implement new features for arm

keyboards/planck/keymaps/audio_out/config.h

@@ -0,0 +1,47 @@
+#ifndef CONFIG_USER_H
+#define CONFIG_USER_H
+
+#include "config_common.h"
+
+#ifdef AUDIO_ENABLE
+    #define STARTUP_SONG SONG(PLANCK_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
+
+#define C6_AUDIO
+#define B7_AUDIO
+
+#undef BACKLIGHT_PIN
+
+#endif

keyboards/planck/keymaps/audio_out/keymap.c

@@ -0,0 +1,264 @@
+/* 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 "planck.h"
+#include "action_layer.h"
+
+extern keymap_config_t keymap_config;
+
+enum planck_layers {
+  _QWERTY,
+  _COLEMAK,
+  _DVORAK,
+  _LOWER,
+  _RAISE,
+  _PLOVER,
+  _ADJUST
+};
+
+enum planck_keycodes {
+  QWERTY = SAFE_RANGE,
+  COLEMAK,
+  DVORAK,
+  PLOVER,
+  LOWER,
+  RAISE,
+  BACKLIT,
+  EXT_PLV
+};
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+
+/* Qwerty
+ * ,-----------------------------------------------------------------------------------.
+ * | Tab  |   Q  |   W  |   E  |   R  |   T  |   Y  |   U  |   I  |   O  |   P  | Bksp |
+ * |------+------+------+------+------+-------------+------+------+------+------+------|
+ * | Esc  |   A  |   S  |   D  |   F  |   G  |   H  |   J  |   K  |   L  |   ;  |  "   |
+ * |------+------+------+------+------+------|------+------+------+------+------+------|
+ * | Shift|   Z  |   X  |   C  |   V  |   B  |   N  |   M  |   ,  |   .  |   /  |Enter |
+ * |------+------+------+------+------+------+------+------+------+------+------+------|
+ * | Brite| Ctrl | Alt  | GUI  |Lower |    Space    |Raise | Left | Down |  Up  |Right |
+ * `-----------------------------------------------------------------------------------'
+ */
+[_QWERTY] = {
+  {KC_TAB,  KC_Q,    KC_W,    KC_E,    KC_R,    KC_T,    KC_Y,    KC_U,    KC_I,    KC_O,    KC_P,    KC_BSPC},
+  {KC_ESC,  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_ENT },
+  {BACKLIT, KC_LCTL, KC_LALT, KC_LGUI, LOWER,   KC_SPC,  KC_SPC,  RAISE,   KC_LEFT, KC_DOWN, KC_UP,   KC_RGHT}
+},
+
+/* Colemak
+ * ,-----------------------------------------------------------------------------------.
+ * | Tab  |   Q  |   W  |   F  |   P  |   G  |   J  |   L  |   U  |   Y  |   ;  | Bksp |
+ * |------+------+------+------+------+-------------+------+------+------+------+------|
+ * | Esc  |   A  |   R  |   S  |   T  |   D  |   H  |   N  |   E  |   I  |   O  |  "   |
+ * |------+------+------+------+------+------|------+------+------+------+------+------|
+ * | Shift|   Z  |   X  |   C  |   V  |   B  |   K  |   M  |   ,  |   .  |   /  |Enter |
+ * |------+------+------+------+------+------+------+------+------+------+------+------|
+ * | Brite| Ctrl | Alt  | GUI  |Lower |    Space    |Raise | Left | Down |  Up  |Right |
+ * `-----------------------------------------------------------------------------------'
+ */
+[_COLEMAK] = {
+  {KC_TAB,  KC_Q,    KC_W,    KC_F,    KC_P,    KC_G,    KC_J,    KC_L,    KC_U,    KC_Y,    KC_SCLN, KC_BSPC},
+  {KC_ESC,  KC_A,    KC_R,    KC_S,    KC_T,    KC_D,    KC_H,    KC_N,    KC_E,    KC_I,    KC_O,    KC_QUOT},
+  {KC_LSFT, KC_Z,    KC_X,    KC_C,    KC_V,    KC_B,    KC_K,    KC_M,    KC_COMM, KC_DOT,  KC_SLSH, KC_ENT },
+  {BACKLIT, KC_LCTL, KC_LALT, KC_LGUI, LOWER,   KC_SPC,  KC_SPC,  RAISE,   KC_LEFT, KC_DOWN, KC_UP,   KC_RGHT}
+},
+
+/* Dvorak
+ * ,-----------------------------------------------------------------------------------.
+ * | Tab  |   "  |   ,  |   .  |   P  |   Y  |   F  |   G  |   C  |   R  |   L  | Bksp |
+ * |------+------+------+------+------+-------------+------+------+------+------+------|
+ * | Esc  |   A  |   O  |   E  |   U  |   I  |   D  |   H  |   T  |   N  |   S  |  /   |
+ * |------+------+------+------+------+------|------+------+------+------+------+------|
+ * | Shift|   ;  |   Q  |   J  |   K  |   X  |   B  |   M  |   W  |   V  |   Z  |Enter |
+ * |------+------+------+------+------+------+------+------+------+------+------+------|
+ * | Brite| Ctrl | Alt  | GUI  |Lower |    Space    |Raise | Left | Down |  Up  |Right |
+ * `-----------------------------------------------------------------------------------'
+ */
+[_DVORAK] = {
+  {KC_TAB,  KC_QUOT, KC_COMM, KC_DOT,  KC_P,    KC_Y,    KC_F,    KC_G,    KC_C,    KC_R,    KC_L,    KC_BSPC},
+  {KC_ESC,  KC_A,    KC_O,    KC_E,    KC_U,    KC_I,    KC_D,    KC_H,    KC_T,    KC_N,    KC_S,    KC_SLSH},
+  {KC_LSFT, KC_SCLN, KC_Q,    KC_J,    KC_K,    KC_X,    KC_B,    KC_M,    KC_W,    KC_V,    KC_Z,    KC_ENT },
+  {BACKLIT, KC_LCTL, KC_LALT, KC_LGUI, LOWER,   KC_SPC,  KC_SPC,  RAISE,   KC_LEFT, KC_DOWN, KC_UP,   KC_RGHT}
+},
+
+/* Lower
+ * ,-----------------------------------------------------------------------------------.
+ * |   ~  |   !  |   @  |   #  |   $  |   %  |   ^  |   &  |   *  |   (  |   )  | Bksp |
+ * |------+------+------+------+------+-------------+------+------+------+------+------|
+ * | Del  |  F1  |  F2  |  F3  |  F4  |  F5  |  F6  |   _  |   +  |   {  |   }  |  |   |
+ * |------+------+------+------+------+------|------+------+------+------+------+------|
+ * |      |  F7  |  F8  |  F9  |  F10 |  F11 |  F12 |ISO ~ |ISO | | Home | End  |      |
+ * |------+------+------+------+------+------+------+------+------+------+------+------|
+ * |      |      |      |      |      |             |      | Next | Vol- | Vol+ | Play |
+ * `-----------------------------------------------------------------------------------'
+ */
+[_LOWER] = {
+  {KC_TILD, KC_EXLM, KC_AT,   KC_HASH, KC_DLR,  KC_PERC, KC_CIRC, KC_AMPR,    KC_ASTR,    KC_LPRN, KC_RPRN, KC_BSPC},
+  {KC_DEL,  KC_F1,   KC_F2,   KC_F3,   KC_F4,   KC_F5,   KC_F6,   KC_UNDS,    KC_PLUS,    KC_LCBR, KC_RCBR, KC_PIPE},
+  {_______, KC_F7,   KC_F8,   KC_F9,   KC_F10,  KC_F11,  KC_F12,  S(KC_NUHS), S(KC_NUBS), KC_HOME, KC_END,  _______},
+  {_______, _______, _______, _______, _______, _______, _______, _______,    KC_MNXT,    KC_VOLD, KC_VOLU, KC_MPLY}
+},
+
+/* Raise
+ * ,-----------------------------------------------------------------------------------.
+ * |   `  |   1  |   2  |   3  |   4  |   5  |   6  |   7  |   8  |   9  |   0  | Bksp |
+ * |------+------+------+------+------+-------------+------+------+------+------+------|
+ * | Del  |  F1  |  F2  |  F3  |  F4  |  F5  |  F6  |   -  |   =  |   [  |   ]  |  \   |
+ * |------+------+------+------+------+------|------+------+------+------+------+------|
+ * |      |  F7  |  F8  |  F9  |  F10 |  F11 |  F12 |ISO # |ISO / |Pg Up |Pg Dn |      |
+ * |------+------+------+------+------+------+------+------+------+------+------+------|
+ * |      |      |      |      |      |             |      | Next | Vol- | Vol+ | Play |
+ * `-----------------------------------------------------------------------------------'
+ */
+[_RAISE] = {
+  {KC_GRV,  KC_1,    KC_2,    KC_3,    KC_4,    KC_5,    KC_6,    KC_7,    KC_8,    KC_9,    KC_0,    KC_BSPC},
+  {KC_DEL,  KC_F1,   KC_F2,   KC_F3,   KC_F4,   KC_F5,   KC_F6,   KC_MINS, KC_EQL,  KC_LBRC, KC_RBRC, KC_BSLS},
+  {_______, KC_F7,   KC_F8,   KC_F9,   KC_F10,  KC_F11,  KC_F12,  KC_NUHS, KC_NUBS, KC_PGUP, KC_PGDN, _______},
+  {_______, _______, _______, _______, _______, _______, _______, _______, KC_MNXT, KC_VOLD, KC_VOLU, KC_MPLY}
+},
+
+/* Plover layer (http://opensteno.org)
+ * ,-----------------------------------------------------------------------------------.
+ * |   #  |   #  |   #  |   #  |   #  |   #  |   #  |   #  |   #  |   #  |   #  |   #  |
+ * |------+------+------+------+------+-------------+------+------+------+------+------|
+ * |      |   S  |   T  |   P  |   H  |   *  |   *  |   F  |   P  |   L  |   T  |   D  |
+ * |------+------+------+------+------+------|------+------+------+------+------+------|
+ * |      |   S  |   K  |   W  |   R  |   *  |   *  |   R  |   B  |   G  |   S  |   Z  |
+ * |------+------+------+------+------+------+------+------+------+------+------+------|
+ * | Exit |      |      |   A  |   O  |             |   E  |   U  |      |      |      |
+ * `-----------------------------------------------------------------------------------'
+ */
+
+[_PLOVER] = {
+  {KC_1,    KC_1,    KC_1,    KC_1,    KC_1,    KC_1,    KC_1,    KC_1,    KC_1,    KC_1,    KC_1,    KC_1   },
+  {XXXXXXX, KC_Q,    KC_W,    KC_E,    KC_R,    KC_T,    KC_Y,    KC_U,    KC_I,    KC_O,    KC_P,    KC_LBRC},
+  {XXXXXXX, KC_A,    KC_S,    KC_D,    KC_F,    KC_G,    KC_H,    KC_J,    KC_K,    KC_L,    KC_SCLN, KC_QUOT},
+  {EXT_PLV, XXXXXXX, XXXXXXX, KC_C,    KC_V,    XXXXXXX, XXXXXXX, KC_N,    KC_M,    XXXXXXX, XXXXXXX, XXXXXXX}
+},
+
+/* Adjust (Lower + Raise)
+ * ,-----------------------------------------------------------------------------------.
+ * |      | Reset|      |      |      |      |      |      |      |      |      |  Del |
+ * |------+------+------+------+------+-------------+------+------+------+------+------|
+ * |      |      |      |Aud on|Audoff|AGnorm|AGswap|Qwerty|Colemk|Dvorak|Plover|      |
+ * |------+------+------+------+------+------|------+------+------+------+------+------|
+ * |      |Voice-|Voice+|Mus on|Musoff|MIDIon|MIDIof|      |      |      |      |      |
+ * |------+------+------+------+------+------+------+------+------+------+------+------|
+ * |      |      |      |      |      |             |      |      |      |      |      |
+ * `-----------------------------------------------------------------------------------'
+ */
+[_ADJUST] = {
+  {_______, RESET,   DEBUG,    RGB_TOG, RGB_MOD, RGB_HUI, RGB_HUD, RGB_SAI, RGB_SAD, RGB_VAI, RGB_VAD, KC_DEL },
+  {_______, _______, MU_MOD,  AU_ON,   AU_OFF,  AG_NORM, AG_SWAP, QWERTY,  COLEMAK, DVORAK,  PLOVER,  _______},
+  {_______, MUV_DE,  MUV_IN,  MU_ON,   MU_OFF,  MI_ON,   MI_OFF,  TERM_ON, TERM_OFF, _______, _______, _______},
+  {_______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______}
+}
+
+
+};
+
+#ifdef AUDIO_ENABLE
+  float plover_song[][2]     = SONG(PLOVER_SOUND);
+  float plover_gb_song[][2]  = SONG(PLOVER_GOODBYE_SOUND);
+#endif
+
+bool process_record_user(uint16_t keycode, keyrecord_t *record) {
+  switch (keycode) {
+    case QWERTY:
+      if (record->event.pressed) {
+        print("mode just switched to qwerty and this is a huge string\n");
+        set_single_persistent_default_layer(_QWERTY);
+      }
+      return false;
+      break;
+    case COLEMAK:
+      if (record->event.pressed) {
+        set_single_persistent_default_layer(_COLEMAK);
+      }
+      return false;
+      break;
+    case DVORAK:
+      if (record->event.pressed) {
+        set_single_persistent_default_layer(_DVORAK);
+      }
+      return false;
+      break;
+    case LOWER:
+      if (record->event.pressed) {
+        layer_on(_LOWER);
+        update_tri_layer(_LOWER, _RAISE, _ADJUST);
+      } else {
+        layer_off(_LOWER);
+        update_tri_layer(_LOWER, _RAISE, _ADJUST);
+      }
+      return false;
+      break;
+    case RAISE:
+      if (record->event.pressed) {
+        layer_on(_RAISE);
+        update_tri_layer(_LOWER, _RAISE, _ADJUST);
+      } else {
+        layer_off(_RAISE);
+        update_tri_layer(_LOWER, _RAISE, _ADJUST);
+      }
+      return false;
+      break;
+    case BACKLIT:
+      if (record->event.pressed) {
+        register_code(KC_RSFT);
+        #ifdef BACKLIGHT_ENABLE
+          backlight_step();
+        #endif
+        PORTE &= ~(1<<6);
+      } else {
+        unregister_code(KC_RSFT);
+        PORTE |= (1<<6);
+      }
+      return false;
+      break;
+    case PLOVER:
+      if (record->event.pressed) {
+        #ifdef AUDIO_ENABLE
+          stop_all_notes();
+          PLAY_SONG(plover_song);
+        #endif
+        layer_off(_RAISE);
+        layer_off(_LOWER);
+        layer_off(_ADJUST);
+        layer_on(_PLOVER);
+        if (!eeconfig_is_enabled()) {
+            eeconfig_init();
+        }
+        keymap_config.raw = eeconfig_read_keymap();
+        keymap_config.nkro = 1;
+        eeconfig_update_keymap(keymap_config.raw);
+      }
+      return false;
+      break;
+    case EXT_PLV:
+      if (record->event.pressed) {
+        #ifdef AUDIO_ENABLE
+          PLAY_SONG(plover_gb_song);
+        #endif
+        layer_off(_PLOVER);
+      }
+      return false;
+      break;
+  }
+  return true;
+}

