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 #if defined(__AVR__)
  21   #include <avr/pgmspace.h>
  22   #include <avr/interrupt.h>
  23   #include <avr/io.h>
  24 #endif
  25 #include "print.h"
  26 #include "audio.h"
  27 #include "keymap.h"
  28 #include "wait.h"
  29
  30 #include "eeconfig.h"
  31
  32 #define CPU_PRESCALER 8
  33
  34 // -----------------------------------------------------------------------------
  35 // Timer Abstractions
  36 // -----------------------------------------------------------------------------
  37
  38 // TIMSK3 - Timer/Counter #3 Interrupt Mask Register
  39 // Turn on/off 3A interputs, stopping/enabling the ISR calls
  40 #ifdef C6_AUDIO
  41     #define ENABLE_AUDIO_COUNTER_3_ISR TIMSK3 |= _BV(OCIE3A)
  42     #define DISABLE_AUDIO_COUNTER_3_ISR TIMSK3 &= ~_BV(OCIE3A)
  43 #endif
  44
  45 #ifdef B5_AUDIO
  46     #define ENABLE_AUDIO_COUNTER_1_ISR TIMSK1 |= _BV(OCIE1A)
  47     #define DISABLE_AUDIO_COUNTER_1_ISR TIMSK1 &= ~_BV(OCIE1A)
  48 #endif
  49
  50 // TCCR3A: Timer/Counter #3 Control Register
  51 // Compare Output Mode (COM3An) = 0b00 = Normal port operation, OC3A disconnected from PC6
  52
  53 #ifdef C6_AUDIO
  54     #define ENABLE_AUDIO_COUNTER_3_OUTPUT TCCR3A |= _BV(COM3A1);
  55     #define DISABLE_AUDIO_COUNTER_3_OUTPUT TCCR3A &= ~(_BV(COM3A1) | _BV(COM3A0));
  56 #endif
  57
  58 #ifdef B5_AUDIO
  59     #define ENABLE_AUDIO_COUNTER_1_OUTPUT TCCR1A |= _BV(COM1A1);
  60     #define DISABLE_AUDIO_COUNTER_1_OUTPUT TCCR1A &= ~(_BV(COM1A1) | _BV(COM1A0));
  61 #endif
  62
  63 // Fast PWM Mode Controls
  64
  65 #ifdef C6_AUDIO
  66     #define TIMER_3_PERIOD     ICR3
  67     #define TIMER_3_DUTY_CYCLE OCR3A
  68 #endif
  69
  70 #ifdef B5_AUDIO
  71     #define TIMER_1_PERIOD     ICR1
  72     #define TIMER_1_DUTY_CYCLE OCR1A
  73 #endif
  74
  75
  76 // -----------------------------------------------------------------------------
  77
  78
  79 int voices = 0;
  80 int voice_place = 0;
  81 float frequency = 0;
  82 float frequency_alt = 0;
  83 int volume = 0;
  84 long position = 0;
  85
  86 float frequencies[8] = {0, 0, 0, 0, 0, 0, 0, 0};
  87 int volumes[8] = {0, 0, 0, 0, 0, 0, 0, 0};
  88 bool sliding = false;
  89
  90 float place = 0;
  91
  92 uint8_t * sample;
  93 uint16_t sample_length = 0;
  94
  95 bool     playing_notes = false;
  96 bool     playing_note = false;
  97 float    note_frequency = 0;
  98 float    note_length = 0;
  99 uint8_t  note_tempo = TEMPO_DEFAULT;
 100 float    note_timbre = TIMBRE_DEFAULT;
 101 uint16_t note_position = 0;
 102 float (* notes_pointer)[][2];
 103 uint16_t notes_count;
 104 bool     notes_repeat;
 105 bool     note_resting = false;
 106
 107 uint8_t current_note = 0;
 108 uint8_t rest_counter = 0;
 109
 110 #ifdef VIBRATO_ENABLE
 111 float vibrato_counter = 0;
 112 float vibrato_strength = .5;
 113 float vibrato_rate = 0.125;
 114 #endif
 115
 116 float polyphony_rate = 0;
 117
 118 static bool audio_initialized = false;
 119
 120 audio_config_t audio_config;
 121
 122 uint16_t envelope_index = 0;
 123 bool glissando = true;
 124
 125 #ifndef STARTUP_SONG
 126     #define STARTUP_SONG SONG(STARTUP_SOUND)
 127 #endif
 128 #ifndef AUDIO_ON_SONG
 129     #define AUDIO_ON_SONG SONG(AUDIO_ON_SOUND)
 130 #endif
 131 #ifndef AUDIO_OFF_SONG
 132     #define AUDIO_OFF_SONG SONG(AUDIO_OFF_SOUND)
 133 #endif
 134 float startup_song[][2] = STARTUP_SONG;
 135 float audio_on_song[][2] = AUDIO_ON_SONG;
 136 float audio_off_song[][2] = AUDIO_OFF_SONG;
 137
 138 void audio_init()
 139 {
 140
 141     // Check EEPROM
 142     if (!eeconfig_is_enabled())
 143     {
 144         eeconfig_init();
 145     }
 146     audio_config.raw = eeconfig_read_audio();
 147
 148     if (!audio_initialized) {
 149
 150         // Set port PC6 (OC3A and /OC4A) as output
