478 lines
10 KiB
C
478 lines
10 KiB
C
#include <stdio.h>
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#include <string.h>
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//#include <math.h>
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#include <avr/pgmspace.h>
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#include <avr/interrupt.h>
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#include <avr/io.h>
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#include "print.h"
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#include "audio.h"
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#include "keymap_common.h"
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#include "eeconfig.h"
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#define CPU_PRESCALER 8
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// -----------------------------------------------------------------------------
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// Timer Abstractions
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// -----------------------------------------------------------------------------
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// TIMSK3 - Timer/Counter #3 Interrupt Mask Register
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// Turn on/off 3A interputs, stopping/enabling the ISR calls
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#define ENABLE_AUDIO_COUNTER_3_ISR TIMSK3 |= _BV(OCIE3A)
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#define DISABLE_AUDIO_COUNTER_3_ISR TIMSK3 &= ~_BV(OCIE3A)
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// TCCR3A: Timer/Counter #3 Control Register
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// Compare Output Mode (COM3An) = 0b00 = Normal port operation, OC3A disconnected from PC6
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#define ENABLE_AUDIO_COUNTER_3_OUTPUT TCCR3A |= _BV(COM3A1);
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#define DISABLE_AUDIO_COUNTER_3_OUTPUT TCCR3A &= ~(_BV(COM3A1) | _BV(COM3A0));
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// Fast PWM Mode Controls
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#define TIMER_3_PERIOD ICR3
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#define TIMER_3_DUTY_CYCLE OCR3A
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// -----------------------------------------------------------------------------
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int voices = 0;
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int voice_place = 0;
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float frequency = 0;
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int volume = 0;
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long position = 0;
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float frequencies[8] = {0, 0, 0, 0, 0, 0, 0, 0};
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int volumes[8] = {0, 0, 0, 0, 0, 0, 0, 0};
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bool sliding = false;
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float place = 0;
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uint8_t * sample;
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uint16_t sample_length = 0;
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bool playing_notes = false;
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bool playing_note = false;
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float note_frequency = 0;
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float note_length = 0;
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uint8_t note_tempo = TEMPO_DEFAULT;
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float note_timbre = TIMBRE_DEFAULT;
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uint16_t note_position = 0;
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float (* notes_pointer)[][2];
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uint16_t notes_count;
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bool notes_repeat;
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float notes_rest;
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bool note_resting = false;
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uint8_t current_note = 0;
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uint8_t rest_counter = 0;
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#ifdef VIBRATO_ENABLE
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float vibrato_counter = 0;
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float vibrato_strength = .5;
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float vibrato_rate = 0.125;
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#endif
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float polyphony_rate = 0;
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static bool audio_initialized = false;
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audio_config_t audio_config;
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uint16_t envelope_index = 0;
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void audio_init()
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{
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// Check EEPROM
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if (!eeconfig_is_enabled())
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{
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eeconfig_init();
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}
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audio_config.raw = eeconfig_read_audio();
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// Set port PC6 (OC3A and /OC4A) as output
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DDRC |= _BV(PORTC6);
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DISABLE_AUDIO_COUNTER_3_ISR;
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// TCCR3A / TCCR3B: Timer/Counter #3 Control Registers
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// Compare Output Mode (COM3An) = 0b00 = Normal port operation, OC3A disconnected from PC6
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// Waveform Generation Mode (WGM3n) = 0b1110 = Fast PWM Mode 14 (Period = ICR3, Duty Cycle = OCR3A)
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// Clock Select (CS3n) = 0b010 = Clock / 8
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TCCR3A = (0 << COM3A1) | (0 << COM3A0) | (1 << WGM31) | (0 << WGM30);
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TCCR3B = (1 << WGM33) | (1 << WGM32) | (0 << CS32) | (1 << CS31) | (0 << CS30);
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audio_initialized = true;
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}
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void stop_all_notes()
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{
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if (!audio_initialized) {
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audio_init();
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}
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voices = 0;
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DISABLE_AUDIO_COUNTER_3_ISR;
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DISABLE_AUDIO_COUNTER_3_OUTPUT;
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playing_notes = false;
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playing_note = false;
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frequency = 0;
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volume = 0;
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for (uint8_t i = 0; i < 8; i++)
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{
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frequencies[i] = 0;
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volumes[i] = 0;
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}
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}
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void stop_note(float freq)
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{
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if (playing_note) {
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if (!audio_initialized) {
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audio_init();
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}
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for (int i = 7; i >= 0; i--) {
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if (frequencies[i] == freq) {
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frequencies[i] = 0;
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volumes[i] = 0;
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for (int j = i; (j < 7); j++) {
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frequencies[j] = frequencies[j+1];
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frequencies[j+1] = 0;
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volumes[j] = volumes[j+1];
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volumes[j+1] = 0;
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}
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break;
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}
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}
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voices--;
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if (voices < 0)
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voices = 0;
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if (voice_place >= voices) {
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voice_place = 0;
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}
