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);
 156             PORTC &= ~_BV(PORTC6);
 157         #endif
 158
 159         #ifdef B5_AUDIO
 160             DDRB |= _BV(PORTB5);
 161         #else
 162             DDRB |= _BV(PORTB5);
 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         #endif
 188
 189         audio_initialized = true;
 190     }
 191
 192     if (audio_config.enable) {
 193         PLAY_SONG(startup_song);
 194     }
 195
 196 }
 197
 198 void stop_all_notes()
 199 {
 200     dprintf("audio stop all notes");
 201
 202     if (!audio_initialized) {
 203         audio_init();
 204     }
 205     voices = 0;
 206
 207
 208     #ifdef C6_AUDIO
 209         DISABLE_AUDIO_COUNTER_3_ISR;
 210         DISABLE_AUDIO_COUNTER_3_OUTPUT;
 211     #endif
 212
 213     #ifdef B5_AUDIO
 214         DISABLE_AUDIO_COUNTER_1_ISR;
 215         DISABLE_AUDIO_COUNTER_1_OUTPUT;
 216     #endif
 217
 218     playing_notes = false;
 219     playing_note = false;
 220     frequency = 0;
 221     frequency_alt = 0;
 222     volume = 0;
 223
 224     for (uint8_t i = 0; i < 8; i++)
 225     {
 226         frequencies[i] = 0;
 227         volumes[i] = 0;
 228     }
 229 }
 230
 231 void stop_note(float freq)
 232 {
 233     dprintf("audio stop note freq=%d", (int)freq);
 234
 235     if (playing_note) {
 236         if (!audio_initialized) {
 237             audio_init();
 238         }
 239         for (int i = 7; i >= 0; i--) {
 240             if (frequencies[i] == freq) {
 241                 frequencies[i] = 0;
 242                 volumes[i] = 0;
 243                 for (int j = i; (j < 7); j++) {
 244                     frequencies[j] = frequencies[j+1];
 245                     frequencies[j+1] = 0;
 246                     volumes[j] = volumes[j+1];
 247                     volumes[j+1] = 0;
 248                 }
 249                 break;
 250             }
 251         }
 252         voices--;
 253         if (voices < 0)
 254             voices = 0;
 255         if (voice_place >= voices) {
 256             voice_place = 0;
 257         }
 258         if (voices == 0) {
 259             #ifdef C6_AUDIO
 260                 DISABLE_AUDIO_COUNTER_3_ISR;
 261                 DISABLE_AUDIO_COUNTER_3_OUTPUT;
 262             #endif
 263             #ifdef B5_AUDIO
 264                 DISABLE_AUDIO_COUNTER_1_ISR;
 265                 DISABLE_AUDIO_COUNTER_1_OUTPUT;
 266             #endif
 267             frequency = 0;
 268             frequency_alt = 0;
 269             volume = 0;
 270             playing_note = false;
 271         }
 272     }
 273 }
 274
 275 #ifdef VIBRATO_ENABLE
 276
 277 float mod(float a, int b)
 278 {
 279     float r = fmod(a, b);
 280     return r < 0 ? r + b : r;
 281 }
 282
 283 float vibrato(float average_freq) {
 284     #ifdef VIBRATO_STRENGTH_ENABLE
 285         float vibrated_freq = average_freq * pow(vibrato_lut[(int)vibrato_counter], vibrato_strength);
 286     #else
 287         float vibrated_freq = average_freq * vibrato_lut[(int)vibrato_counter];
 288     #endif
 289     vibrato_counter = mod((vibrato_counter + vibrato_rate * (1.0 + 440.0/average_freq)), VIBRATO_LUT_LENGTH);
 290     return vibrated_freq;
 291 }
 292
 293 #endif
 294
 295 #ifdef C6_AUDIO
 296 ISR(TIMER3_COMPA_vect)
 297 {
 298     float freq;
 299
 300     if (playing_note) {
 301         if (voices > 0) {
 302
 303             #ifdef B5_AUDIO
 304             float freq_alt = 0;
 305                 if (voices > 1) {
 306                     if (polyphony_rate == 0) {
 307                         if (glissando) {
 308                             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 if (frequency_alt != 0 && frequency_alt > frequencies[voices - 2] && frequency_alt > frequencies[voices - 2] * pow(2, 440/frequencies[voices - 2]/12/2)) {
 311                                 frequency_alt = frequency_alt * pow(2, -440/frequency_alt/12/2);
 312                             } else {
 313                                 frequency_alt = frequencies[voices - 2];
 314                             }
 315                         } else {
