1-Wire® library for mbed. Complete 1-Wire library that supports our silicon masters along with a bit-bang master on the MAX32600MBED platform with one common interface for mbed. Slave support has also been included and more slaves will be added as time permits.
Dependents: MAXREFDES131_Qt_Demo MAX32630FTHR_iButton_uSD_Logger MAX32630FTHR_DS18B20_uSD_Logger MAXREFDES130_131_Demo ... more
Superseded by MaximInterface.
OneWire_Masters/OneWireMaster.cpp@21:00c94aeb533e, 2016-03-21 (annotated)
- Committer:
- IanBenzMaxim
- Date:
- Mon Mar 21 14:12:28 2016 -0500
- Revision:
- 21:00c94aeb533e
- Parent:
- 17:b646b1e3970b
- Child:
- 23:e8e403d61359
Added class for DS2465. Added a ReadBytePower operation to OneWireMaster since this is required by the authenticators including the DS28E15. Tweaked member data of OneWireMaster. Added path to header file includes to reduce compiler setup required.
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
j3 | 5:ce108eeb878d | 1 | /******************************************************************//** |
j3 | 5:ce108eeb878d | 2 | * Copyright (C) 2016 Maxim Integrated Products, Inc., All Rights Reserved. |
j3 | 5:ce108eeb878d | 3 | * |
j3 | 5:ce108eeb878d | 4 | * Permission is hereby granted, free of charge, to any person obtaining a |
j3 | 5:ce108eeb878d | 5 | * copy of this software and associated documentation files (the "Software"), |
j3 | 5:ce108eeb878d | 6 | * to deal in the Software without restriction, including without limitation |
j3 | 5:ce108eeb878d | 7 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
j3 | 5:ce108eeb878d | 8 | * and/or sell copies of the Software, and to permit persons to whom the |
j3 | 5:ce108eeb878d | 9 | * Software is furnished to do so, subject to the following conditions: |
j3 | 5:ce108eeb878d | 10 | * |
j3 | 5:ce108eeb878d | 11 | * The above copyright notice and this permission notice shall be included |
j3 | 5:ce108eeb878d | 12 | * in all copies or substantial portions of the Software. |
j3 | 5:ce108eeb878d | 13 | * |
j3 | 5:ce108eeb878d | 14 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
j3 | 5:ce108eeb878d | 15 | * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
j3 | 5:ce108eeb878d | 16 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. |
j3 | 5:ce108eeb878d | 17 | * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES |
j3 | 5:ce108eeb878d | 18 | * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
j3 | 5:ce108eeb878d | 19 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
j3 | 5:ce108eeb878d | 20 | * OTHER DEALINGS IN THE SOFTWARE. |
j3 | 5:ce108eeb878d | 21 | * |
j3 | 5:ce108eeb878d | 22 | * Except as contained in this notice, the name of Maxim Integrated |
