Implementation of 1-Wire with added Alarm Search Functionality
Dependents: Max32630_One_Wire_Interface
Masters/OneWireMaster.cpp@77:529edb329ee0, 2016-05-16 (annotated)
- Committer:
- IanBenzMaxim
- Date:
- Mon May 16 10:36:30 2016 -0500
- Revision:
- 77:529edb329ee0
- Parent:
- 76:84e6c4994e29
- Child:
- 78:0cbbac7f2016
Added iterators for selecting 1-Wire devices on the bus and added support iterator support to OneWireSlave class.
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 | 15:f6cb0d906fb6 | 33 | #include "OneWireMaster.h" |
IanBenzMaxim | 73:2cecc1372acc | 34 | #include "RomId.h" |
IanBenzMaxim | 27:d5aaefa252f1 | 35 | |
IanBenzMaxim | 76:84e6c4994e29 | 36 | using OneWire::OneWireMaster; |
j3 | 15:f6cb0d906fb6 | 37 | |
IanBenzMaxim | 77:529edb329ee0 | 38 | enum OwRomCmd |
IanBenzMaxim | 77:529edb329ee0 | 39 | { |
IanBenzMaxim | 77:529edb329ee0 | 40 | ReadRomCmd = 0x33, |
IanBenzMaxim | 77:529edb329ee0 | 41 | MatchRomCmd = 0x55, |
IanBenzMaxim | 77:529edb329ee0 | 42 | SearchRomCmd = 0xF0, |
IanBenzMaxim | 77:529edb329ee0 | 43 | SkipRomCmd = 0xCC, |
IanBenzMaxim | 77:529edb329ee0 | 44 | ResumeCmd = 0xA5, |
IanBenzMaxim | 77:529edb329ee0 | 45 | OverdriveSkipRomCmd = 0x3C, |
IanBenzMaxim | 77:529edb329ee0 | 46 | OverdriveMatchRomCmd = 0x69 |
IanBenzMaxim | 77:529edb329ee0 | 47 | }; |
IanBenzMaxim | 77:529edb329ee0 | 48 | |
IanBenzMaxim | 75:8b627804927c | 49 | OneWireMaster::CmdResult OneWireMaster::OWWriteBlock(const uint8_t *sendBuf, uint8_t sendLen) |
IanBenzMaxim | 71:562f5c702094 | 50 | { |
IanBenzMaxim | 71:562f5c702094 | 51 | CmdResult result; |
IanBenzMaxim | 74:23be10c32fa3 | 52 | |
IanBenzMaxim | 75:8b627804927c | 53 | for (uint8_t idx = 0; idx < sendLen; idx++) |
IanBenzMaxim | 71:562f5c702094 | 54 | { |
IanBenzMaxim | 75:8b627804927c | 55 | result = OWWriteByte(sendBuf[idx]); |
IanBenzMaxim | 74:23be10c32fa3 | 56 | if (result != Success) |
IanBenzMaxim | 71:562f5c702094 | 57 | { |
IanBenzMaxim | 71:562f5c702094 | 58 | break; |
IanBenzMaxim | 71:562f5c702094 | 59 | } |
IanBenzMaxim | 71:562f5c702094 | 60 | } |
IanBenzMaxim | 74:23be10c32fa3 | 61 | |
IanBenzMaxim | 71:562f5c702094 | 62 | return result; |
IanBenzMaxim | 71:562f5c702094 | 63 | } |
IanBenzMaxim | 71:562f5c702094 | 64 | |
IanBenzMaxim | 75:8b627804927c | 65 | OneWireMaster::CmdResult OneWireMaster::OWReadBlock(uint8_t *recvBuf, uint8_t recvLen) |
IanBenzMaxim | 71:562f5c702094 | 66 | { |
IanBenzMaxim | 71:562f5c702094 | 67 | CmdResult result; |
IanBenzMaxim | 74:23be10c32fa3 | 68 | |
IanBenzMaxim | 75:8b627804927c | 69 | for (uint8_t idx = 0; idx < recvLen; idx++) |
IanBenzMaxim | 71:562f5c702094 | 70 | { |
IanBenzMaxim | 75:8b627804927c | 71 | result = OWReadByte(recvBuf[idx]); |
IanBenzMaxim | 74:23be10c32fa3 | 72 | if (result != Success) |
IanBenzMaxim | 71:562f5c702094 | 73 | { |
IanBenzMaxim | 71:562f5c702094 | 74 | break; |
IanBenzMaxim | 71:562f5c702094 | 75 | } |
IanBenzMaxim | 71:562f5c702094 | 76 | } |
IanBenzMaxim | 74:23be10c32fa3 | 77 | |
IanBenzMaxim | 71:562f5c702094 | 78 | return result; |
IanBenzMaxim | 71:562f5c702094 | 79 | } |
IanBenzMaxim | 71:562f5c702094 | 80 | |
IanBenzMaxim | 75:8b627804927c | 81 | OneWireMaster::CmdResult OneWireMaster::OWTriplet(SearchDirection & searchDirection, uint8_t & sbr, uint8_t & tsb) |
