frederic blanc / OneWire_II

MAX31850, DS18B20, DS2450, thermocouple

onewire.cpp@0:5d39f2521173, 2015-03-09 (annotated)

Committer:
fblanc
Date:
Mon Mar 09 11:55:54 2015 +0000
Revision:
0:5d39f2521173
MAX31850

Who changed what in which revision?

UserRevisionLine numberNew contents of line
fblanc 0:5d39f2521173 1 /**
fblanc 0:5d39f2521173 2 * @file onewire.c
fblanc 0:5d39f2521173 3 * @brief library 1-Wire(www.maxim-ic.com)
fblanc 0:5d39f2521173 4 * @author Maciej Rajtar (Published 10 May 2010 www.mbed.org)
fblanc 0:5d39f2521173 5 * @author Frederic BLANC (Published 01/03/2012 www.mbed.org)
fblanc 0:5d39f2521173 6 */
fblanc 0:5d39f2521173 7
fblanc 0:5d39f2521173 8 #include "mbed.h"
fblanc 0:5d39f2521173 9 #include "onewire.h"
fblanc 0:5d39f2521173 10
fblanc 0:5d39f2521173 11 DigitalInOut ow_pin(p21);
fblanc 0:5d39f2521173 12 DigitalInOut ow_0(p21);
fblanc 0:5d39f2521173 13 DigitalInOut ow_1(p22);
fblanc 0:5d39f2521173 14 DigitalInOut ow_2(p23);
fblanc 0:5d39f2521173 15 DigitalInOut ow_3(p24);
fblanc 0:5d39f2521173 16 DigitalInOut* t_ow[4]={&ow_0,&ow_1,&ow_2,&ow_3};
fblanc 0:5d39f2521173 17
fblanc 0:5d39f2521173 18 //**********************************************************************************************************
fblanc 0:5d39f2521173 19 //* show_id
fblanc 0:5d39f2521173 20 //**********************************************************************************************************
fblanc 0:5d39f2521173 21
fblanc 0:5d39f2521173 22
fblanc 0:5d39f2521173 23 /**
fblanc 0:5d39f2521173 24 * @brief show_id
fblanc 0:5d39f2521173 25 * @param [in] id[] = rom_code
fblanc 0:5d39f2521173 26 * @param [out] text id
fblanc 0:5d39f2521173 27 * @date 02/12/2013
fblanc 0:5d39f2521173 28 */
fblanc 0:5d39f2521173 29 char* ow_show_id( uint8_t id[],char *text) {
fblanc 0:5d39f2521173 30
fblanc 0:5d39f2521173 31 char hex[4];
fblanc 0:5d39f2521173 32 sprintf(text,"");
fblanc 0:5d39f2521173 33 sprintf(hex,"%2.2X",id[0]);
fblanc 0:5d39f2521173 34 strcat(text,hex);
fblanc 0:5d39f2521173 35 for (int i = OW_ROMCODE_SIZE-2; i >=1 ; --i ) {
fblanc 0:5d39f2521173 36 sprintf(hex,"%2.2X",id[i]);
fblanc 0:5d39f2521173 37 strcat(text,hex);
fblanc 0:5d39f2521173 38 }
fblanc 0:5d39f2521173 39 sprintf(hex,"%2.2X",id[OW_ROMCODE_SIZE-1]);
fblanc 0:5d39f2521173 40 strcat(text,hex);
fblanc 0:5d39f2521173 41 return text;
fblanc 0:5d39f2521173 42
fblanc 0:5d39f2521173 43 }
fblanc 0:5d39f2521173 44 //**********************************************************************************************************
fblanc 0:5d39f2521173 45 //* show_id
fblanc 0:5d39f2521173 46 //**********************************************************************************************************
fblanc 0:5d39f2521173 47
fblanc 0:5d39f2521173 48
fblanc 0:5d39f2521173 49 /**
fblanc 0:5d39f2521173 50 * @brief uint64_id
fblanc 0:5d39f2521173 51 * @param [in] id[] = rom_code
fblanc 0:5d39f2521173 52 * @return [out] uint64_t id
fblanc 0:5d39f2521173 53 * @date 28/03/2011
fblanc 0:5d39f2521173 54 */
fblanc 0:5d39f2521173 55 uint64_t uint64_id( uint8_t id[]) {
fblanc 0:5d39f2521173 56
fblanc 0:5d39f2521173 57 uint64_t *ptr;
fblanc 0:5d39f2521173 58
fblanc 0:5d39f2521173 59 ptr=(uint64_t *) &id[0];
fblanc 0:5d39f2521173 60
fblanc 0:5d39f2521173 61 return *ptr;
fblanc 0:5d39f2521173 62 }
fblanc 0:5d39f2521173 63 //**********************************************************************************************************
fblanc 0:5d39f2521173 64 //* search_sensors
fblanc 0:5d39f2521173 65 //**********************************************************************************************************