keyboards/planck/keymaps/audio_out/rules.mk

@@ -0,0 +1,3 @@
+AUDIO_ENABLE = yes
+BACKLIGHT_ENABLE = no
+MIDI_ENABLE = no

keyboards/planck/rules.mk

@@ -65,7 +65,7 @@ CONSOLE_ENABLE = yes         # Console for debug(+400)
 COMMAND_ENABLE = no        # Commands for debug and configuration
 NKRO_ENABLE = yes            # Nkey Rollover - if this doesn't work, see here: https://github.com/tmk/tmk_keyboard/wiki/FAQ#nkro-doesnt-work
 BACKLIGHT_ENABLE = no      # Enable keyboard backlight functionality
-MIDI_ENABLE = yes            # MIDI controls
+MIDI_ENABLE = no            # MIDI controls
 AUDIO_ENABLE = yes           # Audio output on port C6
 UNICODE_ENABLE = no         # Unicode
 BLUETOOTH_ENABLE = no       # Enable Bluetooth with the Adafruit EZ-Key HID

quantum/audio/audio.c

@@ -47,6 +47,16 @@
     #define DISABLE_AUDIO_COUNTER_1_ISR TIMSK1 &= ~_BV(OCIE1A)
 #endif
 
+#ifdef B6_AUDIO
+    #define ENABLE_AUDIO_COUNTER_1_ISR TIMSK1 |= _BV(OCIE1B)
+    #define DISABLE_AUDIO_COUNTER_1_ISR TIMSK1 &= ~_BV(OCIE1B)
+#endif
+
+#ifdef B7_AUDIO
+    #define ENABLE_AUDIO_COUNTER_1_ISR TIMSK1 |= _BV(OCIE1C)
+    #define DISABLE_AUDIO_COUNTER_1_ISR TIMSK1 &= ~_BV(OCIE1C)
+#endif
+
 // TCCR3A: Timer/Counter #3 Control Register
 // Compare Output Mode (COM3An) = 0b00 = Normal port operation, OC3A disconnected from PC6
 
@@ -60,6 +70,16 @@
     #define DISABLE_AUDIO_COUNTER_1_OUTPUT TCCR1A &= ~(_BV(COM1A1) | _BV(COM1A0));
 #endif
 
