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author | Jack Humbert <jack.humb@gmail.com> | 2016-01-11 16:53:33 -0500 |
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committer | Jack Humbert <jack.humb@gmail.com> | 2016-01-11 16:53:33 -0500 |
commit | 29de37d5c0ea9fc6b5539ce4493c7b10a2a7f33f (patch) | |
tree | cecb16f2969a1d250b45d828df1e700bce1d8c40 /quantum/beeps.c | |
parent | 11ce694557389bdde2b5ae15af38fdad3fe77a27 (diff) | |
download | firmware-29de37d5c0ea9fc6b5539ce4493c7b10a2a7f33f.tar.gz firmware-29de37d5c0ea9fc6b5539ce4493c7b10a2a7f33f.tar.bz2 firmware-29de37d5c0ea9fc6b5539ce4493c7b10a2a7f33f.zip |
pwm audio
Diffstat (limited to 'quantum/beeps.c')
-rw-r--r-- | quantum/beeps.c | 231 |
1 files changed, 145 insertions, 86 deletions
diff --git a/quantum/beeps.c b/quantum/beeps.c index 8d1f81f21..edcc84aca 100644 --- a/quantum/beeps.c +++ b/quantum/beeps.c @@ -1,11 +1,20 @@ -#include "beeps.h" +#include <stdio.h> +#include <string.h> #include <math.h> #include <avr/pgmspace.h> #include <avr/interrupt.h> #include <avr/io.h> +#include "beeps.h" +#include "keymap_common.h" +#include "wave.h" + #define PI 3.14159265 +#define SAMPLE_DIVIDER 70 +#define SAMPLE_RATE (2000000.0/SAMPLE_DIVIDER/256) +// Resistor value of 1/ (2 * PI * 10nF * (2000000 hertz / SAMPLE_DIVIDER / 10)) for 10nF cap + void delay_us(int count) { while(count--) { _delay_us(1); @@ -15,7 +24,7 @@ void delay_us(int count) { int voices = 0; double frequency = 0; int volume = 0; -int position = 0; +long position = 0; double frequencies[8] = {0, 0, 0, 0, 0, 0, 0, 0}; int volumes[8] = {0, 0, 0, 0, 0, 0, 0, 0}; @@ -23,6 +32,19 @@ bool sliding = false; #define RANGE 1000 volatile int i=0; //elements of the wave +// uint8_t sine[128]; +// uint8_t tri[128]; +// uint8_t squ[128]; +// uint8_t* sine_start; +// uint8_t* sine_end; +// uint8_t* tri_start; +// uint8_t* tri_end; + +// uint8_t* s_start; +// uint8_t* s_end; +// uint8_t* s_ptr; + + void beeps() { play_notes(); @@ -36,8 +58,7 @@ void send_freq(double freq, int vol) { void stop_all_notes() { voices = 0; - TCCR3A = 0; - TCCR3B = 0; + TIMSK0 &= ~_BV(OCIE0A); frequency = 0; volume = 0; @@ -48,6 +69,7 @@ void stop_all_notes() { } void stop_note(double freq) { + freq = freq / SAMPLE_RATE; for (int i = 7; i >= 0; i--) { if (frequencies[i] == freq) { frequencies[i] = 0; @@ -64,151 +86,176 @@ void stop_note(double freq) { if (voices < 0) voices = 0; if (voices == 0) { - TCCR3A = 0; - TCCR3B = 0; + TIMSK0 &= ~_BV(OCIE0A); frequency = 0; volume = 0; } else { double freq = frequencies[voices - 1]; int vol = volumes[voices - 1]; + double starting_f = frequency; if (frequency < freq) { sliding = true; - for (double f = frequency; f <= freq; f += ((freq - frequency) / 500.0)) { - send_freq(f, vol); + for (double f = starting_f; f <= freq; f += ((freq - starting_f) / 500.0)) { + frequency = f; } sliding = false; } else if (frequency > freq) { sliding = true; - for (double f = frequency; f >= freq; f -= ((frequency - freq) / 500.0)) { - send_freq(f, vol); + for (double f = starting_f; f >= freq; f -= ((starting_f - freq) / 500.0)) { + frequency = f; } sliding = false; } - send_freq(freq, vol); + // send_freq(freq, vol); frequency = freq; volume = vol; } } 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); + // for(int i = 0; i < 128; i++) { + // sine[i] = sin(i * PI / 64) * 128 + 128; + // tri[i] = 256 - abs((i - 64) * 4); + // } + // sine_start = &sine; + // sine_end = &sine + 128; + // tri_start = &tri; + // tri_end = &tri + 128; - // TCCR3A = (1 << COM3A1) | (0 << COM3A0) | (1 << WGM31) | (0 << WGM30); - // TCCR3B = (1 << WGM33) | (1 << WGM32) | (0 << CS32) | (0 << CS31) | (1 << CS30); + // new - // ICR3 = 0xFFFF; - // OCR3A = (int)((float)wave[i]*ICR3/RANGE); //go to next array element + PLLFRQ = _BV(PDIV2); + PLLCSR = _BV(PLLE); + while(!