fblanc 0:5d39f2521173 66
fblanc 0:5d39f2521173 67 /**
fblanc 0:5d39f2521173 68 * @brief search_sensors
fblanc 0:5d39f2521173 69 * @param [out] nSensors number of device onewire
fblanc 0:5d39f2521173 70 * @param [out] gSensorIDs[][] array of id romcode
fblanc 0:5d39f2521173 71 * @return OW_OK or OW_PRESENCE_ERR or OW_DATA_ERR
fblanc 0:5d39f2521173 72 * @date 20/06/2011
fblanc 0:5d39f2521173 73 */
fblanc 0:5d39f2521173 74 uint8_t search_sensors(uint8_t *nSensors,uint8_t gSensorIDs[][OW_ROMCODE_SIZE] ) {
fblanc 0:5d39f2521173 75
fblanc 0:5d39f2521173 76
fblanc 0:5d39f2521173 77 uint8_t i;
fblanc 0:5d39f2521173 78 uint8_t id[OW_ROMCODE_SIZE];
fblanc 0:5d39f2521173 79 uint8_t diff;
fblanc 0:5d39f2521173 80 printf( "Scanning Bus\r\n" );
fblanc 0:5d39f2521173 81 diff = OW_SEARCH_FIRST;
fblanc 0:5d39f2521173 82 for (*nSensors = 0 ; (diff != OW_LAST_DEVICE) && (*nSensors < MAXSENSORS) ;++(*nSensors) ) {
fblanc 0:5d39f2521173 83 ow_find_sensor( &diff, &id[0] );
fblanc 0:5d39f2521173 84 if ( diff == OW_PRESENCE_ERR ) {
fblanc 0:5d39f2521173 85 printf( "No Sensor found\r\n" );
fblanc 0:5d39f2521173 86 return diff;
fblanc 0:5d39f2521173 87 }
fblanc 0:5d39f2521173 88 if ( diff == OW_DATA_ERR ) {
fblanc 0:5d39f2521173 89 printf( "Bus Error\r\n" );
fblanc 0:5d39f2521173 90 return diff;
fblanc 0:5d39f2521173 91 }
fblanc 0:5d39f2521173 92 for (i=0;i<OW_ROMCODE_SIZE;i++)
fblanc 0:5d39f2521173 93 gSensorIDs[*nSensors][i]=id[i];
fblanc 0:5d39f2521173 94
fblanc 0:5d39f2521173 95 }
fblanc 0:5d39f2521173 96 return OW_OK;
fblanc 0:5d39f2521173 97 }
fblanc 0:5d39f2521173 98 /**
fblanc 0:5d39f2521173 99 * @brief search_sensors
fblanc 0:5d39f2521173 100 * @param [in] n num bus onewire
fblanc 0:5d39f2521173 101 * @param [out] nSensors number of device onewire
fblanc 0:5d39f2521173 102 * @param [out] gSensorIDs[][][] array of id romcode
fblanc 0:5d39f2521173 103 * @return OW_OK or OW_PRESENCE_ERR or OW_DATA_ERR
fblanc 0:5d39f2521173 104 * @date 02/09/2011
fblanc 0:5d39f2521173 105 */
fblanc 0:5d39f2521173 106 uint8_t search_sensors(uint8_t n,uint8_t *nSensors,uint8_t gSensorIDs[][MAXSENSORS][OW_ROMCODE_SIZE] ) {
fblanc 0:5d39f2521173 107
fblanc 0:5d39f2521173 108
fblanc 0:5d39f2521173 109 uint8_t i;
fblanc 0:5d39f2521173 110 uint8_t id[OW_ROMCODE_SIZE];
fblanc 0:5d39f2521173 111 uint8_t diff;
fblanc 0:5d39f2521173 112 printf( "Scanning Bus %d\r\n",n );
fblanc 0:5d39f2521173 113 diff = OW_SEARCH_FIRST;
fblanc 0:5d39f2521173 114 for (*nSensors = 0 ; (diff != OW_LAST_DEVICE) && (*nSensors < MAXSENSORS) ;++(*nSensors) ) {
fblanc 0:5d39f2521173 115 ow_find_sensor(n, &diff, &id[0] );
fblanc 0:5d39f2521173 116 if ( diff == OW_PRESENCE_ERR ) {
fblanc 0:5d39f2521173 117 printf( "No Sensor found\r\n" );
fblanc 0:5d39f2521173 118 return diff;
fblanc 0:5d39f2521173 119 }
fblanc 0:5d39f2521173 120 if ( diff == OW_DATA_ERR ) {
fblanc 0:5d39f2521173 121 printf( "Bus Error\r\n" );
fblanc 0:5d39f2521173 122 return diff;
fblanc 0:5d39f2521173 123 }
fblanc 0:5d39f2521173 124 for (i=0;i<OW_ROMCODE_SIZE;i++){
fblanc 0:5d39f2521173 125 gSensorIDs[n][*nSensors][i]=id[i];
fblanc 0:5d39f2521173 126 //printf( "id[%d]=%d\r\n" ,i,id[i]);
fblanc 0:5d39f2521173 127 }
fblanc 0:5d39f2521173 128
fblanc 0:5d39f2521173 129 }
fblanc 0:5d39f2521173 130 return OW_OK;
fblanc 0:5d39f2521173 131 }
fblanc 0:5d39f2521173 132 //**********************************************************************************************************
fblanc 0:5d39f2521173 133 //* find Sensors on 1-Wire-Bus
