adds a sequencer to the music mode (#330)

* implements leader key for planck experimental

* allows override of leader timeout

* adds ability to use the leader key in seq

* fixes leader keycode

* adds chording prototype

* fixes keycode detection

* moves music mode to quantum.c

* disables chording by default

* adds music sequencer functionality

* implements audio/music functions in quantum.c

* Merge branch 'master' into process-record

4 files changed, 119 insertions, 12 deletions

diff --git a/quantum/audio/audio.c b/quantum/audio/audio.c
index 27b64f8c96..243f49f0ee 100644
--- a/quantum/audio/audio.c
+++ b/quantum/audio/audio.c
@@ -478,12 +478,11 @@ void increase_tempo(uint8_t tempo_change) {
 // Override these functions in your keymap file to play different tunes on
 // startup and bootloader jump
 __attribute__ ((weak))
-void play_startup_tone()
-{
-}
+void play_startup_tone() {}
 
 __attribute__ ((weak))
-void play_goodbye_tone()
-{
-}
+void play_goodbye_tone() {}
+
+__attribute__ ((weak))
+void audio_on_callback(void) {}
 //------------------------------------------------------------------------------
diff --git a/quantum/audio/audio.h b/quantum/audio/audio.h
index 4ba879bbb1..fe85061318 100644
--- a/quantum/audio/audio.h
+++ b/quantum/audio/audio.h
@@ -29,6 +29,7 @@ bool is_audio_on(void);
 void audio_toggle(void);
 void audio_on(void);
 void audio_off(void);
+void audio_on_callback(void);
 
 // Vibrato rate functions
 
diff --git a/quantum/keymap_common.h b/quantum/keymap_common.h
index 2ad1ba6c60..4107d575be 100644
--- a/quantum/keymap_common.h
+++ b/quantum/keymap_common.h
@@ -191,8 +191,6 @@ extern const uint16_t fn_actions[];
 
 #define RESET 0x5000
 #define DEBUG 0x5001
-#define KC_LEAD 0x5014
-
 
 // MAGIC keycodes
 #define MAGIC_SWAP_CONTROL_CAPSLOCK      0x5002
@@ -217,6 +215,19 @@ extern const uint16_t fn_actions[];
 #define AG_SWAP MAGIC_SWAP_ALT_GUI
 #define AG_NORM MAGIC_UNSWAP_ALT_GUI
 
+#define KC_LEAD 0x5014
+
+// Audio on/off
+#define AU_ON  0x5020
+#define AU_OFF 0x5021
+
+// Music mode on/off
+#define MU_ON  0x5022
+#define MU_OFF 0x5023
+
+// Music voice iterate
+#define MUV_IN 0x5024
+#define MUV_DE 0x5025
 
 // GOTO layer - 16 layers max
 // when:
diff --git a/quantum/quantum.c b/quantum/quantum.c
index e274d846f2..cd7fdbb7fe 100644
--- a/quantum/quantum.c
+++ b/quantum/quantum.c
@@ -21,6 +21,7 @@ void leader_end(void) {}
   uint8_t starting_note = 0x0C;
   int offset = 0;
   bool music_activated = false;
+  float music_scale[][2] = SONG(MUSIC_SCALE_SOUND);
 #endif
 
 // Leader key stuff
@@ -60,6 +61,15 @@ bool keys_chord(uint8_t keys[]) {
   return (pass && (in == keys_size));
 }
 
+static bool music_sequence_recording = false;
+static bool music_sequence_playing = false;
+static float music_sequence[16] = {0};
+static uint8_t music_sequence_count = 0;
+static uint8_t music_sequence_position = 0;
+
+static uint16_t music_sequence_timer = 0;
+static uint16_t music_sequence_interval = 100;
+
 bool process_action_quantum(keyrecord_t *record) {
 
   /* This gets the keycode from the key pressed */
@@ -81,12 +91,87 @@ bool process_action_quantum(keyrecord_t *record) {
   #endif
 