(PLLCSR & _BV(PLOCK))); + PLLFRQ |= _BV(PLLTM0); /* PCK 48MHz */ + + /* Init a fast PWM on Timer4 */ + TCCR4A = _BV(COM4A0) | _BV(PWM4A); /* Clear OC4A on Compare Match */ + TCCR4B = _BV(CS40); /* No prescaling => f = PCK/256 = 187500Hz */ + OCR4A = 0; - // cli(); + /* Enable the OC4A output */ + DDRC |= _BV(PORTC6); - // /* 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); + /* First disable the timer overflow interrupt while we're configuring */ + // TIMSK0 &= ~(1<<TOIE0); + + // /* Configure timer4 in normal mode (pure counting, no PWM etc.) */ + // TCCR0A &= ~((1<<WGM01) | (1<<WGM00)); + // TCCR0B &= ~(1<<WGM02); + // /* Disable Compare Match A interrupt enable (only want overflow) */ + // TIMSK0 &= ~(1<<OCIE0A); + + // TCCR0B |= (1<<CS01); // Set bits + // TCCR0B &= ~(1<<CS00) | ~(1<<CS02); // Clear bit + + // /* Save value globally for later reload in ISR */ + // tcnt0 = 45 - 1; - // 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); + // /* Finally load end enable the timer */ + // TCNT0 = tcnt0; + // TIMSK0 |= (1<<TOIE0); - // sei(); } -// #define highByte(c) ((c >> 8) & 0x00FF) -// #define lowByte(c) (c & 0x00FF) +int max = 0xFF; +float sum = 0; +int value = 128; +float place = 0; -ISR(TIMER3_COMPA_vect) { +ISR(TIMER0_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)]; + // value = *(sine_start+=(long)frequencies[0]); + // OCR4A = value; + // if (sine_start >= sine_end) { + // sine_start = &sine[(sine_start - sine_end) % 128]; + // } -// // OCR3A = sample; + // OCR4A = pgm_read_byte(sine_start); + // // sine_start = &sine[(sine_start - &sine[0] + (int)frequencies[0]) % 128]; + // sine_start += (int)frequencies[0]; + // if (sine_start >= sine_end) { + // sine_start = &sine[(sine_start - sine_end) % 128]; + // } + + // OCR4A = pgm_read_byte(s_ptr); + // s_ptr = s_start + (uint8_t)place; + // OCR4A = pgm_read_byte(s_ptr); + + + // SINE + OCR4A = pgm_read_byte(&sinewave[(uint16_t)place]); + + // SQUARE + // if (((int)place) >= 1024){ + // OCR4A = 0xFF; + // } else { + // OCR4A = 0x00; + // } + + // SAWTOOTH + // OCR4A = (int)place / 4; + + // TRIANGLE + // if (((int)place) >= 1024) { + // OCR4A = (int)place / 2; + // } else { + // OCR4A = 2048 - (int)place / 2; + // } + + place += frequency; + if (place >= SINE_LENGTH) + place -= SINE_LENGTH; + +} -// OCR3A=pgm_read_byte(&sinewave[pos1]); -// pos1++; -// // PORTC &= ~(1<<6); -// /* buffered, 1x gain, active mode */ -// // SPDR = highByte(sample) | 0x70; -// // while (!(SPSR & (1<<SPIF))); +ISR(TIMER0_COMPB_vect) +{ -// // SPDR = lowByte(sample); -// // while (!(SPSR & (1<<SPIF))); + /* Disable the interrupt */ + TIMSK0 &= ~_BV(OCIE0B); -// // PORTC |= (1<<6); } void play_note(double freq, int vol) { + freq = freq / SAMPLE_RATE; 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); + // TCCR3A = (1 << COM3A1) | (0 << COM3A0) | (1 << WGM31) | (1 << WGM30); + // TCCR3B = (0 << WGM33) | (1 << WGM32) | (0 << CS32) | (0 << CS31) | (1 << CS30); + // TIMSK3 = 0x0; if (frequency != 0) { + double starting_f = frequency; if (frequency < freq) { - for (double f = frequency; f <= freq; f += ((freq - frequency) / 500.0)) { - send_freq(f, vol); + for (double f = starting_f; f <= freq; f += ((freq - starting_f) / 500.0)) { + frequency = f; } } else if (frequency > freq) { - for (double f = frequency; f >= freq; f -= ((frequency - freq) / 500.0)) { - send_freq(f, vol); + for (double f = starting_f; f >= freq; f -= ((starting_f - freq) / 500.0)) { + frequency = f; } } } - send_freq(freq, vol); + // send_freq(freq, vol); frequency = freq; volume = vol; frequencies[voices] = frequency; volumes[voices] = volume; voices++; + // position = 0; + // TCNT0 = 0; } // ICR3 = 0xFFFF; // for (int i = 0; i < 10000; i++) { @@ -218,6 +265,18 @@ void play_note(double freq, int vol) { // TCCR3A = 0; // TCCR3B = 0; + + + TIMSK0 &= ~_BV(OCIE0A) | ~_BV(OCIE0B); + + TCCR0A = _BV(WGM01); + TCCR0B = _BV(CS01); + OCR0A = SAMPLE_DIVIDER - 1; + OCR0B = 1; + + TIMSK0 |= _BV(OCIE0A); + // sei(); + } // void note(int x, float length) { |