quantum/audio/audio.c

   1 /* Copyright 2016 Jack Humbert
   2  *
   3  * This program is free software: you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License as published by
   5  * the Free Software Foundation, either version 2 of the License, or
   6  * (at your option) any later version.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15  */
  16
  17 #include <stdio.h>
  18 #include <string.h>
  19 //#include <math.h>
  20 #include <avr/pgmspace.h>
  21 #include <avr/interrupt.h>
  22 #include <avr/io.h>
  23 #include "print.h"
  24 #include "audio.h"
  25 #include "keymap.h"
  26 #include "wait.h"
  27
  28 #include "eeconfig.h"
  29
  30 #define CPU_PRESCALER 8
  31
  32 // -----------------------------------------------------------------------------
  33 // Timer Abstractions
  34 // -----------------------------------------------------------------------------
  35
  36 // TIMSK3 - Timer/Counter #3 Interrupt Mask Register
  37 // Turn on/off 3A interputs, stopping/enabling the ISR calls
  38 #ifdef C6_AUDIO
  39     #define ENABLE_AUDIO_COUNTER_3_ISR TIMSK3 |= _BV(OCIE3A)
  40     #define DISABLE_AUDIO_COUNTER_3_ISR TIMSK3 &= ~_BV(OCIE3A)
  41 #endif
  42
  43 #ifdef B5_AUDIO
  44     #define ENABLE_AUDIO_COUNTER_1_ISR TIMSK1 |= _BV(OCIE1A)
  45     #define DISABLE_AUDIO_COUNTER_1_ISR TIMSK1 &= ~_BV(OCIE1A)
  46 #endif
  47
  48 // TCCR3A: Timer/Counter #3 Control Register
  49 // Compare Output Mode (COM3An) = 0b00 = Normal port operation, OC3A disconnected from PC6
  50
  51 #ifdef C6_AUDIO
  52     #define ENABLE_AUDIO_COUNTER_3_OUTPUT TCCR3A |= _BV(COM3A1);
  53     #define DISABLE_AUDIO_COUNTER_3_OUTPUT TCCR3A &= ~(_BV(COM3A1) | _BV(COM3A0));
  54 #endif
  55
  56 #ifdef B5_AUDIO
  57     #define ENABLE_AUDIO_COUNTER_1_OUTPUT TCCR1A |= _BV(COM1A1);
  58     #define DISABLE_AUDIO_COUNTER_1_OUTPUT TCCR1A &= ~(_BV(COM1A1) | _BV(COM1A0));
  59 #endif
  60
  61 // Fast PWM Mode Controls
  62
  63 #ifdef C6_AUDIO
  64     #define TIMER_3_PERIOD     ICR3
  65     #define TIMER_3_DUTY_CYCLE OCR3A
  66 #endif
  67
  68 #ifdef B5_AUDIO
  69     #define TIMER_1_PERIOD     ICR1
  70     #define TIMER_1_DUTY_CYCLE OCR1A
  71 #endif
  72
  73
  74 // -----------------------------------------------------------------------------
  75
  76
  77 int voices = 0;
  78 int voice_place = 0;
  79 float frequency = 0;
  80 float frequency_alt = 0;
  81 int volume = 0;
  82 long position = 0;
  83
  84 float frequencies[8] = {0, 0, 0, 0, 0, 0, 0, 0};
  85 int volumes[8] = {0, 0, 0, 0, 0, 0, 0, 0};
  86 bool sliding = false;
  87
  88 float place = 0;
  89
  90 uint8_t * sample;
  91 uint16_t sample_length = 0;
  92
  93 bool     playing_notes = false;
  94 bool     playing_note = false;
  95 float    note_frequency = 0;
  96 float    note_length = 0;
  97 uint8_t  note_tempo = TEMPO_DEFAULT;
  98 float    note_timbre = TIMBRE_DEFAULT;
  99 uint16_t note_position = 0;
 100 float (* notes_pointer)[][2];
 101 uint16_t notes_count;
 102 bool     notes_repeat;
 103 bool     note_resting = false;
 104
 105 uint8_t current_note = 0;
 106 uint8_t rest_counter = 0;
 107
 108 #ifdef VIBRATO_ENABLE
 109 float vibrato_counter = 0;
 110 float vibrato_strength = .5;
 111 float vibrato_rate = 0.125;
 112 #endif
 113
 114 float polyphony_rate = 0;
 115
 116 static bool audio_initialized = false;
 117
 118 audio_config_t audio_config;
 119
 120 uint16_t envelope_index = 0;
 121 bool glissando = true;
 122
 123 #ifndef STARTUP_SONG
 124     #define STARTUP_SONG SONG(STARTUP_SOUND)
 125 #endif
 126 #ifndef AUDIO_ON_SONG
 127     #define AUDIO_ON_SONG SONG(AUDIO_ON_SOUND)
 128 #endif
 129 #ifndef AUDIO_OFF_SONG
 130     #define AUDIO_OFF_SONG SONG(AUDIO_OFF_SOUND)
 131 #endif
 132 float startup_song[][2] = STARTUP_SONG;
 133 float audio_on_song[][2] = AUDIO_ON_SONG;