   #ifdef AUDIO_ENABLE
-    if (music_activated) {
+    if (keycode == AU_ON && record->event.pressed) {
+      audio_on();
+      audio_on_callback();
+      return false;
+    }
+
+    if (keycode == AU_OFF && record->event.pressed) {
+      audio_off();
+      return false;
+    }
+
+    if (keycode == MU_ON && record->event.pressed) {
+      music_activated = true;
+      PLAY_NOTE_ARRAY(music_scale, false, 0);
+      return false;
+    }
+
+    if (keycode == MU_OFF && record->event.pressed) {
+      music_activated = false;
+      stop_all_notes();
+      return false;
+    }
+
+    if (keycode == MUV_IN && record->event.pressed) {
+      voice_iterate();
+      PLAY_NOTE_ARRAY(music_scale, false, 0);
+      return false;
+    }
+
+    if (keycode == MUV_DE && record->event.pressed) {
+      voice_deiterate();
+      PLAY_NOTE_ARRAY(music_scale, false, 0);
+      return false;
+    }
+
+    if (music_activated) {   
+
+      if (keycode == KC_LCTL && record->event.pressed) { // Start recording
+        stop_all_notes();
+        music_sequence_recording = true;
+        music_sequence_playing = false;
+        music_sequence_count = 0;
+        return false;
+      }
+      if (keycode == KC_LALT && record->event.pressed) { // Stop recording/playing
+        stop_all_notes();
+        music_sequence_recording = false;
+        music_sequence_playing = false;
+        return false;
+      }
+      if (keycode == KC_LGUI && record->event.pressed) { // Start playing
+        stop_all_notes();
+        music_sequence_recording = false;
+        music_sequence_playing = true;
+        music_sequence_position = 0;
+        music_sequence_timer = 0;
+        return false;
+      }
+
+      if (keycode == KC_UP) {
+        if (record->event.pressed)
+          music_sequence_interval-=10;
+        return false;
+      }
+      if (keycode == KC_DOWN) {
+        if (record->event.pressed)
+          music_sequence_interval+=10;
+        return false;
+      }
+
+      float freq = ((float)220.0)*pow(2.0, -4.0)*pow(2.0,(starting_note + SCALE[record->event.key.col + offset])/12.0+(MATRIX_ROWS - record->event.key.row));
       if (record->event.pressed) {
-          play_note(((double)220.0)*pow(2.0, -4.0)*pow(2.0,(starting_note + SCALE[record->event.key.col + offset])/12.0+(MATRIX_ROWS - record->event.key.row)), 0xF);
+        play_note(freq, 0xF);
+        if (music_sequence_recording) {
+          music_sequence[music_sequence_count] = freq;
+          music_sequence_count++;
+        }
       } else {
-          stop_note(((double)220.0)*pow(2.0, -4.0)*pow(2.0,(starting_note + SCALE[record->event.key.col + offset])/12.0+(MATRIX_ROWS - record->event.key.row)));
-      }
+        stop_note(freq);
+      }  
+
       if (keycode < 0xFF) // ignores all normal keycodes, but lets RAISE, LOWER, etc through
         return false;
     }
@@ -163,5 +248,16 @@ void matrix_init_quantum() {
 }
 
 void matrix_scan_quantum() {
+  #ifdef AUDIO_ENABLE
+  if (music_sequence_playing) {
+    if ((music_sequence_timer == 0) || (timer_elapsed(music_sequence_timer) > music_sequence_interval)) {
+      music_sequence_timer = timer_read();
+      stop_note(music_sequence[(music_sequence_position - 1 < 0)?(music_sequence_position - 1 + music_sequence_count):(music_sequence_position - 1)]);
+      play_note(music_sequence[music_sequence_position], 0xF);
+      music_sequence_position = (music_sequence_position + 1) % music_sequence_count;
+    }
+  }
+
+  #endif
   matrix_scan_kb();
 }
\ No newline at end of file