Implementation of 1-Wire with added Alarm Search Functionality
Dependents: Max32630_One_Wire_Interface
Masters/DS248x/DS248x.cpp@91:e80108bc870a, 2016-06-20 (annotated)
- Committer:
- j3
- Date:
- Mon Jun 20 19:39:21 2016 +0000
- Revision:
- 91:e80108bc870a
- Parent:
- 84:708b7be59fb2
- Child:
- 104:3f48daed532b
Created derived classes for DS248x series
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
j3 | 1:91e52f8ab8bf | 1 | /******************************************************************//** |
j3 | 1:91e52f8ab8bf | 2 | * Copyright (C) 2016 Maxim Integrated Products, Inc., All Rights Reserved. |
j3 | 1:91e52f8ab8bf | 3 | * |
j3 | 1:91e52f8ab8bf | 4 | * Permission is hereby granted, free of charge, to any person obtaining a |
j3 | 1:91e52f8ab8bf | 5 | * copy of this software and associated documentation files (the "Software"), |
j3 | 1:91e52f8ab8bf | 6 | * to deal in the Software without restriction, including without limitation |
j3 | 1:91e52f8ab8bf | 7 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
j3 | 1:91e52f8ab8bf | 8 | * and/or sell copies of the Software, and to permit persons to whom the |
j3 | 1:91e52f8ab8bf | 9 | * Software is furnished to do so, subject to the following conditions: |
j3 | 1:91e52f8ab8bf | 10 | * |
j3 | 1:91e52f8ab8bf | 11 | * The above copyright notice and this permission notice shall be included |
j3 | 1:91e52f8ab8bf | 12 | * in all copies or substantial portions of the Software. |
j3 | 1:91e52f8ab8bf | 13 | * |
j3 | 1:91e52f8ab8bf | 14 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
j3 | 1:91e52f8ab8bf | 15 | * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
j3 | 1:91e52f8ab8bf | 16 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. |
j3 | 1:91e52f8ab8bf | 17 | * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES |
j3 | 1:91e52f8ab8bf | 18 | * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
j3 | 1:91e52f8ab8bf | 19 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
j3 | 1:91e52f8ab8bf | 20 | * OTHER DEALINGS IN THE SOFTWARE. |
j3 | 1:91e52f8ab8bf | 21 | * |
j3 | 1:91e52f8ab8bf | 22 | * Except as contained in this notice, the name of Maxim Integrated |
j3 | 1:91e52f8ab8bf | 23 | * Products, Inc. shall not be used except as stated in the Maxim Integrated |
j3 | 1:91e52f8ab8bf | 24 | * Products, Inc. Branding Policy. |
j3 | 1:91e52f8ab8bf | 25 | * |
j3 | 1:91e52f8ab8bf | 26 | * The mere transfer of this software does not imply any licenses |
j3 | 1:91e52f8ab8bf | 27 | * of trade secrets, proprietary technology, copyrights, patents, |
j3 | 1:91e52f8ab8bf | 28 | * trademarks, maskwork rights, or any other form of intellectual |
j3 | 1:91e52f8ab8bf | 29 | * property whatsoever. Maxim Integrated Products, Inc. retains all |