IanBenzMaxim | 32:bce180b544ed | 82 | { |
IanBenzMaxim | 32:bce180b544ed | 83 | CmdResult result; |
IanBenzMaxim | 32:bce180b544ed | 84 | result = OWReadBit(sbr); |
IanBenzMaxim | 32:bce180b544ed | 85 | if (result == Success) |
IanBenzMaxim | 74:23be10c32fa3 | 86 | { |
IanBenzMaxim | 32:bce180b544ed | 87 | result = OWReadBit(tsb); |
IanBenzMaxim | 74:23be10c32fa3 | 88 | } |
IanBenzMaxim | 32:bce180b544ed | 89 | if (result == Success) |
IanBenzMaxim | 32:bce180b544ed | 90 | { |
IanBenzMaxim | 57:1635f247ceae | 91 | if (sbr) |
IanBenzMaxim | 74:23be10c32fa3 | 92 | { |
IanBenzMaxim | 75:8b627804927c | 93 | searchDirection = WriteOne; |
IanBenzMaxim | 74:23be10c32fa3 | 94 | } |
IanBenzMaxim | 57:1635f247ceae | 95 | else if (tsb) |
IanBenzMaxim | 74:23be10c32fa3 | 96 | { |
IanBenzMaxim | 75:8b627804927c | 97 | searchDirection = WriteZero; |
IanBenzMaxim | 74:23be10c32fa3 | 98 | } |
IanBenzMaxim | 32:bce180b544ed | 99 | // else: use search_direction parameter |
IanBenzMaxim | 74:23be10c32fa3 | 100 | |
IanBenzMaxim | 75:8b627804927c | 101 | result = OWWriteBit((searchDirection == WriteOne) ? 1 : 0); |
IanBenzMaxim | 32:bce180b544ed | 102 | } |
IanBenzMaxim | 32:bce180b544ed | 103 | return result; |
IanBenzMaxim | 32:bce180b544ed | 104 | } |
IanBenzMaxim | 32:bce180b544ed | 105 | |
IanBenzMaxim | 75:8b627804927c | 106 | uint16_t OneWireMaster::calculateCrc16(uint16_t crc16, uint16_t data) |
j3 | 15:f6cb0d906fb6 | 107 | { |
IanBenzMaxim | 75:8b627804927c | 108 | const uint16_t oddparity[] = { 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0 }; |
IanBenzMaxim | 74:23be10c32fa3 | 109 | |
IanBenzMaxim | 75:8b627804927c | 110 | data = (data ^ (crc16 & 0xff)) & 0xff; |
IanBenzMaxim | 75:8b627804927c | 111 | crc16 >>= 8; |
j3 | 17:b646b1e3970b | 112 | |
IanBenzMaxim | 75:8b627804927c | 113 | if (oddparity[data & 0xf] ^ oddparity[data >> 4]) |
IanBenzMaxim | 74:23be10c32fa3 | 114 | { |
IanBenzMaxim | 75:8b627804927c | 115 | crc16 ^= 0xc001; |
IanBenzMaxim | 74:23be10c32fa3 | 116 | } |
j3 | 17:b646b1e3970b | 117 | |
IanBenzMaxim | 74:23be10c32fa3 | 118 | data <<= 6; |
IanBenzMaxim | 75:8b627804927c | 119 | crc16 ^= data; |
IanBenzMaxim | 74:23be10c32fa3 | 120 | data <<= 1; |
IanBenzMaxim | 75:8b627804927c | 121 | crc16 ^= data; |
j3 | 17:b646b1e3970b | 122 | |
IanBenzMaxim | 75:8b627804927c | 123 | return crc16; |
j3 | 15:f6cb0d906fb6 | 124 | } |
j3 | 15:f6cb0d906fb6 | 125 | |
IanBenzMaxim | 75:8b627804927c | 126 | uint16_t OneWireMaster::calculateCrc16(const uint8_t * data, size_t dataOffset, size_t dataLen, uint16_t crc) |
IanBenzMaxim | 74:23be10c32fa3 | 127 | { |
IanBenzMaxim | 75:8b627804927c | 128 | for (size_t i = dataOffset; i < (dataLen + dataOffset); i++) |
IanBenzMaxim | 74:23be10c32fa3 | 129 | { |
IanBenzMaxim | 75:8b627804927c | 130 | crc = calculateCrc16(crc, data[i]); |
IanBenzMaxim | 74:23be10c32fa3 | 131 | } |
IanBenzMaxim | 74:23be10c32fa3 | 132 | return crc; |
IanBenzMaxim | 48:6f9208ae280e | 133 | } |
IanBenzMaxim | 77:529edb329ee0 | 134 | |
IanBenzMaxim | 77:529edb329ee0 | 135 | void OneWireMaster::SearchState::reset() |
IanBenzMaxim | 77:529edb329ee0 | 136 | { |
IanBenzMaxim | 77:529edb329ee0 | 137 | last_discrepancy = 0; |
IanBenzMaxim | 77:529edb329ee0 | 138 | last_device_flag = false; |