+#ifdef B6_AUDIO
+    #define ENABLE_AUDIO_COUNTER_1_OUTPUT TCCR1A |= _BV(COM1B1);
+    #define DISABLE_AUDIO_COUNTER_1_OUTPUT TCCR1A &= ~(_BV(COM1B1) | _BV(COM1B0));
+#endif
+
+#ifdef B7_AUDIO
+    #define ENABLE_AUDIO_COUNTER_1_OUTPUT TCCR1A |= _BV(COM1C1);
+    #define DISABLE_AUDIO_COUNTER_1_OUTPUT TCCR1A &= ~(_BV(COM1C1) | _BV(COM1C0));
+#endif
+
 // Fast PWM Mode Controls
 
 #ifdef C6_AUDIO
@@ -72,6 +92,16 @@
     #define TIMER_1_DUTY_CYCLE OCR1A
 #endif
 
+#ifdef B6_AUDIO
+    #define TIMER_1_PERIOD     ICR1
+    #define TIMER_1_DUTY_CYCLE OCR1B
+#endif
+
+#ifdef B7_AUDIO
+    #define TIMER_1_PERIOD     ICR1
+    #define TIMER_1_DUTY_CYCLE OCR1C
+#endif
+
 
 // -----------------------------------------------------------------------------
 
@@ -97,7 +127,7 @@ bool     playing_note = false;
 float    note_frequency = 0;
 float    note_length = 0;
 uint8_t  note_tempo = TEMPO_DEFAULT;
-float    note_timbre = TIMBRE_DEFAULT;
+float    note_timbre[NUMBER_OF_TIMERS] = {TIMBRE_DEFAULT};
 uint16_t note_position = 0;
 float (* notes_pointer)[][2];
 uint16_t notes_count;
@@ -119,8 +149,8 @@ static bool audio_initialized = false;
 
 audio_config_t audio_config;
 
-uint16_t envelope_index = 0;
-bool glissando = true;
+uint16_t envelope_index[NUMBER_OF_TIMERS] = {0};
+bool glissando[NUMBER_OF_TIMERS] = {true};
 
 #ifndef STARTUP_SONG
     #define STARTUP_SONG SONG(STARTUP_SOUND)
@@ -163,11 +193,25 @@ void audio_init()
         //    PORTB &= ~_BV(PORTB5);
         #endif
 
+        #ifdef B6_AUDIO
+            DDRB |= _BV(PORTB6);
+        // #else
+        //     DDRB |= _BV(PORTB6);
+        //     PORTB &= ~_BV(PORTB6);
+        #endif
+
+        #ifdef B7_AUDIO
+            DDRB |= _BV(PORTB7);
+        // #else
+        //     DDRB |= _BV(PORTB7);
+        //     PORTB &= ~_BV(PORTB7);
+        #endif
+
         #ifdef C6_AUDIO
             DISABLE_AUDIO_COUNTER_3_ISR;
         #endif
         
-        #ifdef B5_AUDIO
+        #ifdef B_AUDIO
             DISABLE_AUDIO_COUNTER_1_ISR;
         #endif
 
@@ -179,14 +223,17 @@ void audio_init()
         #ifdef C6_AUDIO
             TCCR3A = (0 << COM3A1) | (0 << COM3A0) | (1 << WGM31) | (0 << WGM30);
             TCCR3B = (1 << WGM33)  | (1 << WGM32)  | (0 << CS32)  | (1 << CS31) | (0 << CS30);
+
+            TIMER_3_PERIOD = (uint16_t)(((float)F_CPU) / (440 * CPU_PRESCALER));
+            TIMER_3_DUTY_CYCLE = (uint16_t)((((float)F_CPU) / (440 * CPU_PRESCALER)) * note_timbre[TIMER_3_INDEX]);
         #endif
 
-        #ifdef B5_AUDIO
+        #ifdef B_AUDIO
             TCCR1A = (0 << COM1A1) | (0 << COM1A0) | (1 << WGM11) | (0 << WGM10);
             TCCR1B = (1 << WGM13)  | (1 << WGM12)  | (0 << CS12)  | (1 << CS11) | (0 << CS10);
 
             TIMER_1_PERIOD = (uint16_t)(((float)F_CPU) / (440 * CPU_PRESCALER));
-            TIMER_1_DUTY_CYCLE = (uint16_t)((((float)F_CPU) / (440 * CPU_PRESCALER)) * note_timbre);
+            TIMER_1_DUTY_CYCLE = (uint16_t)((((float)F_CPU) / (440 * CPU_PRESCALER)) * note_timbre[TIMER_1_INDEX]);
         #endif
 
         audio_initialized = true;
@@ -213,7 +260,7 @@ void stop_all_notes()
         DISABLE_AUDIO_COUNTER_3_OUTPUT;
     #endif
 
-    #ifdef B5_AUDIO
+    #ifdef B_AUDIO
         DISABLE_AUDIO_COUNTER_1_ISR;
         DISABLE_AUDIO_COUNTER_1_OUTPUT;
     #endif
@@ -258,12 +305,18 @@ void stop_note(float freq)
         if (voice_place >= voices) {
             voice_place = 0;
         }
+        if (voices == 1) {
+            #if defined(C6_AUDIO) && defined(B_AUDIO)
+                DISABLE_AUDIO_COUNTER_1_ISR;
+                DISABLE_AUDIO_COUNTER_1_OUTPUT;
+            #endif
+        }
         if (voices == 0) {
             #ifdef C6_AUDIO
                 DISABLE_AUDIO_COUNTER_3_ISR;
                 DISABLE_AUDIO_COUNTER_3_OUTPUT;
             #endif
-            #ifdef B5_AUDIO
+            #ifdef B_AUDIO
                 DISABLE_AUDIO_COUNTER_1_ISR;
                 DISABLE_AUDIO_COUNTER_1_OUTPUT;
             #endif
@@ -303,11 +356,11 @@ ISR(TIMER3_COMPA_vect)
     if (playing_note) {
         if (voices > 0) {
 
-            #ifdef B5_AUDIO
+            #ifdef B_AUDIO
             float freq_alt = 0;
                 if (voices > 1) {
                     if (polyphony_rate == 0) {
-                        if (glissando) {
+                        if (glissando[TIMER_1_INDEX] && NUMBER_OF_TIMERS == 1) {
                             if (frequency_alt != 0 && frequency_alt < frequencies[voices - 2] && frequency_alt < frequencies[voices - 2] * pow(2, -440/frequencies[voices - 2]/12/2)) {
                                 frequency_alt = frequency_alt * pow(2, 440/frequency_alt/12/2);
                             } else if (frequency_alt != 0 && frequency_alt > frequencies[voices - 2] && frequency_alt > frequencies[voices - 2] * pow(2, 440/frequencies[voices - 2]/12/2)) {
@@ -330,18 +383,18 @@ ISR(TIMER3_COMPA_vect)
                         #endif
                     }
 
-                    if (envelope_index < 65535) {
-                        envelope_index++;
+                    if (envelope_index[TIMER_1_INDEX] < 65535) {
+                        envelope_index[TIMER_1_INDEX]++;
                     }
 
-                    freq_alt = voice_envelope(freq_alt);
+                    freq_alt = voice_envelope(freq_alt,TIMER_1_INDEX);
 
                     if (freq_alt < 30.517578125) {
                         freq_alt = 30.52;
                     }
 
                     TIMER_1_PERIOD = (uint16_t)(((float)F_CPU) / (freq_alt * CPU_PRESCALER));
-                    TIMER_1_DUTY_CYCLE = (uint16_t)((((float)F_CPU) / (freq_alt * CPU_PRESCALER)) * note_timbre);
+                    TIMER_1_DUTY_CYCLE = (uint16_t)((((float)F_CPU) / (freq_alt * CPU_PRESCALER)) * note_timbre[TIMER_1_INDEX]);
                 }
             #endif
 
@@ -364,7 +417,7 @@ ISR(TIMER3_COMPA_vect)
                     freq = frequencies[voice_place];
                 #endif
             } else {
-                if (glissando) {
+                if (glissando[TIMER_3_INDEX] && NUMBER_OF_TIMERS == 1) {
                     if (frequency != 0 && frequency < frequencies[voices - 1] && frequency < frequencies[voices - 1] * pow(2, -440/frequencies[voices - 1]/12/2)) {
                         frequency = frequency * pow(2, 440/frequency/12/2);
                     } else if (frequency != 0 && frequency > frequencies[voices - 1] && frequency > frequencies[voices - 1] * pow(2, 440/frequencies[voices - 1]/12/2)) {
@@ -387,18 +440,18 @@ ISR(TIMER3_COMPA_vect)
                 #endif
             }
 