j3 | 1:91e52f8ab8bf | 30 | * ownership rights. |
j3 | 1:91e52f8ab8bf | 31 | **********************************************************************/ |
j3 | 1:91e52f8ab8bf | 32 | |
IanBenzMaxim | 73:2cecc1372acc | 33 | #include "DS248x.h" |
IanBenzMaxim | 73:2cecc1372acc | 34 | #include "I2C.h" |
j3 | 1:91e52f8ab8bf | 35 | |
IanBenzMaxim | 76:84e6c4994e29 | 36 | using OneWire::OneWireMaster; |
IanBenzMaxim | 76:84e6c4994e29 | 37 | using OneWire::DS248x; |
j3 | 1:91e52f8ab8bf | 38 | |
IanBenzMaxim | 78:0cbbac7f2016 | 39 | /// DS248x Status Bits |
IanBenzMaxim | 78:0cbbac7f2016 | 40 | enum StatusBit |
IanBenzMaxim | 69:f915c4c59a69 | 41 | { |
IanBenzMaxim | 78:0cbbac7f2016 | 42 | Status_1WB = 0x01, |
IanBenzMaxim | 78:0cbbac7f2016 | 43 | Status_PPD = 0x02, |
IanBenzMaxim | 78:0cbbac7f2016 | 44 | Status_SD = 0x04, |
IanBenzMaxim | 78:0cbbac7f2016 | 45 | Status_LL = 0x08, |
IanBenzMaxim | 78:0cbbac7f2016 | 46 | Status_RST = 0x10, |
IanBenzMaxim | 78:0cbbac7f2016 | 47 | Status_SBR = 0x20, |
IanBenzMaxim | 78:0cbbac7f2016 | 48 | Status_TSB = 0x40, |
IanBenzMaxim | 78:0cbbac7f2016 | 49 | Status_DIR = 0x80 |
IanBenzMaxim | 69:f915c4c59a69 | 50 | }; |
IanBenzMaxim | 69:f915c4c59a69 | 51 | |
IanBenzMaxim | 69:f915c4c59a69 | 52 | static const int I2C_WRITE_OK = 0; |
IanBenzMaxim | 69:f915c4c59a69 | 53 | static const int I2C_READ_OK = 0; |
IanBenzMaxim | 69:f915c4c59a69 | 54 | |
IanBenzMaxim | 73:2cecc1372acc | 55 | uint8_t DS248x::Config::readByte() const |
IanBenzMaxim | 69:f915c4c59a69 | 56 | { |
IanBenzMaxim | 74:23be10c32fa3 | 57 | uint8_t config = 0; |
IanBenzMaxim | 74:23be10c32fa3 | 58 | if (get1WS()) |
IanBenzMaxim | 74:23be10c32fa3 | 59 | { |
IanBenzMaxim | 74:23be10c32fa3 | 60 | config |= 0x08; |
IanBenzMaxim | 74:23be10c32fa3 | 61 | } |
IanBenzMaxim | 74:23be10c32fa3 | 62 | if (getSPU()) |
IanBenzMaxim | 74:23be10c32fa3 | 63 | { |
IanBenzMaxim | 74:23be10c32fa3 | 64 | config |= 0x04; |
IanBenzMaxim | 74:23be10c32fa3 | 65 | } |
IanBenzMaxim | 74:23be10c32fa3 | 66 | if (getPDN()) |
IanBenzMaxim | 74:23be10c32fa3 | 67 | { |
IanBenzMaxim | 74:23be10c32fa3 | 68 | config |= 0x02; |
IanBenzMaxim | 74:23be10c32fa3 | 69 | } |
IanBenzMaxim | 74:23be10c32fa3 | 70 | if (getAPU()) |
IanBenzMaxim | 74:23be10c32fa3 | 71 | { |
IanBenzMaxim | 74:23be10c32fa3 | 72 | config |= 0x01; |
IanBenzMaxim | 74:23be10c32fa3 | 73 | } |
IanBenzMaxim | 74:23be10c32fa3 | 74 | return config; |
IanBenzMaxim | 69:f915c4c59a69 | 75 | } |
IanBenzMaxim | 69:f915c4c59a69 | 76 | |
IanBenzMaxim | 73:2cecc1372acc | 77 | uint8_t DS248x::Config::writeByte() const |
IanBenzMaxim | 69:f915c4c59a69 | 78 | { |
IanBenzMaxim | 74:23be10c32fa3 | 79 | uint8_t config = readByte(); |
