Mercurial > ~darius > hgwebdir.cgi > tempctrl
annotate 1wire.c @ 22:bd792ebf813d
Report the bus being held low back to the caller from OWFirst/Next.
| author | darius |
|---|---|
| date | Mon, 12 Dec 2005 23:27:40 +1030 |
| parents | e82d15fa9a1a |
| children | 02b67e09ca12 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 * Various 1 wire routines | |
| 12 | 3 * Search routine is copied from the Dallas owpd library with mods |
| 4 * available from here http://www.ibutton.com/software/1wire/wirekit.html | |
| 0 | 5 * |
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6 * $Id$ |
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7 * |
| 0 | 8 * Copyright (c) 2004 |
| 9 * Daniel O'Connor <darius@dons.net.au>. All rights reserved. | |
| 10 * | |
| 11 * Redistribution and use in source and binary forms, with or without | |
| 12 * modification, are permitted provided that the following conditions | |
| 13 * are met: | |
| 14 * 1. Redistributions of source code must retain the above copyright | |
| 15 * notice, this list of conditions and the following disclaimer. | |
| 16 * 2. Redistributions in binary form must reproduce the above copyright | |
| 17 * notice, this list of conditions and the following disclaimer in the | |
| 18 * documentation and/or other materials provided with the distribution. | |
| 19 * | |
| 20 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND | |
| 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 23 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE | |
| 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
| 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
| 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
| 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
| 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
| 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
| 30 * SUCH DAMAGE. | |
| 31 */ | |
| 32 | |
| 33 #include <stdio.h> | |
| 34 #include <avr/io.h> | |
| 35 #include <avr/pgmspace.h> | |
| 21 | 36 #include <util/delay.h> |
| 0 | 37 #include "1wire.h" |
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38 #include "1wire-delay.h" |
| 0 | 39 |
| 12 | 40 #if OW_DEBUG |
| 0 | 41 void uart_putsP(const char *addr); |
| 42 void uart_puts(const char *addr); | |
| 43 void uart_getc(); | |
| 21 | 44 char uart_putc(char c); |
| 12 | 45 #endif |
| 0 | 46 |
| 47 static uint8_t OW_LastDevice = 0; | |
| 48 static uint8_t OW_LastDiscrepancy = 0; | |
| 49 static uint8_t OW_LastFamilyDiscrepancy = 0; | |
| 50 | |
| 51 static void | |
| 52 OWdelay(void) { | |
| 10 | 53 DELAY_I; |
| 0 | 54 } |
| 55 | |
| 56 /*----------------------------------------------------------------------------- | |
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57 * Generate a 1-Wire reset, return 0 if presence pulse was found, 1 if it |
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58 * wasn't, or 2 if the line appears to be being held low. |
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59 * |
| 21 | 60 * |
| 0 | 61 * (NOTE: Does not handle alarm presence from DS2404/DS1994) |
| 62 */ | |
| 12 | 63 uint8_t |
| 0 | 64 OWTouchReset(void) { |
| 10 | 65 DELAY_G; |
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66 |
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67 if (!(OWIREINPORT & _BV(OWIREINPIN))) |
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68 return 2; |
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69 |