-            if (envelope_index < 65535) {
-                envelope_index++;
+            if (envelope_index[TIMER_3_INDEX] < 65535) {
+                envelope_index[TIMER_3_INDEX]++;
             }
 
-            freq = voice_envelope(freq);
+            freq = voice_envelope(freq, TIMER_3_INDEX);
 
             if (freq < 30.517578125) {
                 freq = 30.52;
             }
 
             TIMER_3_PERIOD = (uint16_t)(((float)F_CPU) / (freq * CPU_PRESCALER));
-            TIMER_3_DUTY_CYCLE = (uint16_t)((((float)F_CPU) / (freq * CPU_PRESCALER)) * note_timbre);
+            TIMER_3_DUTY_CYCLE = (uint16_t)((((float)F_CPU) / (freq * CPU_PRESCALER)) * note_timbre[TIMER_3_INDEX]);
         }
     }
 
@@ -414,13 +467,13 @@ ISR(TIMER3_COMPA_vect)
                     freq = note_frequency;
             #endif
 
-            if (envelope_index < 65535) {
-                envelope_index++;
+            if (envelope_index[TIMER_3_INDEX] < 65535) {
+                envelope_index[TIMER_3_INDEX]++;
             }
-            freq = voice_envelope(freq);
+            freq = voice_envelope(freq, TIMER_3_INDEX);
 
             TIMER_3_PERIOD = (uint16_t)(((float)F_CPU) / (freq * CPU_PRESCALER));
-            TIMER_3_DUTY_CYCLE = (uint16_t)((((float)F_CPU) / (freq * CPU_PRESCALER)) * note_timbre);
+            TIMER_3_DUTY_CYCLE = (uint16_t)((((float)F_CPU) / (freq * CPU_PRESCALER)) * note_timbre[TIMER_3_INDEX]);
         } else {
             TIMER_3_PERIOD = 0;
             TIMER_3_DUTY_CYCLE = 0;
@@ -461,7 +514,7 @@ ISR(TIMER3_COMPA_vect)
                 }
             } else {
                 note_resting = false;
-                envelope_index = 0;
+                envelope_index[TIMER_3_INDEX] = 0;
                 note_frequency = (*notes_pointer)[current_note][0];
                 note_length = ((*notes_pointer)[current_note][1] / 4) * (((float)note_tempo) / 100);
             }
@@ -477,10 +530,16 @@ ISR(TIMER3_COMPA_vect)
 }
 #endif
 
+#ifdef B_AUDIO
 #ifdef B5_AUDIO
 ISR(TIMER1_COMPA_vect)
+#elif defined(B6_AUDIO)
+ISR(TIMER1_COMPB_vect)
+#elif defined(B7_AUDIO)
+ISR(TIMER1_COMPC_vect)
+#endif
 {
-    #if defined(B5_AUDIO) && !defined(C6_AUDIO)
+    #if defined(B_AUDIO) && !defined(C6_AUDIO)
     float freq = 0;
 
     if (playing_note) {
@@ -504,7 +563,7 @@ ISR(TIMER1_COMPA_vect)
                     freq = frequencies[voice_place];
                 #endif
             } else {
-                if (glissando) {
+                if (glissando[TIMER_1_INDEX] && NUMBER_OF_TIMERS == 1) {
                     if (frequency != 0 && frequency < frequencies[voices - 1] && frequency < frequencies[voices - 1] * pow(2, -440/frequencies[voices - 1]/12/2)) {
                         frequency = frequency * pow(2, 440/frequency/12/2);
                     } else if (frequency != 0 && frequency > frequencies[voices - 1] && frequency > frequencies[voices - 1] * pow(2, 440/frequencies[voices - 1]/12/2)) {
@@ -527,18 +586,18 @@ ISR(TIMER1_COMPA_vect)
                 #endif
             }
 
-            if (envelope_index < 65535) {
-                envelope_index++;
+            if (envelope_index[TIMER_1_INDEX] < 65535) {
+                envelope_index[TIMER_1_INDEX]++;
             }
 
-            freq = voice_envelope(freq);
+            freq = voice_envelope(freq, TIMER_1_INDEX);
 
             if (freq < 30.517578125) {
                 freq = 30.52;
             }
 
             TIMER_1_PERIOD = (uint16_t)(((float)F_CPU) / (freq * CPU_PRESCALER));
-            TIMER_1_DUTY_CYCLE = (uint16_t)((((float)F_CPU) / (freq * CPU_PRESCALER)) * note_timbre);
+            TIMER_1_DUTY_CYCLE = (uint16_t)((((float)F_CPU) / (freq * CPU_PRESCALER)) * note_timbre[TIMER_1_INDEX]);
         }
     }
 
@@ -554,13 +613,13 @@ ISR(TIMER1_COMPA_vect)
                     freq = note_frequency;
             #endif
 
-            if (envelope_index < 65535) {
-                envelope_index++;
+            if (envelope_index[TIMER_1_INDEX] < 65535) {
+                envelope_index[TIMER_1_INDEX]++;
             }
-            freq = voice_envelope(freq);
+            freq = voice_envelope(freq, TIMER_1_INDEX);
 
             TIMER_1_PERIOD = (uint16_t)(((float)F_CPU) / (freq * CPU_PRESCALER));
-            TIMER_1_DUTY_CYCLE = (uint16_t)((((float)F_CPU) / (freq * CPU_PRESCALER)) * note_timbre);
+            TIMER_1_DUTY_CYCLE = (uint16_t)((((float)F_CPU) / (freq * CPU_PRESCALER)) * note_timbre[TIMER_1_INDEX]);
         } else {
             TIMER_1_PERIOD = 0;
             TIMER_1_DUTY_CYCLE = 0;
@@ -601,7 +660,7 @@ ISR(TIMER1_COMPA_vect)
                 }
             } else {
                 note_resting = false;
-                envelope_index = 0;
+                envelope_index[TIMER_1_INDEX] = 0;
                 note_frequency = (*notes_pointer)[current_note][0];
                 note_length = ((*notes_pointer)[current_note][1] / 4) * (((float)note_tempo) / 100);
             }
@@ -630,7 +689,7 @@ void play_note(float freq, int vol) {
         #ifdef C6_AUDIO
             DISABLE_AUDIO_COUNTER_3_ISR;
         #endif
-        #ifdef B5_AUDIO
+        #ifdef B_AUDIO
             DISABLE_AUDIO_COUNTER_1_ISR;
         #endif
 
@@ -640,7 +699,6 @@ void play_note(float freq, int vol) {
 
         playing_note = true;
 
-        envelope_index = 0;
 
         if (freq > 0) {
             frequencies[voices] = freq;
@@ -652,16 +710,23 @@ void play_note(float freq, int vol) {
             ENABLE_AUDIO_COUNTER_3_ISR;
             ENABLE_AUDIO_COUNTER_3_OUTPUT;
         #endif
-        #ifdef B5_AUDIO
+
+        #ifdef B_AUDIO
             #ifdef C6_AUDIO
             if (voices > 1) {
+                envelope_index[TIMER_3_INDEX] = 0;
                 ENABLE_AUDIO_COUNTER_1_ISR;
                 ENABLE_AUDIO_COUNTER_1_OUTPUT;
+            } else {
+                envelope_index[TIMER_3_INDEX] = 0;
             }
             #else
+            envelope_index[TIMER_1_INDEX] = 0;
             ENABLE_AUDIO_COUNTER_1_ISR;
             ENABLE_AUDIO_COUNTER_1_OUTPUT;
             #endif
+        #else
+            envelope_index[TIMER_3_INDEX] = 0;
         #endif
     }
 
@@ -679,7 +744,7 @@ void play_notes(float (*np)[][2], uint16_t n_count, bool n_repeat)
         #ifdef C6_AUDIO
             DISABLE_AUDIO_COUNTER_3_ISR;
         #endif
-        #ifdef B5_AUDIO
+        #ifdef B_AUDIO
             DISABLE_AUDIO_COUNTER_1_ISR;
         #endif
 
@@ -705,7 +770,7 @@ void play_notes(float (*np)[][2], uint16_t n_count, bool n_repeat)
             ENABLE_AUDIO_COUNTER_3_ISR;
             ENABLE_AUDIO_COUNTER_3_OUTPUT;
         #endif
-        #ifdef B5_AUDIO
+        #ifdef B_AUDIO
             #ifndef C6_AUDIO
             ENABLE_AUDIO_COUNTER_1_ISR;
             ENABLE_AUDIO_COUNTER_1_OUTPUT;
@@ -803,8 +868,8 @@ void decrease_polyphony_rate(float change) {
 
 // Timbre function
 
-void set_timbre(float timbre) {
-    note_timbre = timbre;
+void set_timbre(float timbre, uint8_t timer_index) {
+    note_timbre[timer_index] = timbre;
 }
 
 // Tempo functions

quantum/audio/audio.h

@@ -36,6 +36,42 @@
 // Enable vibrato strength/amplitude - slows down ISR too much
 // #define VIBRATO_STRENGTH_ENABLE
 