IanBenzMaxim | 74:23be10c32fa3 | 80 | return ((~config << 4) | config); |
IanBenzMaxim | 69:f915c4c59a69 | 81 | } |
IanBenzMaxim | 69:f915c4c59a69 | 82 | |
IanBenzMaxim | 73:2cecc1372acc | 83 | void DS248x::Config::reset() |
IanBenzMaxim | 69:f915c4c59a69 | 84 | { |
IanBenzMaxim | 74:23be10c32fa3 | 85 | set1WS(false); |
IanBenzMaxim | 74:23be10c32fa3 | 86 | setSPU(false); |
IanBenzMaxim | 74:23be10c32fa3 | 87 | setPDN(false); |
IanBenzMaxim | 74:23be10c32fa3 | 88 | setAPU(true); |
IanBenzMaxim | 69:f915c4c59a69 | 89 | } |
IanBenzMaxim | 69:f915c4c59a69 | 90 | |
j3 | 91:e80108bc870a | 91 | |
j3 | 91:e80108bc870a | 92 | DS248x::DS248x(mbed::I2C & i2c_bus, uint8_t adrs): |
j3 | 91:e80108bc870a | 93 | m_i2c_bus(i2c_bus), m_adrs(adrs) |
IanBenzMaxim | 73:2cecc1372acc | 94 | { |
j3 | 1:91e52f8ab8bf | 95 | } |
j3 | 1:91e52f8ab8bf | 96 | |
j3 | 1:91e52f8ab8bf | 97 | |
IanBenzMaxim | 73:2cecc1372acc | 98 | OneWireMaster::CmdResult DS248x::OWInitMaster(void) |
j3 | 14:7b2886a50321 | 99 | { |
IanBenzMaxim | 69:f915c4c59a69 | 100 | OneWireMaster::CmdResult result; |
j3 | 14:7b2886a50321 | 101 | |
IanBenzMaxim | 69:f915c4c59a69 | 102 | // reset DS2465 |
j3 | 17:b646b1e3970b | 103 | result = reset(); |
IanBenzMaxim | 69:f915c4c59a69 | 104 | if (result != OneWireMaster::Success) |
IanBenzMaxim | 74:23be10c32fa3 | 105 | { |
IanBenzMaxim | 74:23be10c32fa3 | 106 | return result; |
IanBenzMaxim | 74:23be10c32fa3 | 107 | } |
IanBenzMaxim | 69:f915c4c59a69 | 108 | |
IanBenzMaxim | 69:f915c4c59a69 | 109 | // write the default configuration setup |
IanBenzMaxim | 69:f915c4c59a69 | 110 | Config defaultConfig; |
IanBenzMaxim | 69:f915c4c59a69 | 111 | result = writeConfig(defaultConfig, true); |
j3 | 17:b646b1e3970b | 112 | return result; |
j3 | 2:02d228c25fd4 | 113 | } |
j3 | 2:02d228c25fd4 | 114 | |
IanBenzMaxim | 73:2cecc1372acc | 115 | OneWireMaster::CmdResult DS248x::reset(void) |
IanBenzMaxim | 74:23be10c32fa3 | 116 | { |
j3 | 2:02d228c25fd4 | 117 | // Device Reset |
j3 | 2:02d228c25fd4 | 118 | // S AD,0 [A] DRST [A] Sr AD,1 [A] [SS] A\ P |
j3 | 2:02d228c25fd4 | 119 | // [] indicates from slave |
j3 | 2:02d228c25fd4 | 120 | // SS status byte to read to verify state |
IanBenzMaxim | 74:23be10c32fa3 | 121 | |
IanBenzMaxim | 74:23be10c32fa3 | 122 | OneWireMaster::CmdResult result; |
IanBenzMaxim | 74:23be10c32fa3 | 123 | uint8_t buf; |
IanBenzMaxim | 74:23be10c32fa3 | 124 | |
IanBenzMaxim | 75:8b627804927c | 125 | result = sendCommand(DeviceResetCmd); |
IanBenzMaxim | 74:23be10c32fa3 | 126 | |
IanBenzMaxim | 74:23be10c32fa3 | 127 | if (result == OneWireMaster::Success) |
IanBenzMaxim | 74:23be10c32fa3 | 128 | { |
IanBenzMaxim | 74:23be10c32fa3 | 129 | result = readRegister(StatusReg, buf, true); |