 316                             frequency_alt = frequencies[voices - 2];
 317                         }
 318
 319                         #ifdef VIBRATO_ENABLE
 320                             if (vibrato_strength > 0) {
 321                                 freq_alt = vibrato(frequency_alt);
 322                             } else {
 323                                 freq_alt = frequency_alt;
 324                             }
 325                         #else
 326                             freq_alt = frequency_alt;
 327                         #endif
 328                     }
 329
 330                     if (envelope_index < 65535) {
 331                         envelope_index++;
 332                     }
 333
 334                     freq_alt = voice_envelope(freq_alt);
 335
 336                     if (freq_alt < 30.517578125) {
 337                         freq_alt = 30.52;
 338                     }
 339
 340                     TIMER_1_PERIOD = (uint16_t)(((float)F_CPU) / (freq_alt * CPU_PRESCALER));
 341                     TIMER_1_DUTY_CYCLE = (uint16_t)((((float)F_CPU) / (freq_alt * CPU_PRESCALER)) * note_timbre);
 342                 }
 343             #endif
 344
 345             if (polyphony_rate > 0) {
 346                 if (voices > 1) {
 347                     voice_place %= voices;
 348                     if (place++ > (frequencies[voice_place] / polyphony_rate / CPU_PRESCALER)) {
 349                         voice_place = (voice_place + 1) % voices;
 350                         place = 0.0;
 351                     }
 352                 }
 353
 354                 #ifdef VIBRATO_ENABLE
 355                     if (vibrato_strength > 0) {
 356                         freq = vibrato(frequencies[voice_place]);
 357                     } else {
 358                         freq = frequencies[voice_place];
 359                     }
 360                 #else
 361                     freq = frequencies[voice_place];
 362                 #endif
 363             } else {
 364                 if (glissando) {
 365                     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 if (frequency != 0 && frequency > frequencies[voices - 1] && frequency > frequencies[voices - 1] * pow(2, 440/frequencies[voices - 1]/12/2)) {
 368                         frequency = frequency * pow(2, -440/frequency/12/2);
 369                     } else {
 370                         frequency = frequencies[voices - 1];
 371                     }
 372                 } else {
 373                     frequency = frequencies[voices - 1];
 374                 }
 375
 376                 #ifdef VIBRATO_ENABLE
 377                     if (vibrato_strength > 0) {
 378                         freq = vibrato(frequency);
 379                     } else {
 380                         freq = frequency;
 381                     }
 382                 #else
 383                     freq = frequency;
 384                 #endif
 385             }
 386
 387             if (envelope_index < 65535) {
 388                 envelope_index++;
 389             }
 390
 391             freq = voice_envelope(freq);
 392
 393             if (freq < 30.517578125) {
 394                 freq = 30.52;
 395             }
 396
 397             TIMER_3_PERIOD = (uint16_t)(((float)F_CPU) / (freq * CPU_PRESCALER));
 398             TIMER_3_DUTY_CYCLE = (uint16_t)((((float)F_CPU) / (freq * CPU_PRESCALER)) * note_timbre);
 399         }
 400     }
 401
 402     if (playing_notes) {
 403         if (note_frequency > 0) {
 404             #ifdef VIBRATO_ENABLE
 405                 if (vibrato_strength > 0) {
 406                     freq = vibrato(note_frequency);
 407                 } else {
 408                     freq = note_frequency;
 409                 }
 410             #else
 411                     freq = note_frequency;
 412             #endif
 413
 414             if (envelope_index < 65535) {
 415                 envelope_index++;
 416             }
 417             freq = voice_envelope(freq);
 418
 419             TIMER_3_PERIOD = (uint16_t)(((float)F_CPU) / (freq * CPU_PRESCALER));