IanBenzMaxim | 77:529edb329ee0 | 139 | last_family_discrepancy = 0; |
IanBenzMaxim | 77:529edb329ee0 | 140 | romId.reset(); |
IanBenzMaxim | 77:529edb329ee0 | 141 | } |
IanBenzMaxim | 77:529edb329ee0 | 142 | |
IanBenzMaxim | 77:529edb329ee0 | 143 | void OneWireMaster::SearchState::findFamily(uint8_t familyCode) |
IanBenzMaxim | 77:529edb329ee0 | 144 | { |
IanBenzMaxim | 77:529edb329ee0 | 145 | reset(); |
IanBenzMaxim | 77:529edb329ee0 | 146 | romId.setFamilyCode(familyCode); |
IanBenzMaxim | 77:529edb329ee0 | 147 | last_discrepancy = 64; |
IanBenzMaxim | 77:529edb329ee0 | 148 | } |
IanBenzMaxim | 77:529edb329ee0 | 149 | |
IanBenzMaxim | 77:529edb329ee0 | 150 | void OneWireMaster::SearchState::skipCurrentFamily() |
IanBenzMaxim | 77:529edb329ee0 | 151 | { |
IanBenzMaxim | 77:529edb329ee0 | 152 | // set the Last discrepancy to last family discrepancy |
IanBenzMaxim | 77:529edb329ee0 | 153 | last_discrepancy = last_family_discrepancy; |
IanBenzMaxim | 77:529edb329ee0 | 154 | |
IanBenzMaxim | 77:529edb329ee0 | 155 | // clear the last family discrpepancy |
IanBenzMaxim | 77:529edb329ee0 | 156 | last_family_discrepancy = 0; |
IanBenzMaxim | 77:529edb329ee0 | 157 | |
IanBenzMaxim | 77:529edb329ee0 | 158 | // check for end of list |
IanBenzMaxim | 77:529edb329ee0 | 159 | if (last_discrepancy == 0) |
IanBenzMaxim | 77:529edb329ee0 | 160 | { |
IanBenzMaxim | 77:529edb329ee0 | 161 | last_device_flag = true; |
IanBenzMaxim | 77:529edb329ee0 | 162 | } |
IanBenzMaxim | 77:529edb329ee0 | 163 | } |
IanBenzMaxim | 77:529edb329ee0 | 164 | |
IanBenzMaxim | 77:529edb329ee0 | 165 | OneWireMaster::CmdResult OneWireMaster::OWFirst(SearchState & searchState) |
IanBenzMaxim | 77:529edb329ee0 | 166 | { |
IanBenzMaxim | 77:529edb329ee0 | 167 | // Reset and begin a new search |
IanBenzMaxim | 77:529edb329ee0 | 168 | searchState.reset(); |
IanBenzMaxim | 77:529edb329ee0 | 169 | return OWSearch(searchState); |
IanBenzMaxim | 77:529edb329ee0 | 170 | } |
IanBenzMaxim | 77:529edb329ee0 | 171 | |
IanBenzMaxim | 77:529edb329ee0 | 172 | OneWireMaster::CmdResult OneWireMaster::OWNext(SearchState & searchState) |
IanBenzMaxim | 77:529edb329ee0 | 173 | { |
IanBenzMaxim | 77:529edb329ee0 | 174 | // Continue the previous search |
IanBenzMaxim | 77:529edb329ee0 | 175 | return OWSearch(searchState); |
IanBenzMaxim | 77:529edb329ee0 | 176 | } |
IanBenzMaxim | 77:529edb329ee0 | 177 | |
IanBenzMaxim | 77:529edb329ee0 | 178 | OneWireMaster::CmdResult OneWireMaster::OWVerify(const RomId & romId) |
IanBenzMaxim | 77:529edb329ee0 | 179 | { |
IanBenzMaxim | 77:529edb329ee0 | 180 | OneWireMaster::CmdResult result; |
IanBenzMaxim | 77:529edb329ee0 | 181 | SearchState searchState; |
IanBenzMaxim | 77:529edb329ee0 | 182 | |
IanBenzMaxim | 77:529edb329ee0 | 183 | searchState.romId = romId; |
IanBenzMaxim | 77:529edb329ee0 | 184 | |
IanBenzMaxim | 77:529edb329ee0 | 185 | // set search to find the same device |
IanBenzMaxim | 77:529edb329ee0 | 186 | searchState.last_discrepancy = 64; |
IanBenzMaxim | 77:529edb329ee0 | 187 | searchState.last_device_flag = false; |
IanBenzMaxim | 77:529edb329ee0 | 188 | |
IanBenzMaxim | 77:529edb329ee0 | 189 | result = OWSearch(searchState); |
IanBenzMaxim | 77:529edb329ee0 | 190 | if (result == OneWireMaster::Success) |
