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annotate 1wire.c @ 18:0876867347de
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| author | Daniel O'Connor <darius@dons.net.au> |
|---|---|
| date | Sat, 31 Jan 2015 23:26:21 +1030 |
| parents | d8002c716678 |
| children | b5e4591b6570 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 * Various 1 wire routines | |
| 3 * Search routine is copied from the Dallas owpd library with mods | |
| 4 * available from here http://www.ibutton.com/software/1wire/wirekit.html | |
| 5 * | |
| 6 * Copyright (c) 2004 | |
| 7 * Daniel O'Connor <darius@dons.net.au>. All rights reserved. | |
| 8 * | |
| 9 * Redistribution and use in source and binary forms, with or without | |
| 10 * modification, are permitted provided that the following conditions | |
| 11 * are met: | |
| 12 * 1. Redistributions of source code must retain the above copyright | |
| 13 * notice, this list of conditions and the following disclaimer. | |
| 14 * 2. Redistributions in binary form must reproduce the above copyright | |
| 15 * notice, this list of conditions and the following disclaimer in the | |
| 16 * documentation and/or other materials provided with the distribution. | |
| 17 * | |
| 18 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND | |
| 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 21 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE | |
| 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
| 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
| 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
| 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
| 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
| 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
| 28 * SUCH DAMAGE. | |
| 29 */ | |
| 30 | |
| 31 /* | |
| 32 * No user servicable parts inside | |
| 33 * | |
| 34 * Modify 1wire-config.h | |
| 35 */ | |
| 36 | |
| 37 #include <stdio.h> | |
|
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38 #include <stdint.h> |
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39 #include "1wire-config.h" |
| 0 | 40 #include "1wire.h" |
| 41 | |
| 42 static uint8_t OW_LastDevice = 0; | |
| 43 static uint8_t OW_LastDiscrepancy = 0; | |
| 44 static uint8_t OW_LastFamilyDiscrepancy = 0; | |
| 45 | |
| 46 const PROGMEM char *OWProgROM_Status[] = { | |
| 47 "OK", | |
| 48 "no HW support", | |
| 49 "Invalid params", | |
| 50 "module missing/broken" | |
| 51 }; | |
| 52 | |
| 53 /*----------------------------------------------------------------------------- | |
| 54 * Configure the IO port as we need | |
| 55 */ | |
| 56 void | |
| 57 OWInit(void) { | |
| 58 OWBUSINIT(); | |
| 59 OWSETBUSHIGH(); | |
| 60 } | |
| 61 | |
| 62 /*----------------------------------------------------------------------------- | |
| 63 * Generate a 1-Wire reset, return 0 if presence pulse was found, 1 if it | |
| 64 * wasn't, or 2 if the line appears to be being held low. | |
| 65 * | |
| 66 * (NOTE: Does not handle alarm presence from DS2404/DS1994) | |
| 67 */ | |
| 68 uint8_t | |
| 69 OWTouchReset(void) { | |
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70 uint8_t i; |
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71 |
| 0 | 72 OWDELAY_G; |
| 73 | |
