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annotate 1wire.c @ 30:48056516b3eb
Make sure our outputs are pulled high.
| author | darius |
|---|---|
| date | Mon, 10 Apr 2006 17:23:51 +0930 |
| parents | 02b67e09ca12 |
| children | b0cb873c0206 |
| 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 * |
| 0 | 60 * (NOTE: Does not handle alarm presence from DS2404/DS1994) |
| 61 */ | |
| 12 | 62 uint8_t |
| 0 | 63 OWTouchReset(void) { |
| 10 | 64 DELAY_G; |
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65 |
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66 if (!(OWIREINPORT & _BV(OWIREINPIN))) |
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67 return 2; |
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68 |
| 10 | 69 OWIREOUTPORT &= ~(_BV(OWIREOUTPIN)); |
| 70 OWIREDDR |= _BV(OWIREOUTPIN); | |
| 71 DELAY_H; | |
| 72 OWIREDDR &= ~(_BV(OWIREOUTPIN)); | |
| 73 DELAY_I; | |
| 0 | 74 |
| 10 | 75 return(OWIREINPORT & _BV(OWIREINPIN) ? 1 : 0); |
| 0 | 76 } |
| 77 | |
| 78 /*----------------------------------------------------------------------------- | |
| 79 * Send a 1-wire write bit. | |
| 80 */ | |
| 81 void | |
| 12 | 82 OWWriteBit(uint8_t bit) { |
| 0 | 83 OWdelay(); |
| 84 if (bit) { | |
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85 OWIREOUTPORT &= ~(_BV(OWIREOUTPIN)); |
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86 OWIREDDR |= _BV(OWIREOUTPIN); |
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87 DELAY_A; |
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88 OWIREDDR &= ~(_BV(OWIREOUTPIN)); |
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89 DELAY_B; |
| 0 | 90 } else { |
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91 OWIREOUTPORT &= ~(_BV(OWIREOUTPIN)); |
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92 OWIREDDR |= _BV(OWIREOUTPIN); |
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93 DELAY_C; |
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94 OWIREDDR &= ~(_BV(OWIREOUTPIN)); |
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95 DELAY_D; |
| 0 | 96 } |
| 97 } | |
| 98 | |
| 99 /*----------------------------------------------------------------------------- | |
| 100 * Read a bit from the 1-wire bus and return it. | |
| 101 */ | |
| 12 | 102 uint8_t |
| 0 | 103 OWReadBit(void) { |
| 104 OWdelay(); | |
| 105 | |
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106 OWIREOUTPORT &= ~(_BV(OWIREOUTPIN)); |
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107 OWIREDDR |= _BV(OWIREOUTPIN); |
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108 DELAY_A; |
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109 OWIREDDR &= ~(_BV(OWIREOUTPIN)); |
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110 DELAY_E; |
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111 return(OWIREINPORT & _BV(OWIREINPIN) ? 1 : 0); |
| 0 | 112 } |
| 113 | |
| 114 /*----------------------------------------------------------------------------- | |
| 115 * Write a byte to the 1-wire bus | |
| 116 */ | |
| 117 void | |
| 118 OWWriteByte(uint8_t data) { | |
| 12 | 119 uint8_t i; |
| 0 | 120 |
| 121 /* Send LSB first */ | |
| 122 for (i = 0; i < 8; i++) { | |
| 123 OWWriteBit(data & 0x01); | |
| 124 data >>= 1; | |
| 125 } | |
| 126 } | |
| 127 | |
| 128 /*----------------------------------------------------------------------------- | |
| 129 * Read a byte from the 1-wire bus | |
| 130 */ | |
| 12 | 131 uint8_t |
| 0 | 132 OWReadByte(void) { |
| 133 int i, result = 0; | |
| 134 | |
| 135 for (i = 0; i < 8; i++) { | |
| 136 result >>= 1; | |
| 137 if (OWReadBit()) | |