+#if defined(__AVR__)
+
+// avr
+
+#ifdef B_AUDIO
+#error Please define B5_AUDIO, B6_AUDIO, or B7_AUDIO instead
+#endif
+
+#if defined(B5_AUDIO) || defined(B6_AUDIO) || defined(B7_AUDIO)
+    #define B_AUDIO
+#endif
+
+#if defined(C6_AUDIO) && defined (B_AUDIO)
+  #define NUMBER_OF_TIMERS 2
+#elif defined(C6_AUDIO)
+  #define NUMBER_OF_TIMERS 1
+#elif defined(B_AUDIO)
+  #define NUMBER_OF_TIMERS 1
+#else
+  #define NUMBER_OF_TIMERS 0
+#endif
+
+#define TIMER_1_INDEX 0
+#define TIMER_3_INDEX 1 
+
+#else
+
+// chibios
+
+#define NUMBER_OF_TIMERS 2
+
+#define TIMER_6_INDEX 0
+#define TIMER_7_INDEX 1 
+
+#endif
+
 typedef union {
     uint8_t raw;
     struct {
@@ -75,7 +111,7 @@ void disable_polyphony(void);
 void increase_polyphony_rate(float change);
 void decrease_polyphony_rate(float change);
 
-void set_timbre(float timbre);
+void set_timbre(float timbre, uint8_t timer_index);
 void set_tempo(uint8_t tempo);
 
 void increase_tempo(uint8_t tempo_change);

quantum/audio/audio_arm.c

@@ -47,7 +47,7 @@ bool     playing_note = false;
 float    note_frequency = 0;
 float    note_length = 0;
 uint8_t  note_tempo = TEMPO_DEFAULT;
-float    note_timbre = TIMBRE_DEFAULT;
+float    note_timbre[NUMBER_OF_TIMERS] = {TIMBRE_DEFAULT};
 uint16_t note_position = 0;
 float (* notes_pointer)[][2];
 uint16_t notes_count;
@@ -69,31 +69,56 @@ static bool audio_initialized = false;
 
 audio_config_t audio_config;
 
-uint16_t envelope_index = 0;
-bool glissando = true;
+uint16_t envelope_index[NUMBER_OF_TIMERS] = {0};
+bool glissando[NUMBER_OF_TIMERS] = {true};
 
 #ifndef STARTUP_SONG
     #define STARTUP_SONG SONG(STARTUP_SOUND)
 #endif
 float startup_song[][2] = STARTUP_SONG;
 
-static void gpt_cb6(GPTDriver *gptp);
-static void gpt_cb7(GPTDriver *gptp);
 static void gpt_cb8(GPTDriver *gptp);
 
+#define DAC_BUFFER_SIZE 360
+
+#define START_CHANNEL_1() gptStart(&GPTD6, &gpt6cfg1); \
+    gptStartContinuous(&GPTD6, 2U)
+#define START_CHANNEL_2() gptStart(&GPTD7, &gpt7cfg1); \
+    gptStartContinuous(&GPTD7, 2U)
+#define STOP_CHANNEL_1() gptStopTimer(&GPTD6)
+#define STOP_CHANNEL_2() gptStopTimer(&GPTD7)
+#define RESTART_CHANNEL_1() STOP_CHANNEL_1(); \
+    START_CHANNEL_1()
+#define RESTART_CHANNEL_2() STOP_CHANNEL_1(); \
+    START_CHANNEL_1()
+#define UPDATE_CHANNEL_1_FREQ(freq) gpt6cfg1.frequency = freq * DAC_BUFFER_SIZE; \
+    RESTART_CHANNEL_1()
+#define UPDATE_CHANNEL_2_FREQ(freq) gpt7cfg1.frequency = freq * DAC_BUFFER_SIZE; \
+    RESTART_CHANNEL_2()
+#define GET_CHANNEL_1_FREQ gpt6cfg1.frequency
+#define GET_CHANNEL_2_FREQ gpt7cfg1.frequency
+
+
 /*
  * GPT6 configuration.
  */
+// static const GPTConfig gpt6cfg1 = {
+//   .frequency    = 1000000U,
+//   .callback     = NULL,
+//   .cr2          = TIM_CR2_MMS_1,    /* MMS = 010 = TRGO on Update Event.    */
+//   .dier         = 0U
+// };
+
 GPTConfig gpt6cfg1 = {
-  .frequency    = 440,
-  .callback     = gpt_cb6,
+  .frequency    = 440U*DAC_BUFFER_SIZE,
+  .callback     = NULL,
   .cr2          = TIM_CR2_MMS_1,    /* MMS = 010 = TRGO on Update Event.    */
   .dier         = 0U
 };
 
 GPTConfig gpt7cfg1 = {
-  .frequency    = 440,
-  .callback     = gpt_cb7,
+  .frequency    = 440U*DAC_BUFFER_SIZE,
+  .callback     = NULL,
   .cr2          = TIM_CR2_MMS_1,    /* MMS = 010 = TRGO on Update Event.    */
   .dier         = 0U
 };
@@ -105,15 +130,122 @@ GPTConfig gpt8cfg1 = {
   .dier         = 0U
 };
 
-static void gpt_cb6(GPTDriver *gptp) {
-    palTogglePad(GPIOA, 4);
+
+/*
+ * DAC test buffer (sine wave).
+ */
+// static const dacsample_t dac_buffer[DAC_BUFFER_SIZE] = {
+//   2047, 2082, 2118, 2154, 2189, 2225, 2260, 2296, 2331, 2367, 2402, 2437,
+//   2472, 2507, 2542, 2576, 2611, 2645, 2679, 2713, 2747, 2780, 2813, 2846,
+//   2879, 2912, 2944, 2976, 3008, 3039, 3070, 3101, 3131, 3161, 3191, 3221,
+//   3250, 3278, 3307, 3335, 3362, 3389, 3416, 3443, 3468, 3494, 3519, 3544,
+//   3568, 3591, 3615, 3637, 3660, 3681, 3703, 3723, 3744, 3763, 3782, 3801,
+//   3819, 3837, 3854, 3870, 3886, 3902, 3917, 3931, 3944, 3958, 3970, 3982,
+//   3993, 4004, 4014, 4024, 4033, 4041, 4049, 4056, 4062, 4068, 4074, 4078,
+//   4082, 4086, 4089, 4091, 4092, 4093, 4094, 4093, 4092, 4091, 4089, 4086,
+//   4082, 4078, 4074, 4068, 4062, 4056, 4049, 4041, 4033, 4024, 4014, 4004,
+//   3993, 3982, 3970, 3958, 3944, 3931, 3917, 3902, 3886, 3870, 3854, 3837,
+//   3819, 3801, 3782, 3763, 3744, 3723, 3703, 3681, 3660, 3637, 3615, 3591,
+//   3568, 3544, 3519, 3494, 3468, 3443, 3416, 3389, 3362, 3335, 3307, 3278,
+//   3250, 3221, 3191, 3161, 3131, 3101, 3070, 3039, 3008, 2976, 2944, 2912,
+//   2879, 2846, 2813, 2780, 2747, 2713, 2679, 2645, 2611, 2576, 2542, 2507,
+//   2472, 2437, 2402, 2367, 2331, 2296, 2260, 2225, 2189, 2154, 2118, 2082,
+//   2047, 2012, 1976, 1940, 1905, 1869, 1834, 1798, 1763, 1727, 1692, 1657,
+//   1622, 1587, 1552, 1518, 1483, 1449, 1415, 1381, 1347, 1314, 1281, 1248,
+//   1215, 1182, 1150, 1118, 1086, 1055, 1024,  993,  963,  933,  903,  873,
+//    844,  816,  787,  759,  732,  705,  678,  651,  626,  600,  575,  550,
+//    526,  503,  479,  457,  434,  413,  391,  371,  350,  331,  312,  293,
+//    275,  257,  240,  224,  208,  192,  177,  163,  150,  136,  124,  112,
+//    101,   90,   80,   70,   61,   53,   45,   38,   32,   26,   20,   16,
+//     12,    8,    5,    3,    2,    1,    0,    1,    2,    3,    5,    8,
+//     12,   16,   20,   26,   32,   38,   45,   53,   61,   70,   80,   90,
+//    101,  112,  124,  136,  150,  163,  177,  192,  208,  224,  240,  257,
+//    275,  293,  312,  331,  350,  371,  391,  413,  434,  457,  479,  503,
+//    526,  550,  575,  600,  626,  651,  678,  705,  732,  759,  787,  816,
+//    844,  873,  903,  933,  963,  993, 1024, 1055, 1086, 1118, 1150, 1182,
+//   1215, 1248, 1281, 1314, 1347, 1381, 1415, 1449, 1483, 1518, 1552, 1587,
+//   1622, 1657, 1692, 1727, 1763, 1798, 1834, 1869, 1905, 1940, 1976, 2012
+// };
+
+// squarewave
+static const dacsample_t dac_buffer[DAC_BUFFER_SIZE] = {
+  2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047,
+  2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047,
+  2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047,
+  2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047,
+  2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047,
+  2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047,
+  2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047,
+  2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047,
+  2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047,
+  2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047,
+  2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047,
+  2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047,
+  2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047,
+  2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047,
+  2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047,
+
+  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,  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
+};
+
+/*
+ * DAC streaming callback.
+ */
+size_t nx = 0, ny = 0, nz = 0;
+static void end_cb1(DACDriver *dacp, const dacsample_t *buffer, size_t n) {
+
+  (void)dacp;
+
+  nz++;
+  if (dac_buffer == buffer) {
+    nx += n;
+  }
+  else {
+    ny += n;
+  }
+
+  if ((nz % 1000) == 0) {
+    // palTogglePad(GPIOD, GPIOD_LED3);
+  }
 }
 
