| 1 | #include <avr/io.h> |
| 2 | #include <avr/interrupt.h> |
| 3 | #include <inttypes.h> |
| 4 | #include <math.h> |
| 5 | |
| 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 |
| 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 */ |
| 38 | volatile int oticks = 0; |
| 39 | unsigned long mnow; |
| 40 | /* Pulse counter */ |
| 41 | volatile char pstate = 0; |
| 42 | char pval = 0; |
| 43 | /* Switch */ |
| 44 | volatile char sstate = 0; |
| 45 | int stime = 0; |
| 46 | /* Temp sensor */ |
| 47 | volatile char tstate = 0; |
| 48 | volatile char tlock = 0; |
| 49 | unsigned long tstart; |
| 50 | unsigned long ttime; |
| 51 | unsigned long ttimea = 10000; |
| 52 | char tavgok = 0; |
| 53 | /* Conversion loop */ |
| 54 | int tempk; |
| 55 | volatile ktok = 0; |
| 56 | /* Zero-cross detector*/ |
| 57 | volatile char zok = 0; |
| 58 | volatile char ztime = 0; |
| 59 | /* Triac */ |
| 60 | char trstate = 0; |
| 61 | char tron = 0; |
| 62 | volatile char trtime; |
| 63 | volatile char trdelay = 0; |
| 64 | |
| 65 | void init(void) |
| 66 | { |
| 67 | /* Timer init |
| 68 | * Timer 0 cycles the Triac |
| 69 | * Timer 1 is used for global timing |
| 70 | * Timer 2 cycles the LED display |
| 71 | */ |
| 72 | OCR0A = 100; |
| 73 | TCCR0A = 2; |
| 74 | TCCR0B = 1; |
| 75 | TIMSK0 = 2; |
| 76 | TCCR1A = 0; |
| 77 | TCCR1B = 1; |
| 78 | TIMSK1 = 1; |
| 79 | OCR2A = 16; |
| 80 | TCCR2A = 2; |
| 81 | TCCR2B = 4; |
| 82 | TIMSK2 = 2; |
| 83 | |
| 84 | /* |
| 85 | * B0..2 = Pulse sensor |
| 86 | * B3..5 = ISP |
| 87 | * B6..7 = CLK |
| 88 | */ |
| 89 | DDRB = 0x38; |
| 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 | /* |
| 151 | * This version is used outside interrupts. |
| 152 | * It spins until no overflow has happened. |
| 153 | */ |
| 154 | unsigned long getticks(void) |
| 155 | { |
| 156 | uint16_t v; |
| 157 | unsigned long r; |
| 158 | |
| 159 | do { |
| 160 | v = oticks; |
| 161 | r = TCNT1 + (((unsigned long)oticks) << 16); |
| 162 | } while(v != oticks); |
| 163 | return(r); |
| 164 | } |
| 165 | |
| 166 | /* |
| 167 | * This version is used in interrupts |
| 168 | */ |
| 169 | unsigned long getticks2(void) |
| 170 | { |
| 171 | uint16_t v; |
| 172 | unsigned long r; |
| 173 | |
| 174 | v = TCNT1; |
| 175 | r = v + (((unsigned long)oticks) << 16); |
| 176 | if((TIFR1 & 0x01) && !(v & 0x8000)) |
| 177 | return(r + 0x10000); |
| 178 | else |
| 179 | return(r); |
| 180 | } |
| 181 | |
| 182 | void ledcycle(void) |
| 183 | { |
| 184 | uint8_t c, d, v; |
| 185 | |
| 186 | if(++leda >= 8) { |
| 187 | leda = 0; |
| 188 | if(++ledc >= 2) |
| 189 | ledc = 0; |
| 190 | } |
| 191 | if(dsp[ledc] & (1 << leda)) { |
| 192 | if(leda < 6) { |
| 193 | c = 1 << leda; |