| 138 result |= 0x80; | |
| 139 } | |
| 140 return(result); | |
| 141 } | |
| 142 | |
| 143 /*----------------------------------------------------------------------------- | |
| 144 * Write a 1-wire data byte and return the sampled result. | |
| 145 */ | |
| 12 | 146 uint8_t |
| 0 | 147 OWTouchByte(uint8_t data) { |
| 12 | 148 uint8_t i, result = 0; |
| 0 | 149 |
| 150 for (i = 0; i < 8; i++) { | |
| 151 result >>= 1; | |
| 152 | |
| 153 /* If sending a 1 then read a bit, otherwise write a 0 */ | |
| 154 if (data & 0x01) { | |
| 155 if (OWReadBit()) | |
| 156 result |= 0x80; | |
| 157 } else | |
| 158 OWWriteBit(0); | |
| 159 | |
| 160 data >>= 1; | |
| 161 } | |
| 162 | |
| 163 return(result); | |
| 164 } | |
| 165 | |
| 166 /*----------------------------------------------------------------------------- | |
| 167 * Write a block of bytes to the 1-wire bus and return the sampled result in | |
| 168 * the same buffer | |
| 169 */ | |
| 170 void | |
| 171 OWBlock(uint8_t *data, int len) { | |
| 172 int i; | |
| 173 | |
| 174 for (i = 0; i < len; i++) | |
| 175 data[i] = OWTouchByte(data[i]); | |
| 176 } | |
| 177 | |
| 178 | |
| 179 /*----------------------------------------------------------------------------- | |
| 180 * Send a 1 wire command to a device, or all if no ROM ID provided | |
| 181 */ | |
| 182 void | |
| 183 OWSendCmd(uint8_t *ROM, uint8_t cmd) { | |
| 12 | 184 uint8_t i; |
| 0 | 185 |
| 186 OWTouchReset(); | |
| 187 | |
| 188 if (ROM == NULL) | |
| 189 OWWriteByte(OW_SKIP_ROM_CMD); | |
| 190 else { | |
| 191 OWWriteByte(OW_MATCH_ROM_CMD); | |
| 192 for (i = 0; i < 8; i++) | |
| 193 OWWriteByte(ROM[i]); | |
| 194 } | |
| 195 | |
| 196 OWWriteByte(cmd); | |
| 197 } | |
| 198 | |
| 199 /*----------------------------------------------------------------------------- | |
| 200 * Search algorithm from App note 187 (and 162) | |
| 201 * | |
| 10 | 202 * OWFirst/OWNext return.. |
| 203 * 1 when something is found, | |
| 204 * 0 no more modules | |
| 16 | 205 * -1 if no presence pulse, |
| 10 | 206 * -2 if bad CRC, |
| 207 * -3 if bad wiring. | |
| 0 | 208 */ |
| 12 | 209 uint8_t |
| 0 | 210 OWFirst(uint8_t *ROM, uint8_t do_reset, uint8_t alarm_only) { |
| 211 /* Reset state */ | |
| 212 OW_LastDiscrepancy = 0; | |
| 213 OW_LastDevice = 0; | |
| 214 OW_LastFamilyDiscrepancy = 0; | |
| 215 | |
| 216 /* Go looking */ | |
| 217 return (OWNext(ROM, do_reset, alarm_only)); | |
| 218 } | |
| 219 | |
| 220 /* Returns 1 when something is found, 0 if nothing left */ | |
| 12 | 221 uint8_t |
| 0 | 222 OWNext(uint8_t *ROM, uint8_t do_reset, uint8_t alarm_only) { |
| 223 uint8_t bit_test, search_direction, bit_number; | |
| 10 | 224 uint8_t last_zero, rom_byte_number, rom_byte_mask; |
| 0 | 225 uint8_t lastcrc8, crcaccum; |
| 12 | 226 int8_t next_result; |
| 0 | 227 |
| 228 /* Init for search */ | |
| 21 | 229 bit_number = 1; |
| 230 last_zero = 0; | |
| 231 rom_byte_number = 0; | |
| 232 rom_byte_mask = 1; | |
| 233 next_result = OW_NOMODULES; | |
| 234 lastcrc8 = 0; | |
| 235 crcaccum = 0; | |
| 0 | 236 |
| 21 | 237 /* if the last call was not the last one */ |
| 238 if (!OW_LastDevice) { | |
| 239 /* check if reset first is requested */ | |
| 240 if (do_reset) { | |
| 241 /* reset the 1-wire | |
| 242 * if there are no parts on 1-wire, return 0 */ | |
| 0 | 243 #if OW_DEBUG |
| 21 | 244 uart_putsP(PSTR("Resetting\n\r")); |
| 0 | 245 #endif |
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246 switch (OWTouchReset()) { |
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247 case 0: |
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248 break; |
