRICT 1
+
+/* enable basic MIDI features:
+   - MIDI notes can be sent when in Music mode is on
+*/
+
+#define MIDI_BASIC
+
+/* enable advanced MIDI features:
+   - MIDI notes can be added to the keymap
+   - Octave shift and transpose
+   - Virtual sustain, portamento, and modulation wheel
+   - etc.
+*/
+//#define MIDI_ADVANCED
+
+/* override number of MIDI tone keycodes (each octave adds 12 keycodes and allocates 12 bytes) */
+//#define MIDI_TONE_KEYCODE_OCTAVES 2
diff --git a/keyboards/preonic/keymaps/cranium/keymap.c b/keyboards/preonic/keymaps/cranium/keymap.c
new file mode 100644
index 000000000..d640ff849
--- /dev/null
+++ b/keyboards/preonic/keymaps/cranium/keymap.c
@@ -0,0 +1,224 @@
+/* Copyright 2015-2017 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 QMK_KEYBOARD_H
+#include "muse.h"
+
+enum preonic_layers {
+  _QWERTY,
+  _LOWER,
+  _RAISE,
+  _ADJUST
+};
+
+enum preonic_keycodes {
+  LOWER = SAFE_RANGE,
+  RAISE,
+};
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+
+/* Qwerty (base layer)
+ * ,-----------------------------------------------------------------------------------.
+ * |   `  |   1  |   2  |   3  |   4  |   5  |   6  |   7  |   8  |   9  |   0  | Esc  |
+ * |------+------+------+------+------+------+------+------+------+------+------+------|
+ * | Tab  |   Q  |   W  |   E  |   R  |   T  |   Y  |   U  |   I  |   O  |   P  | Esc  |
+ * |------+------+------+------+------+-------------+------+------+------+------+------|
+ * | Bksp |   A  |   S  |   D  |   F  |   G  |   H  |   J  |   K  |   L  |   ;  |  "   |
+ * |------+------+------+------+------+------|------+------+------+------+------+------|
+ * | Shift|   Z  |   X  |   C  |   V  |   B  |   N  |   M  |   ,  |   .  |   /  |  |   |
+ * |------+------+------+------+------+------+------+------+------+------+------+------|
+ * | Ctrl |  F12 |  GUI | Alt  |Lower |    Space    |Raise |AltGr |   [  |   ]  |Enter |
+ * `-----------------------------------------------------------------------------------'
+ */
+[_QWERTY] = LAYOUT_preonic_grid(
+  KC_GRV,  KC_1,    KC_2,    KC_3,    KC_4,    KC_5,    KC_6,    KC_7,    KC_8,    KC_9,    KC_0,    KC_ESC,
+  KC_TAB,  KC_Q,    KC_W,    KC_E,    KC_R,    KC_T,    KC_Y,    KC_U,    KC_I,    KC_O,    KC_P,    KC_ESC,
+  KC_BSPC, 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_BSLS,
+  KC_LCTL, KC_F12,  KC_LGUI, KC_LALT, LOWER,   KC_SPC,  KC_SPC,  RAISE,   KC_RALT, KC_LBRC, KC_RBRC, KC_ENT
+),
+
+/* Lower
+ * ,-----------------------------------------------------------------------------------.