+/*
+ * DAC error callback.
+ */
+static void error_cb1(DACDriver *dacp, dacerror_t err) {
 
-static void gpt_cb7(GPTDriver *gptp) {
-    palTogglePad(GPIOA, 5);
+  (void)dacp;
+  (void)err;
+
+  chSysHalt("DAC failure");
 }
 
+static const DACConfig dac1cfg1 = {
+  .init         = 2047U,
+  .datamode     = DAC_DHRM_12BIT_RIGHT
+};
+
+static const DACConversionGroup dacgrpcfg1 = {
+  .num_channels = 1U,
+  .end_cb       = end_cb1,
+  .error_cb     = error_cb1,
+  .trigger      = DAC_TRG(0)
+};
+
 void audio_init()
 {
 
@@ -128,8 +260,27 @@ void audio_init()
     // audio_config.raw = eeconfig_read_audio();
     audio_config.enable = true;
 
-    palSetPadMode(GPIOA, 4, PAL_MODE_OUTPUT_PUSHPULL);
-    palSetPadMode(GPIOA, 5, PAL_MODE_OUTPUT_PUSHPULL);
+  /*
+   * Starting DAC1 driver, setting up the output pin as analog as suggested
+   * by the Reference Manual.
+   */
+  palSetPadMode(GPIOA, 4, PAL_MODE_INPUT_ANALOG);
+  palSetPadMode(GPIOA, 5, PAL_MODE_INPUT_ANALOG);
+  dacStart(&DACD1, &dac1cfg1);
+
+  /*
+   * Starting GPT6 driver, it is used for triggering the DAC.
+   */
+  START_CHANNEL_1();
+  START_CHANNEL_2();
+
+  /*
+   * Starting a continuous conversion.
+   */
+  dacStartConversion(&DACD1, &dacgrpcfg1,
+                     (dacsample_t *)dac_buffer, DAC_BUFFER_SIZE);
+  // gptStartContinuous(&GPTD6, 2U);
+
 
     audio_initialized = true;
 
@@ -193,8 +344,8 @@ void stop_note(float freq)
             voice_place = 0;
         }
         if (voices == 0) {
-            gptStopTimer(&GPTD6);
-            gptStopTimer(&GPTD7);
+            STOP_CHANNEL_1();
+            STOP_CHANNEL_2();
             gptStopTimer(&GPTD8);
             frequency = 0;
             frequency_alt = 0;
@@ -224,20 +375,6 @@ float vibrato(float average_freq) {
 
 #endif
 
-static void restart_gpt6(void) {
-    // gptStopTimer(&GPTD6);
-
-    gptStart(&GPTD6, &gpt6cfg1);
-    gptStartContinuous(&GPTD6, 2U);
-}
-
-static void restart_gpt7(void) {
-    // gptStopTimer(&GPTD7);
-
-    gptStart(&GPTD7, &gpt7cfg1);
-    gptStartContinuous(&GPTD7, 2U);
-}
-
 static void gpt_cb8(GPTDriver *gptp) {
     float freq;
 
@@ -247,7 +384,7 @@ static void gpt_cb8(GPTDriver *gptp) {
             float freq_alt = 0;
                 if (voices > 1) {
                     if (polyphony_rate == 0) {
-                        if (glissando) {
+                        if (glissando[TIMER_6_INDEX]) {
                             if (frequency_alt != 0 && frequency_alt < frequencies[voices - 2] && frequency_alt < frequencies[voices - 2] * pow(2, -440/frequencies[voices - 2]/12/2)) {
                                 frequency_alt = frequency_alt * pow(2, 440/frequency_alt/12/2);
                             } else if (frequency_alt != 0 && frequency_alt > frequencies[voices - 2] && frequency_alt > frequencies[voices - 2] * pow(2, 440/frequencies[voices - 2]/12/2)) {
@@ -270,23 +407,22 @@ static void gpt_cb8(GPTDriver *gptp) {
                         #endif
                     }
 
-                    if (envelope_index < 65535) {
-                        envelope_index++;
+                    if (envelope_index[TIMER_6_INDEX] < 65535) {
+                        envelope_index[TIMER_6_INDEX]++;
                     }
 
-                    freq_alt = voice_envelope(freq_alt);
+                    freq_alt = voice_envelope(freq_alt, TIMER_6_INDEX);
 
                     if (freq_alt < 30.517578125) {
                         freq_alt = 30.52;
                     }
 
-                    if (gpt6cfg1.frequency != (uint16_t)freq_alt) {
-                        gpt6cfg1.frequency = freq_alt;
-                        restart_gpt6();
+                    if (GET_CHANNEL_1_FREQ != (uint16_t)freq_alt) {
+                        UPDATE_CHANNEL_1_FREQ(freq_alt);
                     }
                     //note_timbre;
                 } else {
-                    // gptStopTimer(&GPTD6);
+                    STOP_CHANNEL_1();
                 }
 
             if (polyphony_rate > 0) {
@@ -308,7 +444,7 @@ static void gpt_cb8(GPTDriver *gptp) {
                     freq = frequencies[voice_place];
                 #endif
             } else {
-                if (glissando) {
+                if (glissando[TIMER_7_INDEX]) {
                     if (frequency != 0 && frequency < frequencies[voices - 1] && frequency < frequencies[voices - 1] * pow(2, -440/frequencies[voices - 1]/12/2)) {
                         frequency = frequency * pow(2, 440/frequency/12/2);
                     } else if (frequency != 0 && frequency > frequencies[voices - 1] && frequency > frequencies[voices - 1] * pow(2, 440/frequencies[voices - 1]/12/2)) {
@@ -331,20 +467,19 @@ static void gpt_cb8(GPTDriver *gptp) {
                 #endif
             }
 
-            if (envelope_index < 65535) {
-                envelope_index++;
+            if (envelope_index[TIMER_7_INDEX] < 65535) {
+                envelope_index[TIMER_7_INDEX]++;
             }
 
-            freq = voice_envelope(freq);
+            freq = voice_envelope(freq, TIMER_7_INDEX);
 
             if (freq < 30.517578125) {
                 freq = 30.52;
             }
 
 
-            if (gpt7cfg1.frequency != (uint16_t)freq) {
-                gpt7cfg1.frequency = freq;
-                restart_gpt7();
+            if (GET_CHANNEL_2_FREQ != (uint16_t)freq) {
+                UPDATE_CHANNEL_2_FREQ(freq);
             }
             //note_timbre;
         } else {
@@ -364,17 +499,15 @@ static void gpt_cb8(GPTDriver *gptp) {
                     freq = note_frequency;
             #endif
 
-            if (envelope_index < 65535) {
-                envelope_index++;
+            if (envelope_index[TIMER_6_INDEX] < 65535) {
+                envelope_index[TIMER_6_INDEX]++;
             }
-            freq = voice_envelope(freq);
+            freq = voice_envelope(freq, TIMER_6_INDEX);
 
 
-            if (gpt6cfg1.frequency != (uint16_t)freq) {
-                gpt6cfg1.frequency = freq;
-                restart_gpt6();
-                gpt7cfg1.frequency = freq;
-                restart_gpt7();
+            if (GET_CHANNEL_1_FREQ != (uint16_t)freq) {
+                UPDATE_CHANNEL_1_FREQ(freq);
+                UPDATE_CHANNEL_2_FREQ(freq);
             }
             //note_timbre;
         } else {
@@ -384,7 +517,7 @@ static void gpt_cb8(GPTDriver *gptp) {
 
         note_position++;
         bool end_of_note = false;
-        if (gpt6cfg1.frequency > 0) {
+        if (GET_CHANNEL_1_FREQ > 0) {
             if (!note_resting) 
                 end_of_note = (note_position >= (note_length*16 - 1));
             else
@@ -399,8 +532,8 @@ static void gpt_cb8(GPTDriver *gptp) {
                 if (notes_repeat) {
                     current_note = 0;
                 } else {
-                    gptStopTimer(&GPTD6);
-                    gptStopTimer(&GPTD7);
+                    STOP_CHANNEL_1();
+                    STOP_CHANNEL_2();
                     // gptStopTimer(&GPTD8);
                     playing_notes = false;
                     return;
@@ -418,7 +551,7 @@ static void gpt_cb8(GPTDriver *gptp) {
                 }
             } else {
                 note_resting = false;
-                envelope_index = 0;
+                envelope_index[TIMER_6_INDEX] = 0;
                 note_frequency = (*notes_pointer)[current_note][0];
                 note_length = ((*notes_pointer)[current_note][1] / 4) * (((float)note_tempo) / 100);
             }
@@ -449,7 +582,8 @@ void play_note(float freq, int vol) {
 
         playing_note = true;
 
