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#include "beeps.h"
#include <math.h>
#include <avr/pgmspace.h>
#include <avr/interrupt.h>
#include <avr/io.h>
#define PI 3.14159265
#define CHANNEL OCR1C
void delay_us(int count) {
while(count--) {
_delay_us(1);
}
}
int voices = 0;
double frequency = 0;
int volume = 0;
double frequencies[8] = {0, 0, 0, 0, 0, 0, 0, 0};
int volumes[8] = {0, 0, 0, 0, 0, 0, 0, 0};
void beeps() {
// DDRB |= (1<<7);
// PORTB &= ~(1<<7);
// // Use full 16-bit resolution.
// ICR1 = 0xFFFF;
// // I could write a wall of text here to explain... but TL;DW
// // Go read the ATmega32u4 datasheet.
// // And this: http://blog.saikoled.com/post/43165849837/secret-konami-cheat-code-to-high-resolution-pwm-on
// // Pin PB7 = OCR1C (Timer 1, Channel C)
// // Compare Output Mode = Clear on compare match, Channel C = COM1C1=1 COM1C0=0
// // (i.e. start high, go low when counter matches.)
// // WGM Mode 14 (Fast PWM) = WGM13=1 WGM12=1 WGM11=1 WGM10=0
// // Clock Select = clk/1 (no prescaling) = CS12=0 CS11=0 CS10=1
// TCCR1A = _BV(COM1C1) | _BV(WGM11); // = 0b00001010;
// TCCR1B = _BV(WGM13) | _BV(WGM12) | _BV(CS10); // = 0b00011001;
// // Turn off PWM control on PB7, revert to output low.
// // TCCR1A &= ~(_BV(COM1C1));
// // CHANNEL = ((1 << level) - 1);
// // Turn on PWM control of PB7
// TCCR1A |= _BV(COM1C1);
// // CHANNEL = level << OFFSET | 0x0FFF;
// // CHANNEL = 0b1010101010101010;
// float x = 12;
// float y = 24;
// float length = 50;
// float scale = 1;
// // int f1 = 1000000/440;
// // int f2 = 1000000/880;
// // for (uint32_t i = 0; i < length * 1000; i++) {
// // // 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);
// // ICR1 = f1; // Set max to the period
// // OCR1C = f1 >> 1; // Set compare to half the period
// // // _delay_us(10);
// // }
// int frequency = 1000000/440;
// ICR1 = frequency; // Set max to the period
// OCR1C = frequency >> 1; // Set compare to half the period
// _delay_us(500000);
// TCCR1A &= ~(_BV(COM1C1));
// CHANNEL = 0;
play_notes();
// play_note(55*pow(2, 0/12.0), 1);
// play_note(55*pow(2, 12/12.0), 1);
// play_note(55*pow(2, 24/12.0), 1);
// play_note(55*pow(2, 0/12.0), 1);
// play_note(55*pow(2, 12/12.0), 1);
// play_note(55*pow(2, 24/12.0), 1);
// play_note(0, 4);
// play_note(55*pow(2, 0/12.0), 8);
// play_note(55*pow(2, 12/12.0), 4);
// play_note(55*pow(2, 10/12.0), 4);
// play_note(55*pow(2, 12/12.0), 8);
// play_note(55*pow(2, 10/12.0), 4);
// play_note(55*pow(2, 7/12.0), 2);
// play_note(55*pow(2, 8/12.0), 2);
// play_note(55*pow(2, 7/12.0), 16);
// play_note(0, 4);
// play_note(55*pow(2, 3/12.0), 8);
// play_note(55*pow(2, 5/12.0), 4);
// play_note(55*pow(2, 7/12.0), 4);
// play_note(55*pow(2, 7/12.0), 8);
// play_note(55*pow(2, 5/12.0), 4);
// play_note(55*pow(2, 3/12.0), 4);
// play_note(55*pow(2, 2/12.0), 16);
}
void send_freq(double freq, int vol) {
int duty = (((double)F_CPU) / freq);
ICR3 = duty; // Set max to the period
OCR3A = duty >> (0x10 - vol); // Set compare to half the period
}
void stop_all_notes() {
voices = 0;
TCCR3A = 0;
TCCR3B = 0;
frequency = 0;
for (int i = 0; i < 8; i++) {
frequencies[i] = 0;
volumes[i] = 0;
}
}
void stop_note(double freq) {
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) {
TCCR3A = 0;
TCCR3B = 0;
frequency = 0;
} else {
double freq = frequencies[voices - 1];
int vol = volumes[voices - 1];
if (frequency < freq) {
for (double f = frequency; f <= freq; f += ((freq - frequency) / 500.0)) {
send_freq(f, vol);
}
} else if (frequency > freq) {
for (double f = frequency; f >= freq; f -= ((frequency - freq) / 500.0)) {
send_freq(f, vol);
}
}
send_freq(freq, vol);
frequency = freq;
volume = vol;
}
}
void play_note(double freq, int vol) {
if (freq > 0) {
DDRC |= (1<<6);
TCCR3A = (1 << COM3A1) | (0 << COM3A0) | (1 << WGM31) | (0 << WGM30);
TCCR3B = (1 << WGM33) | (1 << WGM32) | (0 << CS32) | (1 << CS31) | (0 << CS30);
if (frequency != 0) {
if (frequency < freq) {
for (double f = frequency; f <= freq; f += ((freq - frequency) / 500.0)) {
send_freq(f, vol);
}
} else if (frequency > freq) {
for (double f = frequency; f >= freq; f -= ((frequency - freq) / 500.0)) {
send_freq(f, vol);
}
}
}
send_freq(freq, vol);
frequency = freq;
volume = vol;
frequencies[voices] = frequency;
volumes[voices] = volume;
voices++;
}
// ICR3 = 0xFFFF;
// for (int i = 0; i < 10000; i++) {
// OCR3A = round((sin(i*freq)*.5)+.5)*0xFFFF;
// // _delay_us(50);
// }
// TCCR3A = 0;
// TCCR3B = 0;
}
void note(int x, float length) {
DDRC |= (1<<6);
int t = (int)(440*pow(2,-x/12.0)); // starting note
for (int y = 0; y < length*1000/t; y++) { // note length
PORTC |= (1<<6);
delay_us(t);
PORTC &= ~(1<<6);
delay_us(t);
}
PORTC &= ~(1<<6);
}
void true_note(float x, float y, float length) {
for (uint32_t i = 0; i < length * 50; i++) {
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));
for (int u = 0; u < 8; u++) {
if (v & (1 << u) && !(PORTC&(1<<6)))
PORTC |= (1<<6);
else if (PORTC&(1<<6))
PORTC &= ~(1<<6);
}
}
PORTC &= ~(1<<6);
}
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