 151
 152         #ifdef C6_AUDIO
 153             DDRC |= _BV(PORTC6);
 154         //#else
 155         //    DDRC |= _BV(PORTC6); // Why is PC6 being set as output low, if C6_audio isn't defined?
 156         //    PORTC &= ~_BV(PORTC6);
 157         #endif
 158
 159         #ifdef B5_AUDIO
 160             DDRB |= _BV(PORTB5);
 161         //#else
 162         //    DDRB |= _BV(PORTB5); // Same as with PC6
 163         //    PORTB &= ~_BV(PORTB5);
 164         #endif
 165
 166         #ifdef C6_AUDIO
 167             DISABLE_AUDIO_COUNTER_3_ISR;
 168         #endif
 169
 170         #ifdef B5_AUDIO
 171             DISABLE_AUDIO_COUNTER_1_ISR;
 172         #endif
 173
 174         // TCCR3A / TCCR3B: Timer/Counter #3 Control Registers
 175         // Compare Output Mode (COM3An) = 0b00 = Normal port operation, OC3A disconnected from PC6
 176         // Waveform Generation Mode (WGM3n) = 0b1110 = Fast PWM Mode 14 (Period = ICR3, Duty Cycle = OCR3A)
 177         // Clock Select (CS3n) = 0b010 = Clock / 8
 178
 179         #ifdef C6_AUDIO
 180             TCCR3A = (0 << COM3A1) | (0 << COM3A0) | (1 << WGM31) | (0 << WGM30);
 181             TCCR3B = (1 << WGM33)  | (1 << WGM32)  | (0 << CS32)  | (1 << CS31) | (0 << CS30);
 182         #endif
 183
 184         #ifdef B5_AUDIO
 185             TCCR1A = (0 << COM1A1) | (0 << COM1A0) | (1 << WGM11) | (0 << WGM10);
 186             TCCR1B = (1 << WGM13)  | (1 << WGM12)  | (0 << CS12)  | (1 << CS11) | (0 << CS10);
 187
 188             TIMER_1_PERIOD = (uint16_t)(((float)F_CPU) / (440 * CPU_PRESCALER));
 189             TIMER_1_DUTY_CYCLE = (uint16_t)((((float)F_CPU) / (440 * CPU_PRESCALER)) * note_timbre);
 190         #endif
 191
 192         audio_initialized = true;
 193     }
 194
 195     if (audio_config.enable) {
 196         PLAY_SONG(startup_song);
 197     }
 198
 199 }
 200
 201 void stop_all_notes()
 202 {
 203     dprintf("audio stop all notes");
 204
 205     if (!audio_initialized) {
 206         audio_init();
 207     }
 208     voices = 0;
 209
 210
 211     #ifdef C6_AUDIO
 212         DISABLE_AUDIO_COUNTER_3_ISR;
 213         DISABLE_AUDIO_COUNTER_3_OUTPUT;
 214     #endif
 215
 216     #ifdef B5_AUDIO
 217         DISABLE_AUDIO_COUNTER_1_ISR;
 218         DISABLE_AUDIO_COUNTER_1_OUTPUT;
 219     #endif
 220
 221     playing_notes = false;
 222     playing_note = false;
 223     frequency = 0;
 224     frequency_alt = 0;
 225     volume = 0;
 226
 227     for (uint8_t i = 0; i < 8; i++)
 228     {
 229         frequencies[i] = 0;
 230         volumes[i] = 0;
 231     }
 232 }
 233
 234 void stop_note(float freq)
 235 {
 236     dprintf("audio stop note freq=%d", (int)freq);
 237
 238     if (playing_note) {
 239         if (!audio_initialized) {
 240             audio_init();
 241         }
 242         for (int i = 7; i >= 0; i--) {
 243             if (frequencies[i] == freq) {
 244                 frequencies[i] = 0;
 245                 volumes[i] = 0;
 246                 for (int j = i; (j < 7); j++) {
 247                     frequencies[j] = frequencies[j+1];
 248                     frequencies[j+1] = 0;
 249                     volumes[j] = volumes[j+1];
 250                     volumes[j+1] = 0;
 251                 }
 252                 break;
 253             }
 254         }
 255         voices--;
 256         if (voices < 0)
 257             voices = 0;
 258         if (voice_place >= voices) {
 259             voice_place = 0;
 260         }
 261         if (voices == 0) {
 262             #ifdef C6_AUDIO
 263                 DISABLE_AUDIO_COUNTER_3_ISR;
 264                 DISABLE_AUDIO_COUNTER_3_OUTPUT;
 265             #endif
 266             #ifdef B5_AUDIO
 267                 DISABLE_AUDIO_COUNTER_1_ISR;
 268                 DISABLE_AUDIO_COUNTER_1_OUTPUT;