j3 | 5:ce108eeb878d | 23 | * Products, Inc. shall not be used except as stated in the Maxim Integrated |
j3 | 5:ce108eeb878d | 24 | * Products, Inc. Branding Policy. |
j3 | 5:ce108eeb878d | 25 | * |
j3 | 5:ce108eeb878d | 26 | * The mere transfer of this software does not imply any licenses |
j3 | 5:ce108eeb878d | 27 | * of trade secrets, proprietary technology, copyrights, patents, |
j3 | 5:ce108eeb878d | 28 | * trademarks, maskwork rights, or any other form of intellectual |
j3 | 5:ce108eeb878d | 29 | * property whatsoever. Maxim Integrated Products, Inc. retains all |
j3 | 5:ce108eeb878d | 30 | * ownership rights. |
j3 | 5:ce108eeb878d | 31 | **********************************************************************/ |
j3 | 5:ce108eeb878d | 32 | |
j3 | 5:ce108eeb878d | 33 | |
j3 | 15:f6cb0d906fb6 | 34 | #include "OneWireMaster.h" |
j3 | 15:f6cb0d906fb6 | 35 | |
j3 | 15:f6cb0d906fb6 | 36 | |
j3 | 17:b646b1e3970b | 37 | const uint16_t OneWireMaster::_oddparity[] = { 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0 }; |
j3 | 15:f6cb0d906fb6 | 38 | |
j3 | 15:f6cb0d906fb6 | 39 | |
j3 | 15:f6cb0d906fb6 | 40 | //********************************************************************* |
j3 | 17:b646b1e3970b | 41 | OneWireInterface::CmdResult OneWireMaster::OWWriteBit(uint8_t sendbit) |
j3 | 15:f6cb0d906fb6 | 42 | { |
j3 | 17:b646b1e3970b | 43 | return OWTouchBit(sendbit); |
j3 | 15:f6cb0d906fb6 | 44 | } |
j3 | 15:f6cb0d906fb6 | 45 | |
j3 | 15:f6cb0d906fb6 | 46 | |
j3 | 15:f6cb0d906fb6 | 47 | //********************************************************************* |
j3 | 17:b646b1e3970b | 48 | OneWireInterface::CmdResult OneWireMaster::OWReadBit(uint8_t & recvbit) |
j3 | 15:f6cb0d906fb6 | 49 | { |
j3 | 17:b646b1e3970b | 50 | recvbit = 0x01; |
j3 | 17:b646b1e3970b | 51 | return(OWTouchBit(recvbit)); |
j3 | 15:f6cb0d906fb6 | 52 | } |
j3 | 15:f6cb0d906fb6 | 53 | |
j3 | 15:f6cb0d906fb6 | 54 | |
j3 | 15:f6cb0d906fb6 | 55 | //********************************************************************* |
j3 | 17:b646b1e3970b | 56 | OneWireInterface::CmdResult OneWireMaster::OWTouchByte(uint8_t & sendrecvbyte) |
j3 | 15:f6cb0d906fb6 | 57 | { |
j3 | 17:b646b1e3970b | 58 | OneWireInterface::CmdResult result = OWWriteByte(sendrecvbyte); |
j3 | 17:b646b1e3970b | 59 | |
j3 | 17:b646b1e3970b | 60 | if (result == OneWireInterface::Success) |
j3 | 17:b646b1e3970b | 61 | { |
j3 | 17:b646b1e3970b | 62 | OWReadByte(sendrecvbyte); |
j3 | 17:b646b1e3970b | 63 | } |
j3 | 15:f6cb0d906fb6 | 64 | |
j3 | 17:b646b1e3970b | 65 | return result; |
j3 | 15:f6cb0d906fb6 | 66 | } |
j3 | 15:f6cb0d906fb6 | 67 | |
j3 | 15:f6cb0d906fb6 | 68 | |
j3 | 15:f6cb0d906fb6 | 69 | //********************************************************************* |
