qmk-firmware/keyboard/planck/beeps.c

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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
void delay_us(int count) {
while(count--) {
_delay_us(1);
}
}
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int voices = 0;
double frequency = 0;
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};
int volumes[8] = {0, 0, 0, 0, 0, 0, 0, 0};
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bool sliding = false;
#define RANGE 1000
volatile int i=0; //elements of the wave
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void beeps() {
play_notes();
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}
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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
}
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void stop_all_notes() {
voices = 0;
TCCR3A = 0;
TCCR3B = 0;
frequency = 0;
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volume = 0;
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for (int i = 0; i < 8; i++) {
frequencies[i] = 0;
volumes[i] = 0;
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}
}
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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;
}
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}
}
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voices--;
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if (voices < 0)
voices = 0;
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if (voices == 0) {
TCCR3A = 0;
TCCR3B = 0;
frequency = 0;
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volume = 0;
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} else {
double freq = frequencies[voices - 1];
int vol = volumes[voices - 1];
if (frequency < freq) {
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sliding = true;
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for (double f = frequency; f <= freq; f += ((freq - frequency) / 500.0)) {
send_freq(f, vol);
}
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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)) {
send_freq(f, vol);
}
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sliding = false;
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}
send_freq(freq, vol);
frequency = freq;
volume = vol;
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}
}
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void init_notes() {
// TCCR1A = (1 << COM1A1) | (0 << COM1A0) | (1 << WGM11) | (1 << WGM10);
// TCCR1B = (1 << COM1B1) | (0 << COM1A0) | (1 << WGM13) | (1 << WGM12) | (0 << CS12) | (0 << CS11) | (1 << CS10);
// DDRC |= (1<<6);
// TCCR3A = (1 << COM3A1) | (0 << COM3A0) | (1 << WGM31) | (0 << WGM30);
// TCCR3B = (1 << WGM33) | (1 << WGM32) | (0 << CS32) | (0 << CS31) | (1 << CS30);
// ICR3 = 0xFFFF;
// OCR3A = (int)((float)wave[i]*ICR3/RANGE); //go to next array element
// cli();
// /* Enable interrupt on timer2 == 127, with clk/8 prescaler. At 16MHz,
// this gives a timer interrupt at 15625Hz. */
// TIMSK3 = (1 << OCIE3A);
// /* clear/reset timer on match */
// // TCCR3A = 1<<WGM31 | 0<<WGM30; CTC mode, reset on match
// // TCCR3B = 0<<CS32 | 1<<CS31 | 0<<CS30; /* clk, /8 prescaler */
// TCCR3A = (1 << COM3A1) | (0 << COM3A0) | (1 << WGM31) | (0 << WGM30);
// TCCR3B = (0 << WGM33) | (0 << WGM32) | (0 << CS32) | (0 << CS31) | (1 << CS30);
// TCCR1A = (1 << COM1A1) | (0 << COM1A0) | (1 << WGM11) | (0 << WGM10);
// TCCR1B = (1 << WGM12) | (0 << CS12) | (0 << CS11) | (1 << CS10);
// // SPCR = 0x50;
// // SPSR = 0x01;
// DDRC |= (1<<6);
// // ICR3 = 0xFFFF;
// // OCR3A=80;
// PORTC |= (1<<6);
// sei();
}
// #define highByte(c) ((c >> 8) & 0x00FF)
// #define lowByte(c) (c & 0x00FF)
ISR(TIMER3_COMPA_vect) {
if (ICR3 > 0 && !sliding) {
switch (position) {
case 0: {
int duty = (((double)F_CPU) / (frequency));
ICR3 = duty; // Set max to the period
OCR3A = duty >> 1; // Set compare to half the period
break;
}
case 1: {
int duty = (((double)F_CPU) / (frequency*2));
ICR3 = duty; // Set max to the period
OCR3A = duty >> 1; // Set compare to half the period
break;
}
case 2: {
int duty = (((double)F_CPU) / (frequency*3));
ICR3 = duty; // Set max to the period
OCR3A = duty >> 1; // Set compare to half the period
break;
}
}
position = (position + 1) % 3;
}
// /* OCR2A has been cleared, per TCCR2A above */
// // OCR3A = 127;
// // pos1 += incr1;
// // pos2 += incr2;
// // pos3 += incr3;
// // sample = sinewave[highByte(pos1)] + sinewave[highByte(pos2)] + sinewave[highByte(pos3)];
// // OCR3A = sample;
// OCR3A=pgm_read_byte(&sinewave[pos1]);
// pos1++;
// // PORTC &= ~(1<<6);
// /* buffered, 1x gain, active mode */
// // SPDR = highByte(sample) | 0x70;
// // while (!(SPSR & (1<<SPIF)));
// // SPDR = lowByte(sample);
// // while (!(SPSR & (1<<SPIF)));
// // PORTC |= (1<<6);
}
void loop() {
}
// ISR(TIMER1_COMPA_vect)
// {
// // if (i<(sizeof(wave)/sizeof(int))) //don't exceed ends of vector... sizeof(wave)
// if (i<pow(2, 10)) //don't exceed ends of vector... sizeof(wave)
// {
// OCR3A = (int)((float)wave[i]*ICR3/RANGE); //go to next array element
// // int x = 1;
// // int y = 5;
// // OCR3A = (int) (round(sin(i*440*pow(2, x/12.0))*.5+.5 + sin(i*440*pow(2, y/12.0))*.5+.5) / 2 * ICR3);
// i++; //increment
// }
// else i=0; //reset
// }
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void play_note(double freq, int vol) {
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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;
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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;
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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
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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PORTC &= ~(1<<6);
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}
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++) {
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if (v & (1 << u) && !(PORTC&(1<<6)))
PORTC |= (1<<6);
else if (PORTC&(1<<6))
PORTC &= ~(1<<6);
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}
}
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PORTC &= ~(1<<6);
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}