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if (voices == 0) {
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DISABLE_AUDIO_COUNTER_3_ISR;
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DISABLE_AUDIO_COUNTER_3_OUTPUT;
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frequency = 0;
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volume = 0;
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playing_note = false;
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}
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}
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}
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#ifdef VIBRATO_ENABLE
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float mod(float a, int b)
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{
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float r = fmod(a, b);
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return r < 0 ? r + b : r;
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}
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float vibrato(float average_freq) {
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#ifdef VIBRATO_STRENGTH_ENABLE
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float vibrated_freq = average_freq * pow(vibrato_lut[(int)vibrato_counter], vibrato_strength);
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#else
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float vibrated_freq = average_freq * vibrato_lut[(int)vibrato_counter];
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#endif
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vibrato_counter = mod((vibrato_counter + vibrato_rate * (1.0 + 440.0/average_freq)), VIBRATO_LUT_LENGTH);
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return vibrated_freq;
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}
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#endif
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ISR(TIMER3_COMPA_vect)
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{
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float freq;
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if (playing_note) {
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if (voices > 0) {
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if (polyphony_rate > 0) {
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if (voices > 1) {
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voice_place %= voices;
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if (place++ > (frequencies[voice_place] / polyphony_rate / CPU_PRESCALER)) {
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voice_place = (voice_place + 1) % voices;
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place = 0.0;
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}
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}
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#ifdef VIBRATO_ENABLE
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if (vibrato_strength > 0) {
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freq = vibrato(frequencies[voice_place]);
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} else {
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freq = frequencies[voice_place];
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}
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#else
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freq = frequencies[voice_place];
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#endif
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} else {
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if (frequency != 0 && frequency < frequencies[voices - 1] && frequency < frequencies[voices - 1] * pow(2, -440/frequencies[voices - 1]/12/2)) {
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frequency = frequency * pow(2, 440/frequency/12/2);
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} else if (frequency != 0 && frequency > frequencies[voices - 1] && frequency > frequencies[voices - 1] * pow(2, 440/frequencies[voices - 1]/12/2)) {
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frequency = frequency * pow(2, -440/frequency/12/2);
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} else {
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frequency = frequencies[voices - 1];
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}
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#ifdef VIBRATO_ENABLE
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if (vibrato_strength > 0) {
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freq = vibrato(frequency);
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} else {
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freq = frequency;
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}
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#else
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freq = frequency;
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#endif
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}
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if (envelope_index < 65535) {
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envelope_index++;
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}
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freq = voice_envelope(freq);
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if (freq < 30.517578125) {
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freq = 30.52;
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}
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TIMER_3_PERIOD = (uint16_t)(((float)F_CPU) / (freq * CPU_PRESCALER));
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TIMER_3_DUTY_CYCLE = (uint16_t)((((float)F_CPU) / (freq * CPU_PRESCALER)) * note_timbre);
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}
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}
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if (playing_notes) {
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if (note_frequency > 0) {
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#ifdef VIBRATO_ENABLE
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if (vibrato_strength > 0) {
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freq = vibrato(note_frequency);
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} else {
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freq = note_frequency;
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}
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#else
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freq = note_frequency;
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#endif
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if (envelope_index < 65535) {
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envelope_index++;
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}
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freq = voice_envelope(freq);
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TIMER_3_PERIOD = (uint16_t)(((float)F_CPU) / (freq * CPU_PRESCALER));
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TIMER_3_DUTY_CYCLE = (uint16_t)((((float)F_CPU) / (freq * CPU_PRESCALER)) * note_timbre);
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} else {
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TIMER_3_PERIOD = 0;
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TIMER_3_DUTY_CYCLE = 0;
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}
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note_position++;
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bool end_of_note = false;
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if (TIMER_3_PERIOD > 0) {
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end_of_note = (note_position >= (note_length / TIMER_3_PERIOD * 0xFFFF));
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} else {
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end_of_note = (note_position >= (note_length * 0x7FF));
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}
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if (end_of_note) {
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current_note++;
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if (current_note >= notes_count) {
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if (notes_repeat) {
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current_note = 0;
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} else {
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DISABLE_AUDIO_COUNTER_3_ISR;
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DISABLE_AUDIO_COUNTER_3_OUTPUT;
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playing_notes = false;
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return;
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}
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}
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if (!note_resting && (notes_rest > 0)) {
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note_resting = true;
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note_frequency = 0;
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note_length = notes_rest;
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current_note--;
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} else {
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note_resting = false;
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envelope_index = 0;
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note_frequency = (*notes_pointer)[current_note][0];
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note_length = ((*notes_pointer)[current_note][1] / 4) * (((float)note_tempo) / 100);