 420             TIMER_3_DUTY_CYCLE = (uint16_t)((((float)F_CPU) / (freq * CPU_PRESCALER)) * note_timbre);
 421         } else {
 422             TIMER_3_PERIOD = 0;
 423             TIMER_3_DUTY_CYCLE = 0;
 424         }
 425
 426         note_position++;
 427         bool end_of_note = false;
 428         if (TIMER_3_PERIOD > 0) {
 429             if (!note_resting)
 430                 end_of_note = (note_position >= (note_length / TIMER_3_PERIOD * 0xFFFF - 1));
 431             else
 432                 end_of_note = (note_position >= (note_length));
 433         } else {
 434             end_of_note = (note_position >= (note_length));
 435         }
 436
 437         if (end_of_note) {
 438             current_note++;
 439             if (current_note >= notes_count) {
 440                 if (notes_repeat) {
 441                     current_note = 0;
 442                 } else {
 443                     DISABLE_AUDIO_COUNTER_3_ISR;
 444                     DISABLE_AUDIO_COUNTER_3_OUTPUT;
 445                     playing_notes = false;
 446                     return;
 447                 }
 448             }
 449             if (!note_resting) {
 450                 note_resting = true;
 451                 current_note--;
 452                 if ((*notes_pointer)[current_note][0] == (*notes_pointer)[current_note + 1][0]) {
 453                     note_frequency = 0;
 454                     note_length = 1;
 455                 } else {
 456                     note_frequency = (*notes_pointer)[current_note][0];
 457                     note_length = 1;
 458                 }
 459             } else {
 460                 note_resting = false;
 461                 envelope_index = 0;
 462                 note_frequency = (*notes_pointer)[current_note][0];
 463                 note_length = ((*notes_pointer)[current_note][1] / 4) * (((float)note_tempo) / 100);
 464             }
 465
 466             note_position = 0;
 467         }
 468     }
 469
 470     if (!audio_config.enable) {
 471         playing_notes = false;
 472         playing_note = false;
 473     }
 474 }
 475 #endif
 476
 477 #ifdef B5_AUDIO
 478 ISR(TIMER1_COMPA_vect)
 479 {
 480     #if defined(B5_AUDIO) && !defined(C6_AUDIO)
 481     float freq = 0;
 482
 483     if (playing_note) {
 484         if (voices > 0) {
 485             if (polyphony_rate > 0) {
 486                 if (voices > 1) {
 487                     voice_place %= voices;
 488                     if (place++ > (frequencies[voice_place] / polyphony_rate / CPU_PRESCALER)) {
 489                         voice_place = (voice_place + 1) % voices;
 490                         place = 0.0;
 491                     }
 492                 }
 493
 494                 #ifdef VIBRATO_ENABLE
 495                     if (vibrato_strength > 0) {
 496                         freq = vibrato(frequencies[voice_place]);
 497                     } else {
 498                         freq = frequencies[voice_place];
 499                     }
 500                 #else
 501                     freq = frequencies[voice_place];
 502                 #endif
 503             } else {
 504                 if (glissando) {
 505                     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 if (frequency != 0 && frequency > frequencies[voices - 1] && frequency > frequencies[voices - 1] * pow(2, 440/frequencies[voices - 1]/12/2)) {
 508                         frequency = frequency * pow(2, -440/frequency/12/2);
 509                     } else {
 510                         frequency = frequencies[voices - 1];
 511                     }
 512                 } else {
 513                     frequency = frequencies[voices - 1];
 514                 }
 515
 516                 #ifdef VIBRATO_ENABLE
 517                     if (vibrato_strength > 0) {
 518                         freq = vibrato(frequency);
 519                     } else {
 520                         freq = frequency;
 521                     }
 522                 #else
 523                     freq = frequency;
 524                 #endif
 525             }
 526
 527             if (envelope_index < 65535) {
 528                 envelope_index++;