| 74 /* Check the bus isn't being held low (ie it's broken) Do it after | |
| 75 * the delay so we guarantee we don't see a slave from a previous | |
| 76 * comms attempt | |
| 77 */ | |
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78 #if 1 |
| 0 | 79 OWSETREAD(); |
| 80 if(OWREADBUS() == 0) | |
| 81 return 2; | |
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82 #endif |
| 0 | 83 |
| 84 OWSETBUSLOW(); | |
| 85 OWDELAY_H; | |
| 86 OWSETBUSHIGH(); | |
| 87 OWDELAY_I; | |
| 88 | |
| 89 OWSETREAD(); | |
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90 i = OWREADBUS(); |
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91 |
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92 OWDELAY_J; |
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93 return(i); |
| 0 | 94 } |
| 95 | |
| 96 /*----------------------------------------------------------------------------- | |
| 97 * Send a 1-wire write bit. | |
| 98 */ | |
| 99 void | |
| 100 OWWriteBit(uint8_t bit) { | |
| 101 OWDELAY_I; | |
| 102 | |
| 103 if (bit) { | |
| 104 OWSETBUSLOW(); | |
| 105 OWDELAY_A; | |
| 106 OWSETBUSHIGH(); | |
| 107 OWDELAY_B; | |
| 108 } else { | |
| 109 OWSETBUSLOW(); | |
| 110 OWDELAY_C; | |
| 111 OWSETBUSHIGH(); | |
| 112 OWDELAY_D; | |
| 113 } | |
| 114 } | |
| 115 | |
| 116 /*----------------------------------------------------------------------------- | |
| 117 * Read a bit from the 1-wire bus and return it. | |
| 118 */ | |
| 119 uint8_t | |
| 120 OWReadBit(void) { | |
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121 uint8_t i; |
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122 |
| 0 | 123 OWDELAY_I; |
| 124 | |
| 125 OWSETBUSLOW(); | |
| 126 OWDELAY_A; | |
| 127 OWSETBUSHIGH(); | |
| 128 OWDELAY_E; | |
| 129 OWSETREAD(); | |
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130 i = OWREADBUS(); |
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131 OWDELAY_F; |
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132 return(i); |
| 0 | 133 } |
| 134 | |
| 135 /*----------------------------------------------------------------------------- | |
| 136 * Write a byte to the 1-wire bus | |
| 137 */ | |
| 138 void | |
| 139 OWWriteByte(uint8_t data) { | |
| 140 uint8_t i; | |
| 141 | |
| 142 /* Send LSB first */ | |
| 143 for (i = 0; i < 8; i++) { | |
| 144 OWWriteBit(data & 0x01); | |
| 145 data >>= 1; | |
| 146 } | |
| 147 } | |
| 148 | |
| 149 /*----------------------------------------------------------------------------- | |
| 150 * Read a byte from the 1-wire bus | |
| 151 */ | |
| 152 uint8_t | |
| 153 OWReadByte(void) { | |
| 154 int i, result = 0; | |
| 155 | |
| 156 for (i = 0; i < 8; i++) { | |
| 157 result >>= 1; | |
| 158 if (OWReadBit()) | |
| 159 result |= 0x80; | |
| 160 } | |
| 161 return(result); | |
| 162 } | |
| 163 | |
| 164 /*----------------------------------------------------------------------------- | |
| 165 * Write a 1-wire data byte and return the sampled result. | |
| 166 */ | |
| 167 uint8_t | |
| 168 OWTouchByte(uint8_t data) { | |
| 169 uint8_t i, result = 0; | |
| 170 | |
| 171 for (i = 0; i < 8; i++) { | |
| 172 result >>= 1; | |
| 173 | |
| 174 /* If sending a 1 then read a bit, otherwise write a 0 */ | |
| 175 if (data & 0x01) { | |
| 176 if (OWReadBit()) | |