| 194 | d = 0; |
| 195 | } else { |
| 196 | c = 0; |
| 197 | d = 0x10 << (leda - 6); |
| 198 | } |
| 199 | d |= ledc?0x40:0x80; |
| 200 | } else { |
| 201 | c = d = 0; |
| 202 | } |
| 203 | PORTC = c; |
| 204 | PORTD = (PORTD & 0x0f) | d; |
| 205 | } |
| 206 | |
| 207 | void tempcycle(void) |
| 208 | { |
| 209 | if(tstate == 0) { |
| 210 | if((PIND & 8) && (tlock == 0)) { |
| 211 | cli(); |
| 212 | PORTD |= 2; |
| 213 | sei(); |
| 214 | tstart = mnow; |
| 215 | tstate = 1; |
| 216 | } |
| 217 | } else if(tstate == 1) { |
| 218 | if(mnow - tstart > 1000) { |
| 219 | cli(); |
| 220 | PORTD &= ~2; |
| 221 | sei(); |
| 222 | tstate = 0; |
| 223 | tstart = mnow; |
| 224 | } |
| 225 | } |
| 226 | } |
| 227 | |
| 228 | void calcavg(void) |
| 229 | { |
| 230 | if(tlock == 1) { |
| 231 | tlock = 2; |
| 232 | ttimea = ((ttimea * 15) + ttime) >> 4; |
| 233 | tlock = 0; |
| 234 | tavgok = 1; |
| 235 | } |
| 236 | } |
| 237 | |
| 238 | void convcycle(void) |
| 239 | { |
| 240 | static char state = 0; |
| 241 | static unsigned long last = 0; |
| 242 | static float a, ra, l, t; |
| 243 | |
| 244 | /* |
| 245 | * Theoretically: |
| 246 | * t = RC * ln(2) => R = t / (C * ln(2)) |
| 247 | * R = A * exp(B / T) => T = B / ln(R / A) |
| 248 | * T = B / ln(R / (A * C * ln(2))) |
| 249 | * In the following: |
| 250 | * a = ttimea as float |
| 251 | * C = 1e6 / (A * C * ln(2)) |
| 252 | * ra = a * C |
| 253 | * l = ln(ra) |
| 254 | * t = B / l |
| 255 | * Note, temperature is in Kelvin |
| 256 | */ |
| 257 | #define C 9.792934 |
| 258 | #define B 4020.0 |
| 259 | if(state == 0) { |
| 260 | if((mnow - last > 200000) && tavgok) { |
| 261 | a = (float)ttimea; |
| 262 | state = 1; |
| 263 | tavgok = 0; |
| 264 | last = mnow; |
| 265 | } |
| 266 | } else if(state == 1) { |
| 267 | ra = a * C; |
| 268 | state = 2; |
| 269 | } else if(state == 2) { |
| 270 | l = log(ra); |
| 271 | state = 3; |
| 272 | } else if(state == 3) { |
| 273 | t = B / l; |
| 274 | state = 4; |
| 275 | } else if(state == 4) { |
| 276 | tempk = (int)t; |
| 277 | ktok = 1; |
| 278 | state = 0; |
| 279 | } |
| 280 | } |
| 281 | |
| 282 | int main(void) |
| 283 | { |
| 284 | int state, cur, run; |
| 285 | unsigned long utime; |
| 286 | |
| 287 | state = 0; |
| 288 | cur = 100; |
| 289 | run = 0; |
| 290 | init(); |
| 291 | sei(); |
| 292 | display(0); |
| 293 | |
| 294 | while(1) { |
| 295 | mnow = getticks(); |
| 296 | tempcycle(); |
| 297 | calcavg(); |
| 298 | convcycle(); |
| 299 | |
| 300 | #if 1 |
| 301 | /* |
| 302 | * User interface |
| 303 | */ |
| 304 | if(state == 0) { |
| 305 | /* Display temperature */ |
| 306 | if(ktok) { |
| 307 | ktok = 0; |
| 308 | if((tempk >= 273) && (tempk <= 372)) { |
| 309 | display(tempk - 273); |
