Commit | Line | Data |
---|---|---|
31415646 FT |
1 | #include <avr/io.h> |
2 | #include <avr/interrupt.h> | |
3 | #include <inttypes.h> | |
2f37b902 | 4 | #include <math.h> |
31415646 | 5 | |
2378926d FT |
6 | #define SEGA 4 |
7 | #define SEGB 2 | |
8 | #define SEGC 1 | |
9 | #define SEGD 32 | |
10 | #define SEGE 64 | |
11 | #define SEGF 16 | |
12 | #define SEGG 8 | |
13 | #define SEGP 128 | |
31415646 FT |
14 | |
15 | uint8_t font[16] = { | |
16 | SEGA | SEGB | SEGC | SEGD | SEGE | SEGF, | |
17 | SEGB | SEGC, | |
18 | SEGA | SEGB | SEGD | SEGE | SEGG, | |
19 | SEGA | SEGB | SEGC | SEGD | SEGG, | |
20 | SEGB | SEGC | SEGF | SEGG, | |
21 | SEGA | SEGC | SEGD | SEGF | SEGG, | |
22 | SEGA | SEGC | SEGD | SEGE | SEGF | SEGG, | |
23 | SEGA | SEGB | SEGC, | |
24 | SEGA | SEGB | SEGC | SEGD | SEGE | SEGF | SEGG, | |
25 | SEGA | SEGB | SEGC | SEGD | SEGF | SEGG, | |
26 | SEGA | SEGB | SEGC | SEGE | SEGF | SEGG, | |
27 | SEGC | SEGD | SEGE | SEGF | SEGG, | |
28 | SEGA | SEGD | SEGE | SEGF, | |
29 | SEGB | SEGC | SEGD | SEGE | SEGG, | |
30 | SEGA | SEGD | SEGE | SEGF | SEGG, | |
31 | SEGA | SEGE | SEGF | SEGG, | |
32 | }; | |
33 | /* LED */ | |
34 | uint8_t dsp[2] = {0, 0}; | |
35 | char leda = 0; | |
36 | char ledc = 0; | |
37 | /* Timer */ | |
26e5097c | 38 | volatile int oticks = 0; |
59d1e985 | 39 | unsigned long mnow; |
31415646 | 40 | /* Pulse counter */ |
26e5097c | 41 | volatile char pstate = 0; |
31415646 FT |
42 | char pval = 0; |
43 | /* Switch */ | |
26e5097c | 44 | volatile char sstate = 0; |
31415646 FT |
45 | int stime = 0; |
46 | /* Temp sensor */ | |
26e5097c FT |
47 | volatile char tstate = 0; |
48 | volatile char tlock = 0; | |
31415646 FT |
49 | unsigned long tstart; |
50 | unsigned long ttime; | |
51 | unsigned long ttimea = 10000; | |
c1346a55 | 52 | char tavgok = 0; |
2f37b902 FT |
53 | /* Conversion loop */ |
54 | int tempk; | |
55 | volatile ktok = 0; | |
31415646 | 56 | /* Zero-cross detector*/ |
26e5097c | 57 | volatile char zok = 0; |
c7732766 | 58 | volatile char ztime = 0; |
31415646 | 59 | /* Triac */ |
59d1e985 FT |
60 | char trstate = 0; |
61 | char tron = 0; | |
c7732766 FT |
62 | volatile char trtime; |
63 | volatile char trdelay = 0; | |
31415646 FT |
64 | |
65 | void init(void) | |
66 | { | |
c7732766 | 67 | /* Timer init |
8c536798 | 68 | * Timer 0 cycles the Triac |
c7732766 | 69 | * Timer 1 is used for global timing |
8c536798 | 70 | * Timer 2 cycles the LED display |
c7732766 FT |
71 | */ |
72 | OCR0A = 100; | |
73 | TCCR0A = 2; | |
74 | TCCR0B = 1; | |
75 | TIMSK0 = 2; | |
31415646 FT |
76 | TCCR1A = 0; |
77 | TCCR1B = 1; | |
78 | TIMSK1 = 1; | |
8c536798 FT |
79 | OCR2A = 16; |
80 | TCCR2A = 2; | |
81 | TCCR2B = 4; | |
82 | TIMSK2 = 2; | |
31415646 FT |
83 | |
84 | /* | |
85 | * B0..2 = Pulse sensor | |