fblanc 0:5d39f2521173 134 //**********************************************************************************************************
fblanc 0:5d39f2521173 135
fblanc 0:5d39f2521173 136 /**
fblanc 0:5d39f2521173 137 * @brief find Sensors on 1-Wire-Bus
fblanc 0:5d39f2521173 138 * @param [in/out] diff is the result of the last rom-search
fblanc 0:5d39f2521173 139 * @param [out] is the rom-code of the sensor found
fblanc 0:5d39f2521173 140 * @return OW_OK or OW_ERROR
fblanc 0:5d39f2521173 141 * @date 20/06/2011
fblanc 0:5d39f2521173 142 */
fblanc 0:5d39f2521173 143 uint8_t ow_find_sensor(uint8_t *diff, uint8_t id[]) {
fblanc 0:5d39f2521173 144 for (;;)
fblanc 0:5d39f2521173 145 {
fblanc 0:5d39f2521173 146 *diff = ow_rom_search( *diff, &id[0] );
fblanc 0:5d39f2521173 147 if ( *diff==OW_PRESENCE_ERR)
fblanc 0:5d39f2521173 148 return OW_ERROR;
fblanc 0:5d39f2521173 149 if ( *diff==OW_DATA_ERR )
fblanc 0:5d39f2521173 150 return OW_ERROR;
fblanc 0:5d39f2521173 151 if ( *diff == OW_LAST_DEVICE )
fblanc 0:5d39f2521173 152 return OW_OK ;
fblanc 0:5d39f2521173 153 if ( id[0] == DS18B20_ID || id[0] == DS18S20_ID )
fblanc 0:5d39f2521173 154 return OW_OK ;
fblanc 0:5d39f2521173 155 if ( id[0] == DS2450_ID )
fblanc 0:5d39f2521173 156 return OW_OK ;
fblanc 0:5d39f2521173 157 if ( id[0] == MAX31850_ID )
fblanc 0:5d39f2521173 158 return OW_OK ;
fblanc 0:5d39f2521173 159 }
fblanc 0:5d39f2521173 160 }
fblanc 0:5d39f2521173 161
fblanc 0:5d39f2521173 162 /**
fblanc 0:5d39f2521173 163 * @brief find Sensors on 1-Wire-Bus
fblanc 0:5d39f2521173 164 * @param [in] num bus onewire
fblanc 0:5d39f2521173 165 * @param [in/out] diff is the result of the last rom-search
fblanc 0:5d39f2521173 166 * @param [out] is the rom-code of the sensor found
fblanc 0:5d39f2521173 167 * @return OW_OK or OW_ERROR
fblanc 0:5d39f2521173 168 * @date 30/08/2011
fblanc 0:5d39f2521173 169 */
fblanc 0:5d39f2521173 170 uint8_t ow_find_sensor(uint8_t n,uint8_t *diff, uint8_t id[]) {
fblanc 0:5d39f2521173 171 for (;;)
fblanc 0:5d39f2521173 172 {
fblanc 0:5d39f2521173 173 *diff = ow_rom_search(n, *diff, &id[0] );
fblanc 0:5d39f2521173 174 if ( *diff==OW_PRESENCE_ERR)
fblanc 0:5d39f2521173 175 return OW_ERROR;
fblanc 0:5d39f2521173 176 if ( *diff==OW_DATA_ERR )
fblanc 0:5d39f2521173 177 return OW_ERROR;
fblanc 0:5d39f2521173 178 if ( *diff == OW_LAST_DEVICE )
fblanc 0:5d39f2521173 179 return OW_OK ;
fblanc 0:5d39f2521173 180 if ( id[0] == DS18B20_ID || id[0] == DS18S20_ID )
fblanc 0:5d39f2521173 181 return OW_OK ;
fblanc 0:5d39f2521173 182 if ( id[0] == DS2450_ID )
fblanc 0:5d39f2521173 183 return OW_OK ;
fblanc 0:5d39f2521173 184 if ( id[0] == MAX31850_ID )
fblanc 0:5d39f2521173 185 return OW_OK ;
fblanc 0:5d39f2521173 186 }
fblanc 0:5d39f2521173 187 }
fblanc 0:5d39f2521173 188 //**********************************************************************************************************
fblanc 0:5d39f2521173 189 //* search romcode
fblanc 0:5d39f2521173 190 //**********************************************************************************************************
fblanc 0:5d39f2521173 191
fblanc 0:5d39f2521173 192 /**
fblanc 0:5d39f2521173 193 * @brief search romcode
fblanc 0:5d39f2521173 194 * @param [in] uint8_t diff
fblanc 0:5d39f2521173 195 * @param [out] id romcode
fblanc 0:5d39f2521173 196 * @return next_diff or OW_LAST_DEVICE or OW_DATA_ERR or OW_PRESENCE_ERR
fblanc 0:5d39f2521173 197 * @date 20/06/2011
fblanc 0:5d39f2521173 198 */
fblanc 0:5d39f2521173 199 uint8_t ow_rom_search( uint8_t diff, uint8_t id[] ) {
fblanc 0:5d39f2521173 200 uint8_t i, j, next_diff;
fblanc 0:5d39f2521173 201 uint8_t b;