| 10 | 70 OWIREOUTPORT &= ~(_BV(OWIREOUTPIN)); |
| 71 OWIREDDR |= _BV(OWIREOUTPIN); | |
| 72 DELAY_H; | |
| 73 OWIREDDR &= ~(_BV(OWIREOUTPIN)); | |
| 74 DELAY_I; | |
| 0 | 75 |
| 10 | 76 return(OWIREINPORT & _BV(OWIREINPIN) ? 1 : 0); |
| 0 | 77 } |
| 78 | |
| 79 /*----------------------------------------------------------------------------- | |
| 80 * Send a 1-wire write bit. | |
| 81 */ | |
| 82 void | |
| 12 | 83 OWWriteBit(uint8_t bit) { |
| 0 | 84 OWdelay(); |
| 85 if (bit) { | |
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86 OWIREOUTPORT &= ~(_BV(OWIREOUTPIN)); |
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87 OWIREDDR |= _BV(OWIREOUTPIN); |
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88 DELAY_A; |
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89 OWIREDDR &= ~(_BV(OWIREOUTPIN)); |
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90 DELAY_B; |
| 0 | 91 } else { |
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92 OWIREOUTPORT &= ~(_BV(OWIREOUTPIN)); |
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93 OWIREDDR |= _BV(OWIREOUTPIN); |
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94 DELAY_C; |
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95 OWIREDDR &= ~(_BV(OWIREOUTPIN)); |
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96 DELAY_D; |
| 0 | 97 } |
| 98 } | |
| 99 | |
| 100 /*----------------------------------------------------------------------------- | |
| 101 * Read a bit from the 1-wire bus and return it. | |
| 102 */ | |
| 12 | 103 uint8_t |
| 0 | 104 OWReadBit(void) { |
| 105 OWdelay(); | |
| 106 | |
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107 OWIREOUTPORT &= ~(_BV(OWIREOUTPIN)); |
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108 OWIREDDR |= _BV(OWIREOUTPIN); |
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109 DELAY_A; |
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110 OWIREDDR &= ~(_BV(OWIREOUTPIN)); |
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111 DELAY_E; |
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112 return(OWIREINPORT & _BV(OWIREINPIN) ? 1 : 0); |
| 0 | 113 } |
| 114 | |
| 115 /*----------------------------------------------------------------------------- | |
| 116 * Write a byte to the 1-wire bus | |
| 117 */ | |
| 118 void | |
| 119 OWWriteByte(uint8_t data) { | |
| 12 | 120 uint8_t i; |
| 0 | 121 |
| 122 /* Send LSB first */ | |
| 123 for (i = 0; i < 8; i++) { | |
| 124 OWWriteBit(data & 0x01); | |
| 125 data >>= 1; | |
| 126 } | |
| 127 } | |
| 128 | |
| 129 /*----------------------------------------------------------------------------- | |
| 130 * Read a byte from the 1-wire bus | |
| 131 */ | |
| 12 | 132 uint8_t |
| 0 | 133 OWReadByte(void) { |
| 134 int i, result = 0; | |
| 135 | |
| 136 for (i = 0; i < 8; i++) { | |
| 137 result >>= 1; | |
| 138 if (OWReadBit()) | |
| 139 result |= 0x80; | |
| 140 } | |
| 141 return(result); | |
| 142 } | |
| 143 | |
| 144 /*----------------------------------------------------------------------------- | |
| 145 * Write a 1-wire data byte and return the sampled result. | |
| 146 */ | |
| 12 | 147 uint8_t |
| 0 | 148 OWTouchByte(uint8_t data) { |
| 12 | 149 uint8_t i, result = 0; |
| 0 | 150 |
| 151 for (i = 0; i < 8; i++) { | |
| 152 result >>= 1; | |
| 153 | |
| 154 /* If sending a 1 then read a bit, otherwise write a 0 */ | |
| 155 if (data & 0x01) { | |
