Ivan Kravets / OneWire

OneWire Library lets you access 1-wire devices made by Maxim/Dallas, such as temperature sensors

Dependents:   OneWireTest mbed_blinky Affich_Lum_Moist Projetv0 ... more 

#include "mbed.h"
#include "OneWire.h"

OneWire owBus(p21);

int main()
{
    char _id[16];
    DeviceAddresses* devAddresses = owBus.getFoundDevAddresses();
    uint8_t foundNum = owBus.getFoundDevNum();
    printf("OneWire: found %d devices\r\n", foundNum);

    while(1) {
        OneWireDeviceTemperature::startConversationForAll(&owBus, OWTEMP_11_BIT);
        for (uint8_t i = 0; i < foundNum; i++) {
            OneWireDevice* owDevice = OneWireDeviceFactory::init(&owBus, (*devAddresses)[i]);
            
            if (owDevice->getFamily() != ONEWIRE_DS18B20_FAMILY)    // currently only DS18B20 supports
                continue;

            owDevice->generateId(_id);
            printf("OneWire: device #%s = %.4f*C\r\n", _id, (float) owDevice->sendGetCommand(GET_TEMPERATURE));
            delete owDevice;            
        }
        
        wait(5);
    }
 }

OneWire.cpp@1:74dcd0c7d5d4, 2012-12-17 (annotated)

Committer:
ivank
Date:
Mon Dec 17 13:34:57 2012 +0000
Revision:
1:74dcd0c7d5d4
Parent:
0:b9cd1d4dcc1f
Child:
2:07da4deb7135
- fixed bug with 1-Wire (added disablinginterripts)

Who changed what in which revision?

