mirror of
https://github.com/Keychron/qmk_firmware.git
synced 2024-12-30 21:38:01 +06:00
365 lines
9.6 KiB
C
365 lines
9.6 KiB
C
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <math.h>
|
|
#include <avr/pgmspace.h>
|
|
#include <avr/interrupt.h>
|
|
#include <avr/io.h>
|
|
|
|
#include "audio.h"
|
|
#include "keymap_common.h"
|
|
|
|
#define PI 3.14159265
|
|
|
|
// #define PWM_AUDIO
|
|
|
|
#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
|
|
#endif
|
|
|
|
void delay_us(int count) {
|
|
while(count--) {
|
|
_delay_us(1);
|
|
}
|
|
}
|
|
|
|
int voices = 0;
|
|
int voice_place = 0;
|
|
double frequency = 0;
|
|
int volume = 0;
|
|
long position = 0;
|
|
|
|
double frequencies[8] = {0, 0, 0, 0, 0, 0, 0, 0};
|
|
int volumes[8] = {0, 0, 0, 0, 0, 0, 0, 0};
|
|
bool sliding = false;
|
|
|
|
int max = 0xFF;
|
|
float sum = 0;
|
|
int value = 128;
|
|
float place = 0;
|
|
float places[8] = {0, 0, 0, 0, 0, 0, 0, 0};
|
|
|
|
uint16_t place_int = 0;
|
|
bool repeat = true;
|
|
uint8_t * sample;
|
|
uint16_t sample_length = 0;
|
|
|
|
|
|
bool notes = false;
|
|
bool note = false;
|
|
float note_frequency = 0;
|
|
float note_length = 0;
|
|
uint16_t note_position = 0;
|
|
float (* notes_pointer)[][2];
|
|
uint8_t notes_length;
|
|
bool notes_repeat;
|
|
uint8_t current_note = 0;
|
|
|
|
void stop_all_notes() {
|
|
voices = 0;
|
|
#ifdef PWM_AUDIO
|
|
TIMSK3 &= ~_BV(OCIE3A);
|
|
#else
|
|
TIMSK3 &= ~_BV(OCIE3A);
|
|
TCCR3A &= ~_BV(COM3A1);
|
|
#endif
|
|
notes = false;
|
|
note = false;
|
|
frequency = 0;
|
|
volume = 0;
|
|
|
|
for (int i = 0; i < 8; i++) {
|
|
frequencies[i] = 0;
|
|
volumes[i] = 0;
|
|
}
|
|
}
|
|
|
|
void stop_note(double freq) {
|
|
#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;
|
|
}
|
|
}
|
|
}
|
|
voices--;
|
|
if (voices < 0)
|
|
voices = 0;
|
|
if (voices == 0) {
|
|
#ifdef PWM_AUDIO
|
|
TIMSK3 &= ~_BV(OCIE3A);
|
|
#else
|
|
TIMSK3 &= ~_BV(OCIE3A);
|
|
TCCR3A &= ~_BV(COM3A1);
|
|
#endif
|
|
frequency = 0;
|
|
volume = 0;
|
|
note = false;
|
|
} else {
|
|
double freq = frequencies[voices - 1];
|
|
int vol = volumes[voices - 1];
|
|
double starting_f = frequency;
|
|
if (frequency < freq) {
|
|
sliding = true;
|
|
for (double f = starting_f; f <= freq; f += ((freq - starting_f) / 2000.0)) {
|
|
frequency = f;
|
|
}
|
|
sliding = false;
|
|
} else if (frequency > freq) {
|
|
sliding = true;
|
|
for (double f = starting_f; f >= freq; f -= ((starting_f - freq) / 2000.0)) {
|
|
frequency = f;
|
|
}
|
|
sliding = false;
|
|
}
|
|
frequency = freq;
|
|
volume = vol;
|
|
}
|
|
}
|
|
|
|
void init_notes() {
|
|
|
|
#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);
|
|
|
|
TIMSK3 &= ~_BV(OCIE3A); // 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
|
|
DDRC |= _BV(PORTC6);
|
|
|
|
TIMSK3 &= ~_BV(OCIE3A); // Turn off 3A interputs
|
|
|
|
TCCR3A = (0 << COM3A1) | (0 << COM3A0) | (1 << WGM31) | (0 << WGM30);
|
|
TCCR3B = (1 << WGM33) | (1 << WGM32) | (0 << CS32) | (1 << CS31) | (0 << CS30);
|
|
#endif
|
|
}
|
|
|
|
|
|
ISR(TIMER3_COMPA_vect) {
|
|
|
|
if (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 (frequency > 0) {
|
|
// ICR3 = (int)(((double)F_CPU) / frequency); // Set max to the period
|
|