| 156 if (OWReadBit()) | |
| 157 result |= 0x80; | |
| 158 } else | |
| 159 OWWriteBit(0); | |
| 160 | |
| 161 data >>= 1; | |
| 162 } | |
| 163 | |
| 164 return(result); | |
| 165 } | |
| 166 | |
| 167 /*----------------------------------------------------------------------------- | |
| 168 * Write a block of bytes to the 1-wire bus and return the sampled result in | |
| 169 * the same buffer | |
| 170 */ | |
| 171 void | |
| 172 OWBlock(uint8_t *data, int len) { | |
| 173 int i; | |
| 174 | |
| 175 for (i = 0; i < len; i++) | |
| 176 data[i] = OWTouchByte(data[i]); | |
| 177 } | |
| 178 | |
| 179 | |
| 180 /*----------------------------------------------------------------------------- | |
| 181 * Send a 1 wire command to a device, or all if no ROM ID provided | |
| 182 */ | |
| 183 void | |
| 184 OWSendCmd(uint8_t *ROM, uint8_t cmd) { | |
| 12 | 185 uint8_t i; |
| 0 | 186 |
| 187 OWTouchReset(); | |
| 188 | |
| 189 if (ROM == NULL) | |
| 190 OWWriteByte(OW_SKIP_ROM_CMD); | |
| 191 else { | |
| 192 OWWriteByte(OW_MATCH_ROM_CMD); | |
| 193 for (i = 0; i < 8; i++) | |
| 194 OWWriteByte(ROM[i]); | |
| 195 } | |
| 196 | |
| 197 OWWriteByte(cmd); | |
| 198 } | |
| 199 | |
| 200 /*----------------------------------------------------------------------------- | |
| 201 * Search algorithm from App note 187 (and 162) | |
| 202 * | |
| 10 | 203 * OWFirst/OWNext return.. |
| 204 * 1 when something is found, | |
| 205 * 0 no more modules | |
| 16 | 206 * -1 if no presence pulse, |
| 10 | 207 * -2 if bad CRC, |
| 208 * -3 if bad wiring. | |
| 0 | 209 */ |
| 12 | 210 uint8_t |
| 0 | 211 OWFirst(uint8_t *ROM, uint8_t do_reset, uint8_t alarm_only) { |
| 212 /* Reset state */ | |
| 213 OW_LastDiscrepancy = 0; | |
| 214 OW_LastDevice = 0; | |
| 215 OW_LastFamilyDiscrepancy = 0; | |
| 216 | |
| 217 /* Go looking */ | |
| 218 return (OWNext(ROM, do_reset, alarm_only)); | |
| 219 } | |
| 220 | |
| 221 /* Returns 1 when something is found, 0 if nothing left */ | |
| 12 | 222 uint8_t |
| 0 | 223 OWNext(uint8_t *ROM, uint8_t do_reset, uint8_t alarm_only) { |
| 224 uint8_t bit_test, search_direction, bit_number; | |
| 10 | 225 uint8_t last_zero, rom_byte_number, rom_byte_mask; |
| 0 | 226 uint8_t lastcrc8, crcaccum; |
| 12 | 227 int8_t next_result; |
| 0 | 228 |
| 229 /* Init for search */ | |
| 21 | 230 bit_number = 1; |
| 231 last_zero = 0; | |
| 232 rom_byte_number = 0; | |
| 233 rom_byte_mask = 1; | |
| 234 next_result = OW_NOMODULES; | |
| 235 lastcrc8 = 0; | |
| 236 crcaccum = 0; | |
| 0 | 237 |
| 21 | 238 /* if the last call was not the last one */ |
| 239 if (!OW_LastDevice) { | |
| 240 /* check if reset first is requested */ | |
| 241 if (do_reset) { | |
| 242 /* reset the 1-wire | |
| 243 * if there are no parts on 1-wire, return 0 */ | |
| 0 | 244 #if OW_DEBUG |
| 21 | 245 uart_putsP(PSTR("Resetting\n\r")); |
| 0 | 246 #endif |
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247 switch (OWTouchReset()) { |
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248 case 0: |
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249 break; |
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250 |
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251 case 1: |
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252 /* reset the search */ |
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253 OW_LastDiscrepancy = 0; |
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254 OW_LastFamilyDiscrepancy = 0; |
