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-rw-r--r--quantum/audio.c362
1 files changed, 362 insertions, 0 deletions
diff --git a/quantum/audio.c b/quantum/audio.c
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1#include <stdio.h>
2#include <string.h>
3#include <math.h>
4#include <avr/pgmspace.h>
5#include <avr/interrupt.h>
6#include <avr/io.h>
7
8#include "audio.h"
9#include "keymap_common.h"
10
11#define PI 3.14159265
12
13// #define PWM_AUDIO
14
15#ifdef PWM_AUDIO
16 #include "wave.h"
17 #define SAMPLE_DIVIDER 39
18 #define SAMPLE_RATE (2000000.0/SAMPLE_DIVIDER/2048)
19 // Resistor value of 1/ (2 * PI * 10nF * (2000000 hertz / SAMPLE_DIVIDER / 10)) for 10nF cap
20#endif
21
22void delay_us(int count) {
23 while(count--) {
24 _delay_us(1);
25 }
26}
27
28int voices = 0;
29int voice_place = 0;
30double frequency = 0;
31int volume = 0;
32long position = 0;
33
34double frequencies[8] = {0, 0, 0, 0, 0, 0, 0, 0};
35int volumes[8] = {0, 0, 0, 0, 0, 0, 0, 0};
36bool sliding = false;
37
38int max = 0xFF;
39float sum = 0;
40int value = 128;
41float place = 0;
42float places[8] = {0, 0, 0, 0, 0, 0, 0, 0};
43
44uint16_t place_int = 0;
45bool repeat = true;
46uint8_t * sample;
47uint16_t sample_length = 0;
48
49
50bool notes = false;
51bool note = false;
52float note_frequency = 0;
53float note_length = 0;
54uint16_t note_position = 0;
55float (* notes_pointer)[][2];
56uint8_t notes_length;
57bool notes_repeat;
58uint8_t current_note = 0;
59
60void stop_all_notes() {
61 voices = 0;
62 #ifdef PWM_AUDIO
63 TIMSK3 &= ~_BV(OCIE3A);
64 #else
65 TIMSK3 &= ~_BV(OCIE3A);
66 TCCR3A &= ~_BV(COM3A1);
67 #endif
68 notes = false;
69 note = false;
70 frequency = 0;
71 volume = 0;
72
73 for (int i = 0; i < 8; i++) {
74 frequencies[i] = 0;
75 volumes[i] = 0;
76 }
77}
78
79void stop_note(double freq) {
80 #ifdef PWM_AUDIO
81 freq = freq / SAMPLE_RATE;
82 #endif
83 for (int i = 7; i >= 0; i--) {
84 if (frequencies[i] == freq) {
85 frequencies[i] = 0;
86 volumes[i] = 0;
87 for (int j = i; (j < 7); j++) {
88 frequencies[j] = frequencies[j+1];
89 frequencies[j+1] = 0;
90 volumes[j] = volumes[j+1];
91 volumes[j+1] = 0;
92 }
93 }
94 }
95 voices--;
96 if (voices < 0)
97 voices = 0;
98 if (voices == 0) {
99 #ifdef PWM_AUDIO
100 TIMSK3 &= ~_BV(OCIE3A);
101 #else
102 TIMSK3 &= ~_BV(OCIE3A);
103 TCCR3A &= ~_BV(COM3A1);
104 #endif
105 frequency = 0;
106 volume = 0;
107 note = false;
108 } else {
109 double freq = frequencies[voices - 1];
110 int vol = volumes[voices - 1];
111 double starting_f = frequency;
112 if (frequency < freq) {
113 sliding = true;
114 for (double f = starting_f; f <= freq; f += ((freq - starting_f) / 2000.0)) {
115 frequency = f;
116 }
117 sliding = false;
118 } else if (frequency > freq) {
119 sliding = true;
120 for (double f = starting_f; f >= freq; f -= ((starting_f - freq) / 2000.0)) {
121 frequency = f;
