diff options
Diffstat (limited to 'quantum/audio/audio_pwm.c')
| -rw-r--r-- | quantum/audio/audio_pwm.c | 595 |
1 files changed, 0 insertions, 595 deletions
diff --git a/quantum/audio/audio_pwm.c b/quantum/audio/audio_pwm.c deleted file mode 100644 index 545aef6dd7..0000000000 --- a/quantum/audio/audio_pwm.c +++ /dev/null @@ -1,595 +0,0 @@ -/* Copyright 2016 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 <stdio.h> -#include <string.h> -//#include <math.h> -#include <avr/pgmspace.h> -#include <avr/interrupt.h> -#include <avr/io.h> -#include "print.h" -#include "audio.h" -#include "keymap.h" - -#include "eeconfig.h" - -#define PI 3.14159265 - -#define CPU_PRESCALER 8 - -// Timer Abstractions - -// TIMSK3 - Timer/Counter #3 Interrupt Mask Register -// Turn on/off 3A interputs, stopping/enabling the ISR calls -#define ENABLE_AUDIO_COUNTER_3_ISR TIMSK3 |= _BV(OCIE3A) -#define DISABLE_AUDIO_COUNTER_3_ISR TIMSK3 &= ~_BV(OCIE3A) - -// TCCR3A: Timer/Counter #3 Control Register -// Compare Output Mode (COM3An) = 0b00 = Normal port operation, OC3A disconnected from PC6 -#define ENABLE_AUDIO_COUNTER_3_OUTPUT TCCR3A |= _BV(COM3A1); -#define DISABLE_AUDIO_COUNTER_3_OUTPUT TCCR3A &= ~(_BV(COM3A1) | _BV(COM3A0)); - -#define NOTE_PERIOD ICR3 -#define NOTE_DUTY_CYCLE OCR3A - -#ifdef PWM_AUDIO -# include "wave.h" -# define SAMPLE_DIVIDER 39 -# define SAMPLE_RATE (2000000.0 / SAMPLE_DIVIDER / 2048) -// Resistor value of 1/ (2 * PI * 10nF * (2000000 hertz / SAMPLE_DIVIDER / 10)) for 10nF cap - -float places[8] = {0, 0, 0, 0, 0, 0, 0, 0}; -uint16_t place_int = 0; -bool repeat = true; -#endif - -void delay_us(int count) { - while (count--) { - _delay_us(1); - } -} - -int voices = 0; -int voice_place = 0; -float frequency = 0; -int volume = 0; -long position = 0; - -float frequencies[8] = {0, 0, 0, 0, 0, 0, 0, 0}; -int volumes[8] = {0, 0, 0, 0, 0, 0, 0, 0}; -bool sliding = false; - -float place = 0; - -uint8_t* sample; -uint16_t sample_length = 0; -// float freq = 0; - -bool playing_notes = false; -bool playing_note = false; -float note_frequency = 0; -float note_length = 0; -uint8_t note_tempo = TEMPO_DEFAULT; -float note_timbre = TIMBRE_DEFAULT; -uint16_t note_position = 0; -float (*notes_pointer)[][2]; -uint16_t notes_count; -bool notes_repeat; -float notes_rest; -bool note_resting = false; - -uint16_t current_note = 0; -uint8_t rest_counter = 0; - -#ifdef VIBRATO_ENABLE -float vibrato_counter = 0; -float vibrato_strength = .5; -float vibrato_rate = 0.125; -#endif - -float polyphony_rate = 0; - -static bool audio_initialized = false; - -audio_config_t audio_config; - -uint16_t envelope_index = 0; - -void audio_init() { - // Check EEPROM - if (!eeconfig_is_enabled()) { - eeconfig_init(); - } - audio_config.raw = eeconfig_read_audio(); - -#ifdef PWM_AUDIO - - PLLFRQ = _BV(PDIV2); - PLLCSR = _BV(PLLE); - while (!(PLLCSR & _BV(PLOCK))) - ; - PLLFRQ |= _BV(PLLTM0); /* PCK 48MHz */ - - /* Init a fast PWM on Timer4 */ - TCCR4A = _BV(COM4A0) | _BV(PWM4A); /* Clear OC4A on Compare Match */ - TCCR4B = _BV(CS40); /* No prescaling => f = PCK/256 = 187500Hz */ - OCR4A = 0; - - /* Enable the OC4A output */ - DDRC |= _BV(PORTC6); - - DISABLE_AUDIO_COUNTER_3_ISR; // Turn off 3A interputs - - TCCR3A = 0x0; // Options not needed - TCCR3B = _BV(CS31) | _BV(CS30) | _BV(WGM32); // 64th prescaling and CTC - OCR3A = SAMPLE_DIVIDER - 1; // Correct count/compare, related to sample