IanBenzMaxim | 74:23be10c32fa3 | 130 | } |
IanBenzMaxim | 69:f915c4c59a69 | 131 | |
IanBenzMaxim | 74:23be10c32fa3 | 132 | if (result == OneWireMaster::Success) |
IanBenzMaxim | 74:23be10c32fa3 | 133 | { |
IanBenzMaxim | 74:23be10c32fa3 | 134 | if ((buf & 0xF7) != 0x10) |
IanBenzMaxim | 74:23be10c32fa3 | 135 | { |
IanBenzMaxim | 74:23be10c32fa3 | 136 | result = OneWireMaster::OperationFailure; |
IanBenzMaxim | 74:23be10c32fa3 | 137 | } |
IanBenzMaxim | 74:23be10c32fa3 | 138 | } |
IanBenzMaxim | 69:f915c4c59a69 | 139 | |
IanBenzMaxim | 74:23be10c32fa3 | 140 | if (result == OneWireMaster::Success) |
IanBenzMaxim | 74:23be10c32fa3 | 141 | { |
IanBenzMaxim | 74:23be10c32fa3 | 142 | OWReset(); // do a command to get 1-Wire master reset out of holding state |
IanBenzMaxim | 74:23be10c32fa3 | 143 | } |
IanBenzMaxim | 74:23be10c32fa3 | 144 | |
IanBenzMaxim | 74:23be10c32fa3 | 145 | return result; |
j3 | 2:02d228c25fd4 | 146 | } |
j3 | 2:02d228c25fd4 | 147 | |
IanBenzMaxim | 69:f915c4c59a69 | 148 | |
IanBenzMaxim | 75:8b627804927c | 149 | OneWireMaster::CmdResult DS248x::OWTriplet(SearchDirection & searchDirection, uint8_t & sbr, uint8_t & tsb) |
IanBenzMaxim | 69:f915c4c59a69 | 150 | { |
IanBenzMaxim | 69:f915c4c59a69 | 151 | // 1-Wire Triplet (Case B) |
IanBenzMaxim | 69:f915c4c59a69 | 152 | // S AD,0 [A] 1WT [A] SS [A] Sr AD,1 [A] [Status] A [Status] A\ P |
IanBenzMaxim | 69:f915c4c59a69 | 153 | // \--------/ |
IanBenzMaxim | 69:f915c4c59a69 | 154 | // Repeat until 1WB bit has changed to 0 |
IanBenzMaxim | 69:f915c4c59a69 | 155 | // [] indicates from slave |
IanBenzMaxim | 69:f915c4c59a69 | 156 | // SS indicates byte containing search direction bit value in msbit |
IanBenzMaxim | 69:f915c4c59a69 | 157 | |
IanBenzMaxim | 74:23be10c32fa3 | 158 | OneWireMaster::CmdResult result; |
IanBenzMaxim | 75:8b627804927c | 159 | result = sendCommand(OwTripletCmd, (uint8_t)((searchDirection == WriteOne) ? 0x80 : 0x00)); |
IanBenzMaxim | 69:f915c4c59a69 | 160 | if (result == OneWireMaster::Success) |
IanBenzMaxim | 69:f915c4c59a69 | 161 | { |
IanBenzMaxim | 74:23be10c32fa3 | 162 | uint8_t status; |
IanBenzMaxim | 74:23be10c32fa3 | 163 | result = pollBusy(&status); |
IanBenzMaxim | 74:23be10c32fa3 | 164 | if (result == OneWireMaster::Success) |
IanBenzMaxim | 74:23be10c32fa3 | 165 | { |
IanBenzMaxim | 74:23be10c32fa3 | 166 | // check bit results in status byte |
IanBenzMaxim | 78:0cbbac7f2016 | 167 | sbr = ((status & Status_SBR) == Status_SBR); |
IanBenzMaxim | 78:0cbbac7f2016 | 168 | tsb = ((status & Status_TSB) == Status_TSB); |
IanBenzMaxim | 78:0cbbac7f2016 | 169 | searchDirection = ((status & Status_DIR) == Status_DIR) ? WriteOne : WriteZero; |
IanBenzMaxim | 74:23be10c32fa3 | 170 | } |