86 | * B3..5 = ISP | |
87 | * B6..7 = CLK | |
88 | */ | |
c1346a55 | 89 | DDRB = 0x38; |
31415646 FT |
90 | PORTB = 0x07; |
91 | PCMSK0 = 0x07; | |
92 | PCICR = 0x01; | |
93 | /* | |
94 | * C0..5 = LEDA0..5 | |
95 | * C6 = /RESET | |
96 | * C7 = NC | |
97 | */ | |
98 | DDRC = 0x3f; | |
99 | PORTC = 0x00; | |
100 | /* | |
101 | * D0 = Triac | |
102 | * D1 = NTC FET | |
103 | * D2 = ZCD (INT0) | |
104 | * D3 = NTC Op-amp (INT1) | |
105 | * D4..5 = LEDA6..7 | |
106 | * D6..7 = LEDC0..1 | |
107 | */ | |
108 | DDRD = 0xf3; | |
109 | PORTD = 0x00; | |
110 | EICRA = 0x0d; | |
111 | EIMSK = 0x03; | |
112 | } | |
113 | ||
114 | unsigned char bindisp(unsigned char num) | |
115 | { | |
116 | unsigned char ret; | |
117 | ||
118 | ret = 0; | |
119 | if(num & 1) | |
120 | ret |= SEGA; | |
121 | if(num & 2) | |
122 | ret |= SEGB; | |
123 | if(num & 4) | |
124 | ret |= SEGC; | |
125 | if(num & 8) | |
126 | ret |= SEGD; | |
127 | if(num & 16) | |
128 | ret |= SEGE; | |
129 | if(num & 32) | |
130 | ret |= SEGF; | |
131 | if(num & 64) | |
132 | ret |= SEGG; | |
133 | if(num & 128) | |
134 | ret |= SEGP; | |
135 | return(ret); | |
136 | } | |
137 | ||
138 | void display(char num) | |
139 | { | |
140 | dsp[0] = font[(num / 10) % 10]; | |
141 | dsp[1] = font[num % 10]; | |
142 | } | |
143 | ||
144 | void disphex(unsigned char num) | |
145 | { | |
146 | dsp[0] = font[(num & 0xf0) >> 4]; | |
147 | dsp[1] = font[num & 0x0f]; | |
148 | } | |
149 | ||
150 | unsigned long getticks(void) | |
151 | { | |
152 | return(TCNT1 + (((unsigned long)oticks) << 16)); | |
153 | } | |
154 | ||
155 | void ledcycle(void) | |
156 | { | |
31415646 FT |
157 | uint8_t c, d, v; |
158 | ||
8c536798 FT |
159 | if(++leda >= 8) { |
160 | leda = 0; | |
161 | if(++ledc >= 2) | |
162 | ledc = 0; | |
163 | } | |
164 | if(dsp[ledc] & (1 << leda)) { | |
165 | if(leda < 6) { | |
166 | c = 1 << leda; | |
167 | d = 0; | |
31415646 | 168 | } else { |
8c536798 FT |
169 | c = 0; |
170 | d = 0x10 << (leda - 6); | |
31415646 | 171 | } |
8c536798 FT |
172 | d |= ledc?0x40:0x80; |
173 | } else { | |
174 | c = d = 0; | |
31415646 | 175 | } |
8c536798 FT |
176 | PORTC = c; |
177 | PORTD = (PORTD & 0x0f) | d; | |
31415646 FT |
178 | } |
179 | ||
180 | void tempcycle(void) | |
181 | { | |
31415646 FT |
182 | if(tstate == 0) { |
183 | if((PIND & 8) && (tlock == 0)) { | |
c7732766 | 184 | cli(); |
31415646 | 185 | PORTD |= 2; |
c7732766 | 186 | sei(); |
59d1e985 | 187 | tstart = mnow; |
31415646 FT |
188 | tstate = 1; |
189 | } | |
190 | } else if(tstate == 1) { | |
59d1e985 | 191 | if(mnow - tstart > 1000) { |
c7732766 | 192 | cli(); |
31415646 | 193 | PORTD &= ~2; |
c7732766 | 194 | sei(); |
31415646 | 195 | tstate = 0; |
59d1e985 | 196 | tstart = mnow; |
31415646 FT |
197 | } |
198 | } | |