+ * |  ~   |  F1  |  F2  |  F3  |  F4  |  F5  |  F6  |  F7  |  F8  |  F9  |  F10 |  F11 |
+ * |------+------+------+------+------+-------------+------+------+------+------+------|
+ * |      |   !  |   @  |   #  |   $  |   %  |   ^  |   &  |   *  |   (  |   )  |  Del |
+ * |------+------+------+------+------+-------------+------+------+------+------+------|
+ * | Del  |  F1  |  F2  |  F3  |  F4  |  F5  |  F6  |   -  |   +  |   =  |      |      |
+ * |------+------+------+------+------+------|------+------+------+------+------+------|
+ * | LGUI |  F7  |  F8  |  F9  |  F10 |  F11 |  F12 |   1  |   2  |   3  |   4  |      |
+ * |------+------+------+------+------+------+------+------+------+------+------+------|
+ * |      |      |      |      |      |      _      |      |      |      |      |      |
+ * `-----------------------------------------------------------------------------------'
+ */
+[_LOWER] = LAYOUT_preonic_grid(
+  KC_TILD, KC_F1,   KC_F2,   KC_F3,   KC_F4,   KC_F5,   KC_F6,   KC_F7,   KC_F8,   KC_F9,   KC_F10,  KC_F11,
+  _______, KC_EXLM, KC_AT,   KC_HASH, KC_DLR,  KC_PERC, KC_CIRC, KC_AMPR, KC_ASTR, KC_LPRN, KC_RPRN, KC_DEL,
+  KC_DEL,  KC_F1,   KC_F2,   KC_F3,   KC_F4,   KC_F5,   KC_F6,   KC_MINS, KC_PLUS, KC_EQL,  _______, _______,
+  KC_LGUI, KC_F7,   KC_F8,   KC_F9,   KC_F10,  KC_F11,  KC_F12,  KC_1,    KC_2,    KC_3,    KC_4,    _______,
+  _______, _______, _______, _______, _______, KC_UNDS, KC_UNDS, _______, _______, _______, _______, _______
+),
+
+/* Raise
+ * ,-----------------------------------------------------------------------------------.
+ * |      |   1  |   2  |   3  |   4  |   5  |   6  |   7  |   8  |   9  |   0  |      |
+ * |------+------+------+------+------+------+------+------+------+------+------+------|
+ * |      |   1  |   2  |   3  |   4  |   5  |   6  |   7  |   8  |   9  |   0  |      |
+ * |------+------+------+------+------+-------------+------+------+------+------+------|
+ * | Del  |  F1  |  F2  |  F3  |  F4  |  F5  |  F6  |  Up  | Down | Left |Right |      |
+ * |------+------+------+------+------+------|------+------+------+------+------+------|
+ * |      |  F7  |  F8  |  F9  |  F10 |  F11 |  F12 | Home | End  |      |      | Shift|
+ * |------+------+------+------+------+------+------+------+------+------+------+------|
+ * |      |      |      |      |      |      _      |      |      |      |      |      |
+ * `-----------------------------------------------------------------------------------'
+ */
+[_RAISE] = LAYOUT_preonic_grid(
+  _______, KC_1,    KC_2,    KC_3,    KC_4,    KC_5,    KC_6,    KC_7,    KC_8,    KC_9,    KC_0,    KC_BSPC,
+  _______, KC_1,    KC_2,    KC_3,    KC_4,    KC_5,    KC_6,    KC_7,    KC_8,    KC_9,    KC_0,    _______,
+  KC_DEL,  KC_F1,   KC_F2,   KC_F3,   KC_F4,   KC_F5,   KC_F6,   KC_UP,   KC_DOWN, KC_LEFT, KC_RIGHT,_______,
+  _______, KC_F7,   KC_F8,   KC_F9,   KC_F10,  KC_F11,  KC_F12,  KC_HOME, KC_END,  _______, _______, KC_RSFT,
+  _______, _______, _______, _______, _______, KC_UNDS, KC_UNDS, _______, _______, _______, _______, _______
+),
+
+/* Adjust (Lower + Raise)
+ * ,-----------------------------------------------------------------------------------.