UserRevisionLine numberNew contents of line
ivank 1:74dcd0c7d5d4 1 /* Copyright (c) 2012, Ivan Kravets <me@ikravets.com>, www.ikravets.com. MIT License
ivank 1:74dcd0c7d5d4 2 *
ivank 1:74dcd0c7d5d4 3 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
ivank 1:74dcd0c7d5d4 4 * and associated documentation files (the "Software"), to deal in the Software without restriction,
ivank 1:74dcd0c7d5d4 5 * including without limitation the rights to use, copy, modify, merge, publish, distribute,
ivank 1:74dcd0c7d5d4 6 * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
ivank 1:74dcd0c7d5d4 7 * furnished to do so, subject to the following conditions:
ivank 1:74dcd0c7d5d4 8 *
ivank 1:74dcd0c7d5d4 9 * The above copyright notice and this permission notice shall be included in all copies or
ivank 1:74dcd0c7d5d4 10 * substantial portions of the Software.
ivank 1:74dcd0c7d5d4 11 *
ivank 1:74dcd0c7d5d4 12 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
ivank 1:74dcd0c7d5d4 13 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
ivank 1:74dcd0c7d5d4 14 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
ivank 1:74dcd0c7d5d4 15 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
ivank 1:74dcd0c7d5d4 16 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
ivank 1:74dcd0c7d5d4 17 */
ivank 1:74dcd0c7d5d4 18
ivank 1:74dcd0c7d5d4 19 #include "OneWire.h"
ivank 1:74dcd0c7d5d4 20 #include "ds18b20.h"
ivank 1:74dcd0c7d5d4 21
ivank 1:74dcd0c7d5d4 22 uint8_t const OneWire::dscrc_table[] = {
ivank 1:74dcd0c7d5d4 23 0, 94,188,226, 97, 63,221,131,194,156,126, 32,163,253, 31, 65,
ivank 1:74dcd0c7d5d4 24 157,195, 33,127,252,162, 64, 30, 95, 1,227,189, 62, 96,130,220,
ivank 1:74dcd0c7d5d4 25 35,125,159,193, 66, 28,254,160,225,191, 93, 3,128,222, 60, 98,
ivank 1:74dcd0c7d5d4 26 190,224, 2, 92,223,129, 99, 61,124, 34,192,158, 29, 67,161,255,
ivank 1:74dcd0c7d5d4 27 70, 24,250,164, 39,121,155,197,132,218, 56,102,229,187, 89, 7,
ivank 1:74dcd0c7d5d4 28 219,133,103, 57,186,228, 6, 88, 25, 71,165,251,120, 38,196,154,
ivank 1:74dcd0c7d5d4 29 101, 59,217,135, 4, 90,184,230,167,249, 27, 69,198,152,122, 36,
ivank 1:74dcd0c7d5d4 30 248,166, 68, 26,153,199, 37,123, 58,100,134,216, 91, 5,231,185,
ivank 1:74dcd0c7d5d4 31 140,210, 48,110,237,179, 81, 15, 78, 16,242,172, 47,113,147,205,
ivank 1:74dcd0c7d5d4 32 17, 79,173,243,112, 46,204,146,211,141,111, 49,178,236, 14, 80,
ivank 1:74dcd0c7d5d4 33 175,241, 19, 77,206,144,114, 44,109, 51,209,143, 12, 82,176,238,
ivank 1:74dcd0c7d5d4 34 50,108,142,208, 83, 13,239,177,240,174, 76, 18,145,207, 45,115,
ivank 1:74dcd0c7d5d4 35 202,148,118, 40,171,245, 23, 73, 8, 86,180,234,105, 55,213,139,
ivank 1:74dcd0c7d5d4 36 87, 9,235,181, 54,104,138,212,149,203, 41,119,244,170, 72, 22,
ivank 1:74dcd0c7d5d4 37 233,183, 85, 11,136,214, 52,106, 43,117,151,201, 74, 20,246,168,
ivank 1:74dcd0c7d5d4 38 116, 42,200,150, 21, 75,169,247,182,232, 10, 84,215,137,107, 53
ivank 1:74dcd0c7d5d4 39 };
ivank 1:74dcd0c7d5d4 40