| 0 | 255 #if OW_DEBUG |
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256 uart_putsP(PSTR("No devices on bus\n\r")); |
| 0 | 257 #endif |
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258 return OW_NOPRESENCE; |
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259 break; |
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260 |
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261 case 2: |
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262 /* reset the search */ |
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263 OW_LastDiscrepancy = 0; |
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264 OW_LastFamilyDiscrepancy = 0; |
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265 #if OW_DEBUG |
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266 uart_putsP(PSTR("Bus appears to be being held low\n\r")); |
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267 #endif |
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268 return OW_BADWIRE; |
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269 break; |
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270 |
| 21 | 271 } |
| 272 } | |
| 0 | 273 |
| 21 | 274 /* If finding alarming devices issue a different command */ |
| 275 if (alarm_only) | |
| 276 OWWriteByte(OW_SEARCH_ALRM_CMD); /* issue the alarming search command */ | |
| 277 else | |
| 278 OWWriteByte(OW_SEARCH_ROM_CMD); /* issue the search command */ | |
| 0 | 279 |
| 21 | 280 /* pause before beginning the search */ |
| 281 OWdelay(); | |
| 282 OWdelay(); | |
| 283 OWdelay(); | |
| 0 | 284 |
| 21 | 285 /* loop to do the search */ |
| 286 do { | |
| 287 /* read a bit and its compliment */ | |
| 288 bit_test = OWReadBit() << 1; | |
| 289 bit_test |= OWReadBit(); | |
| 0 | 290 |
| 291 #if OW_DEBUG | |
| 21 | 292 sprintf_P(errstr, PSTR("bit_test = %d\n\r"), bit_test); |
| 293 uart_puts(errstr); | |
| 0 | 294 #endif |
| 295 | |
| 21 | 296 /* check for no devices on 1-wire */ |
| 297 if (bit_test == 3) { | |
| 10 | 298 #if OW_DEBUG |
| 21 | 299 sprintf_P(errstr, PSTR("bit_test = %d\n\r"), bit_test); |
| 300 uart_puts(errstr); | |
| 10 | 301 #endif |
| 21 | 302 return(OW_BADWIRE); |
| 303 } | |
| 304 else { | |
| 305 /* all devices coupled have 0 or 1 */ | |
| 306 if (bit_test > 0) | |
| 307 search_direction = !(bit_test & 0x01); /* bit write value for search */ | |
| 308 else { | |
| 309 /* if this discrepancy is before the Last Discrepancy | |
| 310 * on a previous OWNext then pick the same as last time */ | |
| 311 if (bit_number < OW_LastDiscrepancy) | |
| 312 search_direction = ((ROM[rom_byte_number] & rom_byte_mask) > 0); | |
| 313 else | |
| 314 /* if equal to last pick 1, if not then pick 0 */ | |
| 315 search_direction = (bit_number == OW_LastDiscrepancy); | |
| 0 | 316 |
| 21 | 317 /* if 0 was picked then record its position in LastZero */ |
| 318 if (search_direction == 0) { | |
| 319 last_zero = bit_number; | |
| 0 | 320 |
| 21 | 321 /* check for Last discrepancy in family */ |
| 322 if (last_zero < 9) | |
| 323 OW_LastFamilyDiscrepancy = last_zero; | |
| 324 } | |
| 325 } | |
| 0 | 326 |
| 21 | 327 /* set or clear the bit in the ROM byte rom_byte_number |
| 328 * with mask rom_byte_mask */ | |
| 329 if (search_direction == 1) | |
| 330 ROM[rom_byte_number] |= rom_byte_mask; | |
| 331 else | |
| 332 ROM[rom_byte_number] &= ~rom_byte_mask; | |
| 0 | 333 |
