#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
volatile uint16_t sample;
uint16_t lastSample;
const int sounddata_length=200;
const unsigned char sounddata_data[] PROGMEM = {128,
128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128,
128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128,
128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128,
128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128,
128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128,
128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128,
128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128,
128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128,
128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128,
128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 129, 127, 129, 128, 127, 133,
117, 109, 125, 121, 116, 132, 140, 126, 114, 114, 116, 120, 114, 93, 73, 66, 76, 116, 142, 129,
128, 129, 120, 119, 118, 104, 87, 123, 181, 194, 196, 198, 189, 176, 160, 162, 172, 164, 164, 183,
197, 188, 168, 167, 170, 165, 185, 209, 206, 196, 196, 199, 185, 162, 156, 167, 176, 173, 170, 166,
151, 142, 140, 134, 130, 127, 113, 86, 67, 66, 69, 75, 73, 75, 86, 90, 91, 84, 65, 48,
41, 30, 26, 56, 91, 88, 72, 70, 73, 82, 89, 73, 57, 60, 74, 89, 92, 77, 63, 60,
53, 47, 56, 64, 63, 61, 56, 54, 52, 36, 16, 22, 51, 66, 67, 70, 76, 88, 99, 92,
77, 74, 85, 100, 106, 97, 83, 85, 96, 108, 133, 160, 164};
void delay_us(int count) {
while(count--) {
_delay_us(1);
}
}
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 play_note(float freq, int length) {
DDRB |= (1<<7);
PORTB &= ~(1<<7);
if (freq > 0) {
int frequency = 1000000/freq;
ICR1 = frequency; // Set max to the period
OCR1C = frequency >> 1; // Set compare to half the period
TCCR1A = _BV(COM1C1) | _BV(WGM11); // = 0b00001010;
TCCR1B = _BV(WGM13) | _BV(WGM12) | _BV(CS10); // = 0b00011001;
}
for (int i = 0; i < length; i++) {
_delay_us(50000);
}
TCCR1A &= ~(_BV(COM1C1));
}
// This is called at 8000 Hz to load the next sample.
ISR(TIMER1_COMPA_vect) {
if (sample >= sounddata_length) {
if (sample == sounddata_length + lastSample) {
TIMSK1 &= ~_BV(OCIE1A);
// Disable the per-sample timer completely.
TCCR1B &= ~_BV(CS10);
}
else {
OCR1C = sounddata_length + lastSample - sample;
}
}
else {
OCR1C = pgm_read_byte(&sounddata_data[sample]);
}
++sample;
}
void play_notes() {
// Set up Timer 2 to do pulse width modulation on the speaker
// pin.
DDRB |= (1<<7);
PORTB &= ~(1<<7);
// Use internal clock (datasheet p.160)
// ASSR &= ~(_BV(EXCLK) | _BV(AS2));
// Set fast PWM mode (p.157)
TCCR1A |= _BV(WGM21) | _BV(WGM20);
TCCR1B &= ~_BV(WGM22);
// Do non-inverting PWM on pin OC2A (p.155)
// On the Arduino this is pin 11.
TCCR1A = (TCCR2A | _BV(COM2A1)) & ~_BV(COM2A0);
TCCR1A &= ~(_BV(COM2B1) | _BV(COM2B0));
// No prescaler (p.158)
TCCR1B = (TCCR1B & ~(_BV(CS12) | _BV(CS11))) | _BV(CS10);
// Set initial pulse width to the first sample.
OCR1A = pgm_read_byte(&sounddata_data[0]);
cli();
// Set CTC mode (Clear Timer on Compare Match) (p.133)
// Have to set OCR1A *after*, otherwise it gets reset to 0!
TCCR2B = (TCCR2B & ~_BV(WGM13)) | _BV(WGM12);
TCCR2A = TCCR2A & ~(_BV(WGM11) | _BV(WGM10));
// No prescaler (p.134)
TCCR2B = (TCCR2B & ~(_BV(CS12) | _BV(CS11))) | _BV(CS10);
// Set the compare register (OCR1A).
// OCR1A is a 16-bit register, so we have to do this with
// interrupts disabled to be safe.
// OCR2A = F_CPU / SAMPLE_RATE; // 16e6 / 8000 = 2000
OCR2A = 2000;
// Enable interrupt when TCNT1 == OCR1A (p.136)
TIMSK1 |= _BV(OCIE2A);
sample = 0;
sei();
}
void note(int x, float length) {
DDRB |= (1<<1);
int t = (int)(440*pow(2,-x/12.0)); // starting note
for (int y = 0; y < length*1000/t; y++) { // note length
PORTB |= (1<<1);
delay_us(t);
PORTB &= ~(1<<1);
delay_us(t);
}
PORTB &= ~(1<<1);
}
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) && !(PORTB&(1<<1)))
PORTB |= (1<<1);
else if (PORTB&(1<<1))
PORTB &= ~(1<<1);
}
}
PORTB &= ~(1<<1);
}