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249 |
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250 case 1: |
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251 /* reset the search */ |
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252 OW_LastDiscrepancy = 0; |
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253 OW_LastFamilyDiscrepancy = 0; |
| 0 | 254 #if OW_DEBUG |
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255 uart_putsP(PSTR("No devices on bus\n\r")); |
| 0 | 256 #endif |
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257 return OW_NOPRESENCE; |
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258 break; |
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259 |
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260 case 2: |
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261 /* reset the search */ |
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262 OW_LastDiscrepancy = 0; |
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263 OW_LastFamilyDiscrepancy = 0; |
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264 #if OW_DEBUG |
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265 uart_putsP(PSTR("Bus appears to be being held low\n\r")); |
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266 #endif |
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267 return OW_BADWIRE; |
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268 break; |
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269 |
| 21 | 270 } |
| 271 } | |
| 0 | 272 |
| 21 | 273 /* If finding alarming devices issue a different command */ |
| 274 if (alarm_only) | |
| 275 OWWriteByte(OW_SEARCH_ALRM_CMD); /* issue the alarming search command */ | |
| 276 else | |
| 277 OWWriteByte(OW_SEARCH_ROM_CMD); /* issue the search command */ | |
| 0 | 278 |
| 21 | 279 /* pause before beginning the search */ |
| 280 OWdelay(); | |
| 281 OWdelay(); | |
| 282 OWdelay(); | |
| 0 | 283 |
| 21 | 284 /* loop to do the search */ |
| 285 do { | |
| 286 /* read a bit and its compliment */ | |
| 287 bit_test = OWReadBit() << 1; | |
| 288 bit_test |= OWReadBit(); | |
| 0 | 289 |
| 290 #if OW_DEBUG | |
| 21 | 291 sprintf_P(errstr, PSTR("bit_test = %d\n\r"), bit_test); |
| 292 uart_puts(errstr); | |
| 0 | 293 #endif |
| 294 | |
| 21 | 295 /* check for no devices on 1-wire */ |
| 296 if (bit_test == 3) { | |
| 10 | 297 #if OW_DEBUG |
| 21 | 298 sprintf_P(errstr, PSTR("bit_test = %d\n\r"), bit_test); |
| 299 uart_puts(errstr); | |
| 10 | 300 #endif |
| 21 | 301 return(OW_BADWIRE); |
| 302 } | |
| 303 else { | |
| 304 /* all devices coupled have 0 or 1 */ | |
| 305 if (bit_test > 0) | |
| 306 search_direction = !(bit_test & 0x01); /* bit write value for search */ | |
| 307 else { | |
| 308 /* if this discrepancy is before the Last Discrepancy | |
| 309 * on a previous OWNext then pick the same as last time */ | |
| 310 if (bit_number < OW_LastDiscrepancy) | |
| 311 search_direction = ((ROM[rom_byte_number] & rom_byte_mask) > 0); | |
| 312 else | |
| 313 /* if equal to last pick 1, if not then pick 0 */ | |
| 314 search_direction = (bit_number == OW_LastDiscrepancy); | |
| 0 | 315 |
| 21 | 316 /* if 0 was picked then record its position in LastZero */ |
| 317 if (search_direction == 0) { | |
| 318 last_zero = bit_number; | |
| 0 | 319 |
| 21 | 320 /* check for Last discrepancy in family */ |
| 321 if (last_zero < 9) | |
| 322 OW_LastFamilyDiscrepancy = last_zero; | |
| 323 } | |
| 324 } | |
| 0 | 325 |
| 21 | 326 /* set or clear the bit in the ROM byte rom_byte_number |
| 327 * with mask rom_byte_mask */ | |