| 310 | } else { |
| 311 | dsp[0] = dsp[1] = SEGG; |
| 312 | } |
| 313 | } |
| 314 | if(pval != 0) |
| 315 | state = 1; |
| 316 | if(sstate == 2) { |
| 317 | sstate = 0; |
| 318 | if(stime > 10) |
| 319 | state = 2; |
| 320 | else |
| 321 | run = !run; |
| 322 | } |
| 323 | if(run) |
| 324 | dsp[1] |= SEGP; |
| 325 | else |
| 326 | dsp[1] &= ~SEGP; |
| 327 | } else if(state == 1) { |
| 328 | /* Temp setting */ |
| 329 | if(pval != 0) { |
| 330 | cur += pval; |
| 331 | pval = 0; |
| 332 | if(cur < 0) |
| 333 | cur = 0; |
| 334 | if(cur > 100) |
| 335 | cur = 100; |
| 336 | if(cur < 100) |
| 337 | display(cur); |
| 338 | else |
| 339 | dsp[0] = dsp[1] = SEGG; |
| 340 | utime = mnow; |
| 341 | } |
| 342 | if(mnow - utime > 1000000) |
| 343 | state = 0; |
| 344 | if(sstate == 2) { |
| 345 | run = !run; |
| 346 | sstate = 0; |
| 347 | } |
| 348 | } else if(state == 2) { |
| 349 | /* Display raw temp time reading */ |
| 350 | if(ttimea < 20000) { |
| 351 | display((ttimea / 100) % 100); |
| 352 | dsp[0] |= SEGP; |
| 353 | if(ttimea >= 10000) |
| 354 | dsp[1] |= SEGP; |
| 355 | } else { |
| 356 | display(ttimea / 1000); |
| 357 | } |
| 358 | if(sstate == 2) { |
| 359 | state = 0; |
| 360 | sstate = 0; |
| 361 | } |
| 362 | } |
| 363 | /* |
| 364 | * Set Triac to match temperature |
| 365 | */ |
| 366 | if(run) { |
| 367 | if(tempk - 273 < cur) { |
| 368 | tron = 1; |
| 369 | if(cur - (tempk - 273) > 5) { |
| 370 | /* For some reason, the Triac currently doesn't |
| 371 | * trigger on one of the AC half-cycles below 0.7 |
| 372 | * ms. */ |
| 373 | trdelay = 7; |
| 374 | } else if(cur - (tempk - 273) >= 3) { |
| 375 | trdelay = 20; |
| 376 | } else if(cur - (tempk - 273) >= 2) { |
| 377 | trdelay = 40; |
| 378 | } else { |
| 379 | trdelay = 70; |
| 380 | } |
| 381 | } else { |
| 382 | tron = 0; |
| 383 | } |
| 384 | } else { |
| 385 | tron = 0; |
| 386 | } |
| 387 | #endif |
| 388 | /* |
| 389 | dsp[0] = bindisp((ttimea & 0xff00) >> 8); |
| 390 | dsp[1] = bindisp(ttimea & 0x00ff); |
| 391 | */ |
| 392 | /* |
| 393 | disphex((ttimea & 0xff000) >> 12); |
| 394 | */ |
| 395 | #if 0 |
| 396 | /* |
| 397 | Temp display |
| 398 | */ |
| 399 | if(ttimea < 20000) { |
| 400 | display((ttimea / 100) % 100); |
| 401 | dsp[0] |= SEGP; |
| 402 | if(ttimea >= 10000) |
| 403 | dsp[1] |= SEGP; |
| 404 | } else { |
| 405 | display(ttimea / 1000); |
| 406 | } |
| 407 | #endif |
| 408 | #if 0 |
| 409 | /* |
| 410 | * ZVD debug |
| 411 | */ |
| 412 | if(zok) { |
| 413 | if(++cur > 99) |
| 414 | cur = 0; |
| 415 | display(cur); |
| 416 | zok = 0; |
| 417 | } |
| 418 | #endif |
| 419 | #if 0 |
| 420 | /* |
| 421 | Phony Triac control |
| 422 | */ |
| 423 | if(pval != 0) { |
| 424 | cur += pval; |
