Merge branch 'master' into flicker-fix

1 files changed, 362 insertions, 0 deletions

diff --git a/quantum/audio.c b/quantum/audio.c
new file mode 100644
index 0000000000..3a3a1a4910
--- /dev/null
+++ b/quantum/audio.c
@@ -0,0 +1,362 @@
+#include <stdio.h>
+#include <string.h>
+#include <math.h>
+#include <avr/pgmspace.h>
+#include <avr/interrupt.h>
+#include <avr/io.h>
+
+#include "audio.h"
+#include "keymap_common.h"
+
+#define PI 3.14159265
+
+// #define PWM_AUDIO
+
+#ifdef PWM_AUDIO
+    #include "wave.h"
+    #define SAMPLE_DIVIDER 39
+    #define SAMPLE_RATE (2000000.0/SAMPLE_DIVIDER/2048)
+    // Resistor value of 1/ (2 * PI * 10nF * (2000000 hertz / SAMPLE_DIVIDER / 10)) for 10nF cap
+#endif
+
+void delay_us(int count) {
+  while(count--) {
+    _delay_us(1);
+  }
+}
+
+int voices = 0;
+int voice_place = 0;
+double frequency = 0;
+int volume = 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};
+bool sliding = false;
+
+int max = 0xFF;
+float sum = 0;
+int value = 128;
+float place = 0;
+float places[8] = {0, 0, 0, 0, 0, 0, 0, 0};
+
+uint16_t place_int = 0;
+bool repeat = true;
+uint8_t * sample;
+uint16_t sample_length = 0;
+
+
+bool notes = false;
+bool note = false;
+float note_frequency = 0;
+float note_length = 0;
+uint16_t note_position = 0;
+float (* notes_pointer)[][2];
+uint8_t notes_length;
+bool notes_repeat;
+uint8_t current_note = 0;
+
+void stop_all_notes() {
+    voices = 0;
+    #ifdef PWM_AUDIO
+        TIMSK3 &= ~_BV(OCIE3A);
+    #else
+        TIMSK3 &= ~_BV(OCIE3A);
+        TCCR3A &= ~_BV(COM3A1);
+    #endif
+    notes = false;
+    note = false;
+    frequency = 0;
+    volume = 0;
+
+    for (int i = 0; i < 8; i++) {
+        frequencies[i] = 0;
+        volumes[i] = 0;
+    }
+}
+
+void stop_note(double freq) {
+    #ifdef PWM_AUDIO
+        freq = freq / SAMPLE_RATE;
+    #endif
+    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;
+            }
+        }
+    }
+    voices--;
+    if (voices < 0)
+        voices = 0;
+    if (voices == 0) {
+        #ifdef PWM_AUDIO
+            TIMSK3 &= ~_BV(OCIE3A);
+        #else
+            TIMSK3 &= ~_BV(OCIE3A);
+            TCCR3A &= ~_BV(COM3A1);
+        #endif
+        frequency = 0;
+        volume = 0;
+        note = false;
+    } else {
+        double freq = frequencies[voices - 1];
+        int vol = volumes[voices - 1];
+        double starting_f = frequency;
+        if (frequency < freq) {
+            sliding = true;
+            for (double f = starting_f; f <= freq; f += ((freq - starting_f) / 2000.0)) {
+                frequency = f;
+            }
+            sliding = false;
+        } else if (frequency > freq) {
+            sliding = true;
+            for (double f = starting_f; f >= freq; f -= ((starting_f - freq) / 2000.0)) {
+                frequency = f;
+            }
+            sliding = false;
+        }
+        frequency = freq;
+        volume = vol;
+    }
+}
+
+void init_notes() {
+
+    #ifdef PWM_AUDIO
+        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;
+
+        /* Enable the OC4A output */
+        DDRC |= _BV(PORTC6);
+
+        TIMSK3 &= ~_BV(OCIE3A); // Turn off 3A interputs
+        
+        TCCR3A = 0x0; // Options not needed
+        TCCR3B = _BV(CS31) | _BV(CS30) | _BV(WGM32); // 64th prescaling and CTC
+        OCR3A = SAMPLE_DIVIDER - 1; // Correct count/compare, related to sample playback
+    #else
+        DDRC |= _BV(PORTC6);
+
+        TIMSK3 &= ~_BV(OCIE3A); // Turn off 3A interputs
+
+        TCCR3A = (0 << COM3A1) | (0 << COM3A0) | (1 << WGM31) | (0 << WGM30);
+        TCCR3B = (1 << WGM33) | (1 << WGM32) | (0 << CS32) | (1 << CS31) | (0 << CS30);
+    #endif
+}
+
+
+ISR(TIMER3_COMPA_vect) {
+
+    if (note) {
+        #ifdef PWM_AUDIO
+            if (voices == 1) {
+                // SINE
+                OCR4A = pgm_read_byte(&sinewave[(uint16_t)place]) >> 2;
+            
+                // SQUARE
+                // if (((int)place) >= 1024){
+                //     OCR4A = 0xFF >> 2;
+                // } 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;
+
+            } else {
+                int sum = 0;
+                for (int i = 0; i < voices; i++) {
+                    // SINE
+                    sum += pgm_read_byte(&sinewave[(uint16_t)places[i]]) >> 2;
+
+                    // SQUARE
+                    // if (((int)places[i]) >= 1024){
+                    //     sum += 0xFF >> 2;
+                    // } else {
+                    //     sum += 0x00;
+                    // }
+
+                    places[i] += frequencies[i];
+