ivank 1:74dcd0c7d5d4 41 OneWire::OneWire(PinName pin) : DIO(pin)
ivank 1:74dcd0c7d5d4 42 {
ivank 1:74dcd0c7d5d4 43 DIO.output();
ivank 1:74dcd0c7d5d4 44 DIO = 0;
ivank 1:74dcd0c7d5d4 45 DIO.input();
ivank 1:74dcd0c7d5d4 46
ivank 1:74dcd0c7d5d4 47 reset();
ivank 1:74dcd0c7d5d4 48 findDevAddresses();
ivank 1:74dcd0c7d5d4 49 }
ivank 1:74dcd0c7d5d4 50
ivank 1:74dcd0c7d5d4 51
ivank 1:74dcd0c7d5d4 52 uint8_t OneWire::reset(void)
ivank 1:74dcd0c7d5d4 53 {
ivank 1:74dcd0c7d5d4 54 uint8_t presence;
ivank 1:74dcd0c7d5d4 55 DIO.output();
ivank 1:74dcd0c7d5d4 56 DIO = 0;
ivank 1:74dcd0c7d5d4 57 wait_us(480);
ivank 1:74dcd0c7d5d4 58 DIO.input();
ivank 1:74dcd0c7d5d4 59 wait_us(70);
ivank 1:74dcd0c7d5d4 60 presence = DIO;
ivank 1:74dcd0c7d5d4 61 wait_us(410);
ivank 1:74dcd0c7d5d4 62 return(presence);
ivank 1:74dcd0c7d5d4 63 }
ivank 1:74dcd0c7d5d4 64
ivank 1:74dcd0c7d5d4 65 uint8_t OneWire::readBit(void)
ivank 1:74dcd0c7d5d4 66 {
ivank 1:74dcd0c7d5d4 67 uint8_t retval;
ivank 1:74dcd0c7d5d4 68 wait_us(1);
ivank 1:74dcd0c7d5d4 69 DIO.output();
ivank 1:74dcd0c7d5d4 70 DIO = 0;
ivank 1:74dcd0c7d5d4 71 wait_us(2);
ivank 1:74dcd0c7d5d4 72 DIO.input();
ivank 1:74dcd0c7d5d4 73 wait_us(10);
ivank 1:74dcd0c7d5d4 74 retval=DIO;
ivank 1:74dcd0c7d5d4 75 wait_us(48);
ivank 1:74dcd0c7d5d4 76 return(retval);
ivank 1:74dcd0c7d5d4 77 }
ivank 1:74dcd0c7d5d4 78
ivank 1:74dcd0c7d5d4 79 uint8_t OneWire::readByte(void)
ivank 1:74dcd0c7d5d4 80 {
ivank 1:74dcd0c7d5d4 81 uint8_t i, value=0;
ivank 1:74dcd0c7d5d4 82 for (i=0; i<8; i++) {
ivank 1:74dcd0c7d5d4 83 if (readBit()) value|=0x01<<i;
ivank 1:74dcd0c7d5d4 84 }
ivank 1:74dcd0c7d5d4 85 return(value);
ivank 1:74dcd0c7d5d4 86 }
ivank 1:74dcd0c7d5d4 87
ivank 1:74dcd0c7d5d4 88
ivank 1:74dcd0c7d5d4 89 void OneWire::writeBit(uint8_t bitval)
ivank 1:74dcd0c7d5d4 90 {
ivank 1:74dcd0c7d5d4 91 wait_us(1);
ivank 1:74dcd0c7d5d4 92 DIO.output();
ivank 1:74dcd0c7d5d4 93 DIO = 0;
ivank 1:74dcd0c7d5d4 94 wait_us(10);
ivank 1:74dcd0c7d5d4 95 if (bitval==1) DIO = 1;
ivank 1:74dcd0c7d5d4 96 wait_us(50);
ivank 1:74dcd0c7d5d4 97 DIO.input();
ivank 1:74dcd0c7d5d4 98 }
ivank 1:74dcd0c7d5d4 99
ivank 1:74dcd0c7d5d4 100
ivank 1:74dcd0c7d5d4 101 void OneWire::writeByte(uint8_t val)
ivank 1:74dcd0c7d5d4 102 {
ivank 1:74dcd0c7d5d4 103 uint8_t i;
ivank 1:74dcd0c7d5d4 104 uint8_t temp;
ivank 1:74dcd0c7d5d4 105 for (i=0; i<8; i++) {
ivank 1:74dcd0c7d5d4 106 temp = val>>i;
ivank 1:74dcd0c7d5d4 107 temp &= 0x01;
ivank 1:74dcd0c7d5d4 108 writeBit(temp);
ivank 1:74dcd0c7d5d4 109 }
ivank 1:74dcd0c7d5d4 110 }
ivank 1:74dcd0c7d5d4 111
ivank 1:74dcd0c7d5d4 112 uint8_t OneWire::calcCRC( uint8_t x)
ivank 1:74dcd0c7d5d4 113 {
ivank 1:74dcd0c7d5d4 114 return dscrc_table[dowcrc^x];
ivank 1:74dcd0c7d5d4 115 }
ivank 1:74dcd0c7d5d4 116
ivank 1:74dcd0c7d5d4 117 void OneWire::skip()
ivank 1:74dcd0c7d5d4 118 {
ivank 1:74dcd0c7d5d4 119 writeByte(0xcc);
ivank 1:74dcd0c7d5d4 120 }
ivank 1:74dcd0c7d5d4 121
ivank 1:74dcd0c7d5d4 122