122 }
123 sliding = false;
124 }
125 frequency = freq;
126 volume = vol;
127 }
128}
129
130void init_notes() {
131
132 #ifdef PWM_AUDIO
133 PLLFRQ = _BV(PDIV2);
134 PLLCSR = _BV(PLLE);
135 while(!(PLLCSR & _BV(PLOCK)));
136 PLLFRQ |= _BV(PLLTM0); /* PCK 48MHz */
137
138 /* Init a fast PWM on Timer4 */
139 TCCR4A = _BV(COM4A0) | _BV(PWM4A); /* Clear OC4A on Compare Match */
140 TCCR4B = _BV(CS40); /* No prescaling => f = PCK/256 = 187500Hz */
141 OCR4A = 0;
142
143 /* Enable the OC4A output */
144 DDRC |= _BV(PORTC6);
145
146 TIMSK3 &= ~_BV(OCIE3A); // Turn off 3A interputs
147
148 TCCR3A = 0x0; // Options not needed
149 TCCR3B = _BV(CS31) | _BV(CS30) | _BV(WGM32); // 64th prescaling and CTC
150 OCR3A = SAMPLE_DIVIDER - 1; // Correct count/compare, related to sample playback
151 #else
152 DDRC |= _BV(PORTC6);
153
154 TIMSK3 &= ~_BV(OCIE3A); // Turn off 3A interputs
155
156 TCCR3A = (0 << COM3A1) | (0 << COM3A0) | (1 << WGM31) | (0 << WGM30);
157 TCCR3B = (1 << WGM33) | (1 << WGM32) | (0 << CS32) | (1 << CS31) | (0 << CS30);
158 #endif
159}
160
161
162ISR(TIMER3_COMPA_vect) {
163
164 if (note) {
165 #ifdef PWM_AUDIO
166 if (voices == 1) {
167 // SINE
168 OCR4A = pgm_read_byte(&sinewave[(uint16_t)place]) >> 2;
169
170 // SQUARE
171 // if (((int)place) >= 1024){
172 // OCR4A = 0xFF >> 2;
173 // } else {
174 // OCR4A = 0x00;
175 // }
176
177 // SAWTOOTH
178 // OCR4A = (int)place / 4;
179
180 // TRIANGLE
181 // if (((int)place) >= 1024) {
182 // OCR4A = (int)place / 2;
183 // } else {
184 // OCR4A = 2048 - (int)place / 2;
185 // }
186
187 place += frequency;
188
189 if (place >= SINE_LENGTH)
190 place -= SINE_LENGTH;
191
192 } else {
193 int sum = 0;
194 for (int i = 0; i < voices; i++) {
195 // SINE
196 sum += pgm_read_byte(&sinewave[(uint16_t)places[i]]) >> 2;
197
198 // SQUARE
199 // if (((int)places[i]) >= 1024){
200 // sum += 0xFF >> 2;
201 // } else {
202 // sum += 0x00;
203 // }
204
205 places[i] += frequencies[i];
206
207 if (places[i] >= SINE_LENGTH)
208 places[i] -= SINE_LENGTH;
209 }
210 OCR4A = sum;
211 }
212 #else
213 if (frequency > 0) {
214 // ICR3 = (int)(((double)F_CPU) / frequency); // Set max to the period
215 // OCR3A = (int)(((double)F_CPU) / frequency) >> 1; // Set compare to half the period
216 if (place > 10) {
217 voice_place = (voice_place + 1) % voices;
218 place = 0.0;
219 }
220 ICR3 = (int)(((double)F_CPU) / frequencies[voice_place]); // Set max to the period
221 OCR3A = (int)(((double)F_CPU) / frequencies[voice_place]) >> 1; // Set compare to half the period
222 place++;
223 }
224 #endif
225 }
226
227 // SAMPLE
228 // OCR4A = pgm_read_byte(&sample[(uint16_t)place_int]);
229
230 // place_int++;
231
232 // if (place_int >= sample_length)
233 // if (repeat)
234 // place_int -= sample_length;
235 // else
236 // TIMSK3 &= ~_BV(OCIE3A);
237
238
239 if (notes) {
240 #ifdef PWM_AUDIO