 134 float audio_off_song[][2] = AUDIO_OFF_SONG;
 135
 136 void audio_init()
 137 {
 138
 139     // Check EEPROM
 140     if (!eeconfig_is_enabled())
 141     {
 142         eeconfig_init();
 143     }
 144     audio_config.raw = eeconfig_read_audio();
 145
 146     if (!audio_initialized) {
 147
 148         // Set port PC6 (OC3A and /OC4A) as output
 149
 150         #ifdef C6_AUDIO
 151             DDRC |= _BV(PORTC6);
 152         #else
 153             DDRC |= _BV(PORTC6);
 154             PORTC &= ~_BV(PORTC6);
 155         #endif
 156
 157         #ifdef B5_AUDIO
 158             DDRB |= _BV(PORTB5);
 159         #else
 160             DDRB |= _BV(PORTB5);
 161             PORTB &= ~_BV(PORTB5);
 162         #endif
 163
 164         #ifdef C6_AUDIO
 165             DISABLE_AUDIO_COUNTER_3_ISR;
 166         #endif
 167
 168         #ifdef B5_AUDIO
 169             DISABLE_AUDIO_COUNTER_1_ISR;
 170         #endif
 171
 172         // TCCR3A / TCCR3B: Timer/Counter #3 Control Registers
 173         // Compare Output Mode (COM3An) = 0b00 = Normal port operation, OC3A disconnected from PC6
 174         // Waveform Generation Mode (WGM3n) = 0b1110 = Fast PWM Mode 14 (Period = ICR3, Duty Cycle = OCR3A)
 175         // Clock Select (CS3n) = 0b010 = Clock / 8
 176
 177         #ifdef C6_AUDIO
 178             TCCR3A = (0 << COM3A1) | (0 << COM3A0) | (1 << WGM31) | (0 << WGM30);
 179             TCCR3B = (1 << WGM33)  | (1 << WGM32)  | (0 << CS32)  | (1 << CS31) | (0 << CS30);
 180         #endif
 181
 182         #ifdef B5_AUDIO
 183             TCCR1A = (0 << COM1A1) | (0 << COM1A0) | (1 << WGM11) | (0 << WGM10);
 184             TCCR1B = (1 << WGM13)  | (1 << WGM12)  | (0 << CS12)  | (1 << CS11) | (0 << CS10);
 185         #endif
 186
 187         audio_initialized = true;
 188     }
 189
 190     if (audio_config.enable) {
 191         PLAY_SONG(startup_song);
 192     }
 193
 194 }
 195
 196 void stop_all_notes()
 197 {
 198     dprintf("audio stop all notes");
 199
 200     if (!audio_initialized) {
 201         audio_init();
 202     }
 203     voices = 0;
 204
 205
 206     #ifdef C6_AUDIO
 207         DISABLE_AUDIO_COUNTER_3_ISR;
 208         DISABLE_AUDIO_COUNTER_3_OUTPUT;
 209     #endif
 210
 211     #ifdef B5_AUDIO
 212         DISABLE_AUDIO_COUNTER_1_ISR;
 213         DISABLE_AUDIO_COUNTER_1_OUTPUT;
 214     #endif
 215
 216     playing_notes = false;
 217     playing_note = false;
 218     frequency = 0;
 219     frequency_alt = 0;
 220     volume = 0;
 221
 222     for (uint8_t i = 0; i < 8; i++)
 223     {
 224         frequencies[i] = 0;
 225         volumes[i] = 0;
 226     }
 227 }
 228
 229 void stop_note(float freq)
 230 {
 231     dprintf("audio stop note freq=%d", (int)freq);
 232
 233     if (playing_note) {
 234         if (!audio_initialized) {
 235             audio_init();
 236         }
 237         for (int i = 7; i >= 0; i--) {
 238             if (frequencies[i] == freq) {
 239                 frequencies[i] = 0;
 240                 volumes[i] = 0;
 241                 for (int j = i; (j < 7); j++) {
 242                     frequencies[j] = frequencies[j+1];
 243                     frequencies[j+1] = 0;
 244                     volumes[j] = volumes[j+1];
 245                     volumes[j+1] = 0;
 246                 }
 247                 break;
 248             }
 249         }
 250         voices--;
 251         if (voices < 0)
 252             voices = 0;
 253         if (voice_place >= voices) {
 254             voice_place = 0;
 255         }
 256         if (voices == 0) {
 257             #ifdef C6_AUDIO
 258                 DISABLE_AUDIO_COUNTER_3_ISR;
 259                 DISABLE_AUDIO_COUNTER_3_OUTPUT;
 260             #endif
 261             #ifdef B5_AUDIO
 262                 DISABLE_AUDIO_COUNTER_1_ISR;