| 328 if (search_direction == 1) | |
| 329 ROM[rom_byte_number] |= rom_byte_mask; | |
| 330 else | |
| 331 ROM[rom_byte_number] &= ~rom_byte_mask; | |
| 0 | 332 |
| 21 | 333 /* serial number search direction write bit */ |
| 334 OWWriteBit(search_direction); | |
| 0 | 335 |
| 21 | 336 /* increment the byte counter bit_number |
| 337 * and shift the mask rom_byte_mask */ | |
| 338 bit_number++; | |
| 339 rom_byte_mask <<= 1; | |
| 0 | 340 |
| 21 | 341 /* if the mask is 0 then go to new ROM byte rom_byte_number |
| 342 * and reset mask */ | |
| 343 if (rom_byte_mask == 0) { | |
| 344 OWCRC(ROM[rom_byte_number], &crcaccum); /* accumulate the CRC */ | |
| 345 lastcrc8 = crcaccum; | |
| 0 | 346 |
| 21 | 347 rom_byte_number++; |
| 348 rom_byte_mask = 1; | |
| 349 } | |
| 350 } | |
| 351 } while (rom_byte_number < 8); /* loop until through all ROM bytes 0-7 */ | |
| 0 | 352 |
| 21 | 353 /* if the search was successful then */ |
| 354 if (!(bit_number < 65) || lastcrc8) { | |
| 355 if (lastcrc8) { | |
| 12 | 356 #if OW_DEBUG |
| 21 | 357 sprintf_P(errstr, PSTR("Bad CRC (%d)\n\r"), lastcrc8); |
| 358 uart_puts(errstr); | |
| 12 | 359 #endif |
| 21 | 360 next_result = OW_BADCRC; |
| 361 } else { | |
| 362 /* search successful so set LastDiscrepancy,LastDevice,next_result */ | |
| 363 OW_LastDiscrepancy = last_zero; | |
| 364 OW_LastDevice = (OW_LastDiscrepancy == 0); | |
| 0 | 365 #if OW_DEBUG |
| 21 | 366 sprintf_P(errstr, PSTR("Last device = %d\n\r"), OW_LastDevice); |
| 367 uart_puts(errstr); | |
| 0 | 368 #endif |
| 21 | 369 next_result = OW_FOUND; |
| 370 } | |
| 371 } | |
| 372 } | |
| 0 | 373 |
| 21 | 374 /* if no device found then reset counters so next 'next' will be |
| 375 * like a first */ | |
| 376 if (next_result != OW_FOUND || ROM[0] == 0) { | |
| 377 OW_LastDiscrepancy = 0; | |
| 378 OW_LastDevice = 0; | |
| 379 OW_LastFamilyDiscrepancy = 0; | |
| 380 } | |
| 0 | 381 |
| 21 | 382 if (next_result == OW_FOUND && ROM[0] == 0x00) |
| 383 next_result = OW_BADWIRE; | |
| 10 | 384 |
| 21 | 385 return next_result; |
| 0 | 386 |
| 387 } | |
| 388 | |
| 389 uint8_t PROGMEM dscrc_table[] = { | |
| 390 0, 94, 188, 226, 97, 63, 221, 131, 194, 156, 126, 32, 163, 253, 31, 65, | |
| 391 157, 195, 33, 127, 252, 162, 64, 30, 95, 1, 227, 189, 62, 96, 130, 220, | |
| 392 35, 125, 159, 193, 66, 28, 254, 160, 225, 191, 93, 3, 128, 222, 60, 98, | |
| 393 190, 224, 2, 92, 223, 129, 99, 61, 124, 34, 192, 158, 29, 67, 161, 255, | |
| 394 70, 24, 250, 164, 39, 121, 155, 197, 132, 218, 56, 102, 229, 187, 89, 7, | |
| 395 219, 133,103, 57, 186, 228, 6, 88, 25, 71, 165, 251, 120, 38, 196, 154, | |
| 396 101, 59, 217, 135, 4, 90, 184, 230, 167, 249, 27, 69, 198, 152, 122, 36, | |
| 397 248, 166, 68, 26, 153, 199, 37, 123, 58, 100, 134, 216, 91, 5, 231, 185, | |
| 398 140,210, 48, 110, 237, 179, 81, 15, 78, 16, 242, 172, 47, 113,147, 205, | |
| 399 17, 79, 173, 243, 112, 46, 204, 146, 211,141, 111, 49, 178, 236, 14, 80, | |
| 400 175, 241, 19, 77, 206, 144, 114, 44, 109, 51, 209, 143, 12, 82,176, 238, | |
| 401 50, 108, 142, 208, 83, 13, 239, 177, 240, 174, 76, 18, 145, 207, 45, 115, | |
| 402 202, 148, 118, 40, 171, 245, 23, 73, 8, 86, 180, 234, 105, 55, 213, 139, | |
| 403 87, 9, 235, 181, 54, 104, 138, 212, 149, 203, 41, 119, 244, 170, 72, 22, | |
| 404 233, 183, 85, 11, 136, 214, 52, 106, 43, 117, 151, 201, 74, 20, 246, 168, | |
| 405 116, 42, 200, 150, 21, 75, 169, 247, 182, 232, 10, 84, 215, 137, 107, 53 | |
| 406 }; | |
| 407 | |
| 408 void | |
| 409 OWCRC(uint8_t x, uint8_t *crc) { | |
| 410 *crc = pgm_read_byte(&dscrc_table[(*crc) ^ x]); | |
| 411 } |