| 177 result |= 0x80; | |
| 178 } else | |
| 179 OWWriteBit(0); | |
| 180 | |
| 181 data >>= 1; | |
| 182 } | |
| 183 | |
| 184 return(result); | |
| 185 } | |
| 186 | |
| 187 /*----------------------------------------------------------------------------- | |
| 188 * Write a block of bytes to the 1-wire bus and return the sampled result in | |
| 189 * the same buffer | |
| 190 */ | |
| 191 void | |
| 192 OWBlock(uint8_t *data, int len) { | |
| 193 int i; | |
| 194 | |
| 195 for (i = 0; i < len; i++) | |
| 196 data[i] = OWTouchByte(data[i]); | |
| 197 } | |
| 198 | |
| 199 | |
| 200 /*----------------------------------------------------------------------------- | |
| 201 * Send a 1 wire command to a device, or all if no ROM ID provided | |
| 202 */ | |
| 203 void | |
| 204 OWSendCmd(uint8_t *ROM, uint8_t cmd) { | |
| 205 uint8_t i; | |
| 206 | |
| 207 OWTouchReset(); | |
| 208 | |
| 209 if (ROM == NULL) | |
| 210 OWWriteByte(OW_SKIP_ROM_CMD); | |
| 211 else { | |
| 212 OWWriteByte(OW_MATCH_ROM_CMD); | |
| 213 for (i = 0; i < 8; i++) | |
| 214 OWWriteByte(ROM[i]); | |
| 215 } | |
| 216 OWWriteByte(cmd); | |
| 217 } | |
| 218 | |
| 219 /*----------------------------------------------------------------------------- | |
| 220 * Search algorithm from App note 187 (and 162) | |
| 221 * | |
| 222 * OWFirst/OWNext return.. | |
| 223 * 1 when something is found, | |
| 224 * 0 no more modules | |
| 225 * -1 if no presence pulse, | |
| 226 * -2 if bad CRC, | |
| 227 * -3 if bad wiring. | |
| 228 */ | |
| 229 uint8_t | |
| 230 OWFirst(uint8_t *ROM, uint8_t do_reset, uint8_t alarm_only) { | |
| 231 /* Reset state */ | |
| 232 OW_LastDiscrepancy = 0; | |
| 233 OW_LastDevice = 0; | |
| 234 OW_LastFamilyDiscrepancy = 0; | |
| 235 | |
| 236 /* Go looking */ | |
| 237 return (OWNext(ROM, do_reset, alarm_only)); | |
| 238 } | |
| 239 | |
| 240 /* Returns 1 when something is found, 0 if nothing left */ | |
| 241 uint8_t | |
| 242 OWNext(uint8_t *ROM, uint8_t do_reset, uint8_t alarm_only) { | |
| 243 uint8_t bit_test, search_direction, bit_number; | |
| 244 uint8_t last_zero, rom_byte_number, rom_byte_mask; | |
| 245 uint8_t lastcrc8, crcaccum; | |
| 246 int8_t next_result; | |
| 247 | |
| 248 /* Init for search */ | |
| 249 bit_number = 1; | |
| 250 last_zero = 0; | |
| 251 rom_byte_number = 0; | |
| 252 rom_byte_mask = 1; | |
| 253 next_result = OW_NOMODULES; | |
| 254 lastcrc8 = 0; | |
| 255 crcaccum = 0; | |
| 256 | |
| 257 /* if the last call was not the last one */ | |
| 258 if (!OW_LastDevice) { | |
| 259 /* check if reset first is requested */ | |
| 260 if (do_reset) { | |
| 261 /* reset the 1-wire | |
| 262 * if there are no parts on 1-wire, return 0 */ | |
| 263 OWPUTSP(PSTR("Resetting\r\n")); | |
| 264 switch (OWTouchReset()) { | |
| 265 case 0: | |
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266 OWPUTSP(PSTR("Found device(s)\r\n")); |
| 0 | 267 break; |
| 268 | |
| 269 case 1: | |
| 270 /* reset the search */ | |
| 271 OW_LastDiscrepancy = 0; | |
| 272 OW_LastFamilyDiscrepancy = 0; | |
| 273 OWPUTSP(PSTR("No devices on bus\r\n")); | |
| 274 return OW_NOPRESENCE; | |
| 275 break; | |
| 276 | |
| 277 case 2: | |
| 278 /* reset the search */ | |
| 279 OW_LastDiscrepancy = 0; | |
| 280 OW_LastFamilyDiscrepancy = 0; | |