IanBenzMaxim | 77:529edb329ee0 | 191 | { |
IanBenzMaxim | 77:529edb329ee0 | 192 | // check if same device found |
IanBenzMaxim | 77:529edb329ee0 | 193 | if (romId != searchState.romId) |
IanBenzMaxim | 77:529edb329ee0 | 194 | { |
IanBenzMaxim | 77:529edb329ee0 | 195 | result = OneWireMaster::OperationFailure; |
IanBenzMaxim | 77:529edb329ee0 | 196 | } |
IanBenzMaxim | 77:529edb329ee0 | 197 | } |
IanBenzMaxim | 77:529edb329ee0 | 198 | |
IanBenzMaxim | 77:529edb329ee0 | 199 | return result; |
IanBenzMaxim | 77:529edb329ee0 | 200 | } |
IanBenzMaxim | 77:529edb329ee0 | 201 | |
IanBenzMaxim | 77:529edb329ee0 | 202 | OneWireMaster::CmdResult OneWireMaster::OWReadRom(RomId & romId) |
IanBenzMaxim | 77:529edb329ee0 | 203 | { |
IanBenzMaxim | 77:529edb329ee0 | 204 | OneWireMaster::CmdResult result; |
IanBenzMaxim | 77:529edb329ee0 | 205 | RomId readId; |
IanBenzMaxim | 77:529edb329ee0 | 206 | |
IanBenzMaxim | 77:529edb329ee0 | 207 | result = OWReset(); |
IanBenzMaxim | 77:529edb329ee0 | 208 | if (result == OneWireMaster::Success) |
IanBenzMaxim | 77:529edb329ee0 | 209 | { |
IanBenzMaxim | 77:529edb329ee0 | 210 | result = OWWriteByte(ReadRomCmd); |
IanBenzMaxim | 77:529edb329ee0 | 211 | } |
IanBenzMaxim | 77:529edb329ee0 | 212 | |
IanBenzMaxim | 77:529edb329ee0 | 213 | // read the ROM |
IanBenzMaxim | 77:529edb329ee0 | 214 | if (result == OneWireMaster::Success) |
IanBenzMaxim | 77:529edb329ee0 | 215 | { |
IanBenzMaxim | 77:529edb329ee0 | 216 | result = OWReadBlock(readId, RomId::byteLen); |
IanBenzMaxim | 77:529edb329ee0 | 217 | } |
IanBenzMaxim | 77:529edb329ee0 | 218 | |
IanBenzMaxim | 77:529edb329ee0 | 219 | // verify CRC8 |
IanBenzMaxim | 77:529edb329ee0 | 220 | if (result == OneWireMaster::Success) |
IanBenzMaxim | 77:529edb329ee0 | 221 | { |
IanBenzMaxim | 77:529edb329ee0 | 222 | if (readId.crc8Valid()) |
IanBenzMaxim | 77:529edb329ee0 | 223 | { |
IanBenzMaxim | 77:529edb329ee0 | 224 | romId = readId; |
IanBenzMaxim | 77:529edb329ee0 | 225 | } |
IanBenzMaxim | 77:529edb329ee0 | 226 | else |
IanBenzMaxim | 77:529edb329ee0 | 227 | { |
IanBenzMaxim | 77:529edb329ee0 | 228 | result = OneWireMaster::OperationFailure; |
IanBenzMaxim | 77:529edb329ee0 | 229 | } |
IanBenzMaxim | 77:529edb329ee0 | 230 | } |
IanBenzMaxim | 77:529edb329ee0 | 231 | |
IanBenzMaxim | 77:529edb329ee0 | 232 | return result; |
IanBenzMaxim | 77:529edb329ee0 | 233 | } |
IanBenzMaxim | 77:529edb329ee0 | 234 | |
IanBenzMaxim | 77:529edb329ee0 | 235 | OneWireMaster::CmdResult OneWireMaster::OWSkipRom() |
IanBenzMaxim | 77:529edb329ee0 | 236 | { |
IanBenzMaxim | 77:529edb329ee0 | 237 | OneWireMaster::CmdResult result; |
IanBenzMaxim | 77:529edb329ee0 | 238 | |
IanBenzMaxim | 77:529edb329ee0 | 239 | result = OWReset(); |
IanBenzMaxim | 77:529edb329ee0 | 240 | if (result == OneWireMaster::Success) |
IanBenzMaxim | 77:529edb329ee0 | 241 | { |
IanBenzMaxim | 77:529edb329ee0 | 242 | result = OWWriteByte(SkipRomCmd); |
IanBenzMaxim | 77:529edb329ee0 | 243 | } |
IanBenzMaxim | 77:529edb329ee0 | 244 | |
IanBenzMaxim | 77:529edb329ee0 | 245 | return result; |
IanBenzMaxim | 77:529edb329ee0 | 246 | } |
IanBenzMaxim | 77:529edb329ee0 | 247 | |
IanBenzMaxim | 77:529edb329ee0 | 248 | OneWireMaster::CmdResult OneWireMaster::OWMatchRom(const RomId & romId) |