 269             #endif
 270             frequency = 0;
 271             frequency_alt = 0;
 272             volume = 0;
 273             playing_note = false;
 274         }
 275     }
 276 }
 277
 278 #ifdef VIBRATO_ENABLE
 279
 280 float mod(float a, int b)
 281 {
 282     float r = fmod(a, b);
 283     return r < 0 ? r + b : r;
 284 }
 285
 286 float vibrato(float average_freq) {
 287     #ifdef VIBRATO_STRENGTH_ENABLE
 288         float vibrated_freq = average_freq * pow(vibrato_lut[(int)vibrato_counter], vibrato_strength);
 289     #else
 290         float vibrated_freq = average_freq * vibrato_lut[(int)vibrato_counter];
 291     #endif
 292     vibrato_counter = mod((vibrato_counter + vibrato_rate * (1.0 + 440.0/average_freq)), VIBRATO_LUT_LENGTH);
 293     return vibrated_freq;
 294 }
 295
 296 #endif
 297
 298 #ifdef C6_AUDIO
 299 ISR(TIMER3_COMPA_vect)
 300 {
 301     float freq;
 302
 303     if (playing_note) {
 304         if (voices > 0) {
 305
 306             #ifdef B5_AUDIO
 307             float freq_alt = 0;
 308                 if (voices > 1) {
 309                     if (polyphony_rate == 0) {
 310                         if (glissando) {
 311                             if (frequency_alt != 0 && frequency_alt < frequencies[voices - 2] && frequency_alt < frequencies[voices - 2] * pow(2, -440/frequencies[voices - 2]/12/2)) {
 312                                 frequency_alt = frequency_alt * pow(2, 440/frequency_alt/12/2);
 313                             } else if (frequency_alt != 0 && frequency_alt > frequencies[voices - 2] && frequency_alt > frequencies[voices - 2] * pow(2, 440/frequencies[voices - 2]/12/2)) {
 314                                 frequency_alt = frequency_alt * pow(2, -440/frequency_alt/12/2);
 315                             } else {
 316                                 frequency_alt = frequencies[voices - 2];
 317                             }
 318                         } else {
 319                             frequency_alt = frequencies[voices - 2];
 320                         }
 321
 322                         #ifdef VIBRATO_ENABLE
 323                             if (vibrato_strength > 0) {
 324                                 freq_alt = vibrato(frequency_alt);
 325                             } else {
 326                                 freq_alt = frequency_alt;
 327                             }
 328                         #else
 329                             freq_alt = frequency_alt;
 330                         #endif
 331                     }
 332
 333                     if (envelope_index < 65535) {
 334                         envelope_index++;
 335                     }
 336
 337                     freq_alt = voice_envelope(freq_alt);
 338
 339                     if (freq_alt < 30.517578125) {
 340                         freq_alt = 30.52;
 341                     }
 342
 343                     TIMER_1_PERIOD = (uint16_t)(((float)F_CPU) / (freq_alt * CPU_PRESCALER));
 344                     TIMER_1_DUTY_CYCLE = (uint16_t)((((float)F_CPU) / (freq_alt * CPU_PRESCALER)) * note_timbre);
 345                 }
 346             #endif
 347
 348             if (polyphony_rate > 0) {
 349                 if (voices > 1) {
 350                     voice_place %= voices;
 351                     if (place++ > (frequencies[voice_place] / polyphony_rate / CPU_PRESCALER)) {
 352                         voice_place = (voice_place + 1) % voices;
 353                         place = 0.0;
 354                     }
 355                 }
 356
 357                 #ifdef VIBRATO_ENABLE
 358                     if (vibrato_strength > 0) {
 359                         freq = vibrato(frequencies[voice_place]);
 360                     } else {
 361                         freq = frequencies[voice_place];