| 425 | if(cur < 0) |
| 426 | cur = 0; |
| 427 | if(cur > 99) |
| 428 | cur = 99; |
| 429 | display(cur); |
| 430 | trdelay = 99 - cur; |
| 431 | pval = 0; |
| 432 | } |
| 433 | if(sstate == 2) { |
| 434 | tron = !tron; |
| 435 | sstate = 0; |
| 436 | } |
| 437 | if(tron) |
| 438 | dsp[1] |= SEGP; |
| 439 | else |
| 440 | dsp[1] &= ~SEGP; |
| 441 | #endif |
| 442 | #if 0 |
| 443 | /* |
| 444 | Pulse counter display |
| 445 | */ |
| 446 | cur += pval; |
| 447 | pval = 0; |
| 448 | if(sstate == 2) { |
| 449 | cur = stime; |
| 450 | sstate = 0; |
| 451 | } |
| 452 | if(cur > 99) |
| 453 | cur = 99; |
| 454 | if(cur < -99) |
| 455 | cur = -99; |
| 456 | if(cur < 0) { |
| 457 | display(-cur); |
| 458 | dsp[0] |= SEGP; |
| 459 | } else { |
| 460 | display(cur); |
| 461 | } |
| 462 | if(PINB & 4) |
| 463 | dsp[1] |= SEGP; |
| 464 | #endif |
| 465 | } |
| 466 | } |
| 467 | |
| 468 | ISR(SIG_INTERRUPT0) |
| 469 | { |
| 470 | ztime = 0; |
| 471 | zok = 1; |
| 472 | } |
| 473 | |
| 474 | ISR(SIG_INTERRUPT1) |
| 475 | { |
| 476 | unsigned long now; |
| 477 | |
| 478 | now = getticks2(); |
| 479 | if(tstate == 0) { |
| 480 | tstate = 1; |
| 481 | if(tlock != 2) |
| 482 | ttime = now - tstart; |
| 483 | tstart = now; |
| 484 | PORTD |= 2; |
| 485 | tlock = 1; |
| 486 | } |
| 487 | } |
| 488 | |
| 489 | ISR(SIG_OUTPUT_COMPARE0A) |
| 490 | { |
| 491 | if(trstate == 0) { |
| 492 | ztime++; |
| 493 | if(tron && (ztime >= trdelay)) { |
| 494 | PORTD |= 1; |
| 495 | trstate = 1; |
| 496 | trtime = 0; |
| 497 | } |
| 498 | } else if(trstate == 1) { |
| 499 | trtime++; |
| 500 | if(trtime >= 5) { |
| 501 | PORTD &= ~1; |
| 502 | trstate = 0; |
| 503 | } |
| 504 | } |
| 505 | } |
| 506 | |
| 507 | ISR(SIG_OUTPUT_COMPARE2A) |
| 508 | { |
| 509 | ledcycle(); |
| 510 | } |
| 511 | |
| 512 | ISR(SIG_OVERFLOW1) |
| 513 | { |
| 514 | oticks++; |
| 515 | } |
| 516 | |
| 517 | ISR(SIG_PIN_CHANGE0) |
| 518 | { |
| 519 | if((sstate == 0) && !(PINB & 4)) { |
| 520 | stime = oticks; |
| 521 | sstate = 1; |
| 522 | } |
| 523 | if((sstate == 1) && (PINB & 4)) { |
| 524 | stime = oticks - stime; |
| 525 | sstate = 2; |
| 526 | } |
| 527 | if(pstate == 0) { |
| 528 | if((PINB & 2) == 0) { |
| 529 | pstate = 1; |
| 530 | } else if((PINB & 1) == 0) { |
| 531 | pstate = 2; |
| 532 | } |
| 533 | } else if(pstate == 1) { |
| 534 | if((PINB & 1) == 0) { |
| 535 | pval++; |
| 536 | pstate = 3; |
| 537 | } else { |
| 538 | pstate = 0; |
| 539 | } |
| 540 | } else if(pstate == 2) { |
| 541 | if((PINB & 2) == 0) { |
| 542 | pval--; |
| 543 | pstate = 3; |
| 544 | } else { |
| 545 | pstate = 0; |
| 546 | } |
| 547 | } else { |
| 548 | if((PINB & 2) && (PINB & 1)) |
| 549 | pstate = 0; |
| 550 | } |
| 551 | } |