 263                 DISABLE_AUDIO_COUNTER_1_OUTPUT;
 264             #endif
 265             frequency = 0;
 266             frequency_alt = 0;
 267             volume = 0;
 268             playing_note = false;
 269         }
 270     }
 271 }
 272
 273 #ifdef VIBRATO_ENABLE
 274
 275 float mod(float a, int b)
 276 {
 277     float r = fmod(a, b);
 278     return r < 0 ? r + b : r;
 279 }
 280
 281 float vibrato(float average_freq) {
 282     #ifdef VIBRATO_STRENGTH_ENABLE
 283         float vibrated_freq = average_freq * pow(vibrato_lut[(int)vibrato_counter], vibrato_strength);
 284     #else
 285         float vibrated_freq = average_freq * vibrato_lut[(int)vibrato_counter];
 286     #endif
 287     vibrato_counter = mod((vibrato_counter + vibrato_rate * (1.0 + 440.0/average_freq)), VIBRATO_LUT_LENGTH);
 288     return vibrated_freq;
 289 }
 290
 291 #endif
 292
 293 #ifdef C6_AUDIO
 294 ISR(TIMER3_COMPA_vect)
 295 {
 296     float freq;
 297
 298     if (playing_note) {
 299         if (voices > 0) {
 300
 301             #ifdef B5_AUDIO
 302             float freq_alt = 0;
 303                 if (voices > 1) {
 304                     if (polyphony_rate == 0) {
 305                         if (glissando) {
 306                             if (frequency_alt != 0 && frequency_alt < frequencies[voices - 2] && frequency_alt < frequencies[voices - 2] * pow(2, -440/frequencies[voices - 2]/12/2)) {
 307                                 frequency_alt = frequency_alt * pow(2, 440/frequency_alt/12/2);
 308                             } else if (frequency_alt != 0 && frequency_alt > frequencies[voices - 2] && frequency_alt > frequencies[voices - 2] * pow(2, 440/frequencies[voices - 2]/12/2)) {
 309                                 frequency_alt = frequency_alt * pow(2, -440/frequency_alt/12/2);
 310                             } else {
 311                                 frequency_alt = frequencies[voices - 2];
 312                             }
 313                         } else {
 314                             frequency_alt = frequencies[voices - 2];
 315                         }
 316
 317                         #ifdef VIBRATO_ENABLE
 318                             if (vibrato_strength > 0) {
 319                                 freq_alt = vibrato(frequency_alt);
 320                             } else {
 321                                 freq_alt = frequency_alt;
 322                             }
 323                         #else
 324                             freq_alt = frequency_alt;
 325                         #endif
 326                     }
 327
 328                     if (envelope_index < 65535) {
 329                         envelope_index++;
 330                     }
 331
 332                     freq_alt = voice_envelope(freq_alt);
 333
 334                     if (freq_alt < 30.517578125) {
 335                         freq_alt = 30.52;
 336                     }
 337
 338                     TIMER_1_PERIOD = (uint16_t)(((float)F_CPU) / (freq_alt * CPU_PRESCALER));
 339                     TIMER_1_DUTY_CYCLE = (uint16_t)((((float)F_CPU) / (freq_alt * CPU_PRESCALER)) * note_timbre);
 340                 }
 341             #endif
 342
 343             if (polyphony_rate > 0) {
 344                 if (voices > 1) {
 345                     voice_place %= voices;
 346                     if (place++ > (frequencies[voice_place] / polyphony_rate / CPU_PRESCALER)) {
 347                         voice_place = (voice_place + 1) % voices;
 348                         place = 0.0;
 349                     }
 350                 }
 351
 352                 #ifdef VIBRATO_ENABLE
 353                     if (vibrato_strength > 0) {
 354                         freq = vibrato(frequencies[voice_place]);
 355                     } else {