| 281 OWPUTSP(PSTR("Bus appears to be being held low\r\n")); | |
| 282 return OW_BADWIRE; | |
| 283 break; | |
| 284 | |
| 285 } | |
| 286 } | |
| 287 | |
| 288 /* If finding alarming devices issue a different command */ | |
| 289 if (alarm_only) | |
| 290 OWWriteByte(OW_SEARCH_ALRM_CMD); /* issue the alarming search command */ | |
| 291 else | |
| 292 OWWriteByte(OW_SEARCH_ROM_CMD); /* issue the search command */ | |
| 293 | |
| 294 /* pause before beginning the search */ | |
| 295 OWDELAY_I; | |
| 296 OWDELAY_I; | |
| 297 OWDELAY_I; | |
| 298 | |
| 299 /* loop to do the search */ | |
| 300 do { | |
| 301 /* read a bit and its compliment */ | |
| 302 bit_test = OWReadBit() << 1; | |
| 303 bit_test |= OWReadBit(); | |
| 304 | |
| 305 OWPRINTFP(PSTR("bit_test = %d\r\n"), bit_test); | |
| 306 | |
| 307 /* check for no devices on 1-wire */ | |
| 308 if (bit_test == 3) { | |
| 309 OWPRINTFP(PSTR("bit_test = %d\r\n"), bit_test); | |
| 310 return(OW_BADWIRE); | |
| 311 } | |
| 312 else { | |
| 313 /* all devices coupled have 0 or 1 */ | |
| 314 if (bit_test > 0) | |
| 315 search_direction = !(bit_test & 0x01); /* bit write value for search */ | |
| 316 else { | |
| 317 /* if this discrepancy is before the Last Discrepancy | |
| 318 * on a previous OWNext then pick the same as last time */ | |
| 319 if (bit_number < OW_LastDiscrepancy) | |
| 320 search_direction = ((ROM[rom_byte_number] & rom_byte_mask) > 0); | |
| 321 else | |
| 322 /* if equal to last pick 1, if not then pick 0 */ | |
| 323 search_direction = (bit_number == OW_LastDiscrepancy); | |
| 324 | |
| 325 /* if 0 was picked then record its position in LastZero */ | |
| 326 if (search_direction == 0) { | |
| 327 last_zero = bit_number; | |
| 328 | |
| 329 /* check for Last discrepancy in family */ | |
| 330 if (last_zero < 9) | |
| 331 OW_LastFamilyDiscrepancy = last_zero; | |
| 332 } | |
| 333 } | |
| 334 | |
| 335 /* set or clear the bit in the ROM byte rom_byte_number | |
| 336 * with mask rom_byte_mask */ | |
| 337 if (search_direction == 1) | |
| 338 ROM[rom_byte_number] |= rom_byte_mask; | |
| 339 else | |
| 340 ROM[rom_byte_number] &= ~rom_byte_mask; | |
| 341 | |
| 342 /* serial number search direction write bit */ | |
| 343 OWWriteBit(search_direction); | |
| 344 | |
| 345 /* increment the byte counter bit_number | |
| 346 * and shift the mask rom_byte_mask */ | |
| 347 bit_number++; | |
| 348 rom_byte_mask <<= 1; | |
| 349 | |
| 350 /* if the mask is 0 then go to new ROM byte rom_byte_number | |
| 351 * and reset mask */ | |
| 352 if (rom_byte_mask == 0) { | |
| 353 OWCRC(ROM[rom_byte_number], &crcaccum); /* accumulate the CRC */ | |
| 354 lastcrc8 = crcaccum; | |
| 355 | |
| 356 rom_byte_number++; | |
| 357 rom_byte_mask = 1; | |
| 358 } | |
| 359 } | |
| 360 } while (rom_byte_number < 8); /* loop until through all ROM bytes 0-7 */ | |
| 361 | |
| 362 /* if the search was successful then */ | |
| 363 if (!(bit_number < 65) || lastcrc8) { | |
| 364 if (lastcrc8) { | |
| 365 OWPRINTFP(PSTR("Bad CRC (%d)\r\n"), lastcrc8); | |
| 366 next_result = OW_BADCRC; | |
| 367 } else { | |
| 368 /* search successful so set LastDiscrepancy,LastDevice,next_result */ | |
| 369 OW_LastDiscrepancy = last_zero; | |
| 370 OW_LastDevice = (OW_LastDiscrepancy == 0); | |