fblanc 0:5d39f2521173 202
fblanc 0:5d39f2521173 203 if ( ow_reset() )
fblanc 0:5d39f2521173 204 return OW_PRESENCE_ERR; // error, no device found
fblanc 0:5d39f2521173 205 ow_byte_wr( OW_SEARCH_ROM ); // ROM search command
fblanc 0:5d39f2521173 206 next_diff = OW_LAST_DEVICE; // unchanged on last device
fblanc 0:5d39f2521173 207 i = OW_ROMCODE_SIZE * 8; // 8 bytes
fblanc 0:5d39f2521173 208 do {
fblanc 0:5d39f2521173 209 j = 8; // 8 bits
fblanc 0:5d39f2521173 210 do {
fblanc 0:5d39f2521173 211 b = ow_bit_io( 1 ); // read bit
fblanc 0:5d39f2521173 212 if ( ow_bit_io( 1 ) ) { // read complement bit
fblanc 0:5d39f2521173 213 if ( b ) // 11
fblanc 0:5d39f2521173 214 return OW_DATA_ERR; // data error
fblanc 0:5d39f2521173 215 } else {
fblanc 0:5d39f2521173 216 if ( !b ) { // 00 = 2 devices
fblanc 0:5d39f2521173 217 if ( diff > i || ((*id & 1) && diff != i) ) {
fblanc 0:5d39f2521173 218 b = 1; // now 1
fblanc 0:5d39f2521173 219 next_diff = i; // next pass 0
fblanc 0:5d39f2521173 220 }
fblanc 0:5d39f2521173 221 }
fblanc 0:5d39f2521173 222 }
fblanc 0:5d39f2521173 223 ow_bit_io( b ); // write bit
fblanc 0:5d39f2521173 224 *id >>= 1;
fblanc 0:5d39f2521173 225 if ( b )
fblanc 0:5d39f2521173 226 *id |= 0x80; // store bit
fblanc 0:5d39f2521173 227 --i;
fblanc 0:5d39f2521173 228 } while ( --j );
fblanc 0:5d39f2521173 229 id++; // next byte
fblanc 0:5d39f2521173 230 } while ( i );
fblanc 0:5d39f2521173 231 return next_diff; // to continue search
fblanc 0:5d39f2521173 232 }
fblanc 0:5d39f2521173 233 /**
fblanc 0:5d39f2521173 234 * @brief search romcode
fblanc 0:5d39f2521173 235 * @param [in]n num bus onewire
fblanc 0:5d39f2521173 236 * @param [in] uint8_t diff
fblanc 0:5d39f2521173 237 * @param [out] id romcode
fblanc 0:5d39f2521173 238 * @return next_diff or OW_LAST_DEVICE or OW_DATA_ERR or OW_PRESENCE_ERR
fblanc 0:5d39f2521173 239 * @date 30/08/2011
fblanc 0:5d39f2521173 240 */
fblanc 0:5d39f2521173 241 uint8_t ow_rom_search(uint8_t n, uint8_t diff, uint8_t id[] ) {
fblanc 0:5d39f2521173 242 uint8_t i, j, next_diff;
fblanc 0:5d39f2521173 243 uint8_t b;
fblanc 0:5d39f2521173 244 if ( ow_reset(n) )
fblanc 0:5d39f2521173 245 return OW_PRESENCE_ERR; // error, no device found
fblanc 0:5d39f2521173 246 ow_byte_wr(n, OW_SEARCH_ROM ); // ROM search command
fblanc 0:5d39f2521173 247 next_diff = OW_LAST_DEVICE; // unchanged on last device
fblanc 0:5d39f2521173 248 i = OW_ROMCODE_SIZE * 8; // 8 bytes
fblanc 0:5d39f2521173 249 do {
fblanc 0:5d39f2521173 250 j = 8; // 8 bits
fblanc 0:5d39f2521173 251 do {
fblanc 0:5d39f2521173 252 b = ow_bit_io(n, 1 ); // read bit
fblanc 0:5d39f2521173 253 if ( ow_bit_io(n, 1 ) ) { // read complement bit
fblanc 0:5d39f2521173 254 if ( b ) // 11
fblanc 0:5d39f2521173 255 {
fblanc 0:5d39f2521173 256
fblanc 0:5d39f2521173 257 return OW_DATA_ERR; // data error
fblanc 0:5d39f2521173 258 }
fblanc 0:5d39f2521173 259 } else {
fblanc 0:5d39f2521173 260 if ( !b ) { // 00 = 2 devices
fblanc 0:5d39f2521173 261 if ( diff > i || ((*id & 1) && diff != i) ) {
fblanc 0:5d39f2521173 262 b = 1; // now 1
fblanc 0:5d39f2521173 263 next_diff = i; // next pass 0
fblanc 0:5d39f2521173 264 }
fblanc 0:5d39f2521173 265 }
fblanc 0:5d39f2521173 266 }
fblanc 0:5d39f2521173 267 ow_bit_io(n, b ); // write bit
fblanc 0:5d39f2521173 268
fblanc 0:5d39f2521173 269 *id >>= 1;
fblanc 0:5d39f2521173 270 if ( b )
fblanc 0:5d39f2521173 271 *id |= 0x80; // store bit
fblanc 0:5d39f2521173 272 --i;
fblanc 0:5d39f2521173 273 } while ( --j );
fblanc 0:5d39f2521173 274 id++; // next byte
fblanc 0:5d39f2521173 275
fblanc 0:5d39f2521173 276 } while ( i );