IanBenzMaxim | 69:f915c4c59a69 | 171 | } |
IanBenzMaxim | 74:23be10c32fa3 | 172 | return result; |
IanBenzMaxim | 69:f915c4c59a69 | 173 | } |
IanBenzMaxim | 69:f915c4c59a69 | 174 | |
IanBenzMaxim | 75:8b627804927c | 175 | OneWireMaster::CmdResult DS248x::OWReset() |
IanBenzMaxim | 69:f915c4c59a69 | 176 | { |
IanBenzMaxim | 69:f915c4c59a69 | 177 | // 1-Wire reset (Case B) |
IanBenzMaxim | 69:f915c4c59a69 | 178 | // S AD,0 [A] 1WRS [A] Sr AD,1 [A] [Status] A [Status] A\ P |
IanBenzMaxim | 69:f915c4c59a69 | 179 | // \--------/ |
IanBenzMaxim | 69:f915c4c59a69 | 180 | // Repeat until 1WB bit has changed to 0 |
IanBenzMaxim | 69:f915c4c59a69 | 181 | // [] indicates from slave |
IanBenzMaxim | 69:f915c4c59a69 | 182 | |
IanBenzMaxim | 74:23be10c32fa3 | 183 | OneWireMaster::CmdResult result; |
IanBenzMaxim | 74:23be10c32fa3 | 184 | uint8_t buf; |
IanBenzMaxim | 74:23be10c32fa3 | 185 | |
IanBenzMaxim | 75:8b627804927c | 186 | result = sendCommand(OwResetCmd); |
IanBenzMaxim | 74:23be10c32fa3 | 187 | |
IanBenzMaxim | 74:23be10c32fa3 | 188 | if (result == OneWireMaster::Success) |
IanBenzMaxim | 74:23be10c32fa3 | 189 | { |
IanBenzMaxim | 74:23be10c32fa3 | 190 | result = pollBusy(&buf); |
IanBenzMaxim | 74:23be10c32fa3 | 191 | } |
IanBenzMaxim | 69:f915c4c59a69 | 192 | |
IanBenzMaxim | 74:23be10c32fa3 | 193 | if (result == OneWireMaster::Success) |
IanBenzMaxim | 74:23be10c32fa3 | 194 | { |
IanBenzMaxim | 74:23be10c32fa3 | 195 | // check for presence detect |
IanBenzMaxim | 78:0cbbac7f2016 | 196 | if ((buf & Status_PPD) != Status_PPD) |
IanBenzMaxim | 74:23be10c32fa3 | 197 | { |
IanBenzMaxim | 74:23be10c32fa3 | 198 | result = OneWireMaster::OperationFailure; |
IanBenzMaxim | 74:23be10c32fa3 | 199 | } |
IanBenzMaxim | 74:23be10c32fa3 | 200 | } |
IanBenzMaxim | 69:f915c4c59a69 | 201 | |
IanBenzMaxim | 74:23be10c32fa3 | 202 | return result; |
IanBenzMaxim | 69:f915c4c59a69 | 203 | } |
IanBenzMaxim | 69:f915c4c59a69 | 204 | |
IanBenzMaxim | 75:8b627804927c | 205 | OneWireMaster::CmdResult DS248x::OWTouchBitSetLevel(uint8_t & sendRecvBit, OWLevel afterLevel) |
IanBenzMaxim | 69:f915c4c59a69 | 206 | { |
j3 | 2:02d228c25fd4 | 207 | // 1-Wire bit (Case B) |
j3 | 2:02d228c25fd4 | 208 | // S AD,0 [A] 1WSB [A] BB [A] Sr AD,1 [A] [Status] A [Status] A\ P |
j3 | 2:02d228c25fd4 | 209 | // \--------/ |
j3 | 2:02d228c25fd4 | 210 | // Repeat until 1WB bit has changed to 0 |
j3 | 2:02d228c25fd4 | 211 | // [] indicates from slave |
j3 | 2:02d228c25fd4 | 212 | // BB indicates byte containing bit value in msbit |
j3 | 2:02d228c25fd4 | 213 | |
IanBenzMaxim | 74:23be10c32fa3 | 214 | OneWireMaster::CmdResult result; |
IanBenzMaxim | 74:23be10c32fa3 | 215 | |
IanBenzMaxim | 75:8b627804927c | 216 | result = configureLevel(afterLevel); |