IanBenzMaxim | 77:529edb329ee0 | 249 | { |
IanBenzMaxim | 77:529edb329ee0 | 250 | OneWireMaster::CmdResult result; |
IanBenzMaxim | 77:529edb329ee0 | 251 | |
IanBenzMaxim | 77:529edb329ee0 | 252 | uint8_t buf[1 + RomId::byteLen]; |
IanBenzMaxim | 77:529edb329ee0 | 253 | |
IanBenzMaxim | 77:529edb329ee0 | 254 | // use MatchROM |
IanBenzMaxim | 77:529edb329ee0 | 255 | result = OWReset(); |
IanBenzMaxim | 77:529edb329ee0 | 256 | if (result == OneWireMaster::Success) |
IanBenzMaxim | 77:529edb329ee0 | 257 | { |
IanBenzMaxim | 77:529edb329ee0 | 258 | buf[0] = MatchRomCmd; |
IanBenzMaxim | 77:529edb329ee0 | 259 | std::memcpy(&buf[1], romId, RomId::byteLen); |
IanBenzMaxim | 77:529edb329ee0 | 260 | // send command and rom |
IanBenzMaxim | 77:529edb329ee0 | 261 | result = OWWriteBlock(buf, 1 + RomId::byteLen); |
IanBenzMaxim | 77:529edb329ee0 | 262 | } |
IanBenzMaxim | 77:529edb329ee0 | 263 | |
IanBenzMaxim | 77:529edb329ee0 | 264 | return result; |
IanBenzMaxim | 77:529edb329ee0 | 265 | } |
IanBenzMaxim | 77:529edb329ee0 | 266 | |
IanBenzMaxim | 77:529edb329ee0 | 267 | OneWireMaster::CmdResult OneWireMaster::OWOverdriveSkipRom() |
IanBenzMaxim | 77:529edb329ee0 | 268 | { |
IanBenzMaxim | 77:529edb329ee0 | 269 | OneWireMaster::CmdResult result = OWSetSpeed(OneWireMaster::StandardSpeed); |
IanBenzMaxim | 77:529edb329ee0 | 270 | |
IanBenzMaxim | 77:529edb329ee0 | 271 | if (result == OneWireMaster::Success) |
IanBenzMaxim | 77:529edb329ee0 | 272 | { |
IanBenzMaxim | 77:529edb329ee0 | 273 | result = OWReset(); |
IanBenzMaxim | 77:529edb329ee0 | 274 | } |
IanBenzMaxim | 77:529edb329ee0 | 275 | |
IanBenzMaxim | 77:529edb329ee0 | 276 | if (result == OneWireMaster::Success) |
IanBenzMaxim | 77:529edb329ee0 | 277 | { |
IanBenzMaxim | 77:529edb329ee0 | 278 | result = OWWriteByte(OverdriveSkipRomCmd); |
IanBenzMaxim | 77:529edb329ee0 | 279 | } |
IanBenzMaxim | 77:529edb329ee0 | 280 | |
IanBenzMaxim | 77:529edb329ee0 | 281 | if (result == OneWireMaster::Success) |
IanBenzMaxim | 77:529edb329ee0 | 282 | { |
IanBenzMaxim | 77:529edb329ee0 | 283 | result = OWSetSpeed(OneWireMaster::OverdriveSpeed); |
IanBenzMaxim | 77:529edb329ee0 | 284 | } |
IanBenzMaxim | 77:529edb329ee0 | 285 | |
IanBenzMaxim | 77:529edb329ee0 | 286 | return result; |
IanBenzMaxim | 77:529edb329ee0 | 287 | } |
IanBenzMaxim | 77:529edb329ee0 | 288 | |
IanBenzMaxim | 77:529edb329ee0 | 289 | OneWireMaster::CmdResult OneWireMaster::OWOverdriveMatchRom(const RomId & romId) |
IanBenzMaxim | 77:529edb329ee0 | 290 | { |
IanBenzMaxim | 77:529edb329ee0 | 291 | OneWireMaster::CmdResult result; |
IanBenzMaxim | 77:529edb329ee0 | 292 | |
IanBenzMaxim | 77:529edb329ee0 | 293 | // use overdrive MatchROM |
IanBenzMaxim | 77:529edb329ee0 | 294 | OWSetSpeed(OneWireMaster::StandardSpeed); |
IanBenzMaxim | 77:529edb329ee0 | 295 | |
IanBenzMaxim | 77:529edb329ee0 | 296 | result = OWReset(); |
IanBenzMaxim | 77:529edb329ee0 | 297 | if (result == OneWireMaster::Success) |
IanBenzMaxim | 77:529edb329ee0 | 298 | { |
IanBenzMaxim | 77:529edb329ee0 | 299 | result = OWWriteByte(OverdriveMatchRomCmd); |
IanBenzMaxim | 77:529edb329ee0 | 300 | if (result == OneWireMaster::Success) |
IanBenzMaxim | 77:529edb329ee0 | 301 | { |
IanBenzMaxim | 77:529edb329ee0 | 302 | OWSetSpeed(OneWireMaster::OverdriveSpeed); |