-        envelope_index = 0;
+        envelope_index[TIMER_6_INDEX] = 0;
+        envelope_index[TIMER_7_INDEX] = 0;
 
         if (freq > 0) {
             frequencies[voices] = freq;
@@ -492,8 +626,8 @@ void play_notes(float (*np)[][2], uint16_t n_count, bool n_repeat)
 
         gptStart(&GPTD8, &gpt8cfg1);
         gptStartContinuous(&GPTD8, 2U);
-        restart_gpt6();
-        restart_gpt7();
+        RESTART_CHANNEL_1();
+        RESTART_CHANNEL_2();
     }
 
 }
@@ -582,8 +716,8 @@ void decrease_polyphony_rate(float change) {
 
 // Timbre function
 
-void set_timbre(float timbre) {
-    note_timbre = timbre;
+void set_timbre(float timbre, uint8_t timer_index) {
+    note_timbre[timer_index] = timbre;
 }
 
 // Tempo functions

quantum/audio/voices.c

@@ -18,73 +18,91 @@
 #include "stdlib.h"
 
 // these are imported from audio.c
-extern uint16_t envelope_index;
-extern float note_timbre;
+extern uint16_t envelope_index[NUMBER_OF_TIMERS];
+extern float note_timbre[NUMBER_OF_TIMERS];
 extern float polyphony_rate;
-extern bool glissando;
+extern bool glissando[NUMBER_OF_TIMERS];
 
-voice_type voice = default_voice;
+voice_type voice[NUMBER_OF_TIMERS] = {default_voice};
 
-void set_voice(voice_type v) {
-    voice = v;
+void set_all_voices(voice_type v) {
+    for (uint8_t i = 0; i < NUMBER_OF_TIMERS; i++) {
+        voice[i] = v;
+    }
+}
+
+void all_voices_iterate(void) {
+    for (uint8_t i = 0; i < NUMBER_OF_TIMERS; i++) {
+        voice[i] = (voice[i] + 1) % number_of_voices;
+    }
+}
+
+void all_voices_deiterate(void) {
+    for (uint8_t i = 0; i < NUMBER_OF_TIMERS; i++) {
+        voice[i] = (voice[i] - 1 + number_of_voices) % number_of_voices;
+    }
+}
+
+void set_voice(voice_type v, uint8_t timer_index) {
+    voice[timer_index] = v;
 }
 
-void voice_iterate() {
-    voice = (voice + 1) % number_of_voices;
+void voice_iterate(uint8_t timer_index) {
+    voice[timer_index] = (voice[timer_index] + 1) % number_of_voices;
 }
 
-void voice_deiterate() {
-    voice = (voice - 1 + number_of_voices) % number_of_voices;
+void voice_deiterate(uint8_t timer_index) {
+    voice[timer_index] = (voice[timer_index] - 1 + number_of_voices) % number_of_voices;
 }
 
-float voice_envelope(float frequency) {
-    // envelope_index ranges from 0 to 0xFFFF, which is preserved at 880.0 Hz
+float voice_envelope(float frequency, uint8_t timer_index) {
+    // envelope_index[timer_index] ranges from 0 to 0xFFFF, which is preserved at 880.0 Hz
     __attribute__ ((unused))
-    uint16_t compensated_index = (uint16_t)((float)envelope_index * (880.0 / frequency));
+    uint16_t compensated_index = (uint16_t)((float)envelope_index[timer_index] * (880.0 / frequency));
 
-    switch (voice) {
+    switch (voice[timer_index]) {
         case default_voice:
-            glissando = false;
-            note_timbre = TIMBRE_50;
+            glissando[timer_index] = false;
+            note_timbre[timer_index] = TIMBRE_50;
             polyphony_rate = 0;
 	        break;
 
     #ifdef AUDIO_VOICES
 
         case something:
-            glissando = false;
+            glissando[timer_index] = false;
             polyphony_rate = 0;
             switch (compensated_index) {
                 case 0 ... 9:
-                    note_timbre = TIMBRE_12;
+                    note_timbre[timer_index] = TIMBRE_12;
                     break;
 
                 case 10 ... 19:
-                    note_timbre = TIMBRE_25;
+                    note_timbre[timer_index] = TIMBRE_25;
                     break;
 
                 case 20 ... 200:
-                    note_timbre = .125 + .125;
+                    note_timbre[timer_index] = .125 + .125;
                     break;
 
                 default:
-                    note_timbre = .125;
+                    note_timbre[timer_index] = .125;
                     break;
             }
             break;
 
         case drums:
-            glissando = false;
+            glissando[timer_index] = false;
             polyphony_rate = 0;
                 // switch (compensated_index) {
                 //     case 0 ... 10:
-                //         note_timbre = 0.5;
+                //         note_timbre[timer_index] = 0.5;
                 //         break;
                 //     case 11 ... 20:
-                //         note_timbre = 0.5 * (21 - compensated_index) / 10;
+                //         note_timbre[timer_index] = 0.5 * (21 - compensated_index) / 10;
                 //         break;
                 //     default:
-                //         note_timbre = 0;
+                //         note_timbre[timer_index] = 0;
                 //         break;
                 // }
                 // frequency = (rand() % (int)(frequency * 1.2 - frequency)) + (frequency * 0.8);
@@ -95,15 +113,15 @@ float voice_envelope(float frequency) {
 
                 // Bass drum: 60 - 100 Hz
                 frequency = (rand() % (int)(40)) + 60;
-                switch (envelope_index) {
+                switch (envelope_index[timer_index]) {
                     case 0 ... 10:
-                        note_timbre = 0.5;
+                        note_timbre[timer_index] = 0.5;
                         break;
                     case 11 ... 20:
-                        note_timbre = 0.5 * (21 - envelope_index) / 10;
+                        note_timbre[timer_index] = 0.5 * (21 - envelope_index[timer_index]) / 10;
                         break;
                     default:
-                        note_timbre = 0;
+                        note_timbre[timer_index] = 0;
                         break;
                 }
 
@@ -112,15 +130,15 @@ float voice_envelope(float frequency) {
 
                 // Snare drum: 1 - 2 KHz
                 frequency = (rand() % (int)(1000)) + 1000;
-                switch (envelope_index) {
+                switch (envelope_index[timer_index]) {
                     case 0 ... 5:
-                        note_timbre = 0.5;
+                        note_timbre[timer_index] = 0.5;
                         break;
                     case 6 ... 20:
-                        note_timbre = 0.5 * (21 - envelope_index) / 15;
+                        note_timbre[timer_index] = 0.5 * (21 - envelope_index[timer_index]) / 15;
                         break;
                     default:
-                        note_timbre = 0;
+                        note_timbre[timer_index] = 0;
                         break;
                 }
 
@@ -128,15 +146,15 @@ float voice_envelope(float frequency) {
 
                 // Closed Hi-hat: 3 - 5 KHz
                 frequency = (rand() % (int)(2000)) + 3000;
-                switch (envelope_index) {
+                switch (envelope_index[timer_index]) {
                     case 0 ... 15:
-                        note_timbre = 0.5;
+                        note_timbre[timer_index] = 0.5;
                         break;
                     case 16 ... 20:
-                        note_timbre = 0.5 * (21 - envelope_index) / 5;
+                        note_timbre[timer_index] = 0.5 * (21 - envelope_index[timer_index]) / 5;
                         break;
                     default:
-                        note_timbre = 0;
+                        note_timbre[timer_index] = 0;
                         break;
                 }
 
@@ -144,96 +162,96 @@ float voice_envelope(float frequency) {
 
                 // Open Hi-hat: 3 - 5 KHz
                 frequency = (rand() % (int)(2000)) + 3000;
-                switch (envelope_index) {
+                switch (envelope_index[timer_index]) {
                     case 0 ... 35:
-                        note_timbre = 0.5;
+                        note_timbre[timer_index] = 0.5;
                         break;
                     case 36 ... 50:
-                        note_timbre = 0.5 * (51 - envelope_index) / 15;
+                        note_timbre[timer_index] = 0.5 * (51 - envelope_index[timer_index]) / 15;
                         break;
                     default:
-                        note_timbre = 0;
+                        note_timbre[timer_index] = 0;
                         break;
                 }
 