| 21 | 334 /* serial number search direction write bit */ |
| 335 OWWriteBit(search_direction); | |
| 0 | 336 |
| 21 | 337 /* increment the byte counter bit_number |
| 338 * and shift the mask rom_byte_mask */ | |
| 339 bit_number++; | |
| 340 rom_byte_mask <<= 1; | |
| 0 | 341 |
| 21 | 342 /* if the mask is 0 then go to new ROM byte rom_byte_number |
| 343 * and reset mask */ | |
| 344 if (rom_byte_mask == 0) { | |
| 345 OWCRC(ROM[rom_byte_number], &crcaccum); /* accumulate the CRC */ | |
| 346 lastcrc8 = crcaccum; | |
| 0 | 347 |
| 21 | 348 rom_byte_number++; |
| 349 rom_byte_mask = 1; | |
| 350 } | |
| 351 } | |
| 352 } while (rom_byte_number < 8); /* loop until through all ROM bytes 0-7 */ | |
| 0 | 353 |
| 21 | 354 /* if the search was successful then */ |
| 355 if (!(bit_number < 65) || lastcrc8) { | |
| 356 if (lastcrc8) { | |
| 12 | 357 #if OW_DEBUG |
| 21 | 358 sprintf_P(errstr, PSTR("Bad CRC (%d)\n\r"), lastcrc8); |
| 359 uart_puts(errstr); | |
| 12 | 360 #endif |
| 21 | 361 next_result = OW_BADCRC; |
| 362 } else { | |
| 363 /* search successful so set LastDiscrepancy,LastDevice,next_result */ | |
| 364 OW_LastDiscrepancy = last_zero; | |
| 365 OW_LastDevice = (OW_LastDiscrepancy == 0); | |
| 0 | 366 #if OW_DEBUG |
| 21 | 367 sprintf_P(errstr, PSTR("Last device = %d\n\r"), OW_LastDevice); |
| 368 uart_puts(errstr); | |
| 0 | 369 #endif |
| 21 | 370 next_result = OW_FOUND; |
| 371 } | |
| 372 } | |
| 373 } | |
| 0 | 374 |
| 21 | 375 /* if no device found then reset counters so next 'next' will be |
| 376 * like a first */ | |
| 377 if (next_result != OW_FOUND || ROM[0] == 0) { | |
| 378 OW_LastDiscrepancy = 0; | |
| 379 OW_LastDevice = 0; | |
| 380 OW_LastFamilyDiscrepancy = 0; | |
| 381 } | |
| 0 | 382 |
| 21 | 383 if (next_result == OW_FOUND && ROM[0] == 0x00) |
| 384 next_result = OW_BADWIRE; | |
| 10 | 385 |
| 21 | 386 return next_result; |
| 0 | 387 |
| 388 } | |
| 389 | |
| 390 uint8_t PROGMEM dscrc_table[] = { | |
| 391 0, 94, 188, 226, 97, 63, 221, 131, 194, 156, 126, 32, 163, 253, 31, 65, | |
| 392 157, 195, 33, 127, 252, 162, 64, 30, 95, 1, 227, 189, 62, 96, 130, 220, | |
| 393 35, 125, 159, 193, 66, 28, 254, 160, 225, 191, 93, 3, 128, 222, 60, 98, | |
| 394 190, 224, 2, 92, 223, 129, 99, 61, 124, 34, 192, 158, 29, 67, 161, 255, | |
| 395 70, 24, 250, 164, 39, 121, 155, 197, 132, 218, 56, 102, 229, 187, 89, 7, | |
| 396 219, 133,103, 57, 186, 228, 6, 88, 25, 71, 165, 251, 120, 38, 196, 154, | |
| 397 101, 59, 217, 135, 4, 90, 184, 230, 167, 249, 27, 69, 198, 152, 122, 36, | |
| 398 248, 166, 68, 26, 153, 199, 37, 123, 58, 100, 134, 216, 91, 5, 231, 185, | |
| 399 140,210, 48, 110, 237, 179, 81, 15, 78, 16, 242, 172, 47, 113,147, 205, | |
| 400 17, 79, 173, 243, 112, 46, 204, 146, 211,141, 111, 49, 178, 236, 14, 80, | |
| 401 175, 241, 19, 77, 206, 144, 114, 44, 109, 51, 209, 143, 12, 82,176, 238, | |
| 402 50, 108, 142, 208, 83, 13, 239, 177, 240, 174, 76, 18, 145, 207, 45, 115, | |
| 403 202, 148, 118, 40, 171, 245, 23, 73, 8, 86, 180, 234, 105, 55, 213, 139, | |
| 404 87, 9, 235, 181, 54, 104, 138, 212, 149, 203, 41, 119, 244, 170, 72, 22, | |
| 405 233, 183, 85, 11, 136, 214, 52, 106, 43, 117, 151, 201, 74, 20, 246, 168, | |
| 406 116, 42, 200, 150, 21, 75, 169, 247, 182, 232, 10, 84, 215, 137, 107, 53 | |
| 407 }; | |
| 408 | |
| 409 void | |
| 410 OWCRC(uint8_t x, uint8_t *crc) { | |
| 411 *crc = pgm_read_byte(&dscrc_table[(*crc) ^ x]); | |
| 412 } |