From 29de37d5c0ea9fc6b5539ce4493c7b10a2a7f33f Mon Sep 17 00:00:00 2001 From: Jack Humbert Date: Mon, 11 Jan 2016 16:53:33 -0500 Subject: pwm audio --- quantum/beeps.c | 231 +++++++++++++++++++++++++++---------------- quantum/beeps.h | 2 +- quantum/keymap_midi.c | 21 ++-- quantum/keymap_midi.h | 2 + quantum/wave.h | 265 ++++++++++++++++++++++++++++++++++++++++++++++++++ 5 files changed, 423 insertions(+), 98 deletions(-) create mode 100644 quantum/wave.h (limited to 'quantum') diff --git a/quantum/beeps.c b/quantum/beeps.c index 8d1f81f210..edcc84aca4 100644 --- a/quantum/beeps.c +++ b/quantum/beeps.c @@ -1,11 +1,20 @@ -#include "beeps.h" +#include +#include #include #include #include #include +#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<> 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< 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) { diff --git a/quantum/beeps.h b/quantum/beeps.h index 378983c605..a7fcf6c23c 100644 --- a/quantum/beeps.h +++ b/quantum/beeps.h @@ -9,4 +9,4 @@ void true_note(float x, float y, float length); void play_note(double freq, int vol); void stop_note(double freq); void stop_all_notes(); -void init_notes(); \ No newline at end of file +void init_notes(); diff --git a/quantum/keymap_midi.c b/quantum/keymap_midi.c index b7eba3ab76..3a1408e220 100644 --- a/quantum/keymap_midi.c +++ b/quantum/keymap_midi.c @@ -17,7 +17,6 @@ along with this program. If not, see . #include "keymap_common.h" #include "keymap_midi.h" -#include uint8_t starting_note = 0x0C; int offset = 7; @@ -35,7 +34,7 @@ void action_function(keyrecord_t *record, uint8_t id, uint8_t opt) if (record->event.key.col == (MATRIX_COLS - 1) && record->event.key.row == (MATRIX_ROWS - 1)) { if (record->event.pressed) { starting_note++; - play_note(((double)261.6)*pow(2.0, -1.0)*pow(2.0,(starting_note + SCALE[0 + offset])/12.0+(MATRIX_ROWS - 1)), 0xC); + play_note(((double)261.626)*pow(2.0, -1.0)*pow(2.0,(starting_note + SCALE[0 + offset])/12.0+(MATRIX_ROWS - 1)), 0xC); midi_send_cc(&midi_device, 0, 0x7B, 0); midi_send_cc(&midi_device, 1, 0x7B, 0); midi_send_cc(&midi_device, 2, 0x7B, 0); @@ -43,7 +42,7 @@ void action_function(keyrecord_t *record, uint8_t id, uint8_t opt) midi_send_cc(&midi_device, 4, 0x7B, 0); return; } else { - stop_note(((double)261.6)*pow(2.0, -1.0)*pow(2.0,(starting_note + SCALE[0 + offset])/12.0+(MATRIX_ROWS - 1))); + stop_note(((double)261.626)*pow(2.0, -1.0)*pow(2.0,(starting_note + SCALE[0 + offset])/12.0+(MATRIX_ROWS - 1))); stop_all_notes(); return; } @@ -51,7 +50,7 @@ void action_function(keyrecord_t *record, uint8_t id, uint8_t opt) if (record->event.key.col == (MATRIX_COLS - 2) && record->event.key.row == (MATRIX_ROWS - 1)) { if (record->event.pressed) { starting_note--; - play_note(((double)261.6)*pow(2.0, -1.0)*pow(2.0,(starting_note + SCALE[0 + offset])/12.0+(MATRIX_ROWS - 1)), 0xC); + play_note(((double)261.626)*pow(2.0, -1.0)*pow(2.0,(starting_note + SCALE[0 + offset])/12.0+(MATRIX_ROWS - 1)), 0xC); midi_send_cc(&midi_device, 0, 0x7B, 0); midi_send_cc(&midi_device, 1, 0x7B, 0); midi_send_cc(&midi_device, 2, 0x7B, 0); @@ -59,7 +58,7 @@ void action_function(keyrecord_t *record, uint8_t id, uint8_t opt) midi_send_cc(&midi_device, 4, 0x7B, 0); return; } else { - stop_note(((double)261.6)*pow(2.0, -1.0)*pow(2.0,(starting_note + SCALE[0 + offset])/12.0+(MATRIX_ROWS - 1))); + stop_note(((double)261.626)*pow(2.0, -1.0)*pow(2.0,(starting_note + SCALE[0 + offset])/12.0+(MATRIX_ROWS - 1))); stop_all_notes(); return; } @@ -74,9 +73,9 @@ void action_function(keyrecord_t *record, uint8_t id, uint8_t opt) midi_send_cc(&midi_device, 4, 0x7B, 0); stop_all_notes(); for (int i = 0; i <= 