199 | } | |
200 | ||
201 | void calcavg(void) | |
202 | { | |
203 | if(tlock == 1) { | |
204 | tlock = 2; | |
205 | ttimea = ((ttimea * 15) + ttime) >> 4; | |
206 | tlock = 0; | |
c1346a55 | 207 | tavgok = 1; |
31415646 FT |
208 | } |
209 | } | |
210 | ||
2f37b902 FT |
211 | void convcycle(void) |
212 | { | |
213 | static char state = 0; | |
214 | static unsigned long last = 0; | |
215 | static float a, ra, l, t; | |
216 | ||
217 | /* | |
218 | * Theoretically: | |
219 | * t = RC * ln(2) => R = t / (C * ln(2)) | |
220 | * R = A * exp(B / T) => T = B / ln(R / A) | |
221 | * T = B / ln(R / (A * C * ln(2))) | |
222 | * In the following: | |
223 | * a = ttimea as float | |
224 | * C = 1e6 / (A * C * ln(2)) | |
225 | * ra = a * C | |
226 | * l = ln(ra) | |
227 | * t = B / l | |
228 | * Note, temperature is in Kelvin | |
229 | */ | |
230 | #define C 9.792934 | |
231 | #define B 4020.0 | |
232 | if(state == 0) { | |
233 | if((mnow - last > 200000) && tavgok) { | |
234 | a = (float)ttimea; | |
235 | state = 1; | |
236 | tavgok = 0; | |
9ac074a9 | 237 | last = mnow; |
2f37b902 FT |
238 | } |
239 | } else if(state == 1) { | |
240 | ra = a * C; | |
241 | state = 2; | |
242 | } else if(state == 2) { | |
243 | l = log(ra); | |
244 | state = 3; | |
245 | } else if(state == 3) { | |
246 | t = B / l; | |
247 | state = 4; | |
248 | } else if(state == 4) { | |
249 | tempk = (int)t; | |
250 | ktok = 1; | |
251 | state = 0; | |
252 | } | |
253 | } | |
254 | ||
31415646 FT |
255 | int main(void) |
256 | { | |
174dfeb5 | 257 | int state, cur, run; |
c1346a55 | 258 | unsigned long utime; |
31415646 | 259 | |
c1346a55 | 260 | state = 0; |
174dfeb5 FT |
261 | cur = 100; |
262 | run = 0; | |
31415646 FT |
263 | init(); |
264 | sei(); | |
265 | display(0); | |
59d1e985 | 266 | |
31415646 | 267 | while(1) { |
59d1e985 | 268 | mnow = getticks(); |
31415646 FT |
269 | tempcycle(); |
270 | calcavg(); | |
2f37b902 | 271 | convcycle(); |
31415646 | 272 | |
63e3aac7 | 273 | #if 1 |
c1346a55 FT |
274 | /* |
275 | * User interface | |
276 | */ | |
277 | if(state == 0) { | |
278 | /* Display temperature */ | |
2f37b902 FT |
279 | if(ktok) { |
280 | ktok = 0; | |
281 | if((tempk >= 273) && (tempk <= 372)) { | |
282 | display(tempk - 273); | |
c1346a55 | 283 | } else { |
2f37b902 | 284 | dsp[0] = dsp[1] = SEGG; |
c1346a55 FT |
285 | } |
286 | } | |
174dfeb5 | 287 | if(pval != 0) |
c1346a55 | 288 | state = 1; |
2f37b902 FT |
289 | if(sstate == 2) { |
290 | sstate = 0; | |
174dfeb5 | 291 | if(stime > 10) |
2f37b902 | 292 | state = 2; |
174dfeb5 FT |
293 | else |
294 | run = !run; | |
2f37b902 | 295 | } |
174dfeb5 FT |
296 | if(run) |
297 | dsp[1] |= SEGP; | |
298 | else | |
299 | dsp[1] &= ~SEGP; | |
c1346a55 | 300 | } else if(state == 1) { |
174dfeb5 | 301 | /* Temp setting */ |