 356                         freq = frequencies[voice_place];
 357                     }
 358                 #else
 359                     freq = frequencies[voice_place];
 360                 #endif
 361             } else {
 362                 if (glissando) {
 363                     if (frequency != 0 && frequency < frequencies[voices - 1] && frequency < frequencies[voices - 1] * pow(2, -440/frequencies[voices - 1]/12/2)) {
 364                         frequency = frequency * pow(2, 440/frequency/12/2);
 365                     } else if (frequency != 0 && frequency > frequencies[voices - 1] && frequency > frequencies[voices - 1] * pow(2, 440/frequencies[voices - 1]/12/2)) {
 366                         frequency = frequency * pow(2, -440/frequency/12/2);
 367                     } else {
 368                         frequency = frequencies[voices - 1];
 369                     }
 370                 } else {
 371                     frequency = frequencies[voices - 1];
 372                 }
 373
 374                 #ifdef VIBRATO_ENABLE
 375                     if (vibrato_strength > 0) {
 376                         freq = vibrato(frequency);
 377                     } else {
 378                         freq = frequency;
 379                     }
 380                 #else
 381                     freq = frequency;
 382                 #endif
 383             }
 384
 385             if (envelope_index < 65535) {
 386                 envelope_index++;
 387             }
 388
 389             freq = voice_envelope(freq);
 390
 391             if (freq < 30.517578125) {
 392                 freq = 30.52;
 393             }
 394
 395             TIMER_3_PERIOD = (uint16_t)(((float)F_CPU) / (freq * CPU_PRESCALER));
 396             TIMER_3_DUTY_CYCLE = (uint16_t)((((float)F_CPU) / (freq * CPU_PRESCALER)) * note_timbre);
 397         }
 398     }
 399
 400     if (playing_notes) {
 401         if (note_frequency > 0) {
 402             #ifdef VIBRATO_ENABLE
 403                 if (vibrato_strength > 0) {
 404                     freq = vibrato(note_frequency);
 405                 } else {
 406                     freq = note_frequency;
 407                 }
 408             #else
 409                     freq = note_frequency;
 410             #endif
 411
 412             if (envelope_index < 65535) {
 413                 envelope_index++;
 414             }
 415             freq = voice_envelope(freq);
 416
 417             TIMER_3_PERIOD = (uint16_t)(((float)F_CPU) / (freq * CPU_PRESCALER));
 418             TIMER_3_DUTY_CYCLE = (uint16_t)((((float)F_CPU) / (freq * CPU_PRESCALER)) * note_timbre);
 419         } else {
 420             TIMER_3_PERIOD = 0;
 421             TIMER_3_DUTY_CYCLE = 0;
 422         }
 423
 424         note_position++;
 425         bool end_of_note = false;
 426         if (TIMER_3_PERIOD > 0) {
 427             if (!note_resting)
 428                 end_of_note = (note_position >= (note_length / TIMER_3_PERIOD * 0xFFFF - 1));
 429             else
 430                 end_of_note = (note_position >= (note_length));
 431         } else {
 432             end_of_note = (note_position >= (note_length));
 433         }
 434
 435         if (end_of_note) {
 436             current_note++;
 437             if (current_note >= notes_count) {
 438                 if (notes_repeat) {
 439                     current_note = 0;
 440                 } else {
 441                     DISABLE_AUDIO_COUNTER_3_ISR;
 442                     DISABLE_AUDIO_COUNTER_3_OUTPUT;
 443                     playing_notes = false;
 444                     return;
 445                 }
 446             }
 447             if (!note_resting) {
 448                 note_resting = true;
 449                 current_note--;