j3 | 17:b646b1e3970b | 70 | OneWireInterface::CmdResult OneWireMaster::OWBlock(uint8_t *tran_buf, uint8_t tran_len) |
j3 | 15:f6cb0d906fb6 | 71 | { |
j3 | 17:b646b1e3970b | 72 | OneWireInterface::CmdResult result; |
j3 | 15:f6cb0d906fb6 | 73 | |
j3 | 17:b646b1e3970b | 74 | for (uint8_t i = 0; i < tran_len; i++) |
j3 | 17:b646b1e3970b | 75 | { |
j3 | 17:b646b1e3970b | 76 | result = OWTouchByte(tran_buf[i]); |
j3 | 17:b646b1e3970b | 77 | |
j3 | 17:b646b1e3970b | 78 | if (result != OneWireInterface::Success) |
j3 | 17:b646b1e3970b | 79 | { |
j3 | 17:b646b1e3970b | 80 | break; |
j3 | 17:b646b1e3970b | 81 | } |
j3 | 17:b646b1e3970b | 82 | } |
j3 | 15:f6cb0d906fb6 | 83 | |
j3 | 17:b646b1e3970b | 84 | return result; |
j3 | 17:b646b1e3970b | 85 | } |
j3 | 17:b646b1e3970b | 86 | |
j3 | 17:b646b1e3970b | 87 | |
j3 | 17:b646b1e3970b | 88 | OneWireInterface::CmdResult OneWireMaster::OWFirst(RomId & romId) |
j3 | 15:f6cb0d906fb6 | 89 | { |
j3 | 17:b646b1e3970b | 90 | // reset the search state |
j3 | 17:b646b1e3970b | 91 | _last_discrepancy = 0; |
j3 | 17:b646b1e3970b | 92 | _last_device_flag = 0; |
j3 | 17:b646b1e3970b | 93 | _last_family_discrepancy = 0; |
j3 | 17:b646b1e3970b | 94 | |
j3 | 17:b646b1e3970b | 95 | return OWSearch(romId); |
j3 | 15:f6cb0d906fb6 | 96 | } |
j3 | 15:f6cb0d906fb6 | 97 | |
j3 | 15:f6cb0d906fb6 | 98 | |
j3 | 15:f6cb0d906fb6 | 99 | //********************************************************************* |
j3 | 17:b646b1e3970b | 100 | OneWireInterface::CmdResult OneWireMaster::OWNext(RomId & romId) |
j3 | 15:f6cb0d906fb6 | 101 | { |
j3 | 17:b646b1e3970b | 102 | // leave the search state alone |
j3 | 17:b646b1e3970b | 103 | return OWSearch(romId); |
j3 | 15:f6cb0d906fb6 | 104 | } |
j3 | 15:f6cb0d906fb6 | 105 | |
j3 | 15:f6cb0d906fb6 | 106 | |
j3 | 15:f6cb0d906fb6 | 107 | //********************************************************************* |
j3 | 17:b646b1e3970b | 108 | OneWireInterface::CmdResult OneWireMaster::OWVerify(const RomId & romId) |
j3 | 15:f6cb0d906fb6 | 109 | { |
j3 | 17:b646b1e3970b | 110 | OneWireInterface::CmdResult result; |
j3 | 17:b646b1e3970b | 111 | |
j3 | 17:b646b1e3970b | 112 | RomId romIdCopy(romId); |
j3 | 17:b646b1e3970b | 113 | |
j3 | 17:b646b1e3970b | 114 | int ld_backup, ldf_backup, lfd_backup; |
j3 | 15:f6cb0d906fb6 | 115 | |
j3 | 15:f6cb0d906fb6 | 116 | // keep a backup copy of the current state |
j3 | 15:f6cb0d906fb6 | 117 | ld_backup = _last_discrepancy; |
j3 | 15:f6cb0d906fb6 | 118 | ldf_backup = _last_device_flag; |
j3 | 15:f6cb0d906fb6 | 119 | lfd_backup = _last_family_discrepancy; |
j3 | 15:f6cb0d906fb6 | 120 | |
j3 | 15:f6cb0d906fb6 | 121 | // set search to find the same device |