ivank 1:74dcd0c7d5d4 123 void OneWire::select(uint8_t* devAddr)
ivank 1:74dcd0c7d5d4 124 {
ivank 1:74dcd0c7d5d4 125 writeByte(0x55);
ivank 1:74dcd0c7d5d4 126 for (uint8_t i=0; i<8; i++) {
ivank 1:74dcd0c7d5d4 127 writeByte(devAddr[i]);
ivank 1:74dcd0c7d5d4 128 }
ivank 1:74dcd0c7d5d4 129 }
ivank 1:74dcd0c7d5d4 130
ivank 1:74dcd0c7d5d4 131 void OneWire::sendGlobalCommand(uint8_t cmd)
ivank 1:74dcd0c7d5d4 132 {
ivank 1:74dcd0c7d5d4 133 reset();
ivank 1:74dcd0c7d5d4 134 skip();
ivank 1:74dcd0c7d5d4 135 writeByte(cmd);
ivank 1:74dcd0c7d5d4 136 }
ivank 1:74dcd0c7d5d4 137
ivank 1:74dcd0c7d5d4 138
ivank 1:74dcd0c7d5d4 139 void OneWire::resetSearch(void)
ivank 1:74dcd0c7d5d4 140 {
ivank 1:74dcd0c7d5d4 141 lastDiscrep = 0;
ivank 1:74dcd0c7d5d4 142 doneFlag = FALSE;
ivank 1:74dcd0c7d5d4 143 }
ivank 1:74dcd0c7d5d4 144
ivank 1:74dcd0c7d5d4 145 uint8_t OneWire::search(uint8_t* devAddr)
ivank 1:74dcd0c7d5d4 146 {
ivank 1:74dcd0c7d5d4 147 uint8_t m = 1; // ROM Bit index
ivank 1:74dcd0c7d5d4 148 uint8_t n = 0; // ROM Byte index
ivank 1:74dcd0c7d5d4 149 uint8_t k = 1; // bit mask
ivank 1:74dcd0c7d5d4 150 uint8_t x = 0;
ivank 1:74dcd0c7d5d4 151 uint8_t discrepMarker = 0; // discrepancy marker
ivank 1:74dcd0c7d5d4 152 uint8_t g; // Output bit
ivank 1:74dcd0c7d5d4 153 uint8_t nxt; // return value
ivank 1:74dcd0c7d5d4 154 uint8_t flag;
ivank 1:74dcd0c7d5d4 155 nxt = FALSE; // set the next flag to false
ivank 1:74dcd0c7d5d4 156 dowcrc = 0; // reset the dowcrc
ivank 1:74dcd0c7d5d4 157 DeviceAddress ROM;
ivank 1:74dcd0c7d5d4 158
ivank 1:74dcd0c7d5d4 159 flag = reset(); // reset the 1-Wire
ivank 1:74dcd0c7d5d4 160 if (flag||doneFlag) { // no parts -> return false
ivank 1:74dcd0c7d5d4 161 lastDiscrep = 0; // reset the search
ivank 1:74dcd0c7d5d4 162 return FALSE;
ivank 1:74dcd0c7d5d4 163 }
ivank 1:74dcd0c7d5d4 164
ivank 1:74dcd0c7d5d4 165 writeByte(0xF0); // send SearchROM command
ivank 1:74dcd0c7d5d4 166 do { // for all eight bytes
ivank 1:74dcd0c7d5d4 167 x = 0;
ivank 1:74dcd0c7d5d4 168 if (readBit()==1) x = 2;
ivank 1:74dcd0c7d5d4 169 wait_us(120);
ivank 1:74dcd0c7d5d4 170 if (readBit()==1) x |= 1; // and its complement
ivank 1:74dcd0c7d5d4 171 if (x ==3) // there are no devices on the 1-Wire
ivank 1:74dcd0c7d5d4 172 break;
ivank 1:74dcd0c7d5d4 173 else {
ivank 1:74dcd0c7d5d4 174 if (x>0) // all devices coupled have 0 or 1
ivank 1:74dcd0c7d5d4 175 g = x>>1; // bit write value for search
ivank 1:74dcd0c7d5d4 176 else {
ivank 1:74dcd0c7d5d4 177 // if this discrepancy is before the last discrepancy on a previous Next then pick the same as last time
ivank 1:74dcd0c7d5d4 178 if (m<lastDiscrep)
ivank 1:74dcd0c7d5d4 179 g = ((ROM[n]&k)>0);
ivank 1:74dcd0c7d5d4 180 else // if equal to last pick 1
ivank 1:74dcd0c7d5d4 181 g = (m==lastDiscrep); // if not then pick 0
ivank 1:74dcd0c7d5d4 182 // if 0 was picked then record position with mask k
ivank 1:74dcd0c7d5d4 183 if (g==0) discrepMarker = m;
ivank 1:74dcd0c7d5d4 184 }