241 OCR4A = pgm_read_byte(&sinewave[(uint16_t)place]) >> 0;
242
243 place += note_frequency;
244 if (place >= SINE_LENGTH)
245 place -= SINE_LENGTH;
246 #else
247 if (note_frequency > 0) {
248 ICR3 = (int)(((double)F_CPU) / note_frequency); // Set max to the period
249 OCR3A = (int)(((double)F_CPU) / note_frequency) >> 1; // Set compare to half the period
250 }
251 #endif
252
253
254 note_position++;
255 if (note_position >= note_length) {
256 current_note++;
257 if (current_note >= notes_length) {
258 if (notes_repeat) {
259 current_note = 0;
260 } else {
261 #ifdef PWM_AUDIO
262 TIMSK3 &= ~_BV(OCIE3A);
263 #else
264 TIMSK3 &= ~_BV(OCIE3A);
265 TCCR3A &= ~_BV(COM3A1);
266 #endif
267 notes = false;
268 return;
269 }
270 }
271 #ifdef PWM_AUDIO
272 note_frequency = (*notes_pointer)[current_note][0] / SAMPLE_RATE;
273 note_length = (*notes_pointer)[current_note][1];
274 #else
275 note_frequency = (*notes_pointer)[current_note][0];
276 note_length = (*notes_pointer)[current_note][1] / 4;
277 #endif
278 note_position = 0;
279 }
280
281 }
282
283}
284
285void play_notes(float (*np)[][2], uint8_t n_length, bool n_repeat) {
286 if (note)
287 stop_all_notes();
288 notes = true;
289
290 notes_pointer = np;
291 notes_length = n_length;
292 notes_repeat = n_repeat;
293
294 place = 0;
295 current_note = 0;
296 #ifdef PWM_AUDIO
297 note_frequency = (*notes_pointer)[current_note][0] / SAMPLE_RATE;
298 note_length = (*notes_pointer)[current_note][1];
299 #else
300 note_frequency = (*notes_pointer)[current_note][0];
301 note_length = (*notes_pointer)[current_note][1] / 4;
302 #endif
303 note_position = 0;
304
305
306 #ifdef PWM_AUDIO
307 TIMSK3 |= _BV(OCIE3A);
308 #else
309 TIMSK3 |= _BV(OCIE3A);
310 TCCR3A |= _BV(COM3A1);
311 #endif
312}
313
314void play_sample(uint8_t * s, uint16_t l, bool r) {
315 stop_all_notes();
316 place_int = 0;
317 sample = s;
318 sample_length = l;
319 repeat = r;
320
321 #ifdef PWM_AUDIO
322 TIMSK3 |= _BV(OCIE3A);
323 #else
324 #endif
325}
326
327void play_note(double freq, int vol) {
328 if (notes)
329 stop_all_notes();
330 note = true;
331 #ifdef PWM_AUDIO
332 freq = freq / SAMPLE_RATE;
333 #endif
334 if (freq > 0) {
335 if (frequency != 0) {
336 double starting_f = frequency;
337 if (frequency < freq) {
338 for (double f = starting_f; f <= freq; f += ((freq - starting_f) / 2000.0)) {
339 frequency = f;
340 }
341 } else if (frequency > freq) {
342 for (double f = starting_f; f >= freq; f -= ((starting_f - freq) / 2000.0)) {
343 frequency = f;
344 }
345 }
346 }
347 frequency = freq;
348 volume = vol;
349
350 frequencies[voices] = frequency;
351 volumes[voices] = volume;
352 voices++;
353 }
354
355 #ifdef PWM_AUDIO
356 TIMSK3 |= _BV(OCIE3A);
357 #else
358 TIMSK3 |= _BV(OCIE3A);
359 TCCR3A |= _BV(COM3A1);
360 #endif
361
362} \ No newline at end of file
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