172 lines
3.9 KiB
C
172 lines
3.9 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 "beeps.h"
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#include "keymap_common.h"
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#include "wave.h"
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#define PI 3.14159265
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#define SAMPLE_DIVIDER 70
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#define SAMPLE_RATE (2000000.0/SAMPLE_DIVIDER/256)
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// Resistor value of 1/ (2 * PI * 10nF * (2000000 hertz / SAMPLE_DIVIDER / 10)) for 10nF cap
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void delay_us(int count) {
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while(count--) {
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_delay_us(1);
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}
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}
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int voices = 0;
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double frequency = 0;
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int volume = 0;
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long position = 0;
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double 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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#define RANGE 1000
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volatile int i=0; //elements of the wave
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void stop_all_notes() {
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voices = 0;
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TIMSK3 &= ~_BV(OCIE3A);
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frequency = 0;
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volume = 0;
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for (int i = 0; i < 8; i++) {
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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(double freq) {
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freq = freq / SAMPLE_RATE;
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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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}
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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 (voices == 0) {
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TIMSK3 &= ~_BV(OCIE3A);
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frequency = 0;
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volume = 0;
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} else {
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double freq = frequencies[voices - 1];
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int vol = volumes[voices - 1];
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double starting_f = frequency;
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if (frequency < freq) {
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sliding = true;
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for (double f = starting_f; f <= freq; f += ((freq - starting_f) / 500.0)) {
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frequency = f;
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}
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sliding = false;
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} else if (frequency > freq) {
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sliding = true;
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for (double f = starting_f; f >= freq; f -= ((starting_f - freq) / 500.0)) {
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frequency = f;
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}
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sliding = false;
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}
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frequency = freq;
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volume = vol;
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}
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}
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void init_notes() {
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PLLFRQ = _BV(PDIV2);
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PLLCSR = _BV(PLLE);
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while(!(PLLCSR & _BV(PLOCK)));
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PLLFRQ |= _BV(PLLTM0); /* PCK 48MHz */
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/* Init a fast PWM on Timer4 */
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TCCR4A = _BV(COM4A0) | _BV(PWM4A); /* Clear OC4A on Compare Match */
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TCCR4B = _BV(CS40); /* No prescaling => f = PCK/256 = 187500Hz */
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OCR4A = 0;
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/* Enable the OC4A output */
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DDRC |= _BV(PORTC6);
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}
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int max = 0xFF;
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float sum = 0;
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int value = 128;
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float place = 0;
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ISR(TIMER3_COMPA_vect) {
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// SINE
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OCR4A = pgm_read_byte(&sinewave[(uint16_t)place]);
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// SQUARE
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// if (((int)place) >= 1024){
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// OCR4A = 0xFF;
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// } else {
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// OCR4A = 0x00;
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// }
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// SAWTOOTH
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// OCR4A = (int)place / 4;
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// TRIANGLE
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// if (((int)place) >= 1024) {
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// OCR4A = (int)place / 2;
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// } else {
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// OCR4A = 2048 - (int)place / 2;
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// }
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place += frequency;
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if (place >= SINE_LENGTH)
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place -= SINE_LENGTH;
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}
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void play_note(double freq, int vol) {
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freq = freq / SAMPLE_RATE;
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if (freq > 0) {
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if (frequency != 0) {
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double starting_f = frequency;
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if (frequency < freq) {
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for (double f = starting_f; f <= freq; f += ((freq - starting_f) / 500.0)) {
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frequency = f;
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}
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} else if (frequency > freq) {
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for (double f = starting_f; f >= freq; f -= ((starting_f - freq) / 500.0)) {
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frequency = f;
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}
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}
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}
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frequency = freq;
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volume = vol;
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frequencies[voices] = frequency;
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volumes[voices] = volume;
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voices++;
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}
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TIMSK3 &= ~_BV(OCIE3A);
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TCCR3A = 0x0;
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TCCR3B = _BV(CS31) | _BV(WGM32);
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OCR3A = SAMPLE_DIVIDER - 1;
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TIMSK3 |= _BV(OCIE3A);
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} |