IanBenzMaxim | 74:23be10c32fa3 | 217 | if (result != OneWireMaster::Success) |
IanBenzMaxim | 74:23be10c32fa3 | 218 | { |
IanBenzMaxim | 74:23be10c32fa3 | 219 | return result; |
IanBenzMaxim | 74:23be10c32fa3 | 220 | } |
IanBenzMaxim | 74:23be10c32fa3 | 221 | |
IanBenzMaxim | 74:23be10c32fa3 | 222 | uint8_t status; |
IanBenzMaxim | 74:23be10c32fa3 | 223 | |
IanBenzMaxim | 75:8b627804927c | 224 | result = sendCommand(OwSingleBitCmd, (uint8_t)(sendRecvBit ? 0x80 : 0x00)); |
IanBenzMaxim | 74:23be10c32fa3 | 225 | |
IanBenzMaxim | 74:23be10c32fa3 | 226 | if (result == OneWireMaster::Success) |
IanBenzMaxim | 74:23be10c32fa3 | 227 | { |
IanBenzMaxim | 74:23be10c32fa3 | 228 | result = pollBusy(&status); |
IanBenzMaxim | 74:23be10c32fa3 | 229 | } |
IanBenzMaxim | 74:23be10c32fa3 | 230 | |
IanBenzMaxim | 74:23be10c32fa3 | 231 | if (result == OneWireMaster::Success) |
IanBenzMaxim | 74:23be10c32fa3 | 232 | { |
IanBenzMaxim | 78:0cbbac7f2016 | 233 | sendRecvBit = (status & Status_SBR); |
IanBenzMaxim | 74:23be10c32fa3 | 234 | } |
IanBenzMaxim | 74:23be10c32fa3 | 235 | |
IanBenzMaxim | 69:f915c4c59a69 | 236 | return result; |
j3 | 1:91e52f8ab8bf | 237 | } |
j3 | 1:91e52f8ab8bf | 238 | |
IanBenzMaxim | 75:8b627804927c | 239 | OneWireMaster::CmdResult DS248x::OWWriteByteSetLevel(uint8_t sendByte, OWLevel afterLevel) |
j3 | 1:91e52f8ab8bf | 240 | { |
j3 | 2:02d228c25fd4 | 241 | // 1-Wire Write Byte (Case B) |
j3 | 2:02d228c25fd4 | 242 | // S AD,0 [A] 1WWB [A] DD [A] Sr AD,1 [A] [Status] A [Status] A\ P |
j3 | 2:02d228c25fd4 | 243 | // \--------/ |
j3 | 2:02d228c25fd4 | 244 | // Repeat until 1WB bit has changed to 0 |
j3 | 2:02d228c25fd4 | 245 | // [] indicates from slave |
j3 | 2:02d228c25fd4 | 246 | // DD data to write |
j3 | 2:02d228c25fd4 | 247 | |
IanBenzMaxim | 74:23be10c32fa3 | 248 | OneWireMaster::CmdResult result; |
IanBenzMaxim | 74:23be10c32fa3 | 249 | |
IanBenzMaxim | 75:8b627804927c | 250 | result = configureLevel(afterLevel); |
IanBenzMaxim | 74:23be10c32fa3 | 251 | if (result != OneWireMaster::Success) |
IanBenzMaxim | 74:23be10c32fa3 | 252 | { |
IanBenzMaxim | 74:23be10c32fa3 | 253 | return result; |
IanBenzMaxim | 74:23be10c32fa3 | 254 | } |
IanBenzMaxim | 74:23be10c32fa3 | 255 | |
IanBenzMaxim | 75:8b627804927c | 256 | result = sendCommand(OwWriteByteCmd, sendByte); |
IanBenzMaxim | 74:23be10c32fa3 | 257 | if (result == OneWireMaster::Success) |
IanBenzMaxim | 74:23be10c32fa3 | 258 | { |
IanBenzMaxim | 74:23be10c32fa3 | 259 | result = pollBusy(); |
IanBenzMaxim | 74:23be10c32fa3 | 260 | } |
IanBenzMaxim | 74:23be10c32fa3 | 261 | |
IanBenzMaxim | 69:f915c4c59a69 | 262 | return result; |
j3 | 1:91e52f8ab8bf | 263 | } |
j3 | 1:91e52f8ab8bf | 264 | |