playback - -#else - - // Set port PC6 (OC3A and /OC4A) as output - DDRC |= _BV(PORTC6); - - DISABLE_AUDIO_COUNTER_3_ISR; - - // TCCR3A / TCCR3B: Timer/Counter #3 Control Registers - // Compare Output Mode (COM3An) = 0b00 = Normal port operation, OC3A disconnected from PC6 - // Waveform Generation Mode (WGM3n) = 0b1110 = Fast PWM Mode 14 (Period = ICR3, Duty Cycle = OCR3A) - // Clock Select (CS3n) = 0b010 = Clock / 8 - TCCR3A = (0 << COM3A1) | (0 << COM3A0) | (1 << WGM31) | (0 << WGM30); - TCCR3B = (1 << WGM33) | (1 << WGM32) | (0 << CS32) | (1 << CS31) | (0 << CS30); - -#endif - - audio_initialized = true; -} - -void stop_all_notes() { - if (!audio_initialized) { - audio_init(); - } - voices = 0; -#ifdef PWM_AUDIO - DISABLE_AUDIO_COUNTER_3_ISR; -#else - DISABLE_AUDIO_COUNTER_3_ISR; - DISABLE_AUDIO_COUNTER_3_OUTPUT; -#endif - - playing_notes = false; - playing_note = false; - frequency = 0; - volume = 0; - - for (uint8_t i = 0; i < 8; i++) { - frequencies[i] = 0; - volumes[i] = 0; - } -} - -void stop_note(float freq) { - if (playing_note) { - if (!audio_initialized) { - audio_init(); - } -#ifdef PWM_AUDIO - freq = freq / SAMPLE_RATE; -#endif - for (int i = 7; i >= 0; i--) { - if (frequencies[i] == freq) { - frequencies[i] = 0; - volumes[i] = 0; - for (int j = i; (j < 7); j++) { - frequencies[j] = frequencies[j + 1]; - frequencies[j + 1] = 0; - volumes[j] = volumes[j + 1]; - volumes[j + 1] = 0; - } - break; - } - } - voices--; - if (voices < 0) voices = 0; - if (voice_place >= voices) { - voice_place = 0; - } - if (voices == 0) { -#ifdef PWM_AUDIO - DISABLE_AUDIO_COUNTER_3_ISR; -#else - DISABLE_AUDIO_COUNTER_3_ISR; - DISABLE_AUDIO_COUNTER_3_OUTPUT; -#endif - frequency = 0; - volume = 0; - playing_note = false; - } - } -} - -#ifdef VIBRATO_ENABLE - -float mod(float a, int b) { - float r = fmod(a, b); - return r < 0 ? r + b : r; -} - -float vibrato(float average_freq) { -# ifdef VIBRATO_STRENGTH_ENABLE - float vibrated_freq = average_freq * pow(vibrato_lut[(int)vibrato_counter], vibrato_strength); -# else - float vibrated_freq = average_freq * vibrato_lut[(int)vibrato_counter]; -# endif - vibrato_counter = mod((vibrato_counter + vibrato_rate * (1.0 + 440.0 / average_freq)), VIBRATO_LUT_LENGTH); - return vibrated_freq; -} - -#endif - -ISR(TIMER3_COMPA_vect) { - if (playing_note) { -#ifdef PWM_AUDIO - if (voices == 1) { - // SINE - OCR4A = pgm_read_byte(&sinewave[(uint16_t)place]) >> 2; - - // SQUARE - // if (((int)place) >= 1024){ - // OCR4A = 0xFF >> 2; - // } else { - // OCR4A = 0x00; - // } - - // SAWTOOTH - // OCR4A = (int)place / 4; - - // TRIANGLE - // if (((int)place) >= 1024) { - // OCR4A = (int)place / 2; - // } else { - // OCR4A = 2048 - (int)place / 2; - // } - - place += frequency; - - if (place >= SINE_LENGTH) place -= SINE_LENGTH; - - } else { - int sum = 0; - for (int i = 0; i < voices; i++) { - // SINE - sum += pgm_read_byte(&sinewave[(uint16_t)places[i]]) >> 2; - - // SQUARE - // if (((int)places[i]) >= 1024){ - // sum += 0xFF >> 2; - // } else { - // sum += 0x00; - // } - - places[i] += frequencies[i]; - - if (places[i] >= SINE_LENGTH) places[i] -= SINE_LENGTH; - } - OCR4A = sum; - } -#else - if (voices > 0) { - float freq; - if (polyphony_rate > 0) { - if (voices > 1) { - voice_place %= voices; - if (place++ > (frequencies[voice_place] / polyphony_rate / CPU_PRESCALER)) { - voice_place = (voice_place + 1) % voices; - place = 