ivank 1:74dcd0c7d5d4 185 if (g==1) // isolate bit in ROM[n] with mask k
ivank 1:74dcd0c7d5d4 186 ROM[n] |= k;
ivank 1:74dcd0c7d5d4 187 else
ivank 1:74dcd0c7d5d4 188 ROM[n] &= ~k;
ivank 1:74dcd0c7d5d4 189 writeBit(g); // ROM search write
ivank 1:74dcd0c7d5d4 190 m++; // increment bit counter m
ivank 1:74dcd0c7d5d4 191 k = k<<1; // and shift the bit mask k
ivank 1:74dcd0c7d5d4 192 if (k==0) { // if the mask is 0 then go to new ROM // byte n and reset mask
ivank 1:74dcd0c7d5d4 193 dowcrc = calcCRC(ROM[n]); // accumulate the CRC
ivank 1:74dcd0c7d5d4 194 n++;
ivank 1:74dcd0c7d5d4 195 k++;
ivank 1:74dcd0c7d5d4 196 }
ivank 1:74dcd0c7d5d4 197 }
ivank 1:74dcd0c7d5d4 198 } while (n<8); //loop until through all ROM bytes 0-7
ivank 1:74dcd0c7d5d4 199 if (m<65||dowcrc) // if search was unsuccessful then
ivank 1:74dcd0c7d5d4 200 lastDiscrep=0; // reset the last discrepancy to 0
ivank 1:74dcd0c7d5d4 201 else { // search was successful, so set lastDiscrep, lastOne, nxt
ivank 1:74dcd0c7d5d4 202 lastDiscrep = discrepMarker;
ivank 1:74dcd0c7d5d4 203 doneFlag = (lastDiscrep==0);
ivank 1:74dcd0c7d5d4 204 nxt = TRUE; // indicates search is not complete yet, more parts remain
ivank 1:74dcd0c7d5d4 205 }
ivank 1:74dcd0c7d5d4 206
ivank 1:74dcd0c7d5d4 207 for (uint8_t i = 0; i < 8; i++)
ivank 1:74dcd0c7d5d4 208 devAddr[i] = ROM[i];
ivank 1:74dcd0c7d5d4 209
ivank 1:74dcd0c7d5d4 210 return nxt;
ivank 1:74dcd0c7d5d4 211 }
ivank 1:74dcd0c7d5d4 212
ivank 1:74dcd0c7d5d4 213 void OneWire::findDevAddresses(void)
ivank 1:74dcd0c7d5d4 214 {
ivank 1:74dcd0c7d5d4 215 foundDevNum = 0;
ivank 1:74dcd0c7d5d4 216 resetSearch();
ivank 1:74dcd0c7d5d4 217
ivank 1:74dcd0c7d5d4 218 DeviceAddress devAddr;
ivank 1:74dcd0c7d5d4 219 while (search(devAddr)) {
ivank 1:74dcd0c7d5d4 220 foundDevNum++;
ivank 1:74dcd0c7d5d4 221 }
ivank 1:74dcd0c7d5d4 222 delete devAddr;
ivank 1:74dcd0c7d5d4 223
ivank 1:74dcd0c7d5d4 224 wait_us(250);
ivank 1:74dcd0c7d5d4 225 resetSearch();
ivank 1:74dcd0c7d5d4 226
ivank 1:74dcd0c7d5d4 227 foundDevAdresses = (DeviceAddresses*) malloc(foundDevNum * sizeof(int));
ivank 1:74dcd0c7d5d4 228 for (uint8_t i = 0; i < foundDevNum; i++) {
ivank 1:74dcd0c7d5d4 229 foundDevAdresses[i] = (DeviceAddress*) malloc(sizeof(DeviceAddress));
ivank 1:74dcd0c7d5d4 230 search((*foundDevAdresses)[i]);
ivank 1:74dcd0c7d5d4 231 }
ivank 1:74dcd0c7d5d4 232
ivank 1:74dcd0c7d5d4 233 printf("OneWire Bus: Found %d devices\r\n", getFoundDevNum() );
ivank 1:74dcd0c7d5d4 234 }
ivank 1:74dcd0c7d5d4 235
ivank 1:74dcd0c7d5d4 236 DeviceAddresses* OneWire::getFoundDevAddresses()
ivank 1:74dcd0c7d5d4 237 {
ivank 1:74dcd0c7d5d4 238 return foundDevAdresses;
ivank 1:74dcd0c7d5d4 239 }
ivank 1:74dcd0c7d5d4 240
ivank 1:74dcd0c7d5d4 241 uint8_t OneWire::getFoundDevNum()
ivank 1:74dcd0c7d5d4 242 {
ivank 1:74dcd0c7d5d4 243 return foundDevNum;
ivank 1:74dcd0c7d5d4 244 }
ivank 1:74dcd0c7d5d4 245
ivank 1:74dcd0c7d5d4 246
ivank 1:74dcd0c7d5d4 247
ivank 1:74dcd0c7d5d4 248 // ======================== OneWireDevice Class =============================