 362                     }
 363                 #else
 364                     freq = frequencies[voice_place];
 365                 #endif
 366             } else {
 367                 if (glissando) {
 368                     if (frequency != 0 && frequency < frequencies[voices - 1] && frequency < frequencies[voices - 1] * pow(2, -440/frequencies[voices - 1]/12/2)) {
 369                         frequency = frequency * pow(2, 440/frequency/12/2);
 370                     } else if (frequency != 0 && frequency > frequencies[voices - 1] && frequency > frequencies[voices - 1] * pow(2, 440/frequencies[voices - 1]/12/2)) {
 371                         frequency = frequency * pow(2, -440/frequency/12/2);
 372                     } else {
 373                         frequency = frequencies[voices - 1];
 374                     }
 375                 } else {
 376                     frequency = frequencies[voices - 1];
 377                 }
 378
 379                 #ifdef VIBRATO_ENABLE
 380                     if (vibrato_strength > 0) {
 381                         freq = vibrato(frequency);
 382                     } else {
 383                         freq = frequency;
 384                     }
 385                 #else
 386                     freq = frequency;
 387                 #endif
 388             }
 389
 390             if (envelope_index < 65535) {
 391                 envelope_index++;
 392             }
 393
 394             freq = voice_envelope(freq);
 395
 396             if (freq < 30.517578125) {
 397                 freq = 30.52;
 398             }
 399
 400             TIMER_3_PERIOD = (uint16_t)(((float)F_CPU) / (freq * CPU_PRESCALER));
 401             TIMER_3_DUTY_CYCLE = (uint16_t)((((float)F_CPU) / (freq * CPU_PRESCALER)) * note_timbre);
 402         }
 403     }
 404
 405     if (playing_notes) {
 406         if (note_frequency > 0) {
 407             #ifdef VIBRATO_ENABLE
 408                 if (vibrato_strength > 0) {
 409                     freq = vibrato(note_frequency);
 410                 } else {
 411                     freq = note_frequency;
 412                 }
 413             #else
 414                     freq = note_frequency;
 415             #endif
 416
 417             if (envelope_index < 65535) {
 418                 envelope_index++;
 419             }
 420             freq = voice_envelope(freq);
 421
 422             TIMER_3_PERIOD = (uint16_t)(((float)F_CPU) / (freq * CPU_PRESCALER));
 423             TIMER_3_DUTY_CYCLE = (uint16_t)((((float)F_CPU) / (freq * CPU_PRESCALER)) * note_timbre);
 424         } else {
 425             TIMER_3_PERIOD = 0;
 426             TIMER_3_DUTY_CYCLE = 0;
 427         }
 428
 429         note_position++;
 430         bool end_of_note = false;
 431         if (TIMER_3_PERIOD > 0) {
 432             if (!note_resting)
 433                 end_of_note = (note_position >= (note_length / TIMER_3_PERIOD * 0xFFFF - 1));
 434             else
 435                 end_of_note = (note_position >= (note_length));
 436         } else {
 437             end_of_note = (note_position >= (note_length));
 438         }
 439
 440         if (end_of_note) {
 441             current_note++;
 442             if (current_note >= notes_count) {
 443                 if (notes_repeat) {
 444                     current_note = 0;
 445                 } else {
 446                     DISABLE_AUDIO_COUNTER_3_ISR;
 447                     DISABLE_AUDIO_COUNTER_3_OUTPUT;
 448                     playing_notes = false;
 449                     return;
 450                 }
 451             }
 452             if (!note_resting) {
 453                 note_resting = true;
 454                 current_note--;
 455                 if ((*notes_pointer)[current_note][0] == (*notes_pointer)[current_note + 1][0]) {