| 371 OWPRINTFP(PSTR("Last device = %d\r\n"), OW_LastDevice); | |
| 372 next_result = OW_FOUND; | |
| 373 } | |
| 374 } | |
| 375 } | |
| 376 | |
| 377 /* if no device found then reset counters so next 'next' will be | |
| 378 * like a first */ | |
| 379 if (next_result != OW_FOUND || ROM[0] == 0) { | |
| 380 OW_LastDiscrepancy = 0; | |
| 381 OW_LastDevice = 0; | |
| 382 OW_LastFamilyDiscrepancy = 0; | |
| 383 } | |
| 384 | |
| 385 if (next_result == OW_FOUND && ROM[0] == 0x00) | |
| 386 next_result = OW_BADWIRE; | |
| 387 | |
| 388 return next_result; | |
| 389 | |
| 390 } | |
| 391 | |
| 392 uint8_t PROGMEM dscrc_table[] = { | |
| 393 0, 94, 188, 226, 97, 63, 221, 131, 194, 156, 126, 32, 163, 253, 31, 65, | |
| 394 157, 195, 33, 127, 252, 162, 64, 30, 95, 1, 227, 189, 62, 96, 130, 220, | |
| 395 35, 125, 159, 193, 66, 28, 254, 160, 225, 191, 93, 3, 128, 222, 60, 98, | |
| 396 190, 224, 2, 92, 223, 129, 99, 61, 124, 34, 192, 158, 29, 67, 161, 255, | |
| 397 70, 24, 250, 164, 39, 121, 155, 197, 132, 218, 56, 102, 229, 187, 89, 7, | |
| 398 219, 133,103, 57, 186, 228, 6, 88, 25, 71, 165, 251, 120, 38, 196, 154, | |
| 399 101, 59, 217, 135, 4, 90, 184, 230, 167, 249, 27, 69, 198, 152, 122, 36, | |
| 400 248, 166, 68, 26, 153, 199, 37, 123, 58, 100, 134, 216, 91, 5, 231, 185, | |
| 401 140,210, 48, 110, 237, 179, 81, 15, 78, 16, 242, 172, 47, 113,147, 205, | |
| 402 17, 79, 173, 243, 112, 46, 204, 146, 211,141, 111, 49, 178, 236, 14, 80, | |
| 403 175, 241, 19, 77, 206, 144, 114, 44, 109, 51, 209, 143, 12, 82,176, 238, | |
| 404 50, 108, 142, 208, 83, 13, 239, 177, 240, 174, 76, 18, 145, 207, 45, 115, | |
| 405 202, 148, 118, 40, 171, 245, 23, 73, 8, 86, 180, 234, 105, 55, 213, 139, | |
| 406 87, 9, 235, 181, 54, 104, 138, 212, 149, 203, 41, 119, 244, 170, 72, 22, | |
| 407 233, 183, 85, 11, 136, 214, 52, 106, 43, 117, 151, 201, 74, 20, 246, 168, | |
| 408 116, 42, 200, 150, 21, 75, 169, 247, 182, 232, 10, 84, 215, 137, 107, 53 | |
| 409 }; | |
| 410 | |
| 411 /*----------------------------------------------------------------------------- | |
| 412 * Update *crc based on the value of x | |
| 413 */ | |
| 414 void | |
| 415 OWCRC(uint8_t x, uint8_t *crc) { | |
| 416 *crc = pgm_read_byte(&dscrc_table[(*crc) ^ x]); | |
| 417 } | |
| 418 | |
| 419 /*----------------------------------------------------------------------------- | |
| 420 * Program a DS2502's memory | |
| 421 * | |
| 422 * Arguments | |
| 423 * ROM - ROM ID (or NULL to send SKIP_ROM) | |
| 424 * start - Start address (bytes) | |
| 425 * len - Length of data to write | |
| 426 * data - Data to write | |
| 427 * exact - If true, only accept exact matches for programming, | |
| 428 * otherwise only ensure the bits we requested were | |
| 429 * programmed [to 0] | |
| 430 * status - If true program status rather than memory | |
| 431 * | |
| 432 * Returns.. | |
| 433 * 0 if all is OK | |
| 434 * 1 if the programming is not possible | |
| 435 * 2 if the parameters were invalid | |
| 436 * 3 if the DS2502 didn't respond appropriately (also happens if the | |
| 437 * module doesn't exist) | |
| 438 */ | |
|
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parents:
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439 #if defined(OWSETVPPON) && defined(OWSETVPPOFF) |