c1346a55 FT |
302 | if(pval != 0) { |
303 | cur += pval; | |
304 | pval = 0; | |
305 | if(cur < 0) | |
306 | cur = 0; | |
174dfeb5 FT |
307 | if(cur > 100) |
308 | cur = 100; | |
309 | if(cur < 100) | |
310 | display(cur); | |
311 | else | |
312 | dsp[0] = dsp[1] = SEGG; | |
c1346a55 FT |
313 | utime = mnow; |
314 | } | |
174dfeb5 | 315 | if(mnow - utime > 1000000) |
c1346a55 | 316 | state = 0; |
2f37b902 | 317 | if(sstate == 2) { |
174dfeb5 | 318 | run = !run; |
2f37b902 FT |
319 | sstate = 0; |
320 | } | |
321 | } else if(state == 2) { | |
174dfeb5 | 322 | /* Display raw temp time reading */ |
2f37b902 FT |
323 | if(ttimea < 20000) { |
324 | display((ttimea / 100) % 100); | |
325 | dsp[0] |= SEGP; | |
326 | if(ttimea >= 10000) | |
327 | dsp[1] |= SEGP; | |
328 | } else { | |
329 | display(ttimea / 1000); | |
330 | } | |
331 | if(sstate == 2) { | |
332 | state = 0; | |
333 | sstate = 0; | |
334 | } | |
c1346a55 | 335 | } |
174dfeb5 FT |
336 | /* |
337 | * Set Triac to match temperature | |
338 | */ | |
339 | if(run) { | |
340 | if(tempk - 273 < cur) { | |
341 | tron = 1; | |
342 | if(cur - (tempk - 273) > 5) { | |
343 | /* For some reason, the Triac currently doesn't | |
344 | * trigger on one of the AC half-cycles below 0.7 | |
345 | * ms. */ | |
346 | trdelay = 7; | |
347 | } else if(cur - (tempk - 273) >= 3) { | |
348 | trdelay = 20; | |
349 | } else if(cur - (tempk - 273) >= 2) { | |
350 | trdelay = 40; | |
351 | } else { | |
352 | trdelay = 70; | |
353 | } | |
354 | } else { | |
355 | tron = 0; | |
356 | } | |
357 | } else { | |
358 | tron = 0; | |
359 | } | |
c1346a55 | 360 | #endif |
31415646 FT |
361 | /* |
362 | dsp[0] = bindisp((ttimea & 0xff00) >> 8); | |
363 | dsp[1] = bindisp(ttimea & 0x00ff); | |
364 | */ | |
365 | /* | |
366 | disphex((ttimea & 0xff000) >> 12); | |
367 | */ | |
495bea06 | 368 | #if 0 |
59d1e985 FT |
369 | /* |
370 | Temp display | |
371 | */ | |
31415646 FT |
372 | if(ttimea < 20000) { |
373 | display((ttimea / 100) % 100); | |
374 | dsp[0] |= SEGP; | |
375 | if(ttimea >= 10000) | |
376 | dsp[1] |= SEGP; | |
377 | } else { | |
378 | display(ttimea / 1000); | |
379 | } | |
59d1e985 | 380 | #endif |
2378926d | 381 | #if 0 |
72ef9ac1 FT |
382 | /* |
383 | * ZVD debug | |
384 | */ | |
385 | if(zok) { | |
386 | if(++cur > 99) | |
387 | cur = 0; | |
388 | display(cur); | |
389 | zok = 0; | |
390 | } | |
63e3aac7 | 391 | #endif |
c1346a55 | 392 | #if 0 |
495bea06 FT |
393 | /* |
394 | Phony Triac control | |
395 | */ | |
396 | if(pval != 0) { | |
397 | cur += pval; | |
398 | if(cur < 0) | |
399 | cur = 0; | |
400 | if(cur > 99) | |
401 | cur = 99; | |
402 | display(cur); | |
c7732766 | 403 | trdelay = 99 - cur; |
495bea06 FT |
404 | pval = 0; |
405 | } | |
406 | if(sstate == 2) { | |