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}
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note_position = 0;
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}
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}
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if (!audio_config.enable) {
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playing_notes = false;
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playing_note = false;
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}
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}
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void play_note(float freq, int vol) {
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if (!audio_initialized) {
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audio_init();
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}
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if (audio_config.enable && voices < 8) {
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DISABLE_AUDIO_COUNTER_3_ISR;
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// Cancel notes if notes are playing
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if (playing_notes)
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stop_all_notes();
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playing_note = true;
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envelope_index = 0;
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if (freq > 0) {
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frequencies[voices] = freq;
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volumes[voices] = vol;
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voices++;
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}
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ENABLE_AUDIO_COUNTER_3_ISR;
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ENABLE_AUDIO_COUNTER_3_OUTPUT;
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}
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}
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void play_notes(float (*np)[][2], uint16_t n_count, bool n_repeat, float n_rest)
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{
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if (!audio_initialized) {
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audio_init();
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}
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if (audio_config.enable) {
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DISABLE_AUDIO_COUNTER_3_ISR;
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// Cancel note if a note is playing
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if (playing_note)
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stop_all_notes();
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playing_notes = true;
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notes_pointer = np;
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notes_count = n_count;
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notes_repeat = n_repeat;
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notes_rest = n_rest;
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place = 0;
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current_note = 0;
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note_frequency = (*notes_pointer)[current_note][0];
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note_length = ((*notes_pointer)[current_note][1] / 4) * (((float)note_tempo) / 100);
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note_position = 0;
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ENABLE_AUDIO_COUNTER_3_ISR;
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ENABLE_AUDIO_COUNTER_3_OUTPUT;
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}
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}
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bool is_playing_notes(void) {
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return playing_notes;
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}
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bool is_audio_on(void) {
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return (audio_config.enable != 0);
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}
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void audio_toggle(void) {
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audio_config.enable ^= 1;
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eeconfig_update_audio(audio_config.raw);
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if (audio_config.enable)
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audio_on_user();
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}
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void audio_on(void) {
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audio_config.enable = 1;
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eeconfig_update_audio(audio_config.raw);
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audio_on_user();
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}
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void audio_off(void) {
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audio_config.enable = 0;
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eeconfig_update_audio(audio_config.raw);
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}
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#ifdef VIBRATO_ENABLE
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// Vibrato rate functions
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void set_vibrato_rate(float rate) {
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vibrato_rate = rate;
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}
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void increase_vibrato_rate(float change) {
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vibrato_rate *= change;
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}
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void decrease_vibrato_rate(float change) {
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vibrato_rate /= change;
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}
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#ifdef VIBRATO_STRENGTH_ENABLE
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void set_vibrato_strength(float strength) {
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vibrato_strength = strength;
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}
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void increase_vibrato_strength(float change) {
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vibrato_strength *= change;
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}
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void decrease_vibrato_strength(float change) {
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vibrato_strength /= change;
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}
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#endif /* VIBRATO_STRENGTH_ENABLE */
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#endif /* VIBRATO_ENABLE */
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// Polyphony functions
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void set_polyphony_rate(float rate) {
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polyphony_rate = rate;
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}
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void enable_polyphony() {
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polyphony_rate = 5;
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}
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void disable_polyphony() {
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polyphony_rate = 0;
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}
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void increase_polyphony_rate(float change) {
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polyphony_rate *= change;
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}
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void decrease_polyphony_rate(float change) {
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polyphony_rate /= change;
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}
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// Timbre function
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void set_timbre(float timbre) {
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note_timbre = timbre;
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}
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// Tempo functions
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void set_tempo(uint8_t tempo) {
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note_tempo = tempo;
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}
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void decrease_tempo(uint8_t tempo_change) {
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note_tempo += tempo_change;
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}
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void increase_tempo(uint8_t tempo_change) {
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if (note_tempo - tempo_change < 10) {
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note_tempo = 10;
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} else {
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note_tempo -= tempo_change;
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}
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}
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