fblanc 0:5d39f2521173 277
fblanc 0:5d39f2521173 278
fblanc 0:5d39f2521173 279 return next_diff; // to continue search
fblanc 0:5d39f2521173 280 }
fblanc 0:5d39f2521173 281
fblanc 0:5d39f2521173 282
fblanc 0:5d39f2521173 283 //**********************************************************************************************************
fblanc 0:5d39f2521173 284 //* test pin onewire bus
fblanc 0:5d39f2521173 285 //**********************************************************************************************************
fblanc 0:5d39f2521173 286 /**
fblanc 0:5d39f2521173 287 * @brief test pin onewire bus
fblanc 0:5d39f2521173 288 * @return etat pin ow
fblanc 0:5d39f2521173 289 * @date 20/06/2011
fblanc 0:5d39f2521173 290 */
fblanc 0:5d39f2521173 291 uint8_t ow_test_pin (void){
fblanc 0:5d39f2521173 292 if (ow_pin)
fblanc 0:5d39f2521173 293 return 1;
fblanc 0:5d39f2521173 294 return 0;
fblanc 0:5d39f2521173 295 }
fblanc 0:5d39f2521173 296
fblanc 0:5d39f2521173 297 /**
fblanc 0:5d39f2521173 298 * @brief test pin onewire bus
fblanc 0:5d39f2521173 299 * @param [in] num bus one wire
fblanc 0:5d39f2521173 300 * @return etat pin ow
fblanc 0:5d39f2521173 301 * @date 30/08/2011
fblanc 0:5d39f2521173 302 */
fblanc 0:5d39f2521173 303 uint8_t ow_test_pin (uint8_t n){
fblanc 0:5d39f2521173 304
fblanc 0:5d39f2521173 305 if (*t_ow[n])
fblanc 0:5d39f2521173 306 return 1;
fblanc 0:5d39f2521173 307 return 0;
fblanc 0:5d39f2521173 308 }
fblanc 0:5d39f2521173 309
fblanc 0:5d39f2521173 310 //**********************************************************************************************************
fblanc 0:5d39f2521173 311 //* onewire reset bus
fblanc 0:5d39f2521173 312 //**********************************************************************************************************
fblanc 0:5d39f2521173 313 /**
fblanc 0:5d39f2521173 314 * @brief onewire reset bus
fblanc 0:5d39f2521173 315 * @return pin ow or OW_SHORT_CIRCUIT
fblanc 0:5d39f2521173 316 * @date 20/06/2011
fblanc 0:5d39f2521173 317 */
fblanc 0:5d39f2521173 318 uint8_t ow_reset(void) { // reset. Should improve to act as a presence pulse
fblanc 0:5d39f2521173 319 uint8_t err;
fblanc 0:5d39f2521173 320
fblanc 0:5d39f2521173 321 ow_pin.output();
fblanc 0:5d39f2521173 322 ow_pin = 0; // bring low for 500 us
fblanc 0:5d39f2521173 323 wait_us(500);
fblanc 0:5d39f2521173 324 ow_pin.input();
fblanc 0:5d39f2521173 325 wait_us(60);
fblanc 0:5d39f2521173 326 err = ow_pin;
fblanc 0:5d39f2521173 327 wait_us(240);
fblanc 0:5d39f2521173 328 if ( ow_pin == 0 ) { // short circuit
fblanc 0:5d39f2521173 329 err = OW_SHORT_CIRCUIT;
fblanc 0:5d39f2521173 330 }
fblanc 0:5d39f2521173 331 return err;
fblanc 0:5d39f2521173 332 }
fblanc 0:5d39f2521173 333
fblanc 0:5d39f2521173 334 /**
fblanc 0:5d39f2521173 335 * @brief onewire reset bus
fblanc 0:5d39f2521173 336 * @param [in] num bus onewire
fblanc 0:5d39f2521173 337 * @return pin ow or OW_SHORT_CIRCUIT
fblanc 0:5d39f2521173 338 * @date 30/08/2011
fblanc 0:5d39f2521173 339 */
fblanc 0:5d39f2521173 340 uint8_t ow_reset(uint8_t n) { // reset. Should improve to act as a presence pulse
fblanc 0:5d39f2521173 341 uint8_t err;
fblanc 0:5d39f2521173 342
fblanc 0:5d39f2521173 343 t_ow[n]->output();
fblanc 0:5d39f2521173 344 *t_ow[n] = 0; // bring low for 500 us
fblanc 0:5d39f2521173 345 wait_us(500);
fblanc 0:5d39f2521173 346 t_ow[n]->input();
fblanc 0:5d39f2521173 347 wait_us(60);
fblanc 0:5d39f2521173 348 err = *t_ow[n];
fblanc 0:5d39f2521173 349 wait_us(240);
fblanc 0:5d39f2521173 350 if ( *t_ow[n] == 0 ) { // short circuit