 450                 if ((*notes_pointer)[current_note][0] == (*notes_pointer)[current_note + 1][0]) {
 451                     note_frequency = 0;
 452                     note_length = 1;
 453                 } else {
 454                     note_frequency = (*notes_pointer)[current_note][0];
 455                     note_length = 1;
 456                 }
 457             } else {
 458                 note_resting = false;
 459                 envelope_index = 0;
 460                 note_frequency = (*notes_pointer)[current_note][0];
 461                 note_length = ((*notes_pointer)[current_note][1] / 4) * (((float)note_tempo) / 100);
 462             }
 463
 464             note_position = 0;
 465         }
 466     }
 467
 468     if (!audio_config.enable) {
 469         playing_notes = false;
 470         playing_note = false;
 471     }
 472 }
 473 #endif
 474
 475 #ifdef B5_AUDIO
 476 ISR(TIMER1_COMPA_vect)
 477 {
 478     #if defined(B5_AUDIO) && !defined(C6_AUDIO)
 479     float freq = 0;
 480
 481     if (playing_note) {
 482         if (voices > 0) {
 483             if (polyphony_rate > 0) {
 484                 if (voices > 1) {
 485                     voice_place %= voices;
 486                     if (place++ > (frequencies[voice_place] / polyphony_rate / CPU_PRESCALER)) {
 487                         voice_place = (voice_place + 1) % voices;
 488                         place = 0.0;
 489                     }
 490                 }
 491
 492                 #ifdef VIBRATO_ENABLE
 493                     if (vibrato_strength > 0) {
 494                         freq = vibrato(frequencies[voice_place]);
 495                     } else {
 496                         freq = frequencies[voice_place];
 497                     }
 498                 #else
 499                     freq = frequencies[voice_place];
 500                 #endif
 501             } else {
 502                 if (glissando) {
 503                     if (frequency != 0 && frequency < frequencies[voices - 1] && frequency < frequencies[voices - 1] * pow(2, -440/frequencies[voices - 1]/12/2)) {
 504                         frequency = frequency * pow(2, 440/frequency/12/2);
 505                     } else if (frequency != 0 && frequency > frequencies[voices - 1] && frequency > frequencies[voices - 1] * pow(2, 440/frequencies[voices - 1]/12/2)) {
 506                         frequency = frequency * pow(2, -440/frequency/12/2);
 507                     } else {
 508                         frequency = frequencies[voices - 1];
 509                     }
 510                 } else {
 511                     frequency = frequencies[voices - 1];
 512                 }
 513
 514                 #ifdef VIBRATO_ENABLE
 515                     if (vibrato_strength > 0) {
 516                         freq = vibrato(frequency);
 517                     } else {
 518                         freq = frequency;
 519                     }
 520                 #else
 521                     freq = frequency;
 522                 #endif
 523             }
 524
 525             if (envelope_index < 65535) {
 526                 envelope_index++;
 527             }
 528
 529             freq = voice_envelope(freq);
 530
 531             if (freq < 30.517578125) {
 532                 freq = 30.52;
 533             }
 534
 535             TIMER_1_PERIOD = (uint16_t)(((float)F_CPU) / (freq * CPU_PRESCALER));
 536             TIMER_1_DUTY_CYCLE = (uint16_t)((((float)F_CPU) / (freq * CPU_PRESCALER)) * note_timbre);
 537         }
 538     }
 539
 540     if (playing_notes) {
 541         if (note_frequency > 0) {
 542             #ifdef VIBRATO_ENABLE
 543                 if (vibrato_strength > 0) {
 544                     freq = vibrato(note_frequency);
 545                 } else {
 546                     freq = note_frequency;