 456                     note_frequency = 0;
 457                     note_length = 1;
 458                 } else {
 459                     note_frequency = (*notes_pointer)[current_note][0];
 460                     note_length = 1;
 461                 }
 462             } else {
 463                 note_resting = false;
 464                 envelope_index = 0;
 465                 note_frequency = (*notes_pointer)[current_note][0];
 466                 note_length = ((*notes_pointer)[current_note][1] / 4) * (((float)note_tempo) / 100);
 467             }
 468
 469             note_position = 0;
 470         }
 471     }
 472
 473     if (!audio_config.enable) {
 474         playing_notes = false;
 475         playing_note = false;
 476     }
 477 }
 478 #endif
 479
 480 #ifdef B5_AUDIO
 481 ISR(TIMER1_COMPA_vect)
 482 {
 483     #if defined(B5_AUDIO) && !defined(C6_AUDIO)
 484     float freq = 0;
 485
 486     if (playing_note) {
 487         if (voices > 0) {
 488             if (polyphony_rate > 0) {
 489                 if (voices > 1) {
 490                     voice_place %= voices;
 491                     if (place++ > (frequencies[voice_place] / polyphony_rate / CPU_PRESCALER)) {
 492                         voice_place = (voice_place + 1) % voices;
 493                         place = 0.0;
 494                     }
 495                 }
 496
 497                 #ifdef VIBRATO_ENABLE
 498                     if (vibrato_strength > 0) {
 499                         freq = vibrato(frequencies[voice_place]);
 500                     } else {
 501                         freq = frequencies[voice_place];
 502                     }
 503                 #else
 504                     freq = frequencies[voice_place];
 505                 #endif
 506             } else {
 507                 if (glissando) {
 508                     if (frequency != 0 && frequency < frequencies[voices - 1] && frequency < frequencies[voices - 1] * pow(2, -440/frequencies[voices - 1]/12/2)) {
 509                         frequency = frequency * pow(2, 440/frequency/12/2);
 510                     } else if (frequency != 0 && frequency > frequencies[voices - 1] && frequency > frequencies[voices - 1] * pow(2, 440/frequencies[voices - 1]/12/2)) {
 511                         frequency = frequency * pow(2, -440/frequency/12/2);
 512                     } else {
 513                         frequency = frequencies[voices - 1];
 514                     }
 515                 } else {
 516                     frequency = frequencies[voices - 1];
 517                 }
 518
 519                 #ifdef VIBRATO_ENABLE
 520                     if (vibrato_strength > 0) {
 521                         freq = vibrato(frequency);
 522                     } else {
 523                         freq = frequency;
 524                     }
 525                 #else
 526                     freq = frequency;
 527                 #endif
 528             }
 529
 530             if (envelope_index < 65535) {
 531                 envelope_index++;
 532             }
 533
 534             freq = voice_envelope(freq);
 535
 536             if (freq < 30.517578125) {
 537                 freq = 30.52;
 538             }
 539
 540             TIMER_1_PERIOD = (uint16_t)(((float)F_CPU) / (freq * CPU_PRESCALER));
 541             TIMER_1_DUTY_CYCLE = (uint16_t)((((float)F_CPU) / (freq * CPU_PRESCALER)) * note_timbre);
 542         }
 543     }
 544
 545     if (playing_notes) {
 546         if (note_frequency > 0) {
 547             #ifdef VIBRATO_ENABLE
 548                 if (vibrato_strength > 0) {
 549                     freq = vibrato(note_frequency);
 550                 } else {
 551                     freq = note_frequency;
 552                 }