j3 | 15:f6cb0d906fb6 | 122 | _last_discrepancy = 64; |
IanBenzMaxim | 21:00c94aeb533e | 123 | _last_device_flag = false; |
j3 | 15:f6cb0d906fb6 | 124 | |
j3 | 17:b646b1e3970b | 125 | result = OWSearch(romIdCopy); |
j3 | 17:b646b1e3970b | 126 | if (result == OneWireInterface::Success) |
j3 | 15:f6cb0d906fb6 | 127 | { |
j3 | 15:f6cb0d906fb6 | 128 | // check if same device found |
j3 | 17:b646b1e3970b | 129 | if (romId != romIdCopy) |
j3 | 15:f6cb0d906fb6 | 130 | { |
j3 | 17:b646b1e3970b | 131 | result = OneWireInterface::OperationFailure; |
j3 | 15:f6cb0d906fb6 | 132 | } |
j3 | 15:f6cb0d906fb6 | 133 | } |
j3 | 15:f6cb0d906fb6 | 134 | |
j3 | 15:f6cb0d906fb6 | 135 | // restore the search state |
j3 | 15:f6cb0d906fb6 | 136 | _last_discrepancy = ld_backup; |
j3 | 15:f6cb0d906fb6 | 137 | _last_device_flag = ldf_backup; |
j3 | 15:f6cb0d906fb6 | 138 | _last_family_discrepancy = lfd_backup; |
j3 | 17:b646b1e3970b | 139 | |
j3 | 15:f6cb0d906fb6 | 140 | // return the result of the verify |
j3 | 17:b646b1e3970b | 141 | return result; |
j3 | 15:f6cb0d906fb6 | 142 | } |
j3 | 15:f6cb0d906fb6 | 143 | |
j3 | 15:f6cb0d906fb6 | 144 | |
j3 | 15:f6cb0d906fb6 | 145 | //********************************************************************* |
j3 | 17:b646b1e3970b | 146 | void OneWireMaster::OWTargetSetup(RomId & romId) |
j3 | 15:f6cb0d906fb6 | 147 | { |
j3 | 15:f6cb0d906fb6 | 148 | // set the search state to find SearchFamily type devices |
j3 | 17:b646b1e3970b | 149 | for (int i = 1; i < 8; i++) |
j3 | 15:f6cb0d906fb6 | 150 | { |
j3 | 17:b646b1e3970b | 151 | romId[i] = 0; |
j3 | 15:f6cb0d906fb6 | 152 | } |
j3 | 15:f6cb0d906fb6 | 153 | |
j3 | 15:f6cb0d906fb6 | 154 | _last_discrepancy = 64; |
j3 | 15:f6cb0d906fb6 | 155 | _last_family_discrepancy = 0; |
j3 | 15:f6cb0d906fb6 | 156 | _last_device_flag = false; |
j3 | 15:f6cb0d906fb6 | 157 | } |
j3 | 5:ce108eeb878d | 158 | |
j3 | 5:ce108eeb878d | 159 | |
j3 | 5:ce108eeb878d | 160 | //********************************************************************* |
j3 | 15:f6cb0d906fb6 | 161 | void OneWireMaster::OWFamilySkipSetup(void) |
j3 | 15:f6cb0d906fb6 | 162 | { |
j3 | 15:f6cb0d906fb6 | 163 | // set the Last discrepancy to last family discrepancy |
j3 | 15:f6cb0d906fb6 | 164 | _last_discrepancy = _last_family_discrepancy; |
j3 | 17:b646b1e3970b | 165 | |
j3 | 15:f6cb0d906fb6 | 166 | // clear the last family discrpepancy |
j3 | 15:f6cb0d906fb6 | 167 | _last_family_discrepancy = 0; |
j3 | 17:b646b1e3970b | 168 | |
j3 | 15:f6cb0d906fb6 | 169 | // check for end of list |
j3 | 17:b646b1e3970b | 170 | if (_last_discrepancy == 0) |
j3 | 15:f6cb0d906fb6 | 171 | { |
j3 | 15:f6cb0d906fb6 | 172 | _last_device_flag = true; |
