305 lines
7.1 KiB
C
305 lines
7.1 KiB
C
#include <stdio.h>
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#include <string.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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#include "beeps.h"
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#include "keymap_common.h"
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#include "wave.h"
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#define PI 3.14159265
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#define SAMPLE_DIVIDER 70
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#define SAMPLE_RATE (2000000.0/SAMPLE_DIVIDER/256)
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// Resistor value of 1/ (2 * PI * 10nF * (2000000 hertz / SAMPLE_DIVIDER / 10)) for 10nF cap
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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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long 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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// uint8_t sine[128];
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// uint8_t tri[128];
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// uint8_t squ[128];
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// uint8_t* sine_start;
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// uint8_t* sine_end;
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// uint8_t* tri_start;
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// uint8_t* tri_end;
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// uint8_t* s_start;
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// uint8_t* s_end;
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// uint8_t* s_ptr;
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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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TIMSK0 &= ~_BV(OCIE0A);
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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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freq = freq / SAMPLE_RATE;
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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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TIMSK0 &= ~_BV(OCIE0A);
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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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double starting_f = frequency;
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if (frequency < freq) {
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sliding = true;
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for (double f = starting_f; f <= freq; f += ((freq - starting_f) / 500.0)) {
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frequency = f;
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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 = starting_f; f >= freq; f -= ((starting_f - freq) / 500.0)) {
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frequency = f;
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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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// for(int i = 0; i < 128; i++) {
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// sine[i] = sin(i * PI / 64) * 128 + 128;
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// tri[i] = 256 - abs((i - 64) * 4);
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// }
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// sine_start = &sine;
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// sine_end = &sine + 128;
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// tri_start = &tri;
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// tri_end = &tri + 128;
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// new
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PLLFRQ = _BV(PDIV2);
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PLLCSR = _BV(PLLE);
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while(!(PLLCSR & _BV(PLOCK)));
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PLLFRQ |= _BV(PLLTM0); /* PCK 48MHz */
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/* Init a fast PWM on Timer4 */
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TCCR4A = _BV(COM4A0) | _BV(PWM4A); /* Clear OC4A on Compare Match */
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TCCR4B = _BV(CS40); /* No prescaling => f = PCK/256 = 187500Hz */
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OCR4A = 0;
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/* Enable the OC4A output */
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DDRC |= _BV(PORTC6);
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/* First disable the timer overflow interrupt while we're configuring */
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// TIMSK0 &= ~(1<<TOIE0);
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// /* Configure timer4 in normal mode (pure counting, no PWM etc.) */
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// TCCR0A &= ~((1<<WGM01) | (1<<WGM00));
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// TCCR0B &= ~(1<<WGM02);
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// /* Disable Compare Match A interrupt enable (only want overflow) */
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// TIMSK0 &= ~(1<<OCIE0A);
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// TCCR0B |= (1<<CS01); // Set bits
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// TCCR0B &= ~(1<<CS00) | ~(1<<CS02); // Clear bit
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// /* Save value globally for later reload in ISR */
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// tcnt0 = 45 - 1;
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// /* Finally load end enable the timer */
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// TCNT0 = tcnt0;
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// TIMSK0 |= (1<<TOIE0);
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}
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int max = 0xFF;
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float sum = 0;
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int value = 128;
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float place = 0;
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ISR(TIMER0_COMPA_vect) {
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// value = *(sine_start+=(long)frequencies[0]);
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// OCR4A = value;
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// if (sine_start >= sine_end) {
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// sine_start = &sine[(sine_start - sine_end) % 128];
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// }
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// OCR4A = pgm_read_byte(sine_start);
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// // sine_start = &sine[(sine_start - &sine[0] + (int)frequencies[0]) % 128];
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// sine_start += (int)frequencies[0];
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// if (sine_start >= sine_end) {
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// sine_start = &sine[(sine_start - sine_end) % 128];
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// }
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// OCR4A = pgm_read_byte(s_ptr);
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// s_ptr = s_start + (uint8_t)place;
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// OCR4A = pgm_read_byte(s_ptr);
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// SINE
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OCR4A = pgm_read_byte(&sinewave[(uint16_t)place]);
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// SQUARE
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// if (((int)place) >= 1024){
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// OCR4A = 0xFF;
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// } else {
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// OCR4A = 0x00;
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// }
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// SAWTOOTH
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// OCR4A = (int)place / 4;
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// TRIANGLE
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// if (((int)place) >= 1024) {
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// OCR4A = (int)place / 2;
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// } else {
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// OCR4A = 2048 - (int)place / 2;
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// }
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place += frequency;
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if (place >= SINE_LENGTH)
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place -= SINE_LENGTH;
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}
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ISR(TIMER0_COMPB_vect)
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{
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/* Disable the interrupt */
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TIMSK0 &= ~_BV(OCIE0B);
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}
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void play_note(double freq, int vol) {
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freq = freq / SAMPLE_RATE;
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if (freq > 0) {
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// TCCR3A = (1 << COM3A1) | (0 << COM3A0) | (1 << WGM31) | (1 << WGM30);
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// TCCR3B = (0 << WGM33) | (1 << WGM32) | (0 << CS32) | (0 << CS31) | (1 << CS30);
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// TIMSK3 = 0x0;
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if (frequency != 0) {
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double starting_f = frequency;
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if (frequency < freq) {
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for (double f = starting_f; f <= freq; f += ((freq - starting_f) / 500.0)) {
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frequency = f;
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}
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} else if (frequency > freq) {
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for (double f = starting_f; f >= freq; f -= ((starting_f - freq) / 500.0)) {
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frequency = f;
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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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// position = 0;
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// TCNT0 = 0;
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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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TIMSK0 &= ~_BV(OCIE0A) | ~_BV(OCIE0B);
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TCCR0A = _BV(WGM01);
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TCCR0B = _BV(CS01);
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OCR0A = SAMPLE_DIVIDER - 1;
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OCR0B = 1;
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TIMSK0 |= _BV(OCIE0A);
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// sei();
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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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