23839b8c6d
* Clarify the license for files we have signoff on * Update against the currently signed off files * Remove unused and not clearly licensed headers * Replace an #endif I accidentally removed while resolving merge conflicts
504 lines
13 KiB
C
504 lines
13 KiB
C
/* 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 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));
|
|
|
|
// Fast PWM Mode Controls
|
|
#define TIMER_3_PERIOD ICR3
|
|
#define TIMER_3_DUTY_CYCLE OCR3A
|
|
|
|
// -----------------------------------------------------------------------------
|
|
|
|
|
|
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;
|
|
|
|
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;
|
|
|
|
uint8_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;
|
|
bool glissando = true;
|
|
|
|
void audio_init()
|
|
{
|
|
|
|
// Check EEPROM
|
|
if (!eeconfig_is_enabled())
|
|
{
|
|
eeconfig_init();
|
|
}
|
|
audio_config.raw = eeconfig_read_audio();
|
|
|
|
// 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);
|
|
|
|
audio_initialized = true;
|
|
}
|
|
|
|
void stop_all_notes()
|
|
{
|
|
dprintf("audio stop all notes");
|
|
|
|
if (!audio_initialized) {
|
|
audio_init();
|
|
}
|
|
voices = 0;
|
|
|
|
DISABLE_AUDIO_COUNTER_3_ISR;
|
|
DISABLE_AUDIO_COUNTER_3_OUTPUT;
|
|
|
|
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)
|
|
{
|
|
dprintf("audio stop note freq=%d", (int)freq);
|
|
|
|
if (playing_note) {
|
|
if (!audio_initialized) {
|
|
audio_init();
|
|
}
|
|
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) {
|
|
DISABLE_AUDIO_COUNTER_3_ISR;
|
|
DISABLE_AUDIO_COUNTER_3_OUTPUT;
|
|
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)
|
|
{
|
|
float freq;
|
|
|
|
if (playing_note) {
|
|
if (voices > 0) {
|
|
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 {
|
|
freq = frequencies[voice_place];
|
|
}
|
|
#else
|
|
freq = frequencies[voice_place];
|
|
#endif
|
|
} else {
|
|
if (glissando) {
|
|
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];
|
|
}
|
|
} else {
|
|
frequency = frequencies[voices - 1];
|
|
}
|
|
|
|
#ifdef VIBRATO_ENABLE
|
|
if (vibrato_strength > 0) {
|
|
freq = vibrato(frequency);
|
|
} else {
|
|
freq = frequency;
|
|
}
|
|
#else
|
|
freq = frequency;
|
|
#endif
|
|
}
|
|
|
|
if (envelope_index < 65535) {
|
|
envelope_index++;
|
|
}
|
|
|
|
freq = voice_envelope(freq);
|
|
|
|
if (freq < 30.517578125) {
|
|
freq = 30.52;
|
|
}
|
|
|
|
TIMER_3_PERIOD = (uint16_t)(((float)F_CPU) / (freq * CPU_PRESCALER));
|
|
TIMER_3_DUTY_CYCLE = (uint16_t)((((float)F_CPU) / (freq * CPU_PRESCALER)) * note_timbre);
|
|
}
|
|
}
|
|
|
|
if (playing_notes) {
|
|
if (note_frequency > 0) {
|
|
#ifdef VIBRATO_ENABLE
|
|
if (vibrato_strength > 0) {
|
|
freq = vibrato(note_frequency);
|
|
} else {
|
|
freq = note_frequency;
|
|
}
|
|
#else
|
|
freq = note_frequency;
|
|
#endif
|
|
|
|
if (envelope_index < 65535) {
|
|
envelope_index++;
|
|
}
|
|
freq = voice_envelope(freq);
|
|
|
|
TIMER_3_PERIOD = (uint16_t)(((float)F_CPU) / (freq * CPU_PRESCALER));
|
|
TIMER_3_DUTY_CYCLE = (uint16_t)((((float)F_CPU) / (freq * CPU_PRESCALER)) * note_timbre);
|
|
} else {
|
|
TIMER_3_PERIOD = 0;
|
|
TIMER_3_DUTY_CYCLE = 0;
|
|
}
|
|
|
|
note_position++;
|
|
bool end_of_note = false;
|
|
if (TIMER_3_PERIOD > 0) {
|
|
end_of_note = (note_position >= (note_length / TIMER_3_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 {
|
|
DISABLE_AUDIO_COUNTER_3_ISR;
|
|
DISABLE_AUDIO_COUNTER_3_OUTPUT;
|
|
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;
|
|
envelope_index = 0;
|
|
note_frequency = (*notes_pointer)[current_note][0];
|
|
note_length = ((*notes_pointer)[current_note][1] / 4) * (((float)note_tempo) / 100);
|
|
}
|
|
|
|
note_position = 0;
|
|
}
|
|
}
|
|
|
|
if (!audio_config.enable) {
|
|
playing_notes = false;
|
|
playing_note = false;
|
|
}
|
|
}
|
|
|
|
void play_note(float freq, int vol) {
|
|
|
|
dprintf("audio play note freq=%d vol=%d", (int)freq, 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;
|
|
|
|
if (freq > 0) {
|
|
frequencies[voices] = freq;
|
|
volumes[voices] = vol;
|
|
voices++;
|
|
}
|
|
|
|
ENABLE_AUDIO_COUNTER_3_ISR;
|
|
ENABLE_AUDIO_COUNTER_3_OUTPUT;
|
|
}
|
|
|
|
}
|
|
|
|
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;
|
|
|
|
note_frequency = (*notes_pointer)[current_note][0];
|
|
note_length = ((*notes_pointer)[current_note][1] / 4) * (((float)note_tempo) / 100);
|
|
note_position = 0;
|
|
|
|
|
|
ENABLE_AUDIO_COUNTER_3_ISR;
|
|
ENABLE_AUDIO_COUNTER_3_OUTPUT;
|
|
}
|
|
|
|
}
|
|
|
|
bool is_playing_notes(void) {
|
|
return playing_notes;
|
|
}
|
|
|
|
bool is_audio_on(void) {
|
|
return (audio_config.enable != 0);
|
|
}
|
|
|
|
void audio_toggle(void) {
|
|
audio_config.enable ^= 1;
|
|
eeconfig_update_audio(audio_config.raw);
|
|
if (audio_config.enable)
|
|
audio_on_user();
|
|
}
|
|
|
|
void audio_on(void) {
|
|
audio_config.enable = 1;
|
|
eeconfig_update_audio(audio_config.raw);
|
|
audio_on_user();
|
|
}
|
|
|
|
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;
|
|
}
|
|
}
|