IanBenzMaxim | 77:529edb329ee0 | 303 | // send ROM |
IanBenzMaxim | 77:529edb329ee0 | 304 | result = OWWriteBlock(romId, RomId::byteLen); |
IanBenzMaxim | 77:529edb329ee0 | 305 | } |
IanBenzMaxim | 77:529edb329ee0 | 306 | } |
IanBenzMaxim | 77:529edb329ee0 | 307 | return result; |
IanBenzMaxim | 77:529edb329ee0 | 308 | } |
IanBenzMaxim | 77:529edb329ee0 | 309 | |
IanBenzMaxim | 77:529edb329ee0 | 310 | OneWireMaster::CmdResult OneWireMaster::OWResume() |
IanBenzMaxim | 77:529edb329ee0 | 311 | { |
IanBenzMaxim | 77:529edb329ee0 | 312 | OneWireMaster::CmdResult result; |
IanBenzMaxim | 77:529edb329ee0 | 313 | |
IanBenzMaxim | 77:529edb329ee0 | 314 | result = OWReset(); |
IanBenzMaxim | 77:529edb329ee0 | 315 | if (result == OneWireMaster::Success) |
IanBenzMaxim | 77:529edb329ee0 | 316 | { |
IanBenzMaxim | 77:529edb329ee0 | 317 | result = OWWriteByte(ResumeCmd); |
IanBenzMaxim | 77:529edb329ee0 | 318 | } |
IanBenzMaxim | 77:529edb329ee0 | 319 | |
IanBenzMaxim | 77:529edb329ee0 | 320 | return result; |
IanBenzMaxim | 77:529edb329ee0 | 321 | } |
IanBenzMaxim | 77:529edb329ee0 | 322 | |
IanBenzMaxim | 77:529edb329ee0 | 323 | OneWireMaster::CmdResult OneWireMaster::OWSearch(SearchState & searchState) |
IanBenzMaxim | 77:529edb329ee0 | 324 | { |
IanBenzMaxim | 77:529edb329ee0 | 325 | uint8_t id_bit_number; |
IanBenzMaxim | 77:529edb329ee0 | 326 | uint8_t last_zero, rom_byte_number; |
IanBenzMaxim | 77:529edb329ee0 | 327 | uint8_t id_bit, cmp_id_bit; |
IanBenzMaxim | 77:529edb329ee0 | 328 | uint8_t rom_byte_mask; |
IanBenzMaxim | 77:529edb329ee0 | 329 | bool search_result; |
IanBenzMaxim | 77:529edb329ee0 | 330 | uint8_t crc8 = 0; |
IanBenzMaxim | 77:529edb329ee0 | 331 | OneWireMaster::SearchDirection search_direction; |
IanBenzMaxim | 77:529edb329ee0 | 332 | |
IanBenzMaxim | 77:529edb329ee0 | 333 | // initialize for search |
IanBenzMaxim | 77:529edb329ee0 | 334 | id_bit_number = 1; |
IanBenzMaxim | 77:529edb329ee0 | 335 | last_zero = 0; |
IanBenzMaxim | 77:529edb329ee0 | 336 | rom_byte_number = 0; |
IanBenzMaxim | 77:529edb329ee0 | 337 | rom_byte_mask = 1; |
IanBenzMaxim | 77:529edb329ee0 | 338 | search_result = false; |
IanBenzMaxim | 77:529edb329ee0 | 339 | |
IanBenzMaxim | 77:529edb329ee0 | 340 | // if the last call was not the last one |
IanBenzMaxim | 77:529edb329ee0 | 341 | if (!searchState.last_device_flag) |
IanBenzMaxim | 77:529edb329ee0 | 342 | { |
IanBenzMaxim | 77:529edb329ee0 | 343 | // 1-Wire reset |
IanBenzMaxim | 77:529edb329ee0 | 344 | OneWireMaster::CmdResult result = OWReset(); |
IanBenzMaxim | 77:529edb329ee0 | 345 | if (result != OneWireMaster::Success) |
IanBenzMaxim | 77:529edb329ee0 | 346 | { |
IanBenzMaxim | 77:529edb329ee0 | 347 | // reset the search |
IanBenzMaxim | 77:529edb329ee0 | 348 | searchState.reset(); |
IanBenzMaxim | 77:529edb329ee0 | 349 | return result; |
IanBenzMaxim | 77:529edb329ee0 | 350 | } |
IanBenzMaxim | 77:529edb329ee0 | 351 | |
IanBenzMaxim | 77:529edb329ee0 | 352 | // issue the search command |
IanBenzMaxim | 77:529edb329ee0 | 353 | OWWriteByte(SearchRomCmd); |
IanBenzMaxim | 77:529edb329ee0 | 354 | |
IanBenzMaxim | 77:529edb329ee0 | 355 | // loop to do the search |
IanBenzMaxim | 77:529edb329ee0 | 356 | do |
IanBenzMaxim | 77:529edb329ee0 | 357 | { |