 529             }
 530
 531             freq = voice_envelope(freq);
 532
 533             if (freq < 30.517578125) {
 534                 freq = 30.52;
 535             }
 536
 537             TIMER_1_PERIOD = (uint16_t)(((float)F_CPU) / (freq * CPU_PRESCALER));
 538             TIMER_1_DUTY_CYCLE = (uint16_t)((((float)F_CPU) / (freq * CPU_PRESCALER)) * note_timbre);
 539         }
 540     }
 541
 542     if (playing_notes) {
 543         if (note_frequency > 0) {
 544             #ifdef VIBRATO_ENABLE
 545                 if (vibrato_strength > 0) {
 546                     freq = vibrato(note_frequency);
 547                 } else {
 548                     freq = note_frequency;
 549                 }
 550             #else
 551                     freq = note_frequency;
 552             #endif
 553
 554             if (envelope_index < 65535) {
 555                 envelope_index++;
 556             }
 557             freq = voice_envelope(freq);
 558
 559             TIMER_1_PERIOD = (uint16_t)(((float)F_CPU) / (freq * CPU_PRESCALER));
 560             TIMER_1_DUTY_CYCLE = (uint16_t)((((float)F_CPU) / (freq * CPU_PRESCALER)) * note_timbre);
 561         } else {
 562             TIMER_1_PERIOD = 0;
 563             TIMER_1_DUTY_CYCLE = 0;
 564         }
 565
 566         note_position++;
 567         bool end_of_note = false;
 568         if (TIMER_1_PERIOD > 0) {
 569             if (!note_resting)
 570                 end_of_note = (note_position >= (note_length / TIMER_1_PERIOD * 0xFFFF - 1));
 571             else
 572                 end_of_note = (note_position >= (note_length));
 573         } else {
 574             end_of_note = (note_position >= (note_length));
 575         }
 576
 577         if (end_of_note) {
 578             current_note++;
 579             if (current_note >= notes_count) {
 580                 if (notes_repeat) {
 581                     current_note = 0;
 582                 } else {
 583                     DISABLE_AUDIO_COUNTER_1_ISR;
 584                     DISABLE_AUDIO_COUNTER_1_OUTPUT;
 585                     playing_notes = false;
 586                     return;
 587                 }
 588             }
 589             if (!note_resting) {
 590                 note_resting = true;
 591                 current_note--;
 592                 if ((*notes_pointer)[current_note][0] == (*notes_pointer)[current_note + 1][0]) {
 593                     note_frequency = 0;
 594                     note_length = 1;
 595                 } else {
 596                     note_frequency = (*notes_pointer)[current_note][0];
 597                     note_length = 1;
 598                 }
 599             } else {
 600                 note_resting = false;
 601                 envelope_index = 0;
 602                 note_frequency = (*notes_pointer)[current_note][0];
 603                 note_length = ((*notes_pointer)[current_note][1] / 4) * (((float)note_tempo) / 100);
 604             }
 605
 606             note_position = 0;
 607         }
 608     }
 609
 610     if (!audio_config.enable) {
 611         playing_notes = false;
 612         playing_note = false;
 613     }
 614 #endif
 615 }
 616 #endif
 617
 618 void play_note(float freq, int vol) {
 619
 620     dprintf("audio play note freq=%d vol=%d", (int)freq, vol);
 621
 622     if (!audio_initialized) {
 623         audio_init();
 624     }
 625
 626     if (audio_config.enable && voices < 8) {
 627         #ifdef C6_AUDIO
 628             DISABLE_AUDIO_COUNTER_3_ISR;
 629         #endif
 630         #ifdef B5_AUDIO
 631             DISABLE_AUDIO_COUNTER_1_ISR;
 632         #endif
 633
 634         // Cancel notes if notes are playing
 635         if (playing_notes)
 636             stop_all_notes();
 637
 638         playing_note = true;
 639
 640         envelope_index = 0;
 641
 642         if (freq > 0) {
 643             frequencies[voices] = freq;
 644             volumes[voices] = vol;
 645             voices++;
 646         }
 647
 648         #ifdef C6_AUDIO
 649             ENABLE_AUDIO_COUNTER_3_ISR;
 650             ENABLE_AUDIO_COUNTER_3_OUTPUT;
 651         #endif
 652         #ifdef B5_AUDIO