7; i++) { - play_note(((double)261.6)*pow(2.0, -1.0)*pow(2.0,(starting_note + SCALE[i + offset])/12.0+(MATRIX_ROWS - 1)), 0xC); + play_note(((double)261.626)*pow(2.0, -1.0)*pow(2.0,(starting_note + SCALE[i + offset])/12.0+(MATRIX_ROWS - 1)), 0xC); _delay_us(80000); - stop_note(((double)261.6)*pow(2.0, -1.0)*pow(2.0,(starting_note + SCALE[i + offset])/12.0+(MATRIX_ROWS - 1))); + stop_note(((double)261.626)*pow(2.0, -1.0)*pow(2.0,(starting_note + SCALE[i + offset])/12.0+(MATRIX_ROWS - 1))); _delay_us(8000); } return; @@ -90,9 +89,9 @@ void action_function(keyrecord_t *record, uint8_t id, uint8_t opt) midi_send_cc(&midi_device, 4, 0x7B, 0); stop_all_notes(); for (int i = 0; i <= 7; i++) { - play_note(((double)261.6)*pow(2.0, -1.0)*pow(2.0,(starting_note + SCALE[i + offset])/12.0+(MATRIX_ROWS - 1)), 0xC); + play_note(((double)261.626)*pow(2.0, -1.0)*pow(2.0,(starting_note + SCALE[i + offset])/12.0+(MATRIX_ROWS - 1)), 0xC); _delay_us(80000); - stop_note(((double)261.6)*pow(2.0, -1.0)*pow(2.0,(starting_note + SCALE[i + offset])/12.0+(MATRIX_ROWS - 1))); + stop_note(((double)261.626)*pow(2.0, -1.0)*pow(2.0,(starting_note + SCALE[i + offset])/12.0+(MATRIX_ROWS - 1))); _delay_us(8000); } return; @@ -101,10 +100,10 @@ void action_function(keyrecord_t *record, uint8_t id, uint8_t opt) if (record->event.pressed) { // midi_send_noteon(&midi_device, record->event.key.row, starting_note + SCALE[record->event.key.col], 127); midi_send_noteon(&midi_device, 0, (starting_note + SCALE[record->event.key.col + offset])+12*(MATRIX_ROWS - record->event.key.row), 127); - play_note(((double)261.6)*pow(2.0, -1.0)*pow(2.0,(starting_note + SCALE[record->event.key.col + offset])/12.0+(MATRIX_ROWS - record->event.key.row)), 0xF); + play_note(((double)261.626)*pow(2.0, 0.0)*pow(2.0,(starting_note + SCALE[record->event.key.col + offset])/12.0+(MATRIX_ROWS - record->event.key.row)), 0xF); } else { // midi_send_noteoff(&midi_device, record->event.key.row, starting_note + SCALE[record->event.key.col], 127); midi_send_noteoff(&midi_device, 0, (starting_note + SCALE[record->event.key.col + offset])+12*(MATRIX_ROWS - record->event.key.row), 127); - stop_note(((double)261.6)*pow(2.0, -1.0)*pow(2.0,(starting_note + SCALE[record->event.key.col + offset])/12.0+(MATRIX_ROWS - record->event.key.row))); + stop_note(((double)261.626)*pow(2.0, 0.0)*pow(2.0,(starting_note + SCALE[record->event.key.col + offset])/12.0+(MATRIX_ROWS - record->event.key.row))); } } \ No newline at end of file diff --git a/quantum/keymap_midi.h b/quantum/keymap_midi.h index c5917f884e..a89420ce2a 100644 --- a/quantum/keymap_midi.h +++ b/quantum/keymap_midi.h @@ -18,6 +18,8 @@ along with this program. If not, see . #ifndef KEYMAP_MIDI_H #define KEYMAP_MIDI_H +#include + #define MIDI 0x6000 #define MIDI12 0x6000, 0x6000, 0x6000, 0x6000, 0x6000, 0x6000, 0x6000, 0x6000, 0x6000, 0x6000, 0x6000, 0x6000 diff --git a/quantum/wave.h b/quantum/wave.h new file mode 100644 index 0000000000..6ebc348519 --- /dev/null +++ b/quantum/wave.h @@ -0,0 +1,265 @@ +#include +#include +#include + +#define SINE_LENGTH 2048 + +const uint8_t sinewave[] PROGMEM= //2048 values +{ +0x80,0x80,0x80,0x81,0x81,0x81,0x82,0x82, +0x83,0x83,0x83,0x84,0x84,0x85,0x85,0x85, +0x86,0x86,0x87,0x87,0x87,0x88,0x88,0x88, +0x89,0x89,0x8a,0x8a,0x8a,0x8b,0x8b,0x8c, +0x8c,0x8c,0x8d,0x8d,0x8e,0x8e,0x8e,0x8f, +0x8f,0x8f,0x90,0x90,0x91,0x91,0x91,0x92, +0x92,0x93,0x93,0x93,0x94,0x94,0x95,0x95, +0x95,0x96,0x96,0x96,0x97,0x97,0x98,0x98, +0x98,0x99,0x99,0x9a,0x9a,0x9a,0x9b,0x9b, +0x9b,0x9c,0x9c,0x9d,0x9d,0x9d,0x9e,0x9e, +0x9e,0x9f,0x9f,0xa0,0xa0,0xa0,0xa1,0xa1, +0xa2,0xa2,0xa2,0xa3,0xa3,0xa3,0xa4,0xa4, 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