 553             #else
 554                     freq = note_frequency;
 555             #endif
 556
 557             if (envelope_index < 65535) {
 558                 envelope_index++;
 559             }
 560             freq = voice_envelope(freq);
 561
 562             TIMER_1_PERIOD = (uint16_t)(((float)F_CPU) / (freq * CPU_PRESCALER));
 563             TIMER_1_DUTY_CYCLE = (uint16_t)((((float)F_CPU) / (freq * CPU_PRESCALER)) * note_timbre);
 564         } else {
 565             TIMER_1_PERIOD = 0;
 566             TIMER_1_DUTY_CYCLE = 0;
 567         }
 568
 569         note_position++;
 570         bool end_of_note = false;
 571         if (TIMER_1_PERIOD > 0) {
 572             if (!note_resting)
 573                 end_of_note = (note_position >= (note_length / TIMER_1_PERIOD * 0xFFFF - 1));
 574             else
 575                 end_of_note = (note_position >= (note_length));
 576         } else {
 577             end_of_note = (note_position >= (note_length));
 578         }
 579
 580         if (end_of_note) {
 581             current_note++;
 582             if (current_note >= notes_count) {
 583                 if (notes_repeat) {
 584                     current_note = 0;
 585                 } else {
 586                     DISABLE_AUDIO_COUNTER_1_ISR;
 587                     DISABLE_AUDIO_COUNTER_1_OUTPUT;
 588                     playing_notes = false;
 589                     return;
 590                 }
 591             }
 592             if (!note_resting) {
 593                 note_resting = true;
 594                 current_note--;
 595                 if ((*notes_pointer)[current_note][0] == (*notes_pointer)[current_note + 1][0]) {
 596                     note_frequency = 0;
 597                     note_length = 1;
 598                 } else {
 599                     note_frequency = (*notes_pointer)[current_note][0];
 600                     note_length = 1;
 601                 }
 602             } else {
 603                 note_resting = false;
 604                 envelope_index = 0;
 605                 note_frequency = (*notes_pointer)[current_note][0];
 606                 note_length = ((*notes_pointer)[current_note][1] / 4) * (((float)note_tempo) / 100);
 607             }
 608
 609             note_position = 0;
 610         }
 611     }
 612
 613     if (!audio_config.enable) {
 614         playing_notes = false;
 615         playing_note = false;
 616     }
 617 #endif
 618 }
 619 #endif
 620
 621 void play_note(float freq, int vol) {
 622
 623     dprintf("audio play note freq=%d vol=%d", (int)freq, vol);
 624
 625     if (!audio_initialized) {
 626         audio_init();
 627     }
 628
 629     if (audio_config.enable && voices < 8) {
 630         #ifdef C6_AUDIO
 631             DISABLE_AUDIO_COUNTER_3_ISR;
 632         #endif
 633         #ifdef B5_AUDIO
 634             DISABLE_AUDIO_COUNTER_1_ISR;
 635         #endif
 636
 637         // Cancel notes if notes are playing
 638         if (playing_notes)
 639             stop_all_notes();
 640
 641         playing_note = true;
 642
 643         envelope_index = 0;
 644
 645         if (freq > 0) {
 646             frequencies[voices] = freq;
 647             volumes[voices] = vol;
 648             voices++;
 649         }
 650
 651         #ifdef C6_AUDIO
 652             ENABLE_AUDIO_COUNTER_3_ISR;
 653             ENABLE_AUDIO_COUNTER_3_OUTPUT;
 654         #endif
 655         #ifdef B5_AUDIO
 656             #ifdef C6_AUDIO
 657             if (voices > 1) {
 658                 ENABLE_AUDIO_COUNTER_1_ISR;
 659                 ENABLE_AUDIO_COUNTER_1_OUTPUT;
 660             }
 661             #else
 662             ENABLE_AUDIO_COUNTER_1_ISR;
 663             ENABLE_AUDIO_COUNTER_1_OUTPUT;
 664             #endif
 665         #endif