j3 | 15:f6cb0d906fb6 | 173 | } |
j3 | 15:f6cb0d906fb6 | 174 | } |
j3 | 15:f6cb0d906fb6 | 175 | |
j3 | 15:f6cb0d906fb6 | 176 | |
j3 | 15:f6cb0d906fb6 | 177 | //********************************************************************* |
j3 | 17:b646b1e3970b | 178 | OneWireInterface::CmdResult OneWireMaster::OWReadROM(RomId & romId) |
j3 | 15:f6cb0d906fb6 | 179 | { |
j3 | 17:b646b1e3970b | 180 | OneWireInterface::CmdResult result; |
j3 | 15:f6cb0d906fb6 | 181 | |
j3 | 17:b646b1e3970b | 182 | uint8_t buf[2 + RomId::byteLen]; |
j3 | 17:b646b1e3970b | 183 | |
j3 | 17:b646b1e3970b | 184 | result = OWReset(); |
j3 | 17:b646b1e3970b | 185 | if (result == OneWireInterface::Success) |
j3 | 15:f6cb0d906fb6 | 186 | { |
j3 | 17:b646b1e3970b | 187 | result = OWWriteByte(0x33); // READ ROM |
j3 | 17:b646b1e3970b | 188 | } |
j3 | 17:b646b1e3970b | 189 | |
j3 | 17:b646b1e3970b | 190 | // read the ROM |
j3 | 17:b646b1e3970b | 191 | if (result == OneWireInterface::Success) |
j3 | 17:b646b1e3970b | 192 | { |
j3 | 17:b646b1e3970b | 193 | result = OWReadBlock(buf, RomId::byteLen); |
j3 | 15:f6cb0d906fb6 | 194 | } |
j3 | 15:f6cb0d906fb6 | 195 | |
j3 | 17:b646b1e3970b | 196 | // verify CRC8 |
j3 | 17:b646b1e3970b | 197 | if ((result == OneWireInterface::Success) && romId.crc8Valid() && (buf[1] != 0)) |
j3 | 17:b646b1e3970b | 198 | { |
j3 | 17:b646b1e3970b | 199 | romId = RomId(reinterpret_cast<std::uint8_t (&)[RomId::byteLen]>(buf[0])); |
j3 | 17:b646b1e3970b | 200 | } |
j3 | 17:b646b1e3970b | 201 | |
j3 | 17:b646b1e3970b | 202 | return result; |
j3 | 15:f6cb0d906fb6 | 203 | } |
j3 | 15:f6cb0d906fb6 | 204 | |
j3 | 15:f6cb0d906fb6 | 205 | |
j3 | 15:f6cb0d906fb6 | 206 | //********************************************************************* |
j3 | 17:b646b1e3970b | 207 | OneWireInterface::CmdResult OneWireMaster::OWSkipROM(void) |
j3 | 15:f6cb0d906fb6 | 208 | { |
j3 | 17:b646b1e3970b | 209 | OneWireInterface::CmdResult result; |
j3 | 15:f6cb0d906fb6 | 210 | |
j3 | 17:b646b1e3970b | 211 | result = OWReset(); |
j3 | 17:b646b1e3970b | 212 | if (result == OneWireInterface::Success) |
j3 | 15:f6cb0d906fb6 | 213 | { |
j3 | 17:b646b1e3970b | 214 | result = OWWriteByte(0xCC); |
j3 | 15:f6cb0d906fb6 | 215 | } |
j3 | 15:f6cb0d906fb6 | 216 | |
j3 | 17:b646b1e3970b | 217 | return result; |
j3 | 15:f6cb0d906fb6 | 218 | } |
j3 | 15:f6cb0d906fb6 | 219 | |
j3 | 15:f6cb0d906fb6 | 220 | |
j3 | 15:f6cb0d906fb6 | 221 | //********************************************************************* |
j3 | 17:b646b1e3970b | 222 | OneWireInterface::CmdResult OneWireMaster::OWMatchROM(const RomId & romId) |
j3 | 15:f6cb0d906fb6 | 223 | { |
j3 | 17:b646b1e3970b | 224 | OneWireInterface::CmdResult result; |
j3 | 15:f6cb0d906fb6 | 225 | |