ivank 1:74dcd0c7d5d4 249 OneWireDevice* OneWireDeviceFactory::init(OneWire* ow, DeviceAddress address)
ivank 1:74dcd0c7d5d4 250 {
ivank 1:74dcd0c7d5d4 251 switch (address[0]) {
ivank 1:74dcd0c7d5d4 252 case ONEWIRE_DS18B20_FAMILY:
ivank 1:74dcd0c7d5d4 253 return new OneWireDeviceDS18B20(ow, address);
ivank 1:74dcd0c7d5d4 254 }
ivank 1:74dcd0c7d5d4 255
ivank 1:74dcd0c7d5d4 256 return NULL;
ivank 1:74dcd0c7d5d4 257 }
ivank 1:74dcd0c7d5d4 258
ivank 1:74dcd0c7d5d4 259 OneWireDevice::OneWireDevice(OneWire* ow, DeviceAddress devAddr)
ivank 1:74dcd0c7d5d4 260 {
ivank 1:74dcd0c7d5d4 261 owBus = ow;
ivank 1:74dcd0c7d5d4 262 for (uint8_t i = 0; i < 8; i++)
ivank 1:74dcd0c7d5d4 263 address[i] = devAddr[i];
ivank 1:74dcd0c7d5d4 264
ivank 1:74dcd0c7d5d4 265
ivank 1:74dcd0c7d5d4 266 }
ivank 1:74dcd0c7d5d4 267
ivank 1:74dcd0c7d5d4 268 void OneWireDevice::generateId(char* id)
ivank 1:74dcd0c7d5d4 269 {
ivank 1:74dcd0c7d5d4 270 sprintf(id, "%02X%02X%02X%02X%02X%02X%02X%02X", address[0], address[1],address[2],address[3],address[4],address[5],address[6],address[7]);
ivank 1:74dcd0c7d5d4 271 }
ivank 1:74dcd0c7d5d4 272
ivank 1:74dcd0c7d5d4 273 uint8_t OneWireDevice::getFamily()
ivank 1:74dcd0c7d5d4 274 {
ivank 1:74dcd0c7d5d4 275 return address[0];
ivank 1:74dcd0c7d5d4 276 }
ivank 1:74dcd0c7d5d4 277
ivank 1:74dcd0c7d5d4 278
ivank 1:74dcd0c7d5d4 279 void OneWireDeviceTemperature::startConversationForAll(OneWire* owBus, uint8_t resolution)
ivank 1:74dcd0c7d5d4 280 {
ivank 1:74dcd0c7d5d4 281 DeviceAddresses* devAddresses = owBus->getFoundDevAddresses();
ivank 1:74dcd0c7d5d4 282 for (uint8_t i = 0; i < owBus->getFoundDevNum(); i++) {
ivank 1:74dcd0c7d5d4 283 OneWireDevice* owDevice = OneWireDeviceFactory::init(owBus, (*devAddresses)[i]);
ivank 1:74dcd0c7d5d4 284 if (owDevice->getFamily() != ONEWIRE_DS18B20_FAMILY)
ivank 1:74dcd0c7d5d4 285 continue;
ivank 1:74dcd0c7d5d4 286
ivank 1:74dcd0c7d5d4 287 owDevice->sendSetCommand(SET_TEMPERATURE_RESOLUTION, resolution);
ivank 1:74dcd0c7d5d4 288 delete owDevice;
ivank 1:74dcd0c7d5d4 289 }
ivank 1:74dcd0c7d5d4 290 //delete devAddresses;
ivank 1:74dcd0c7d5d4 291
ivank 1:74dcd0c7d5d4 292 // owBus->sendGlobalCommand(0xcc); // Skip ROM command.
ivank 1:74dcd0c7d5d4 293 owBus->sendGlobalCommand(0x44);
ivank 1:74dcd0c7d5d4 294 // wait_us(750);
ivank 1:74dcd0c7d5d4 295
ivank 1:74dcd0c7d5d4 296 switch (resolution) {
ivank 1:74dcd0c7d5d4 297 case OWTEMP_9_BIT:
ivank 1:74dcd0c7d5d4 298 wait_us(94);
ivank 1:74dcd0c7d5d4 299 break;
ivank 1:74dcd0c7d5d4 300 case OWTEMP_10_BIT:
ivank 1:74dcd0c7d5d4 301 wait_us(188);
ivank 1:74dcd0c7d5d4 302 break;
ivank 1:74dcd0c7d5d4 303 case OWTEMP_11_BIT:
ivank 1:74dcd0c7d5d4 304 wait_us(375);
ivank 1:74dcd0c7d5d4 305 break;
ivank 1:74dcd0c7d5d4 306 case OWTEMP_12_BIT:
ivank 1:74dcd0c7d5d4 307 default:
ivank 1:74dcd0c7d5d4 308 wait_us(750);
ivank 1:74dcd0c7d5d4 309 break;
ivank 1:74dcd0c7d5d4 310 }
ivank 0:b9cd1d4dcc1f 311 };