407 | tron = !tron; | |
408 | sstate = 0; | |
409 | } | |
4f42f213 FT |
410 | if(tron) |
411 | dsp[1] |= SEGP; | |
412 | else | |
413 | dsp[1] &= ~SEGP; | |
495bea06 | 414 | #endif |
59d1e985 | 415 | #if 0 |
31415646 | 416 | /* |
59d1e985 FT |
417 | Pulse counter display |
418 | */ | |
31415646 FT |
419 | cur += pval; |
420 | pval = 0; | |
421 | if(sstate == 2) { | |
422 | cur = stime; | |
423 | sstate = 0; | |
424 | } | |
425 | if(cur > 99) | |
426 | cur = 99; | |
427 | if(cur < -99) | |
428 | cur = -99; | |
429 | if(cur < 0) { | |
430 | display(-cur); | |
431 | dsp[0] |= SEGP; | |
432 | } else { | |
433 | display(cur); | |
434 | } | |
4f42f213 FT |
435 | if(PINB & 4) |
436 | dsp[1] |= SEGP; | |
59d1e985 | 437 | #endif |
31415646 FT |
438 | } |
439 | } | |
440 | ||
441 | ISR(SIG_INTERRUPT0) | |
442 | { | |
c7732766 | 443 | ztime = 0; |
59d1e985 | 444 | zok = 1; |
31415646 FT |
445 | } |
446 | ||
447 | ISR(SIG_INTERRUPT1) | |
448 | { | |
449 | unsigned long now; | |
450 | ||
451 | now = getticks(); | |
452 | if(tstate == 0) { | |
453 | tstate = 1; | |
454 | if(tlock != 2) | |
455 | ttime = now - tstart; | |
456 | tstart = now; | |
457 | PORTD |= 2; | |
458 | tlock = 1; | |
459 | } | |
460 | } | |
461 | ||
c7732766 FT |
462 | ISR(SIG_OUTPUT_COMPARE0A) |
463 | { | |
464 | if(trstate == 0) { | |
465 | ztime++; | |
466 | if(tron && (ztime >= trdelay)) { | |
467 | PORTD |= 1; | |
468 | trstate = 1; | |
469 | trtime = 0; | |
470 | } | |
471 | } else if(trstate == 1) { | |
472 | trtime++; | |
473 | if(trtime >= 5) { | |
474 | PORTD &= ~1; | |
475 | trstate = 0; | |
476 | } | |
477 | } | |
478 | } | |
479 | ||
8c536798 FT |
480 | ISR(SIG_OUTPUT_COMPARE2A) |
481 | { | |
482 | ledcycle(); | |
483 | } | |
484 | ||
31415646 FT |
485 | ISR(SIG_OVERFLOW1) |
486 | { | |
31415646 FT |
487 | oticks++; |
488 | } | |
489 | ||
490 | ISR(SIG_PIN_CHANGE0) | |
491 | { | |
4f42f213 | 492 | if((sstate == 0) && !(PINB & 4)) { |
31415646 FT |
493 | stime = oticks; |
494 | sstate = 1; | |
495 | } | |
4f42f213 | 496 | if((sstate == 1) && (PINB & 4)) { |
31415646 FT |
497 | stime = oticks - stime; |
498 | sstate = 2; | |
499 | } | |
500 | if(pstate == 0) { | |
501 | if((PINB & 2) == 0) { | |
502 | pstate = 1; | |
2378926d | 503 | } else if((PINB & 1) == 0) { |
31415646 FT |
504 | pstate = 2; |
505 | } | |
506 | } else if(pstate == 1) { | |
2378926d | 507 | if((PINB & 1) == 0) { |
31415646 FT |
508 | pval++; |
509 | pstate = 3; | |
510 | } else { | |
511 | pstate = 0; | |
512 | } | |
513 | } else if(pstate == 2) { | |
514 | if((PINB & 2) == 0) { | |
515 | pval--; | |
516 | pstate = 3; | |
517 | } else { | |
518 | pstate = 0; | |
519 | } | |
520 | } else { | |
2378926d | 521 | if((PINB & 2) && (PINB & 1)) |
31415646 FT |
522 | pstate = 0; |
523 | } | |
524 | } |