IanBenzMaxim | 77:529edb329ee0 | 358 | // if this discrepancy if before the Last Discrepancy |
IanBenzMaxim | 77:529edb329ee0 | 359 | // on a previous next then pick the same as last time |
IanBenzMaxim | 77:529edb329ee0 | 360 | if (id_bit_number < searchState.last_discrepancy) |
IanBenzMaxim | 77:529edb329ee0 | 361 | { |
IanBenzMaxim | 77:529edb329ee0 | 362 | if ((searchState.romId[rom_byte_number] & rom_byte_mask) > 0) |
IanBenzMaxim | 77:529edb329ee0 | 363 | { |
IanBenzMaxim | 77:529edb329ee0 | 364 | search_direction = OneWireMaster::WriteOne; |
IanBenzMaxim | 77:529edb329ee0 | 365 | } |
IanBenzMaxim | 77:529edb329ee0 | 366 | else |
IanBenzMaxim | 77:529edb329ee0 | 367 | { |
IanBenzMaxim | 77:529edb329ee0 | 368 | search_direction = OneWireMaster::WriteZero; |
IanBenzMaxim | 77:529edb329ee0 | 369 | } |
IanBenzMaxim | 77:529edb329ee0 | 370 | } |
IanBenzMaxim | 77:529edb329ee0 | 371 | else |
IanBenzMaxim | 77:529edb329ee0 | 372 | { |
IanBenzMaxim | 77:529edb329ee0 | 373 | // if equal to last pick 1, if not then pick 0 |
IanBenzMaxim | 77:529edb329ee0 | 374 | if (id_bit_number == searchState.last_discrepancy) |
IanBenzMaxim | 77:529edb329ee0 | 375 | { |
IanBenzMaxim | 77:529edb329ee0 | 376 | search_direction = OneWireMaster::WriteOne; |
IanBenzMaxim | 77:529edb329ee0 | 377 | } |
IanBenzMaxim | 77:529edb329ee0 | 378 | else |
IanBenzMaxim | 77:529edb329ee0 | 379 | { |
IanBenzMaxim | 77:529edb329ee0 | 380 | search_direction = OneWireMaster::WriteZero; |
IanBenzMaxim | 77:529edb329ee0 | 381 | } |
IanBenzMaxim | 77:529edb329ee0 | 382 | } |
IanBenzMaxim | 77:529edb329ee0 | 383 | |
IanBenzMaxim | 77:529edb329ee0 | 384 | // Peform a triple operation on the DS2465 which will perform 2 read bits and 1 write bit |
IanBenzMaxim | 77:529edb329ee0 | 385 | result = OWTriplet(search_direction, id_bit, cmp_id_bit); |
IanBenzMaxim | 77:529edb329ee0 | 386 | if (result != OneWireMaster::Success) |
IanBenzMaxim | 77:529edb329ee0 | 387 | { |
IanBenzMaxim | 77:529edb329ee0 | 388 | return result; |
IanBenzMaxim | 77:529edb329ee0 | 389 | } |
IanBenzMaxim | 77:529edb329ee0 | 390 | |
IanBenzMaxim | 77:529edb329ee0 | 391 | // check for no devices on 1-wire |
IanBenzMaxim | 77:529edb329ee0 | 392 | if (id_bit && cmp_id_bit) |
IanBenzMaxim | 77:529edb329ee0 | 393 | { |
IanBenzMaxim | 77:529edb329ee0 | 394 | break; |
IanBenzMaxim | 77:529edb329ee0 | 395 | } |
IanBenzMaxim | 77:529edb329ee0 | 396 | else |
IanBenzMaxim | 77:529edb329ee0 | 397 | { |
IanBenzMaxim | 77:529edb329ee0 | 398 | if (!id_bit && !cmp_id_bit && (search_direction == OneWireMaster::WriteZero)) |
IanBenzMaxim | 77:529edb329ee0 | 399 | { |
IanBenzMaxim | 77:529edb329ee0 | 400 | last_zero = id_bit_number; |
IanBenzMaxim | 77:529edb329ee0 | 401 | |
IanBenzMaxim | 77:529edb329ee0 | 402 | // check for Last discrepancy in family |
IanBenzMaxim | 77:529edb329ee0 | 403 | if (last_zero < 9) |
IanBenzMaxim | 77:529edb329ee0 | 404 | { |
IanBenzMaxim | 77:529edb329ee0 | 405 | searchState.last_family_discrepancy = last_zero; |
IanBenzMaxim | 77:529edb329ee0 | 406 | } |
IanBenzMaxim | 77:529edb329ee0 | 407 | } |
IanBenzMaxim | 77:529edb329ee0 | 408 | |
IanBenzMaxim | 77:529edb329ee0 | 409 | // set or clear the bit in the ROM byte rom_byte_number |
IanBenzMaxim | 77:529edb329ee0 | 410 | // with mask rom_byte_mask |