+ * |      |      |      |      |      |      |      |      |      |      |      | Sleep|
+ * |------+------+------+------+------+------+------+------+------+------+------+------|
+ * |      | Reset| Debug|      |      |      |      |      |      |      |      |      |
+ * |------+------+------+------+------+-------------+------+------+------+------+------|
+ * |      |      |      |Aud on|AudOff|AGnorm|AGswap| Vol+ | Vol- | Prev | Next |      |
+ * |------+------+------+------+------+------|------+------+------+------+------+------|
+ * |      |Voice-|Voice+|Mus on|MusOff|MidiOn|MidOff|      |      |      |      |      |
+ * |------+------+------+------+------+------+------+------+------+------+------+------|
+ * |      |      |      |      |      |    Play     |      |      |      |      | PrScr|
+ * `-----------------------------------------------------------------------------------'
+ */
+[_ADJUST] = LAYOUT_preonic_grid(
+  _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, KC_SLEP,
+  _______, RESET,   DEBUG,   _______, _______, _______, _______, TERM_ON, TERM_OFF,_______, _______, _______,
+  _______, _______, MU_MOD,  AU_ON,   AU_OFF,  AG_NORM, AG_SWAP, KC_VOLU, KC_VOLD, KC_MPRV, KC_MNXT, _______,
+  _______, MUV_DE,  MUV_IN,  MU_ON,   MU_OFF,  MI_ON,   MI_OFF,  _______, _______, _______, _______, _______,
+  _______, _______, _______, _______, _______, KC_MPLY, KC_MPLY, _______, _______, _______, _______, KC_PSCR
+)
+
+
+};
+
+bool process_record_user(uint16_t keycode, keyrecord_t *record) {
+  switch (keycode) {
+        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;
+      }
+    return true;
+};
+
+bool muse_mode = false;
+uint8_t last_muse_note = 0;
+uint16_t muse_counter = 0;
+uint8_t muse_offset = 70;
+uint16_t muse_tempo = 50;
+
+void encoder_update_user(uint8_t index, bool clockwise) {
+  if (muse_mode) {
+    if (IS_LAYER_ON(_RAISE)) {
+      if (clockwise) {
+        muse_offset++;
+      } else {
+        muse_offset--;
+      }
+    } else {
+      if (clockwise) {
+        muse_tempo+=1;
+      } else {
+        muse_tempo-=1;
+      }
+    }
+  } else {
+    if (clockwise) {
+      tap_code(KC_PGDN);
+    } else {
+      tap_code(KC_PGUP);
+    }
+  }
+}
+
+void dip_update(uint8_t index, bool active) {
+  switch (index) {
+    case 0:
+      if (active) {
+        layer_on(_ADJUST);
+      } else {
+        layer_off(_ADJUST);
+      }
+      break;
+    case 1:
+      if (active) {
+        muse_mode = true;
+      } else {
+        muse_mode = false;
+      }
+   }
+}
+
+void matrix_scan_user(void) {
+  #ifdef AUDIO_ENABLE
+    if (muse_mode) {
+      if (muse_counter == 0) {
+        uint8_t muse_note = muse_offset + SCALE[muse_clock_pulse()];
+        if (muse_note != last_muse_note) {
+          stop_note(compute_freq_for_midi_note(last_muse_note));
+          play_note(compute_freq_for_midi_note(muse_note), 0xF);
+          last_muse_note = muse_note;
+        }
+      }
+      muse_counter = (muse_counter + 1) % muse_tempo;
+    } else {
+      if (muse_counter) {
+        stop_all_notes();
+        muse_counter = 0;
+      }
+    }
+  #endif
+}
+
+bool music_mask_user(uint16_t keycode) {
+  switch (keycode) {
+    case RAISE:
+    case LOWER:
+      return false;
+    default:
+      return true;
+  }
+}
diff --git a/keyboards/preonic/keymaps/cranium/readme.md b/keyboards/preonic/keymaps/cranium/readme.md
new file mode 100644
index 000000000..0f1d99598
--- /dev/null
+++ b/keyboards/preonic/keymaps/cranium/readme.md
@@ -0,0 +1,72 @@
+# Cranium's Preonic layout
+
+This layout is based on the Preonic default with some changes I find interesting to share.
+
+## Default layer
+```
+ ,-----------------------------------------------------------------------------------.
+ |   `  |   1  |   2  |   3  |   4  |   5  |   6  |   7  |   8  |   9  |   0  | Esc  |
+ |------|------|------|------|------|------|------|------|------|------|------|------|
+ | Tab  |   Q  |   W  |   E  |   R  |   T  |   Y  |   U  |   I  |   O  |   P  | Esc  |
+ |------|------|------|------|------|-------------|------|------|------|------|------|
+ | Bksp |   A  |   S  |   D  |   F  |   G  |   H  |   J  |   K  |   L  |   ;  |  "   |
+ |------|------|------|------|------|------|------|------|------|------|------|------|
+ | Shift|   Z  |   X  |   C  |   V  |   B  |   N  |   M  |   ,  |   .  |   /  |  |   |
+ |------|------|------|------|------|------|------|------|------|------|------|------|
+ | Ctrl |  F12 |  GUI | Alt  |Lower |    Space    |Raise |AltGr |   [  |   ]  |Enter |
+ `-----------------------------------------------------------------------------------'
+```
+- As a Colemak user, Capslock was rebound to Backspace.
