220 lines
6.1 KiB
C
220 lines
6.1 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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#define CHANNEL OCR1C
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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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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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void beeps() {
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// DDRB |= (1<<7);
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// PORTB &= ~(1<<7);
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// // Use full 16-bit resolution.
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// ICR1 = 0xFFFF;
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// // I could write a wall of text here to explain... but TL;DW
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// // Go read the ATmega32u4 datasheet.
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// // And this: http://blog.saikoled.com/post/43165849837/secret-konami-cheat-code-to-high-resolution-pwm-on
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// // Pin PB7 = OCR1C (Timer 1, Channel C)
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// // Compare Output Mode = Clear on compare match, Channel C = COM1C1=1 COM1C0=0
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// // (i.e. start high, go low when counter matches.)
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// // WGM Mode 14 (Fast PWM) = WGM13=1 WGM12=1 WGM11=1 WGM10=0
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// // Clock Select = clk/1 (no prescaling) = CS12=0 CS11=0 CS10=1
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// TCCR1A = _BV(COM1C1) | _BV(WGM11); // = 0b00001010;
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// TCCR1B = _BV(WGM13) | _BV(WGM12) | _BV(CS10); // = 0b00011001;
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// // Turn off PWM control on PB7, revert to output low.
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// // TCCR1A &= ~(_BV(COM1C1));
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// // CHANNEL = ((1 << level) - 1);
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// // Turn on PWM control of PB7
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// TCCR1A |= _BV(COM1C1);
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// // CHANNEL = level << OFFSET | 0x0FFF;
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// // CHANNEL = 0b1010101010101010;
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// float x = 12;
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// float y = 24;
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// float length = 50;
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// float scale = 1;
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// // int f1 = 1000000/440;
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// // int f2 = 1000000/880;
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// // for (uint32_t i = 0; i < length * 1000; i++) {
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// // // int frequency = 1/((sin(PI*2*i*scale*pow(2, x/12.0))*.5+1 + sin(PI*2*i*scale*pow(2, y/12.0))*.5+1) / 2);
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// // ICR1 = f1; // Set max to the period
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// // OCR1C = f1 >> 1; // Set compare to half the period
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// // // _delay_us(10);
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// // }
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// int frequency = 1000000/440;
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// ICR1 = frequency; // Set max to the period
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// OCR1C = frequency >> 1; // Set compare to half the period
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// _delay_us(500000);
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// TCCR1A &= ~(_BV(COM1C1));
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// CHANNEL = 0;
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play_notes();
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// play_note(55*pow(2, 0/12.0), 1);
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// play_note(55*pow(2, 12/12.0), 1);
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// play_note(55*pow(2, 24/12.0), 1);
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// play_note(55*pow(2, 0/12.0), 1);
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// play_note(55*pow(2, 12/12.0), 1);
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// play_note(55*pow(2, 24/12.0), 1);
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// play_note(0, 4);
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// play_note(55*pow(2, 0/12.0), 8);
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// play_note(55*pow(2, 12/12.0), 4);
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// play_note(55*pow(2, 10/12.0), 4);
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// play_note(55*pow(2, 12/12.0), 8);
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// play_note(55*pow(2, 10/12.0), 4);
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// play_note(55*pow(2, 7/12.0), 2);
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// play_note(55*pow(2, 8/12.0), 2);
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// play_note(55*pow(2, 7/12.0), 16);
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// play_note(0, 4);
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// play_note(55*pow(2, 3/12.0), 8);
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// play_note(55*pow(2, 5/12.0), 4);
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// play_note(55*pow(2, 7/12.0), 4);
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// play_note(55*pow(2, 7/12.0), 8);
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// play_note(55*pow(2, 5/12.0), 4);
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// play_note(55*pow(2, 3/12.0), 4);
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// play_note(55*pow(2, 2/12.0), 16);
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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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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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TCCR3A = 0;
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TCCR3B = 0;
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frequency = 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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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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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 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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} |