// OCR3A = (int)(((double)F_CPU) / frequency) >> 1; // Set compare to half the period
|
|
if (place > 10) {
|
|
voice_place = (voice_place + 1) % voices;
|
|
place = 0.0;
|
|
}
|
|
ICR3 = (int)(((double)F_CPU) / frequencies[voice_place]); // Set max to the period
|
|
OCR3A = (int)(((double)F_CPU) / frequencies[voice_place]) >> 1; // Set compare to half the period
|
|
place++;
|
|
}
|
|
#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
|
|
// TIMSK3 &= ~_BV(OCIE3A);
|
|
|
|
|
|
if (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) {
|
|
ICR3 = (int)(((double)F_CPU) / note_frequency); // Set max to the period
|
|
OCR3A = (int)(((double)F_CPU) / note_frequency) >> 1; // Set compare to half the period
|
|
} else {
|
|
ICR3 = 0;
|
|
OCR3A = 0;
|
|
}
|
|
#endif
|
|
|
|
|
|
note_position++;
|
|
if (note_position >= note_length) {
|
|
current_note++;
|
|
if (current_note >= notes_length) {
|
|
if (notes_repeat) {
|
|
current_note = 0;
|
|
} else {
|
|
#ifdef PWM_AUDIO
|
|
TIMSK3 &= ~_BV(OCIE3A);
|
|
#else
|
|
TIMSK3 &= ~_BV(OCIE3A);
|
|
TCCR3A &= ~_BV(COM3A1);
|
|
#endif
|
|
notes = false;
|
|
return;
|
|
}
|
|
}
|
|
#ifdef PWM_AUDIO
|
|
note_frequency = (*notes_pointer)[current_note][0] / SAMPLE_RATE;
|
|
note_length = (*notes_pointer)[current_note][1];
|
|
#else
|
|
note_frequency = (*notes_pointer)[current_note][0];
|
|
note_length = (*notes_pointer)[current_note][1] / 4;
|
|
#endif
|
|
note_position = 0;
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
void play_notes(float (*np)[][2], uint8_t n_length, bool n_repeat) {
|
|
if (note)
|
|
stop_all_notes();
|
|
notes = true;
|
|
|
|
notes_pointer = np;
|
|
notes_length = n_length;
|
|
notes_repeat = n_repeat;
|
|
|
|
place = 0;
|
|
current_note = 0;
|
|
#ifdef PWM_AUDIO
|
|
note_frequency = (*notes_pointer)[current_note][0] / SAMPLE_RATE;
|
|
note_length = (*notes_pointer)[current_note][1];
|
|
#else
|
|
note_frequency = (*notes_pointer)[current_note][0];
|
|
note_length = (*notes_pointer)[current_note][1] / 4;
|
|
#endif
|
|
note_position = 0;
|
|
|
|
|
|
#ifdef PWM_AUDIO
|
|
TIMSK3 |= _BV(OCIE3A);
|
|
#else
|
|
TIMSK3 |= _BV(OCIE3A);
|
|
TCCR3A |= _BV(COM3A1);
|
|
#endif
|
|
}
|
|
|
|
void play_sample(uint8_t * s, uint16_t l, bool r) {
|
|
stop_all_notes();
|
|
place_int = 0;
|
|
sample = s;
|
|
sample_length = l;
|
|
repeat = r;
|
|
|
|
#ifdef PWM_AUDIO
|
|
TIMSK3 |= _BV(OCIE3A);
|
|
#else
|
|
#endif
|
|
}
|
|
|
|
void play_note(double freq, int vol) {
|
|
if (notes)
|
|
stop_all_notes();
|
|
note = true;
|
|
#ifdef PWM_AUDIO
|
|
freq = freq / SAMPLE_RATE;
|
|
#endif
|
|
if (freq > 0) {
|
|
if (frequency != 0) {
|
|
double starting_f = frequency;
|
|
if (frequency < freq) {
|
|
for (double f = starting_f; f <= freq; f += ((freq - starting_f) / 2000.0)) {
|
|
frequency = f;
|
|
}
|
|
} else if (frequency > freq) {
|
|
for (double f = starting_f; f >= freq; f -= ((starting_f - freq) / 2000.0)) {
|
|
frequency = f;
|
|
}
|
|
}
|
|
}
|
|
frequency = freq;
|
|
volume = vol;
|
|
|
|
frequencies[voices] = frequency;
|
|
volumes[voices] = volume;
|
|
voices++;
|
|
}
|
|
|
|
#ifdef PWM_AUDIO
|
|
TIMSK3 |= _BV(OCIE3A);
|
|
#else
|
|
TIMSK3 |= _BV(OCIE3A);
|
|
TCCR3A |= _BV(COM3A1);
|
|
#endif
|
|
|
|
} |