pwm audio

5 files changed, 423 insertions, 98 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) {
diff --git a/quantum/beeps.h b/quantum/beeps.h
index 378983c60..a7fcf6c23 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 b7eba3ab7..3a1408e22 100644
--- a/quantum/keymap_midi.c
+++ b/quantum/keymap_midi.c
@@ -17,7 +17,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 #include "keymap_common.h"
 #include "keymap_midi.h"
-#include <lufa.h>
 
 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 c5917f884..a89420ce2 100644
--- a/quantum/keymap_midi.h
+++ b/quantum/keymap_midi.h
@@ -18,6 +18,8 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #ifndef KEYMAP_MIDI_H
 #define KEYMAP_MIDI_H
 
+#include <lufa.h>
+
 #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 000000000..6ebc34851
--- /dev/null
+++ b/quantum/wave.h
@@ -0,0 +1,265 @@
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include <avr/pgmspace.h>
+
+#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,
+0xa5,0xa5,0xa5,0xa6,0xa6,0xa6,0xa7,0xa7,
+0xa7,0xa8,0xa8,0xa9,0xa9,0xa9,0xaa,0xaa,
+0xaa,0xab,0xab,0xac,0xac,0xac,0xad,0xad,
+0xad,0xae,0xae,0xae,0xaf,0xaf,0xb0,0xb0,
+0xb0,0xb1,0xb1,0xb1,0xb2,0xb2,0xb2,0xb3,
+0xb3,0xb4,0xb4,0xb4,0xb5,0xb5,0xb5,0xb6,
+0xb6,0xb6,0xb7,0xb7,0xb7,0xb8,0xb8,0xb8,
+0xb9,0xb9,0xba,0xba,0xba,0xbb,0xbb,0xbb,
+0xbc,0xbc,0xbc,0xbd,0xbd,0xbd,0xbe,0xbe,
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\ No newline at end of file