 653             #ifdef C6_AUDIO
 654             if (voices > 1) {
 655                 ENABLE_AUDIO_COUNTER_1_ISR;
 656                 ENABLE_AUDIO_COUNTER_1_OUTPUT;
 657             }
 658             #else
 659             ENABLE_AUDIO_COUNTER_1_ISR;
 660             ENABLE_AUDIO_COUNTER_1_OUTPUT;
 661             #endif
 662         #endif
 663     }
 664
 665 }
 666
 667 void play_notes(float (*np)[][2], uint16_t n_count, bool n_repeat)
 668 {
 669
 670     if (!audio_initialized) {
 671         audio_init();
 672     }
 673
 674     if (audio_config.enable) {
 675
 676         #ifdef C6_AUDIO
 677             DISABLE_AUDIO_COUNTER_3_ISR;
 678         #endif
 679         #ifdef B5_AUDIO
 680             DISABLE_AUDIO_COUNTER_1_ISR;
 681         #endif
 682
 683         // Cancel note if a note is playing
 684         if (playing_note)
 685             stop_all_notes();
 686
 687         playing_notes = true;
 688
 689         notes_pointer = np;
 690         notes_count = n_count;
 691         notes_repeat = n_repeat;
 692
 693         place = 0;
 694         current_note = 0;
 695
 696         note_frequency = (*notes_pointer)[current_note][0];
 697         note_length = ((*notes_pointer)[current_note][1] / 4) * (((float)note_tempo) / 100);
 698         note_position = 0;
 699
 700
 701         #ifdef C6_AUDIO
 702             ENABLE_AUDIO_COUNTER_3_ISR;
 703             ENABLE_AUDIO_COUNTER_3_OUTPUT;
 704         #endif
 705         #ifdef B5_AUDIO
 706             #ifndef C6_AUDIO
 707             ENABLE_AUDIO_COUNTER_1_ISR;
 708             ENABLE_AUDIO_COUNTER_1_OUTPUT;
 709             #endif
 710         #endif
 711     }
 712
 713 }
 714
 715 bool is_playing_notes(void) {
 716     return playing_notes;
 717 }
 718
 719 bool is_audio_on(void) {
 720     return (audio_config.enable != 0);
 721 }
 722
 723 void audio_toggle(void) {
 724     audio_config.enable ^= 1;
 725     eeconfig_update_audio(audio_config.raw);
 726     if (audio_config.enable)
 727         audio_on_user();
 728 }
 729
 730 void audio_on(void) {
 731     audio_config.enable = 1;
 732     eeconfig_update_audio(audio_config.raw);
 733     audio_on_user();
 734     PLAY_SONG(audio_on_song);
 735 }
 736
 737 void audio_off(void) {
 738     PLAY_SONG(audio_off_song);
 739     wait_ms(100);
 740     stop_all_notes();
 741     audio_config.enable = 0;
 742     eeconfig_update_audio(audio_config.raw);
 743 }
 744
 745 #ifdef VIBRATO_ENABLE
 746
 747 // Vibrato rate functions
 748
 749 void set_vibrato_rate(float rate) {
 750     vibrato_rate = rate;
 751 }
 752
 753 void increase_vibrato_rate(float change) {
 754     vibrato_rate *= change;
 755 }
 756
 757 void decrease_vibrato_rate(float change) {
 758     vibrato_rate /= change;
 759 }
 760
 761 #ifdef VIBRATO_STRENGTH_ENABLE
 762
 763 void set_vibrato_strength(float strength) {
 764     vibrato_strength = strength;
 765 }
 766
 767 void increase_vibrato_strength(float change) {
 768     vibrato_strength *= change;
 769 }
 770
 771 void decrease_vibrato_strength(float change) {
 772     vibrato_strength /= change;
 773 }
 774
 775 #endif  /* VIBRATO_STRENGTH_ENABLE */
 776
 777 #endif /* VIBRATO_ENABLE */
 778
 779 // Polyphony functions
 780
 781 void set_polyphony_rate(float rate) {
 782     polyphony_rate = rate;
 783 }
 784
 785 void enable_polyphony() {
 786     polyphony_rate = 5;
 787 }
 788
 789 void disable_polyphony() {
 790     polyphony_rate = 0;
 791 }
 792
 793 void increase_polyphony_rate(float change) {
 794     polyphony_rate *= change;
 795 }
 796
 797 void decrease_polyphony_rate(float change) {
 798     polyphony_rate /= change;
 799 }
 800
 801 // Timbre function
 802
 803 void set_timbre(float timbre) {
 804     note_timbre = timbre;
 805 }
 806
 807 // Tempo functions
 808
 809 void set_tempo(uint8_t tempo) {
 810     note_tempo = tempo;
 811 }
 812
 813 void decrease_tempo(uint8_t tempo_change) {
 814     note_tempo += tempo_change;
 815 }
 816
 817 void increase_tempo(uint8_t tempo_change) {
 818     if (note_tempo - tempo_change < 10) {
 819         note_tempo = 10;
 820     } else {
 821         note_tempo -= tempo_change;
 822     }
 823 }