fblanc 0:5d39f2521173 351 err = OW_SHORT_CIRCUIT;
fblanc 0:5d39f2521173 352
fblanc 0:5d39f2521173 353 }
fblanc 0:5d39f2521173 354 return err;
fblanc 0:5d39f2521173 355 }
fblanc 0:5d39f2521173 356 //**********************************************************************************************************
fblanc 0:5d39f2521173 357 //* read write onewire
fblanc 0:5d39f2521173 358 //**********************************************************************************************************
fblanc 0:5d39f2521173 359 /**
fblanc 0:5d39f2521173 360 * @brief read write onewire
fblanc 0:5d39f2521173 361 * @param [in/out] b data
fblanc 0:5d39f2521173 362 * @return data
fblanc 0:5d39f2521173 363 * @date 20/06/2011
fblanc 0:5d39f2521173 364 */
fblanc 0:5d39f2521173 365 uint8_t ow_bit_io( uint8_t b ) {
fblanc 0:5d39f2521173 366
fblanc 0:5d39f2521173 367 ow_pin.output(); // drive bus low
fblanc 0:5d39f2521173 368 ow_pin = 0;
fblanc 0:5d39f2521173 369 wait_us(1); // Recovery-Time wuffwuff was 1
fblanc 0:5d39f2521173 370
fblanc 0:5d39f2521173 371 if ( b )
fblanc 0:5d39f2521173 372 ow_pin.input(); // if bit is 1 set bus high (by ext. pull-up)
fblanc 0:5d39f2521173 373 // delay was 15uS-1 see comment above
fblanc 0:5d39f2521173 374 wait_us(15-1);
fblanc 0:5d39f2521173 375 if ( ow_pin == 0 ) b = 0; // sample at end of read-timeslot
fblanc 0:5d39f2521173 376 wait_us(60-15);
fblanc 0:5d39f2521173 377 ow_pin.input();
fblanc 0:5d39f2521173 378 return b;
fblanc 0:5d39f2521173 379 }
fblanc 0:5d39f2521173 380 /**
fblanc 0:5d39f2521173 381 * @brief read write onewire
fblanc 0:5d39f2521173 382 * @param [in] n num bus onewire
fblanc 0:5d39f2521173 383 * @param [in/out] b data
fblanc 0:5d39f2521173 384 * @return data
fblanc 0:5d39f2521173 385 * @date 30/08/2011
fblanc 0:5d39f2521173 386 */
fblanc 0:5d39f2521173 387 uint8_t ow_bit_io(uint8_t n, uint8_t b ) {
fblanc 0:5d39f2521173 388
fblanc 0:5d39f2521173 389 t_ow[n]->output(); // drive bus low
fblanc 0:5d39f2521173 390 *t_ow[n] = 0;
fblanc 0:5d39f2521173 391 wait_us(1); // Recovery-Time wuffwuff was 1
fblanc 0:5d39f2521173 392
fblanc 0:5d39f2521173 393 if ( b )
fblanc 0:5d39f2521173 394 t_ow[n]->input(); // if bit is 1 set bus high (by ext. pull-up)
fblanc 0:5d39f2521173 395 // delay was 15uS-1 see comment above
fblanc 0:5d39f2521173 396 wait_us(15-1);
fblanc 0:5d39f2521173 397 if ( *t_ow[n] == 0 ) b = 0; // sample at end of read-timeslot
fblanc 0:5d39f2521173 398 wait_us(60-15);
fblanc 0:5d39f2521173 399 t_ow[n]->input();
fblanc 0:5d39f2521173 400 // printf("ow_bit_io n=%d b=%X\n",n,b);
fblanc 0:5d39f2521173 401 return b;
fblanc 0:5d39f2521173 402 }
fblanc 0:5d39f2521173 403 //**********************************************************************************************************
fblanc 0:5d39f2521173 404 //* byte write on onewire
fblanc 0:5d39f2521173 405 //**********************************************************************************************************
fblanc 0:5d39f2521173 406 /**
fblanc 0:5d39f2521173 407 * @brief byte write on onewire
fblanc 0:5d39f2521173 408 * @param [in] b data
fblanc 0:5d39f2521173 409 * @return data
fblanc 0:5d39f2521173 410 * @date 20/06/2011
fblanc 0:5d39f2521173 411 */
fblanc 0:5d39f2521173 412 uint8_t ow_byte_wr( uint8_t b ) {
fblanc 0:5d39f2521173 413 uint8_t i = 8, j;
fblanc 0:5d39f2521173 414
fblanc 0:5d39f2521173 415 do {
fblanc 0:5d39f2521173 416 j = ow_bit_io( b & 1 );
fblanc 0:5d39f2521173 417 b >>= 1;
fblanc 0:5d39f2521173 418 if ( j )
fblanc 0:5d39f2521173 419 b |= 0x80;
fblanc 0:5d39f2521173 420 } while ( --i );