| 0 | 440 uint8_t |
| 441 OWProgROM(uint8_t *ROM, uint8_t start, uint8_t len, uint8_t *data, uint8_t exact, uint8_t status) { | |
| 442 uint8_t crc, i, tmp; | |
| 443 | |
| 444 /* Stupid programmer detection */ | |
| 445 if (status) { | |
| 446 if (start + len > 3) | |
| 447 return(2); | |
| 448 } else { | |
| 449 if (start + len > 127) | |
| 450 return(2); | |
| 451 } | |
| 452 | |
| 453 if (len < 1) | |
| 454 return(2); | |
| 455 | |
| 456 OWDELAY_I; | |
| 457 if (OWTouchReset() != 0) { | |
| 458 cons_putsP(PSTR("No presence pulse\r\n")); | |
| 459 return(3); | |
| 460 } | |
| 461 | |
| 462 crc = 0; | |
| 463 | |
| 464 /* Send the command */ | |
| 465 if (status) { | |
| 466 OWSendCmd(ROM, OW_WRITE_STATUS); | |
| 467 OWCRC(OW_WRITE_STATUS, &crc); | |
| 468 } else { | |
| 469 OWSendCmd(ROM, OW_WRITE_MEMORY); | |
| 470 OWCRC(OW_WRITE_MEMORY, &crc); | |
| 471 } | |
| 472 | |
| 473 /* And the start address | |
| 474 * (2 bytes even though one would do) | |
| 475 */ | |
| 476 OWWriteByte(start); | |
| 477 OWCRC(start, &crc); | |
| 478 | |
| 479 OWWriteByte(0x00); | |
| 480 OWCRC(0x00, &crc); | |
| 481 | |
| 482 for (i = 0; i < len; i++) { | |
| 483 cons_putsP(PSTR("Programming ")); | |
| 484 cons_puts_hex(data[i]); | |
| 485 cons_putsP(PSTR(" to ")); | |
| 486 cons_puts_hex(start + i); | |
| 487 cons_putsP(PSTR("\r\n")); | |
| 488 | |
| 489 OWWriteByte(data[i]); | |
| 490 OWCRC(data[i], &crc); | |
| 491 | |
| 492 tmp = OWReadByte(); | |
| 493 | |
| 494 if (crc != tmp) { | |
| 495 cons_putsP(PSTR("CRC mismatch ")); | |
| 496 cons_puts_hex(crc); | |
| 497 cons_putsP(PSTR(" vs ")); | |
| 498 cons_puts_hex(tmp); | |
| 499 cons_putsP(PSTR("\r\n")); | |
| 500 | |
| 501 OWTouchReset(); | |
| 502 return(3); | |
| 503 } | |
| 504 | |
| 505 OWSETVPPON(); | |
| 506 OWDELAY_H; | |
| 507 OWSETVPPOFF(); | |
| 508 | |
| 509 tmp = OWReadByte(); | |
| 510 | |
| 511 /* Check the bits we turned off are off */ | |
| 512 /* | |
| 513 for (i = 0; i < 8; i++) | |
| 514 if (!(data[i] & 1 << i) && (tmp & 1 << i)) | |
| 515 return(-3); | |
| 516 */ | |
| 517 if ((!data[i] & tmp) != 0) { | |
| 518 cons_putsP(PSTR("Readback mismatch ")); | |
| 519 cons_puts_hex(data[i]); | |
| 520 cons_putsP(PSTR(" vs ")); | |
| 521 cons_puts_hex(data[i]); | |
| 522 cons_putsP(PSTR("\r\n")); | |
| 523 | |
| 524 OWTouchReset(); | |
| 525 return(3); | |
| 526 } | |
| 527 | |
| 528 /* The DS2502 loads it's CRC register with the address of the | |
| 529 * next byte */ | |
| 530 crc = 0; | |
| 531 OWCRC(start + i + 1, &crc); | |
| 532 } | |
| 533 | |
| 534 return(0); | |
|
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535 } |
| 0 | 536 #else |
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537 uint8_t |
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- Rename 1wire config example to note it's for AVR.
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538 OWProgROM(uint8_t *ROM __attribute((unused)), uint8_t start __attribute((unused)), uint8_t len __attribute((unused)), uint8_t *data __attribute((unused)), uint8_t exact __attribute((unused)), uint8_t status __attribute((unused))) { |
| 0 | 539 return(1); |
|
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- Rename 1wire config example to note it's for AVR.