0.0; - } - } -# ifdef VIBRATO_ENABLE - if (vibrato_strength > 0) { - freq = vibrato(frequencies[voice_place]); - } else { -# else - { -# endif - freq = frequencies[voice_place]; - } - } else { - 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)) { - frequency = frequency * pow(2, -440 / frequency / 12 / 2); - } else { - frequency = frequencies[voices - 1]; - } - -# ifdef VIBRATO_ENABLE - if (vibrato_strength > 0) { - freq = vibrato(frequency); - } else { -# else - { -# endif - freq = frequency; - } - } - - if (envelope_index < 65535) { - envelope_index++; - } - freq = voice_envelope(freq); - - if (freq < 30.517578125) freq = 30.52; - NOTE_PERIOD = (int)(((double)F_CPU) / (freq * CPU_PRESCALER)); // Set max to the period - NOTE_DUTY_CYCLE = (int)((((double)F_CPU) / (freq * CPU_PRESCALER)) * note_timbre); // Set compare to half the period - } -#endif - } - - // SAMPLE - // OCR4A = pgm_read_byte(&sample[(uint16_t)place_int]); - - // place_int++; - - // if (place_int >= sample_length) - // if (repeat) - // place_int -= sample_length; - // else - // DISABLE_AUDIO_COUNTER_3_ISR; - - if (playing_notes) { -#ifdef PWM_AUDIO - OCR4A = pgm_read_byte(&sinewave[(uint16_t)place]) >> 0; - - place += note_frequency; - if (place >= SINE_LENGTH) place -= SINE_LENGTH; -#else - if (note_frequency > 0) { - float freq; - -# ifdef VIBRATO_ENABLE - if (vibrato_strength > 0) { - freq = vibrato(note_frequency); - } else { -# else - { -# endif - freq = note_frequency; - } - - if (envelope_index < 65535) { - envelope_index++; - } - freq = voice_envelope(freq); - - NOTE_PERIOD = (int)(((double)F_CPU) / (freq * CPU_PRESCALER)); // Set max to the period - NOTE_DUTY_CYCLE = (int)((((double)F_CPU) / (freq * CPU_PRESCALER)) * note_timbre); // Set compare to half the period - } else { - NOTE_PERIOD = 0; - NOTE_DUTY_CYCLE = 0; - } -#endif - - note_position++; - bool end_of_note = false; - if (NOTE_PERIOD > 0) - end_of_note = (note_position >= (note_length / NOTE_PERIOD * 0xFFFF)); - else - end_of_note = (note_position >= (note_length * 0x7FF)); - if (end_of_note) { - current_note++; - if (current_note >= notes_count) { - if (notes_repeat) { - current_note = 0; - } else { -#ifdef PWM_AUDIO - DISABLE_AUDIO_COUNTER_3_ISR; -#else - DISABLE_AUDIO_COUNTER_3_ISR; - DISABLE_AUDIO_COUNTER_3_OUTPUT; -#endif - playing_notes = false; - return; - } - } - if (!note_resting && (notes_rest > 0)) { - note_resting = true; - note_frequency = 0; - note_length = notes_rest; - current_note--; - } else { - note_resting = false; -#ifdef PWM_AUDIO - note_frequency = (*notes_pointer)[current_note][0] / SAMPLE_RATE; - note_length = (*notes_pointer)[current_note][1] * (((float)note_tempo) / 100); -#else - envelope_index = 0; - note_frequency = (*notes_pointer)[current_note][0]; - note_length = ((*notes_pointer)[current_note][1] / 4) * (((float)note_tempo) / 100); -#endif - } - note_position = 0; - } - } - - if (!audio_config.enable) { - playing_notes = false; - playing_note = false; - } -} - -void play_note(float freq, int vol) { - if (!audio_initialized) { - audio_init(); - } - - if (audio_config.enable && voices < 8) { - DISABLE_AUDIO_COUNTER_3_ISR; - - // Cancel notes if notes are playing - if (playing_notes) stop_all_notes(); - - playing_note = true; - - envelope_index = 0; - -#ifdef PWM_AUDIO - freq = freq / SAMPLE_RATE; -#endif - if (freq > 0) { - frequencies[voices] = freq; - volumes[voices] = vol; - voices++; - } - -#ifdef