 547                 }
 548             #else
 549                     freq = note_frequency;
 550             #endif
 551
 552             if (envelope_index < 65535) {
 553                 envelope_index++;
 554             }
 555             freq = voice_envelope(freq);
 556
 557             TIMER_1_PERIOD = (uint16_t)(((float)F_CPU) / (freq * CPU_PRESCALER));
 558             TIMER_1_DUTY_CYCLE = (uint16_t)((((float)F_CPU) / (freq * CPU_PRESCALER)) * note_timbre);
 559         } else {
 560             TIMER_1_PERIOD = 0;
 561             TIMER_1_DUTY_CYCLE = 0;
 562         }
 563
 564         note_position++;
 565         bool end_of_note = false;
 566         if (TIMER_1_PERIOD > 0) {
 567             if (!note_resting)
 568                 end_of_note = (note_position >= (note_length / TIMER_1_PERIOD * 0xFFFF - 1));
 569             else
 570                 end_of_note = (note_position >= (note_length));
 571         } else {
 572             end_of_note = (note_position >= (note_length));
 573         }
 574
 575         if (end_of_note) {
 576             current_note++;
 577             if (current_note >= notes_count) {
 578                 if (notes_repeat) {
 579                     current_note = 0;
 580                 } else {
 581                     DISABLE_AUDIO_COUNTER_1_ISR;
 582                     DISABLE_AUDIO_COUNTER_1_OUTPUT;
 583                     playing_notes = false;
 584                     return;
 585                 }
 586             }
 587             if (!note_resting) {
 588                 note_resting = true;
 589                 current_note--;
 590                 if ((*notes_pointer)[current_note][0] == (*notes_pointer)[current_note + 1][0]) {
 591                     note_frequency = 0;
 592                     note_length = 1;
 593                 } else {
 594                     note_frequency = (*notes_pointer)[current_note][0];
 595                     note_length = 1;
 596                 }
 597             } else {
 598                 note_resting = false;
 599                 envelope_index = 0;
 600                 note_frequency = (*notes_pointer)[current_note][0];
 601                 note_length = ((*notes_pointer)[current_note][1] / 4) * (((float)note_tempo) / 100);
 602             }
 603
 604             note_position = 0;
 605         }
 606     }
 607
 608     if (!audio_config.enable) {
 609         playing_notes = false;
 610         playing_note = false;
 611     }
 612 #endif
 613 }
 614 #endif
 615
 616 void play_note(float freq, int vol) {
 617
 618     dprintf("audio play note freq=%d vol=%d", (int)freq, vol);
 619
 620     if (!audio_initialized) {
 621         audio_init();
 622     }
 623
 624     if (audio_config.enable && voices < 8) {
 625         #ifdef C6_AUDIO
 626             DISABLE_AUDIO_COUNTER_3_ISR;
 627         #endif
 628         #ifdef B5_AUDIO
 629             DISABLE_AUDIO_COUNTER_1_ISR;
 630         #endif
 631
 632         // Cancel notes if notes are playing
 633         if (playing_notes)
 634             stop_all_notes();
 635
 636         playing_note = true;
 637
 638         envelope_index = 0;
 639
 640         if (freq > 0) {
 641             frequencies[voices] = freq;
 642             volumes[voices] = vol;
 643             voices++;
 644         }
 645
 646         #ifdef C6_AUDIO
 647             ENABLE_AUDIO_COUNTER_3_ISR;
 648             ENABLE_AUDIO_COUNTER_3_OUTPUT;
 649         #endif
 650         #ifdef B5_AUDIO
 651             #ifdef C6_AUDIO
 652             if (voices > 1) {
 653                 ENABLE_AUDIO_COUNTER_1_ISR;
 654                 ENABLE_AUDIO_COUNTER_1_OUTPUT;
 655             }
 656             #else
 657             ENABLE_AUDIO_COUNTER_1_ISR;
 658             ENABLE_AUDIO_COUNTER_1_OUTPUT;
 659             #endif
 660         #endif