j3 | 17:b646b1e3970b | 226 | uint8_t buf[1 + RomId::byteLen]; |
j3 | 17:b646b1e3970b | 227 | |
j3 | 17:b646b1e3970b | 228 | // use MatchROM |
j3 | 17:b646b1e3970b | 229 | result = OWReset(); |
j3 | 17:b646b1e3970b | 230 | if (result == OneWireInterface::Success) |
j3 | 15:f6cb0d906fb6 | 231 | { |
j3 | 17:b646b1e3970b | 232 | buf[0] = 0x55; |
j3 | 17:b646b1e3970b | 233 | std::memcpy(&buf[1], romId, RomId::byteLen); |
j3 | 17:b646b1e3970b | 234 | // send command and rom |
j3 | 17:b646b1e3970b | 235 | result = OWWriteBlock(buf, 1 + RomId::byteLen); |
j3 | 15:f6cb0d906fb6 | 236 | } |
j3 | 17:b646b1e3970b | 237 | |
j3 | 17:b646b1e3970b | 238 | return result; |
j3 | 15:f6cb0d906fb6 | 239 | } |
j3 | 15:f6cb0d906fb6 | 240 | |
j3 | 15:f6cb0d906fb6 | 241 | |
j3 | 15:f6cb0d906fb6 | 242 | //********************************************************************* |
j3 | 17:b646b1e3970b | 243 | OneWireInterface::CmdResult OneWireMaster::OWOverdriveSkipROM(void) |
j3 | 15:f6cb0d906fb6 | 244 | { |
j3 | 17:b646b1e3970b | 245 | OneWireInterface::CmdResult result = OWSpeed(SPEED_STANDARD); |
j3 | 15:f6cb0d906fb6 | 246 | |
j3 | 17:b646b1e3970b | 247 | if (result == OneWireInterface::Success) |
j3 | 15:f6cb0d906fb6 | 248 | { |
j3 | 17:b646b1e3970b | 249 | result = OWReset(); |
j3 | 15:f6cb0d906fb6 | 250 | } |
j3 | 15:f6cb0d906fb6 | 251 | |
j3 | 17:b646b1e3970b | 252 | if (result == OneWireInterface::Success) |
j3 | 17:b646b1e3970b | 253 | { |
j3 | 17:b646b1e3970b | 254 | result = OWWriteByte(0x3C); |
j3 | 17:b646b1e3970b | 255 | } |
j3 | 17:b646b1e3970b | 256 | |
j3 | 17:b646b1e3970b | 257 | if (result == OneWireInterface::Success) |
j3 | 17:b646b1e3970b | 258 | { |
j3 | 17:b646b1e3970b | 259 | result = OWSpeed(SPEED_OVERDRIVE); |
j3 | 17:b646b1e3970b | 260 | } |
j3 | 17:b646b1e3970b | 261 | |
j3 | 17:b646b1e3970b | 262 | return result; |
j3 | 15:f6cb0d906fb6 | 263 | } |
j3 | 15:f6cb0d906fb6 | 264 | |
j3 | 15:f6cb0d906fb6 | 265 | |
j3 | 15:f6cb0d906fb6 | 266 | //********************************************************************* |
j3 | 17:b646b1e3970b | 267 | OneWireInterface::CmdResult OneWireMaster::OWOverdriveMatchROM(const RomId & romId) |
j3 | 15:f6cb0d906fb6 | 268 | { |
j3 | 17:b646b1e3970b | 269 | OneWireInterface::CmdResult result; |
j3 | 15:f6cb0d906fb6 | 270 | |
j3 | 17:b646b1e3970b | 271 | // use overdrive MatchROM |
j3 | 17:b646b1e3970b | 272 | OWSpeed(SPEED_STANDARD); |
j3 | 17:b646b1e3970b | 273 | |
j3 | 17:b646b1e3970b | 274 | result = OWReset(); |
j3 | 17:b646b1e3970b | 275 | if (result == OneWireInterface::Success) |
j3 | 15:f6cb0d906fb6 | 276 | { |
j3 | 17:b646b1e3970b | 277 | result = OWWriteByte(0x69); |
j3 | 17:b646b1e3970b | 278 | if (result == OneWireInterface::Success) |