+- Escape was moved to the top-right of the keyboard
+- Enter was moved to the bottom-right of the keyboard. It's now easy to hit and can even be activated with the palm.
+- An F12 was put next to the left CTRL => it's the shortcut I use to toggle the Guake terminal.
+- I don't really use the key below my Escape (top-right, 2nd row), so I'll consider any ideas for the moment.
+
+
+## Lower
+```
+ ,-----------------------------------------------------------------------------------.
+ |  ~   |  F1  |  F2  |  F3  |  F4  |  F5  |  F6  |  F7  |  F8  |  F9  |  F10 |  F11 |
+ |------|------|------|------|------|-------------|------|------|------|------|------|
+ |      |   !  |   @  |   #  |   $  |   %  |   ^  |   &  |   *  |   (  |   )  |  Del |
+ |------|------|------|------|------|-------------|------|------|------|------|------|
+ | Del  |  F1  |  F2  |  F3  |  F4  |  F5  |  F6  |   -  |   +  |   =  |      |      |
+ |------|------|------|------|------|------|------|------|------|------|------|------|
+ | LGUI |  F7  |  F8  |  F9  |  F10 |  F11 |  F12 |   1  |   2  |   3  |   4  |      |
+ |------|------|------|------|------|------|------|------|------|------|------|------|
+ |      |      |      |      |      |      _      |      |      |      |      |      |
+ `-----------------------------------------------------------------------------------'
+```
+- Not much changes here
+
+## Raise
+```
+ ,-----------------------------------------------------------------------------------.
+ |      |   1  |   2  |   3  |   4  |   5  |   6  |   7  |   8  |   9  |   0  |      |
+ |------|------|------|------|------|------|------|------|------|------|------|------|
+ |      |   1  |   2  |   3  |   4  |   5  |   6  |   7  |   8  |   9  |   0  |      |
+ |------|------|------|------|------|-------------|------|------|------|------|------|
+ | Del  |  F1  |  F2  |  F3  |  F4  |  F5  |  F6  |  Up  | Down | Left |Right |      |
+ |------|------|------|------|------|------|------|------|------|------|------|------|
+ |      |  F7  |  F8  |  F9  |  F10 |  F11 |  F12 | Home | End  |      |      | Shift|
+ |------|------|------|------|------|------|------|------|------|------|------|------|
+ |      |      |      |      |      |      _      |      |      |      |      |      |
+ `-----------------------------------------------------------------------------------'
+```
+- Perhaps one of the most interesting change: the arrow keys were moved to the right-hand home row, activated with the Raise layer. It means I can use the arrow keys without moving my hand from the home row, by activating the Raise layer with my thumb. It took a while to adapt but it was totally worth it. To note, I also put Home/End on the same layer but one row below, with I also find really useful.
+
+## Adjust
+```
+ ,-----------------------------------------------------------------------------------.
+ |      |      |      |      |      |      |      |      |      |      |      | Sleep|
+ |------|------|------|------|------|------|------|------|------|------|------|------|
+ |      | Reset| Debug|      |      |      |      |      |      |      |      |      |
+ |------|------|------|------|------|-------------|------|------|------|------|------|
+ |      |      |      |Aud on|AudOff|AGnorm|AGswap| Vol+ | Vol- | Prev | Next |      |
+ |------|------|------|------|------|------|------|------|------|------|------|------|
+ |      |Voice-|Voice+|Mus on|MusOff|MidiOn|MidOff|      |      |      |      |      |
+ |------|------|------|------|------|------|------|------|------|------|------|------|
+ |      |      |      |      |      |    Play     |      |      |      |      | PrScr|
+ `-----------------------------------------------------------------------------------'
+```
+- The "arrow" keys act as Vol+/Vol-/Previous/Next on the Adjust layer (which is quite a natural mapping for these media keys).
diff --git a/keyboards/preonic/keymaps/cranium/rules.mk b/keyboards/preonic/keymaps/cranium/rules.mk
new file mode 100644
index 000000000..dcf16bef3
--- /dev/null
+++ b/keyboards/preonic/keymaps/cranium/rules.mk
@@ -0,0 +1 @@
+SRC += muse.c