IanBenzMaxim | 77:529edb329ee0 | 411 | if (search_direction == OneWireMaster::WriteOne) |
IanBenzMaxim | 77:529edb329ee0 | 412 | { |
IanBenzMaxim | 77:529edb329ee0 | 413 | searchState.romId[rom_byte_number] |= rom_byte_mask; |
IanBenzMaxim | 77:529edb329ee0 | 414 | } |
IanBenzMaxim | 77:529edb329ee0 | 415 | else |
IanBenzMaxim | 77:529edb329ee0 | 416 | { |
IanBenzMaxim | 77:529edb329ee0 | 417 | searchState.romId[rom_byte_number] &= (uint8_t)~rom_byte_mask; |
IanBenzMaxim | 77:529edb329ee0 | 418 | } |
IanBenzMaxim | 77:529edb329ee0 | 419 | |
IanBenzMaxim | 77:529edb329ee0 | 420 | // increment the byte counter id_bit_number |
IanBenzMaxim | 77:529edb329ee0 | 421 | // and shift the mask rom_byte_mask |
IanBenzMaxim | 77:529edb329ee0 | 422 | id_bit_number++; |
IanBenzMaxim | 77:529edb329ee0 | 423 | rom_byte_mask <<= 1; |
IanBenzMaxim | 77:529edb329ee0 | 424 | |
IanBenzMaxim | 77:529edb329ee0 | 425 | // if the mask is 0 then go to new SerialNum byte rom_byte_number and reset mask |
IanBenzMaxim | 77:529edb329ee0 | 426 | if (rom_byte_mask == 0) |
IanBenzMaxim | 77:529edb329ee0 | 427 | { |
IanBenzMaxim | 77:529edb329ee0 | 428 | crc8 = RomId::calculateCrc8(crc8, searchState.romId[rom_byte_number]); // accumulate the CRC |
IanBenzMaxim | 77:529edb329ee0 | 429 | rom_byte_number++; |
IanBenzMaxim | 77:529edb329ee0 | 430 | rom_byte_mask = 1; |
IanBenzMaxim | 77:529edb329ee0 | 431 | } |
IanBenzMaxim | 77:529edb329ee0 | 432 | } |
IanBenzMaxim | 77:529edb329ee0 | 433 | } while (rom_byte_number < RomId::byteLen); // loop until through all ROM bytes 0-7 |
IanBenzMaxim | 77:529edb329ee0 | 434 | |
IanBenzMaxim | 77:529edb329ee0 | 435 | // if the search was successful then |
IanBenzMaxim | 77:529edb329ee0 | 436 | if (!((id_bit_number <= (RomId::byteLen * 8)) || (crc8 != 0))) |
IanBenzMaxim | 77:529edb329ee0 | 437 | { |
IanBenzMaxim | 77:529edb329ee0 | 438 | // search successful so set m_last_discrepancy,m_last_device_flag,search_result |
IanBenzMaxim | 77:529edb329ee0 | 439 | searchState.last_discrepancy = last_zero; |
IanBenzMaxim | 77:529edb329ee0 | 440 | |
IanBenzMaxim | 77:529edb329ee0 | 441 | // check for last device |
IanBenzMaxim | 77:529edb329ee0 | 442 | if (searchState.last_discrepancy == 0) |
IanBenzMaxim | 77:529edb329ee0 | 443 | { |
IanBenzMaxim | 77:529edb329ee0 | 444 | searchState.last_device_flag = true; |
IanBenzMaxim | 77:529edb329ee0 | 445 | } |
IanBenzMaxim | 77:529edb329ee0 | 446 | |
IanBenzMaxim | 77:529edb329ee0 | 447 | search_result = true; |
IanBenzMaxim | 77:529edb329ee0 | 448 | } |
IanBenzMaxim | 77:529edb329ee0 | 449 | } |
IanBenzMaxim | 77:529edb329ee0 | 450 | |
IanBenzMaxim | 77:529edb329ee0 | 451 | // if no device found then reset counters so next 'search' will be like a first |
IanBenzMaxim | 77:529edb329ee0 | 452 | if (!search_result || (searchState.romId.familyCode() == 0)) |
IanBenzMaxim | 77:529edb329ee0 | 453 | { |
IanBenzMaxim | 77:529edb329ee0 | 454 | searchState.reset(); |
IanBenzMaxim | 77:529edb329ee0 | 455 | search_result = false; |
IanBenzMaxim | 77:529edb329ee0 | 456 | } |
IanBenzMaxim | 77:529edb329ee0 | 457 | |
IanBenzMaxim | 77:529edb329ee0 | 458 | return (search_result ? OneWireMaster::Success : OneWireMaster::OperationFailure); |
IanBenzMaxim | 77:529edb329ee0 | 459 | } |