j3 | 15:f6cb0d906fb6 | 279 | { |
j3 | 15:f6cb0d906fb6 | 280 | OWSpeed(SPEED_OVERDRIVE); |
j3 | 17:b646b1e3970b | 281 | // send ROM |
j3 | 17:b646b1e3970b | 282 | result = OWWriteBlock(romId, RomId::byteLen); |
j3 | 15:f6cb0d906fb6 | 283 | } |
j3 | 15:f6cb0d906fb6 | 284 | } |
j3 | 17:b646b1e3970b | 285 | return result; |
j3 | 15:f6cb0d906fb6 | 286 | } |
j3 | 15:f6cb0d906fb6 | 287 | |
j3 | 15:f6cb0d906fb6 | 288 | |
j3 | 15:f6cb0d906fb6 | 289 | //********************************************************************* |
j3 | 17:b646b1e3970b | 290 | OneWireInterface::CmdResult OneWireMaster::OWResume(void) |
j3 | 15:f6cb0d906fb6 | 291 | { |
j3 | 17:b646b1e3970b | 292 | OneWireInterface::CmdResult result; |
j3 | 15:f6cb0d906fb6 | 293 | |
j3 | 17:b646b1e3970b | 294 | result = OWReset(); |
j3 | 17:b646b1e3970b | 295 | if (result == OneWireInterface::Success) |
j3 | 15:f6cb0d906fb6 | 296 | { |
j3 | 17:b646b1e3970b | 297 | result = OWWriteByte(0xA5); |
j3 | 15:f6cb0d906fb6 | 298 | } |
j3 | 15:f6cb0d906fb6 | 299 | |
j3 | 17:b646b1e3970b | 300 | return result; |
j3 | 15:f6cb0d906fb6 | 301 | } |
j3 | 15:f6cb0d906fb6 | 302 | |
j3 | 15:f6cb0d906fb6 | 303 | |
j3 | 17:b646b1e3970b | 304 | //-------------------------------------------------------------------------- |
j3 | 17:b646b1e3970b | 305 | // Calculate a new CRC16 from the input data shorteger. Return the current |
j3 | 17:b646b1e3970b | 306 | // CRC16 and also update the global variable CRC16. |
j3 | 17:b646b1e3970b | 307 | // |
j3 | 17:b646b1e3970b | 308 | uint16_t OneWireMaster::calculateCRC16(uint16_t CRC16, uint16_t data) |
j3 | 15:f6cb0d906fb6 | 309 | { |
j3 | 17:b646b1e3970b | 310 | data = (data ^ (CRC16 & 0xff)) & 0xff; |
j3 | 17:b646b1e3970b | 311 | CRC16 >>= 8; |
j3 | 17:b646b1e3970b | 312 | |
j3 | 17:b646b1e3970b | 313 | if (_oddparity[data & 0xf] ^ _oddparity[data >> 4]) |
j3 | 17:b646b1e3970b | 314 | CRC16 ^= 0xc001; |
j3 | 17:b646b1e3970b | 315 | |
j3 | 17:b646b1e3970b | 316 | data <<= 6; |
j3 | 17:b646b1e3970b | 317 | CRC16 ^= data; |
j3 | 17:b646b1e3970b | 318 | data <<= 1; |
j3 | 17:b646b1e3970b | 319 | CRC16 ^= data; |
j3 | 17:b646b1e3970b | 320 | |
j3 | 17:b646b1e3970b | 321 | return CRC16; |
j3 | 15:f6cb0d906fb6 | 322 | } |
j3 | 15:f6cb0d906fb6 | 323 | |
j3 | 17:b646b1e3970b | 324 | uint16_t OneWireMaster::calculateCRC16(const uint8_t * data, size_t data_offset, size_t data_len, uint16_t crc) |
j3 | 17:b646b1e3970b | 325 | { |
j3 | 17:b646b1e3970b | 326 | for (size_t i = data_offset; i < (data_len + data_offset); i++) |
j3 | 17:b646b1e3970b | 327 | crc = calculateCRC16(crc, data[i]); |
j3 | 17:b646b1e3970b | 328 | return crc; |
IanBenzMaxim | 21:00c94aeb533e | 329 | } |