246 lines
6.7 KiB
C
246 lines
6.7 KiB
C
#include "beeps.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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#define PI 3.14159265
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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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int 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 beeps() {
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play_notes();
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}
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void send_freq(double freq, int vol) {
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int duty = (((double)F_CPU) / freq);
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ICR3 = duty; // Set max to the period
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OCR3A = duty >> (0x10 - vol); // Set compare to half the period
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}
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void stop_all_notes() {
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voices = 0;
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TCCR3A = 0;
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TCCR3B = 0;
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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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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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TCCR3A = 0;
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TCCR3B = 0;
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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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if (frequency < freq) {
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sliding = true;
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for (double f = frequency; f <= freq; f += ((freq - frequency) / 500.0)) {
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send_freq(f, vol);
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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 = frequency; f >= freq; f -= ((frequency - freq) / 500.0)) {
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send_freq(f, vol);
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}
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sliding = false;
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}
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send_freq(freq, vol);
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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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// TCCR1A = (1 << COM1A1) | (0 << COM1A0) | (1 << WGM11) | (1 << WGM10);
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// TCCR1B = (1 << COM1B1) | (0 << COM1A0) | (1 << WGM13) | (1 << WGM12) | (0 << CS12) | (0 << CS11) | (1 << CS10);
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// DDRC |= (1<<6);
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// TCCR3A = (1 << COM3A1) | (0 << COM3A0) | (1 << WGM31) | (0 << WGM30);
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// TCCR3B = (1 << WGM33) | (1 << WGM32) | (0 << CS32) | (0 << CS31) | (1 << CS30);
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// ICR3 = 0xFFFF;
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// OCR3A = (int)((float)wave[i]*ICR3/RANGE); //go to next array element
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// cli();
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// /* Enable interrupt on timer2 == 127, with clk/8 prescaler. At 16MHz,
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// this gives a timer interrupt at 15625Hz. */
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// TIMSK3 = (1 << OCIE3A);
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// /* clear/reset timer on match */
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// // TCCR3A = 1<<WGM31 | 0<<WGM30; CTC mode, reset on match
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// // TCCR3B = 0<<CS32 | 1<<CS31 | 0<<CS30; /* clk, /8 prescaler */
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// TCCR3A = (1 << COM3A1) | (0 << COM3A0) | (1 << WGM31) | (0 << WGM30);
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// TCCR3B = (0 << WGM33) | (0 << WGM32) | (0 << CS32) | (0 << CS31) | (1 << CS30);
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// TCCR1A = (1 << COM1A1) | (0 << COM1A0) | (1 << WGM11) | (0 << WGM10);
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// TCCR1B = (1 << WGM12) | (0 << CS12) | (0 << CS11) | (1 << CS10);
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// // SPCR = 0x50;
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// // SPSR = 0x01;
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// DDRC |= (1<<6);
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// // ICR3 = 0xFFFF;
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// // OCR3A=80;
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// PORTC |= (1<<6);
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// sei();
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}
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// #define highByte(c) ((c >> 8) & 0x00FF)
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// #define lowByte(c) (c & 0x00FF)
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ISR(TIMER3_COMPA_vect) {
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if (ICR3 > 0 && !sliding) {
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switch (position) {
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case 0: {
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int duty = (((double)F_CPU) / (frequency));
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ICR3 = duty; // Set max to the period
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OCR3A = duty >> 1; // Set compare to half the period
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break;
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}
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case 1: {
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int duty = (((double)F_CPU) / (frequency*2));
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ICR3 = duty; // Set max to the period
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OCR3A = duty >> 1; // Set compare to half the period
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break;
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}
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case 2: {
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int duty = (((double)F_CPU) / (frequency*3));
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ICR3 = duty; // Set max to the period
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OCR3A = duty >> 1; // Set compare to half the period
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break;
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}
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}
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position = (position + 1) % 3;
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}
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// /* OCR2A has been cleared, per TCCR2A above */
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// // OCR3A = 127;
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// // pos1 += incr1;
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// // pos2 += incr2;
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// // pos3 += incr3;
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// // sample = sinewave[highByte(pos1)] + sinewave[highByte(pos2)] + sinewave[highByte(pos3)];
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// // OCR3A = sample;
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// OCR3A=pgm_read_byte(&sinewave[pos1]);
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// pos1++;
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// // PORTC &= ~(1<<6);
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// /* buffered, 1x gain, active mode */
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// // SPDR = highByte(sample) | 0x70;
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// // while (!(SPSR & (1<<SPIF)));
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// // SPDR = lowByte(sample);
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// // while (!(SPSR & (1<<SPIF)));
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// // PORTC |= (1<<6);
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}
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void play_note(double freq, int vol) {
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if (freq > 0) {
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DDRC |= (1<<6);
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TCCR3A = (1 << 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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if (frequency != 0) {
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if (frequency < freq) {
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for (double f = frequency; f <= freq; f += ((freq - frequency) / 500.0)) {
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send_freq(f, vol);
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}
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} else if (frequency > freq) {
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for (double f = frequency; f >= freq; f -= ((frequency - freq) / 500.0)) {
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send_freq(f, vol);
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}
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}
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}
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send_freq(freq, vol);
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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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// ICR3 = 0xFFFF;
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// for (int i = 0; i < 10000; i++) {
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// OCR3A = round((sin(i*freq)*.5)+.5)*0xFFFF;
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// // _delay_us(50);
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// }
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// TCCR3A = 0;
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// TCCR3B = 0;
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}
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// void note(int x, float length) {
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// DDRC |= (1<<6);
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// int t = (int)(440*pow(2,-x/12.0)); // starting note
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// for (int y = 0; y < length*1000/t; y++) { // note length
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// PORTC |= (1<<6);
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// delay_us(t);
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// PORTC &= ~(1<<6);
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// delay_us(t);
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// }
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// PORTC &= ~(1<<6);
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// }
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// void true_note(float x, float y, float length) {
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// for (uint32_t i = 0; i < length * 50; i++) {
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// uint32_t v = (uint32_t) (round(sin(PI*2*i*640000*pow(2, x/12.0))*.5+1 + sin(PI*2*i*640000*pow(2, y/12.0))*.5+1) / 2 * pow(2, 8));
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// for (int u = 0; u < 8; u++) {
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// if (v & (1 << u) && !(PORTC&(1<<6)))
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// PORTC |= (1<<6);
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// else if (PORTC&(1<<6))
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// PORTC &= ~(1<<6);
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// }
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// }
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// PORTC &= ~(1<<6);
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// }
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