fblanc 0:5d39f2521173 421 return b;
fblanc 0:5d39f2521173 422 }
fblanc 0:5d39f2521173 423 /**
fblanc 0:5d39f2521173 424 * @brief byte write on onewire
fblanc 0:5d39f2521173 425 * @param [in] n num bus onewire
fblanc 0:5d39f2521173 426 * @param [in] b data
fblanc 0:5d39f2521173 427 * @return data
fblanc 0:5d39f2521173 428 * @date 30/08/2011
fblanc 0:5d39f2521173 429 */
fblanc 0:5d39f2521173 430 uint8_t ow_byte_wr(uint8_t n, uint8_t b ) {
fblanc 0:5d39f2521173 431 uint8_t i = 8, j;
fblanc 0:5d39f2521173 432
fblanc 0:5d39f2521173 433 do {
fblanc 0:5d39f2521173 434 j = ow_bit_io(n, b & 1 );
fblanc 0:5d39f2521173 435 b >>= 1;
fblanc 0:5d39f2521173 436 if ( j )
fblanc 0:5d39f2521173 437 b |= 0x80;
fblanc 0:5d39f2521173 438 } while ( --i );
fblanc 0:5d39f2521173 439 return b;
fblanc 0:5d39f2521173 440 }
fblanc 0:5d39f2521173 441 //**********************************************************************************************************
fblanc 0:5d39f2521173 442 //* byte write on onewire
fblanc 0:5d39f2521173 443 //**********************************************************************************************************
fblanc 0:5d39f2521173 444 /**
fblanc 0:5d39f2521173 445 * @brief byte read on onewire
fblanc 0:5d39f2521173 446 * @return data
fblanc 0:5d39f2521173 447 * @date 20/06/2011
fblanc 0:5d39f2521173 448 */
fblanc 0:5d39f2521173 449 uint8_t ow_byte_rd( void ) {
fblanc 0:5d39f2521173 450 // read by sending 0xff (a dontcare?)
fblanc 0:5d39f2521173 451 return ow_byte_wr( 0xFF );
fblanc 0:5d39f2521173 452 }
fblanc 0:5d39f2521173 453
fblanc 0:5d39f2521173 454 /**
fblanc 0:5d39f2521173 455 * @brief byte read on onewire
fblanc 0:5d39f2521173 456 * @param [in] n num onewire
fblanc 0:5d39f2521173 457 * @return data
fblanc 0:5d39f2521173 458 * @date 30/08/2011
fblanc 0:5d39f2521173 459 */
fblanc 0:5d39f2521173 460 uint8_t ow_byte_rd( uint8_t n) {
fblanc 0:5d39f2521173 461 // read by sending 0xff (a dontcare?)
fblanc 0:5d39f2521173 462 return ow_byte_wr(n, 0xFF );
fblanc 0:5d39f2521173 463 }
fblanc 0:5d39f2521173 464 //**********************************************************************************************************
fblanc 0:5d39f2521173 465 //* byte write on onewire
fblanc 0:5d39f2521173 466 //**********************************************************************************************************
fblanc 0:5d39f2521173 467 /**
fblanc 0:5d39f2521173 468 * @brief write command
fblanc 0:5d39f2521173 469 * @param [in] command
fblanc 0:5d39f2521173 470 * @param [in] id romcode
fblanc 0:5d39f2521173 471 * @date 20/06/2011
fblanc 0:5d39f2521173 472 */
fblanc 0:5d39f2521173 473 uint8_t ow_command( uint8_t command, uint8_t id[] ) {
fblanc 0:5d39f2521173 474 uint8_t i;
fblanc 0:5d39f2521173 475
fblanc 0:5d39f2521173 476 ow_reset();
fblanc 0:5d39f2521173 477 if ( id ) {
fblanc 0:5d39f2521173 478 ow_byte_wr( OW_MATCH_ROM ); // to a single device
fblanc 0:5d39f2521173 479 i = OW_ROMCODE_SIZE;
fblanc 0:5d39f2521173 480 do {
fblanc 0:5d39f2521173 481 ow_byte_wr( *id );
fblanc 0:5d39f2521173 482 ++id;
fblanc 0:5d39f2521173 483 } while ( --i );
fblanc 0:5d39f2521173 484 } else {
fblanc 0:5d39f2521173 485 ow_byte_wr( OW_SKIP_ROM ); // to all devices
fblanc 0:5d39f2521173 486 }
fblanc 0:5d39f2521173 487 ow_byte_wr( command );
fblanc 0:5d39f2521173 488 return 0;
fblanc 0:5d39f2521173 489 }
fblanc 0:5d39f2521173 490 /**
fblanc 0:5d39f2521173 491 * @brief write command
fblanc 0:5d39f2521173 492 * @param [in] n num bus onewire
fblanc 0:5d39f2521173 493 * @param [in] command
fblanc 0:5d39f2521173 494 * @param [in] id romcode
