summaryrefslogtreecommitdiffstats
path: root/quantum/audio.c
blob: 3a3a1a491062961a724d2de4ea10d641630098f8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
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

}