 666     }
 667
 668 }
 669
 670 void play_notes(float (*np)[][2], uint16_t n_count, bool n_repeat)
 671 {
 672
 673     if (!audio_initialized) {
 674         audio_init();
 675     }
 676
 677     if (audio_config.enable) {
 678
 679         #ifdef C6_AUDIO
 680             DISABLE_AUDIO_COUNTER_3_ISR;
 681         #endif
 682         #ifdef B5_AUDIO
 683             DISABLE_AUDIO_COUNTER_1_ISR;
 684         #endif
 685
 686         // Cancel note if a note is playing
 687         if (playing_note)
 688             stop_all_notes();
 689
 690         playing_notes = true;
 691
 692         notes_pointer = np;
 693         notes_count = n_count;
 694         notes_repeat = n_repeat;
 695
 696         place = 0;
 697         current_note = 0;
 698
 699         note_frequency = (*notes_pointer)[current_note][0];
 700         note_length = ((*notes_pointer)[current_note][1] / 4) * (((float)note_tempo) / 100);
 701         note_position = 0;
 702
 703
 704         #ifdef C6_AUDIO
 705             ENABLE_AUDIO_COUNTER_3_ISR;
 706             ENABLE_AUDIO_COUNTER_3_OUTPUT;
 707         #endif
 708         #ifdef B5_AUDIO
 709             #ifndef C6_AUDIO
 710             ENABLE_AUDIO_COUNTER_1_ISR;
 711             ENABLE_AUDIO_COUNTER_1_OUTPUT;
 712             #endif
 713         #endif
 714     }
 715
 716 }
 717
 718 bool is_playing_notes(void) {
 719     return playing_notes;
 720 }
 721
 722 bool is_audio_on(void) {
 723     return (audio_config.enable != 0);
 724 }
 725
 726 void audio_toggle(void) {
 727     audio_config.enable ^= 1;
 728     eeconfig_update_audio(audio_config.raw);
 729     if (audio_config.enable)
 730         audio_on_user();
 731 }
 732
 733 void audio_on(void) {
 734     audio_config.enable = 1;
 735     eeconfig_update_audio(audio_config.raw);
 736     audio_on_user();
 737     PLAY_SONG(audio_on_song);
 738 }
 739
 740 void audio_off(void) {
 741     PLAY_SONG(audio_off_song);
 742     wait_ms(100);
 743     stop_all_notes();
 744     audio_config.enable = 0;
 745     eeconfig_update_audio(audio_config.raw);
 746 }
 747
 748 #ifdef VIBRATO_ENABLE
 749
 750 // Vibrato rate functions
 751
 752 void set_vibrato_rate(float rate) {
 753     vibrato_rate = rate;
 754 }
 755
 756 void increase_vibrato_rate(float change) {
 757     vibrato_rate *= change;
 758 }
 759
 760 void decrease_vibrato_rate(float change) {
 761     vibrato_rate /= change;
 762 }
 763
 764 #ifdef VIBRATO_STRENGTH_ENABLE
 765
 766 void set_vibrato_strength(float strength) {
 767     vibrato_strength = strength;
 768 }
 769
 770 void increase_vibrato_strength(float change) {
 771     vibrato_strength *= change;
 772 }
 773
 774 void decrease_vibrato_strength(float change) {
 775     vibrato_strength /= change;
 776 }
 777
 778 #endif  /* VIBRATO_STRENGTH_ENABLE */
 779
 780 #endif /* VIBRATO_ENABLE */
 781
 782 // Polyphony functions
 783
 784 void set_polyphony_rate(float rate) {
 785     polyphony_rate = rate;
 786 }
 787
 788 void enable_polyphony() {
 789     polyphony_rate = 5;
 790 }
 791
 792 void disable_polyphony() {
 793     polyphony_rate = 0;
 794 }
 795
 796 void increase_polyphony_rate(float change) {
 797     polyphony_rate *= change;
 798 }
 799
 800 void decrease_polyphony_rate(float change) {
 801     polyphony_rate /= change;
 802 }
 803
 804 // Timbre function
 805
 806 void set_timbre(float timbre) {
 807     note_timbre = timbre;
 808 }
 809
 810 // Tempo functions
 811
 812 void set_tempo(uint8_t tempo) {
 813     note_tempo = tempo;
 814 }
 815
 816 void decrease_tempo(uint8_t tempo_change) {
 817     note_tempo += tempo_change;
 818 }
 819
 820 void increase_tempo(uint8_t tempo_change) {
 821     if (note_tempo - tempo_change < 10) {
 822         note_tempo = 10;
 823     } else {
 824         note_tempo -= tempo_change;
 825     }
 826 }