PWM_AUDIO - ENABLE_AUDIO_COUNTER_3_ISR; -#else - ENABLE_AUDIO_COUNTER_3_ISR; - ENABLE_AUDIO_COUNTER_3_OUTPUT; -#endif - } -} - -void play_notes(float (*np)[][2], uint16_t n_count, bool n_repeat, float n_rest) { - if (!audio_initialized) { - audio_init(); - } - - if (audio_config.enable) { - DISABLE_AUDIO_COUNTER_3_ISR; - - // Cancel note if a note is playing - if (playing_note) stop_all_notes(); - - playing_notes = true; - - notes_pointer = np; - notes_count = n_count; - notes_repeat = n_repeat; - notes_rest = n_rest; - - place = 0; - current_note = 0; - -#ifdef PWM_AUDIO - note_frequency = (*notes_pointer)[current_note][0] / SAMPLE_RATE; - note_length = (*notes_pointer)[current_note][1] * (((float)note_tempo) / 100); -#else - note_frequency = (*notes_pointer)[current_note][0]; - note_length = ((*notes_pointer)[current_note][1] / 4) * (((float)note_tempo) / 100); -#endif - note_position = 0; - -#ifdef PWM_AUDIO - ENABLE_AUDIO_COUNTER_3_ISR; -#else - ENABLE_AUDIO_COUNTER_3_ISR; - ENABLE_AUDIO_COUNTER_3_OUTPUT; -#endif - } -} - -#ifdef PWM_AUDIO -void play_sample(uint8_t* s, uint16_t l, bool r) { - if (!audio_initialized) { - audio_init(); - } - - if (audio_config.enable) { - DISABLE_AUDIO_COUNTER_3_ISR; - stop_all_notes(); - place_int = 0; - sample = s; - sample_length = l; - repeat = r; - - ENABLE_AUDIO_COUNTER_3_ISR; - } -} -#endif - -void audio_toggle(void) { - audio_config.enable ^= 1; - eeconfig_update_audio(audio_config.raw); -} - -void audio_on(void) { - audio_config.enable = 1; - eeconfig_update_audio(audio_config.raw); -} - -void audio_off(void) { - audio_config.enable = 0; - eeconfig_update_audio(audio_config.raw); -} - -#ifdef VIBRATO_ENABLE - -// Vibrato rate functions - -void set_vibrato_rate(float rate) { vibrato_rate = rate; } - -void increase_vibrato_rate(float change) { vibrato_rate *= change; } - -void decrease_vibrato_rate(float change) { vibrato_rate /= change; } - -# ifdef VIBRATO_STRENGTH_ENABLE - -void set_vibrato_strength(float strength) { vibrato_strength = strength; } - -void increase_vibrato_strength(float change) { vibrato_strength *= change; } - -void decrease_vibrato_strength(float change) { vibrato_strength /= change; } - -# endif /* VIBRATO_STRENGTH_ENABLE */ - -#endif /* VIBRATO_ENABLE */ - -// Polyphony functions - -void set_polyphony_rate(float rate) { polyphony_rate = rate; } - -void enable_polyphony() { polyphony_rate = 5; } - -void disable_polyphony() { polyphony_rate = 0; } - -void increase_polyphony_rate(float change) { polyphony_rate *= change; } - -void decrease_polyphony_rate(float change) { polyphony_rate /= change; } - -// Timbre function - -void set_timbre(float timbre) { note_timbre = timbre; } - -// Tempo functions - -void set_tempo(uint8_t tempo) { note_tempo = tempo; } - -void decrease_tempo(uint8_t tempo_change) { note_tempo += tempo_change; } - -void increase_tempo(uint8_t tempo_change) { - if (note_tempo - tempo_change < 10) { - note_tempo = 10; - } else { - note_tempo -= tempo_change; - } -} - -//------------------------------------------------------------------------------ -// Override these functions in your keymap file to play different tunes on -// startup and bootloader jump -__attribute__((weak)) void play_startup_tone() {} - -__attribute__((weak)) void play_goodbye_tone() {} -//------------------------------------------------------------------------------ |