+                    if (places[i] >= SINE_LENGTH)
+                        places[i] -= SINE_LENGTH;
+                }
+                OCR4A = sum;
+            }
+        #else
+            if (frequency > 0) {
+                // ICR3 = (int)(((double)F_CPU) / frequency); // Set max to the period
+                // OCR3A = (int)(((double)F_CPU) / frequency) >> 1; // Set compare to half the period
+                if (place > 10) {
+                    voice_place = (voice_place + 1) % voices;
+                    place = 0.0;
+                }
+                ICR3 = (int)(((double)F_CPU) / frequencies[voice_place]); // Set max to the period
+                OCR3A = (int)(((double)F_CPU) / frequencies[voice_place]) >> 1; // Set compare to half the period
+                place++;
+            }
+        #endif
+    }
+
+    // SAMPLE
+    // OCR4A = pgm_read_byte(&sample[(uint16_t)place_int]);
+
+    // place_int++;
+
+    // if (place_int >= sample_length)
+    //     if (repeat)
+    //         place_int -= sample_length;
+    //     else
+    //         TIMSK3 &= ~_BV(OCIE3A);
+
+
+    if (notes) {
+        #ifdef PWM_AUDIO
+            OCR4A = pgm_read_byte(&sinewave[(uint16_t)place]) >> 0;
+
+            place += note_frequency;
+            if (place >= SINE_LENGTH)
+                place -= SINE_LENGTH;
+        #else
+            if (note_frequency > 0) {
+                ICR3 = (int)(((double)F_CPU) / note_frequency); // Set max to the period
+                OCR3A = (int)(((double)F_CPU) / note_frequency) >> 1; // Set compare to half the period
+            }
+        #endif
+
+
+        note_position++;
+        if (note_position >= note_length) {
+            current_note++;
+            if (current_note >= notes_length) {
+                if (notes_repeat) {
+                    current_note = 0;
+                } else {
+                    #ifdef PWM_AUDIO
+                        TIMSK3 &= ~_BV(OCIE3A);
+                    #else
+                        TIMSK3 &= ~_BV(OCIE3A);
+                        TCCR3A &= ~_BV(COM3A1);
+                    #endif
+                    notes = false;
+                    return;
+                }
+            }
+            #ifdef PWM_AUDIO
+                note_frequency = (*notes_pointer)[current_note][0] / SAMPLE_RATE;
+                note_length = (*notes_pointer)[current_note][1];
+            #else
+                note_frequency = (*notes_pointer)[current_note][0];
+                note_length = (*notes_pointer)[current_note][1] / 4;
+            #endif
+            note_position = 0;
+        }
+
+    }
+
+}
+
+void play_notes(float (*np)[][2], uint8_t n_length, bool n_repeat) {
+    if (note)
+        stop_all_notes();
+    notes = true;
+
+    notes_pointer = np;
+    notes_length = n_length;
+    notes_repeat = n_repeat;
+
+    place = 0;
+    current_note = 0;
+    #ifdef PWM_AUDIO
+        note_frequency = (*notes_pointer)[current_note][0] / SAMPLE_RATE;
+        note_length = (*notes_pointer)[current_note][1];
+    #else
+        note_frequency = (*notes_pointer)[current_note][0];
+        note_length = (*notes_pointer)[current_note][1] / 4;
+    #endif
+    note_position = 0;
+
+
+    #ifdef PWM_AUDIO
+        TIMSK3 |= _BV(OCIE3A);
+    #else
+        TIMSK3 |= _BV(OCIE3A);
+        TCCR3A |= _BV(COM3A1);
+    #endif
+}
+
+void play_sample(uint8_t * s, uint16_t l, bool r) {
+    stop_all_notes();
+    place_int = 0;
+    sample = s;
+    sample_length = l;
+    repeat = r;
+
+    #ifdef PWM_AUDIO
+        TIMSK3 |= _BV(OCIE3A);
+    #else
+    #endif
+}
+
+void play_note(double freq, int vol) {
+    if (notes)
+        stop_all_notes();
+    note = true;
+    #ifdef PWM_AUDIO
+        freq = freq / SAMPLE_RATE;
+    #endif
+    if (freq > 0) {
+        if (frequency != 0) {
+            double starting_f = frequency;
+            if (frequency < freq) {
+                for (double f = starting_f; f <= freq; f += ((freq - starting_f) / 2000.0)) {   
+                    frequency = f;
+                }
+            } else if (frequency > freq) {
+                for (double f = starting_f; f >= freq; f -= ((starting_f - freq) / 2000.0)) {
+                    frequency = f;
+                }
+            }
+        }
+        frequency = freq;
+        volume = vol;
+
+        frequencies[voices] = frequency;
+        volumes[voices] = volume;
+        voices++;
+    }
+
+    #ifdef PWM_AUDIO
+        TIMSK3 |= _BV(OCIE3A);
+    #else
+        TIMSK3 |= _BV(OCIE3A);
+        TCCR3A |= _BV(COM3A1);
+    #endif
+
+}
\ No newline at end of file