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540 } |
| 0 | 541 #endif |
| 542 | |
| 543 /* | |
| 544 * OWGetTemp | |
| 545 * | |
| 546 * Get the temperature from a 1wire bus module | |
| 547 * | |
| 548 * Returns temperature in hundredths of a degree or OW_TEMP_xxx on | |
| 549 * error. | |
| 550 */ | |
| 551 int16_t | |
| 552 OWGetTemp(uint8_t *ROM) { | |
| 553 int8_t i; | |
| 554 uint8_t crc, buf[9]; | |
| 555 int16_t temp; | |
| 556 int16_t tfrac; | |
| 557 | |
| 558 if (ROM[0] != OW_FAMILY_TEMP) | |
| 559 return OW_TEMP_WRONG_FAM; | |
| 560 | |
| 561 OWSendCmd(ROM, OW_CONVERTT_CMD); | |
| 562 | |
| 563 i = 0; | |
| 564 | |
| 565 /* Wait for the conversion */ | |
| 566 while (OWReadBit() == 0) | |
| 567 i = 1; | |
| 568 | |
| 569 /* Check that we talked to a module and it did something */ | |
| 570 if (i == 0) { | |
| 571 return OW_TEMP_NO_ROM; | |
| 572 } | |
| 573 | |
| 574 OWSendCmd(ROM, OW_RD_SCR_CMD); | |
| 575 crc = 0; | |
| 576 for (i = 0; i < 8; i++) { | |
| 577 buf[i] = OWReadByte(); | |
| 578 OWCRC(buf[i], &crc); | |
| 579 } | |
| 580 buf[i] = OWReadByte(); | |
| 581 if (crc != buf[8]) | |
| 582 return OW_TEMP_CRC_ERR; | |
| 583 temp = buf[0]; | |
| 584 if (buf[1] & 0x80) | |
| 585 temp -= 256; | |
| 586 | |
| 587 /* Chop off 0.5 degree bit */ | |
| 588 temp >>= 1; | |
| 589 | |
| 590 /* Calulate the fractional remainder */ | |
| 591 tfrac = buf[7] - buf[6]; | |
| 592 | |
| 593 /* Work in 100'th of degreess to save on floats */ | |
| 594 tfrac *= (int16_t)100; | |
| 595 | |
| 596 /* Divide by count */ | |
| 597 tfrac /= buf[7]; | |
| 598 | |
| 599 /* Subtract 0.25 deg from temp */ | |
| 600 tfrac += 75; | |
| 601 if (tfrac < 100) | |
| 602 temp--; | |
| 603 else | |
| 604 tfrac -= 100; | |
| 605 | |
| 606 i = temp; | |
| 607 temp *= 100; | |
| 608 temp += tfrac; | |
| 609 | |
| 610 return(temp); | |
| 611 } | |
| 612 | |
| 613 /* | |
| 614 * OWTempStatusStr | |
| 615 * | |
| 616 * Return a string for each OW_TEMP_xxx error code | |
| 617 * | |
| 618 * shrt = 1 returns short strings | |
| 619 * | |
| 620 */ | |
| 621 const char * | |
| 622 OWTempStatusStr(int16_t val, uint8_t shrt) { | |
| 623 if (val > OW_TEMP_BADVAL) { | |
| 624 if (shrt) | |
| 625 return PSTR("OK"); | |
| 626 else | |
| 627 return PSTR("OK"); | |
| 628 } | |
| 629 | |
| 630 switch (val) { | |
| 631 case OW_TEMP_WRONG_FAM: | |
| 632 if (shrt) | |
| 633 return PSTR("WrFam"); | |
| 634 else | |
| 635 return PSTR("Wrong family"); | |
| 636 break; | |
| 637 case OW_TEMP_CRC_ERR: | |
| 638 if (shrt) | |
| 639 return PSTR("CRCErr"); | |
| 640 else | |
| 641 return PSTR("CRC Error"); | |
| 642 break; | |
| 643 case OW_TEMP_NO_ROM: | |
| 644 if (shrt) | |
| 645 return PSTR("NoROM"); | |
| 646 else | |
| 647 return PSTR("ROM did not reply"); | |
| 648 break; | |
| 649 default: | |
| 650 if (shrt) | |
| 651 return PSTR("???"); | |
| 652 else | |
| 653 return PSTR("Unknown error code"); | |
| 654 break; | |
| 655 } | |
| 656 } |