 661     }
 662
 663 }
 664
 665 void play_notes(float (*np)[][2], uint16_t n_count, bool n_repeat)
 666 {
 667
 668     if (!audio_initialized) {
 669         audio_init();
 670     }
 671
 672     if (audio_config.enable) {
 673
 674         #ifdef C6_AUDIO
 675             DISABLE_AUDIO_COUNTER_3_ISR;
 676         #endif
 677         #ifdef B5_AUDIO
 678             DISABLE_AUDIO_COUNTER_1_ISR;
 679         #endif
 680
 681         // Cancel note if a note is playing
 682         if (playing_note)
 683             stop_all_notes();
 684
 685         playing_notes = true;
 686
 687         notes_pointer = np;
 688         notes_count = n_count;
 689         notes_repeat = n_repeat;
 690
 691         place = 0;
 692         current_note = 0;
 693
 694         note_frequency = (*notes_pointer)[current_note][0];
 695         note_length = ((*notes_pointer)[current_note][1] / 4) * (((float)note_tempo) / 100);
 696         note_position = 0;
 697
 698
 699         #ifdef C6_AUDIO
 700             ENABLE_AUDIO_COUNTER_3_ISR;
 701             ENABLE_AUDIO_COUNTER_3_OUTPUT;
 702         #endif
 703         #ifdef B5_AUDIO
 704             #ifndef C6_AUDIO
 705             ENABLE_AUDIO_COUNTER_1_ISR;
 706             ENABLE_AUDIO_COUNTER_1_OUTPUT;
 707             #endif
 708         #endif
 709     }
 710
 711 }
 712
 713 bool is_playing_notes(void) {
 714     return playing_notes;
 715 }
 716
 717 bool is_audio_on(void) {
 718     return (audio_config.enable != 0);
 719 }
 720
 721 void audio_toggle(void) {
 722     audio_config.enable ^= 1;
 723     eeconfig_update_audio(audio_config.raw);
 724     if (audio_config.enable)
 725         audio_on_user();
 726 }
 727
 728 void audio_on(void) {
 729     audio_config.enable = 1;
 730     eeconfig_update_audio(audio_config.raw);
 731     audio_on_user();
 732     PLAY_SONG(audio_on_song);
 733 }
 734
 735 void audio_off(void) {
 736     PLAY_SONG(audio_off_song);
 737     wait_ms(100);
 738     stop_all_notes();
 739     audio_config.enable = 0;
 740     eeconfig_update_audio(audio_config.raw);
 741 }
 742
 743 #ifdef VIBRATO_ENABLE
 744
 745 // Vibrato rate functions
 746
 747 void set_vibrato_rate(float rate) {
 748     vibrato_rate = rate;
 749 }
 750
 751 void increase_vibrato_rate(float change) {
 752     vibrato_rate *= change;
 753 }
 754
 755 void decrease_vibrato_rate(float change) {
 756     vibrato_rate /= change;
 757 }
 758
 759 #ifdef VIBRATO_STRENGTH_ENABLE
 760
 761 void set_vibrato_strength(float strength) {
 762     vibrato_strength = strength;
 763 }
 764
 765 void increase_vibrato_strength(float change) {
 766     vibrato_strength *= change;
 767 }
 768
 769 void decrease_vibrato_strength(float change) {
 770     vibrato_strength /= change;
 771 }
 772
 773 #endif  /* VIBRATO_STRENGTH_ENABLE */
 774
 775 #endif /* VIBRATO_ENABLE */
 776
 777 // Polyphony functions
 778
 779 void set_polyphony_rate(float rate) {
 780     polyphony_rate = rate;
 781 }
 782
 783 void enable_polyphony() {
 784     polyphony_rate = 5;
 785 }
 786
 787 void disable_polyphony() {
 788     polyphony_rate = 0;
 789 }
 790
 791 void increase_polyphony_rate(float change) {
 792     polyphony_rate *= change;
 793 }
 794
 795 void decrease_polyphony_rate(float change) {
 796     polyphony_rate /= change;
 797 }
 798
 799 // Timbre function
 800
 801 void set_timbre(float timbre) {
 802     note_timbre = timbre;
 803 }
 804
 805 // Tempo functions
 806
 807 void set_tempo(uint8_t tempo) {
 808     note_tempo = tempo;
 809 }
 810
 811 void decrease_tempo(uint8_t tempo_change) {
 812     note_tempo += tempo_change;
 813 }
 814
 815 void increase_tempo(uint8_t tempo_change) {
 816     if (note_tempo - tempo_change < 10) {
 817         note_tempo = 10;
 818     } else {
 819         note_tempo -= tempo_change;
 820     }
 821 }