             }
             break;
         case butts_fader:
-            glissando = true;
+            glissando[timer_index] = true;
             polyphony_rate = 0;
             switch (compensated_index) {
                 case 0 ... 9:
                     frequency = frequency / 4;
-                    note_timbre = TIMBRE_12;
+                    note_timbre[timer_index] = TIMBRE_12;
 	                break;
 
                 case 10 ... 19:
                     frequency = frequency / 2;
-                    note_timbre = TIMBRE_12;
+                    note_timbre[timer_index] = TIMBRE_12;
 	                break;
 
                 case 20 ... 200:
-                    note_timbre = .125 - pow(((float)compensated_index - 20) / (200 - 20), 2)*.125;
+                    note_timbre[timer_index] = .125 - pow(((float)compensated_index - 20) / (200 - 20), 2)*.125;
 	                break;
 
                 default:
-                    note_timbre = 0;
+                    note_timbre[timer_index] = 0;
                 	break;
             }
     	    break;
 
-        // case octave_crunch:
-        //     polyphony_rate = 0;
-        //     switch (compensated_index) {
-        //         case 0 ... 9:
-        //         case 20 ... 24:
-        //         case 30 ... 32:
-        //             frequency = frequency / 2;
-        //             note_timbre = TIMBRE_12;
-        //         break;
-
-        //         case 10 ... 19:
-        //         case 25 ... 29:
-        //         case 33 ... 35:
-        //             frequency = frequency * 2;
-        //             note_timbre = TIMBRE_12;
-	       //          break;
+        case octave_crunch:
+            polyphony_rate = 0;
+            switch (compensated_index) {
+                case 0 ... 9:
+                case 20 ... 24:
+                case 30 ... 32:
+                    frequency = frequency / 2;
+                    note_timbre[timer_index] = TIMBRE_12;
+                break;
 
-        //         default:
-        //             note_timbre = TIMBRE_12;
-        //         	break;
-        //     }
-	       //  break;
+                case 10 ... 19:
+                case 25 ... 29:
+                case 33 ... 35:
+                    frequency = frequency * 2;
+                    note_timbre[timer_index] = TIMBRE_12;
+	                break;
+
+                default:
+                    note_timbre[timer_index] = TIMBRE_12;
+                	break;
+            }
+	        break;
 
         case duty_osc:
             // This slows the loop down a substantial amount, so higher notes may freeze
-            glissando = true;
+            glissando[timer_index] = true;
             polyphony_rate = 0;
             switch (compensated_index) {
                 default:
                     #define OCS_SPEED 10
                     #define OCS_AMP   .25
                     // sine wave is slow
-                    // note_timbre = (sin((float)compensated_index/10000*OCS_SPEED) * OCS_AMP / 2) + .5;
+                    // note_timbre[timer_index] = (sin((float)compensated_index/10000*OCS_SPEED) * OCS_AMP / 2) + .5;
                     // triangle wave is a bit faster
-                    note_timbre = (float)abs((compensated_index*OCS_SPEED % 3000) - 1500) * ( OCS_AMP / 1500 ) + (1 - OCS_AMP) / 2;
+                    note_timbre[timer_index] = (float)abs((compensated_index*OCS_SPEED % 3000) - 1500) * ( OCS_AMP / 1500 ) + (1 - OCS_AMP) / 2;
                 	break;
             }
 	        break;
 
         case duty_octave_down:
-            glissando = true;
+            glissando[timer_index] = true;
             polyphony_rate = 0;
-            note_timbre = (envelope_index % 2) * .125 + .375 * 2;
-            if ((envelope_index % 4) == 0)
-                note_timbre = 0.5;
-            if ((envelope_index % 8) == 0)
-                note_timbre = 0;
+            note_timbre[timer_index] = (envelope_index[timer_index] % 2) * .125 + .375 * 2;
+            if ((envelope_index[timer_index] % 4) == 0)
+                note_timbre[timer_index] = 0.5;
+            if ((envelope_index[timer_index] % 8) == 0)
+                note_timbre[timer_index] = 0;
             break;
         case delayed_vibrato:
-            glissando = true;
+            glissando[timer_index] = true;
             polyphony_rate = 0;
-            note_timbre = TIMBRE_50;
+            note_timbre[timer_index] = TIMBRE_50;
             #define VOICE_VIBRATO_DELAY 150
             #define VOICE_VIBRATO_SPEED 50
             switch (compensated_index) {
@@ -246,10 +264,10 @@ float voice_envelope(float frequency) {
             break;
         // case delayed_vibrato_octave:
         //     polyphony_rate = 0;
-        //     if ((envelope_index % 2) == 1) {
-        //         note_timbre = 0.55;
+        //     if ((envelope_index[timer_index] % 2) == 1) {
+        //         note_timbre[timer_index] = 0.55;
         //     } else {
-        //         note_timbre = 0.45;
+        //         note_timbre[timer_index] = 0.45;
         //     }
         //     #define VOICE_VIBRATO_DELAY 150
         //     #define VOICE_VIBRATO_SPEED 50
@@ -262,28 +280,28 @@ float voice_envelope(float frequency) {
         //     }
         //     break;
         // case duty_fifth_down:
-        //     note_timbre = 0.5;
-        //     if ((envelope_index % 3) == 0)
-        //         note_timbre = 0.75;
+        //     note_timbre[timer_index] = 0.5;
+        //     if ((envelope_index[timer_index] % 3) == 0)
+        //         note_timbre[timer_index] = 0.75;
         //     break;
         // case duty_fourth_down:
-        //     note_timbre = 0.0;
-        //     if ((envelope_index % 12) == 0)
-        //         note_timbre = 0.75;
-        //     if (((envelope_index % 12) % 4) != 1)
-        //         note_timbre = 0.75;
+        //     note_timbre[timer_index] = 0.0;
+        //     if ((envelope_index[timer_index] % 12) == 0)
+        //         note_timbre[timer_index] = 0.75;
+        //     if (((envelope_index[timer_index] % 12) % 4) != 1)
+        //         note_timbre[timer_index] = 0.75;
         //     break;
         // case duty_third_down:
-        //     note_timbre = 0.5;
-        //     if ((envelope_index % 5) == 0)
-        //         note_timbre = 0.75;
+        //     note_timbre[timer_index] = 0.5;
+        //     if ((envelope_index[timer_index] % 5) == 0)
+        //         note_timbre[timer_index] = 0.75;
         //     break;
         // case duty_fifth_third_down:
-        //     note_timbre = 0.5;
-        //     if ((envelope_index % 5) == 0)
-        //         note_timbre = 0.75;
-        //     if ((envelope_index % 3) == 0)
-        //         note_timbre = 0.25;
+        //     note_timbre[timer_index] = 0.5;
+        //     if ((envelope_index[timer_index] % 5) == 0)
+        //         note_timbre[timer_index] = 0.75;
+        //     if ((envelope_index[timer_index] % 3) == 0)
+        //         note_timbre[timer_index] = 0.25;
         //     break;
 
     #endif

quantum/audio/voices.h

@@ -24,7 +24,7 @@
 #ifndef VOICES_H
 #define VOICES_H
 
-float voice_envelope(float frequency);
+float voice_envelope(float frequency, uint8_t timer_index);
 
 typedef enum {
     default_voice,
@@ -45,8 +45,12 @@ typedef enum {
     number_of_voices // important that this is last
 } voice_type;
 
-void set_voice(voice_type v);
-void voice_iterate(void);
-void voice_deiterate(void);
+void set_all_voices(voice_type v);
+void all_voices_iterate(void);
+void all_voices_deiterate(void);
+
+void set_voice(voice_type v, uint8_t timer_index);
+void voice_iterate(uint8_t timer_index);
+void voice_deiterate(uint8_t timer_index);
 
 #endif

quantum/process_keycode/process_audio.c

@@ -38,13 +38,13 @@ bool process_audio(uint16_t keycode, keyrecord_t *record) {
     }
 
     if (keycode == MUV_IN && record->event.pressed) {
-        voice_iterate();
+        all_voices_iterate();
         PLAY_SONG(voice_change_song);
         return false;
     }
 
     if (keycode == MUV_DE && record->event.pressed) {
-        voice_deiterate();
+        all_voices_deiterate();
         PLAY_SONG(voice_change_song);
         return false;
     }

quantum/process_keycode/process_music.c

@@ -28,7 +28,7 @@ bool music_activated = false;
 bool midi_activated = false;
 uint8_t music_starting_note = 0x0C;
 int music_offset = 7;
-uint8_t music_mode = MUSIC_MODE_CHROMATIC;
+uint8_t music_mode = MUSIC_MODE_MAJOR;
 
 // music sequencer
 static bool music_sequence_recording = false;