fblanc 0:5d39f2521173 495 * @date 30/08/2011
fblanc 0:5d39f2521173 496 */
fblanc 0:5d39f2521173 497 uint8_t ow_command(uint8_t n, uint8_t command, uint8_t id[] ) {
fblanc 0:5d39f2521173 498 uint8_t i;
fblanc 0:5d39f2521173 499
fblanc 0:5d39f2521173 500 ow_reset(n);
fblanc 0:5d39f2521173 501 if ( id ) {
fblanc 0:5d39f2521173 502 ow_byte_wr( n,OW_MATCH_ROM ); // to a single device
fblanc 0:5d39f2521173 503 i = OW_ROMCODE_SIZE;
fblanc 0:5d39f2521173 504 do {
fblanc 0:5d39f2521173 505 ow_byte_wr(n, *id );
fblanc 0:5d39f2521173 506 ++id;
fblanc 0:5d39f2521173 507 } while ( --i );
fblanc 0:5d39f2521173 508 } else {
fblanc 0:5d39f2521173 509 ow_byte_wr(n, OW_SKIP_ROM ); // to all devices
fblanc 0:5d39f2521173 510 }
fblanc 0:5d39f2521173 511 ow_byte_wr(n, command );
fblanc 0:5d39f2521173 512 return 0;
fblanc 0:5d39f2521173 513 }
fblanc 0:5d39f2521173 514 //**********************************************************************************************************
fblanc 0:5d39f2521173 515 //* ow mode
fblanc 0:5d39f2521173 516 //**********************************************************************************************************
fblanc 0:5d39f2521173 517 /**
fblanc 0:5d39f2521173 518 * @brief parasite enable
fblanc 0:5d39f2521173 519 * @date 20/06/2011
fblanc 0:5d39f2521173 520 */
fblanc 0:5d39f2521173 521 uint8_t ow_parasite_enable(void) {
fblanc 0:5d39f2521173 522 ow_pin.output();
fblanc 0:5d39f2521173 523 ow_pin = 1;
fblanc 0:5d39f2521173 524 return 0;
fblanc 0:5d39f2521173 525 }
fblanc 0:5d39f2521173 526 /**
fblanc 0:5d39f2521173 527 * @brief parasite disable
fblanc 0:5d39f2521173 528 * @date 20/06/2011
fblanc 0:5d39f2521173 529 */
fblanc 0:5d39f2521173 530 uint8_t ow_parasite_disable(void) {
fblanc 0:5d39f2521173 531
fblanc 0:5d39f2521173 532 ow_pin.input();
fblanc 0:5d39f2521173 533 return 0;
fblanc 0:5d39f2521173 534 }
fblanc 0:5d39f2521173 535
fblanc 0:5d39f2521173 536 /**
fblanc 0:5d39f2521173 537 * @brief parasite enable
fblanc 0:5d39f2521173 538 * @param [in] n num bus onewire
fblanc 0:5d39f2521173 539 * @date 30/08/2011
fblanc 0:5d39f2521173 540 */
fblanc 0:5d39f2521173 541 uint8_t ow_parasite_enable(uint8_t n) {
fblanc 0:5d39f2521173 542 t_ow[n]->output();
fblanc 0:5d39f2521173 543 *t_ow[n] = 1;
fblanc 0:5d39f2521173 544 return 0;
fblanc 0:5d39f2521173 545 }
fblanc 0:5d39f2521173 546 /**
fblanc 0:5d39f2521173 547 * @brief parasite disable
fblanc 0:5d39f2521173 548 * @param [in] n num bus onewire
fblanc 0:5d39f2521173 549 * @date 30/08/2011
fblanc 0:5d39f2521173 550 */
fblanc 0:5d39f2521173 551 uint8_t ow_parasite_disable(uint8_t n) {
fblanc 0:5d39f2521173 552 t_ow[n]->input();
fblanc 0:5d39f2521173 553 return 0;
fblanc 0:5d39f2521173 554 }
fblanc 0:5d39f2521173 555 /**
fblanc 0:5d39f2521173 556 * @brief PUL-UP bus OW
fblanc 0:5d39f2521173 557 * @return OW_OK
fblanc 0:5d39f2521173 558 * @date 20/06/2011
fblanc 0:5d39f2521173 559 */
fblanc 0:5d39f2521173 560 uint8_t ow_PullUp(void)
fblanc 0:5d39f2521173 561 {
fblanc 0:5d39f2521173 562 ow_pin.mode(PullUp); //PULL-UP bus OW
fblanc 0:5d39f2521173 563 return OW_OK;
fblanc 0:5d39f2521173 564 }
fblanc 0:5d39f2521173 565 /**
fblanc 0:5d39f2521173 566 * @brief PUL-UP bus OW
fblanc 0:5d39f2521173 567 * @param [in] n num bus onewire
fblanc 0:5d39f2521173 568 * @return OW_OK
fblanc 0:5d39f2521173 569 * @date 30/08/2011
fblanc 0:5d39f2521173 570 */
fblanc 0:5d39f2521173 571 uint8_t ow_PullUp(uint8_t n)
fblanc 0:5d39f2521173 572 {
fblanc 0:5d39f2521173 573 t_ow[n]->mode(PullUp); //PULL-UP bus OW
fblanc 0:5d39f2521173 574 return OW_OK;
fblanc 0:5d39f2521173 575 }