IanBenzMaxim | 75:8b627804927c | 265 | OneWireMaster::CmdResult DS248x::OWReadByteSetLevel(uint8_t & recvByte, OWLevel afterLevel) |
j3 | 1:91e52f8ab8bf | 266 | { |
IanBenzMaxim | 69:f915c4c59a69 | 267 | // 1-Wire Read Bytes (Case C) |
IanBenzMaxim | 69:f915c4c59a69 | 268 | // S AD,0 [A] 1WRB [A] Sr AD,1 [A] [Status] A [Status] A\ |
IanBenzMaxim | 69:f915c4c59a69 | 269 | // \--------/ |
IanBenzMaxim | 69:f915c4c59a69 | 270 | // Repeat until 1WB bit has changed to 0 |
IanBenzMaxim | 69:f915c4c59a69 | 271 | // Sr AD,0 [A] SRP [A] E1 [A] Sr AD,1 [A] DD A\ P |
IanBenzMaxim | 69:f915c4c59a69 | 272 | // |
IanBenzMaxim | 69:f915c4c59a69 | 273 | // [] indicates from slave |
IanBenzMaxim | 69:f915c4c59a69 | 274 | // DD data read |
IanBenzMaxim | 26:a361e3f42ba5 | 275 | |
IanBenzMaxim | 74:23be10c32fa3 | 276 | OneWireMaster::CmdResult result; |
IanBenzMaxim | 74:23be10c32fa3 | 277 | uint8_t buf; |
IanBenzMaxim | 74:23be10c32fa3 | 278 | |
IanBenzMaxim | 75:8b627804927c | 279 | result = configureLevel(afterLevel); |
IanBenzMaxim | 74:23be10c32fa3 | 280 | if (result != OneWireMaster::Success) |
IanBenzMaxim | 74:23be10c32fa3 | 281 | { |
IanBenzMaxim | 74:23be10c32fa3 | 282 | return result; |
IanBenzMaxim | 74:23be10c32fa3 | 283 | } |
IanBenzMaxim | 74:23be10c32fa3 | 284 | |
IanBenzMaxim | 75:8b627804927c | 285 | result = sendCommand(OwReadByteCmd); |
IanBenzMaxim | 69:f915c4c59a69 | 286 | |
IanBenzMaxim | 74:23be10c32fa3 | 287 | if (result == OneWireMaster::Success) |
IanBenzMaxim | 74:23be10c32fa3 | 288 | { |
IanBenzMaxim | 74:23be10c32fa3 | 289 | result = pollBusy(); |
IanBenzMaxim | 74:23be10c32fa3 | 290 | } |
IanBenzMaxim | 69:f915c4c59a69 | 291 | |
IanBenzMaxim | 74:23be10c32fa3 | 292 | if (result == OneWireMaster::Success) |
IanBenzMaxim | 74:23be10c32fa3 | 293 | { |
IanBenzMaxim | 74:23be10c32fa3 | 294 | result = readRegister(ReadDataReg, buf); |
IanBenzMaxim | 74:23be10c32fa3 | 295 | } |
IanBenzMaxim | 74:23be10c32fa3 | 296 | |
IanBenzMaxim | 74:23be10c32fa3 | 297 | if (result == OneWireMaster::Success) |
IanBenzMaxim | 74:23be10c32fa3 | 298 | { |
IanBenzMaxim | 75:8b627804927c | 299 | recvByte = buf; |
IanBenzMaxim | 74:23be10c32fa3 | 300 | } |
IanBenzMaxim | 74:23be10c32fa3 | 301 | |
IanBenzMaxim | 74:23be10c32fa3 | 302 | return result; |
j3 | 17:b646b1e3970b | 303 | } |
j3 | 17:b646b1e3970b | 304 | |
IanBenzMaxim | 75:8b627804927c | 305 | OneWireMaster::CmdResult DS248x::OWSetSpeed(OWSpeed newSpeed) |
j3 | 1:91e52f8ab8bf | 306 | { |
IanBenzMaxim | 74:23be10c32fa3 | 307 | // Requested speed is already set |
IanBenzMaxim | 75:8b627804927c | 308 | if (m_curConfig.get1WS() == (newSpeed == OverdriveSpeed)) |
IanBenzMaxim | 74:23be10c32fa3 | 309 | { |
IanBenzMaxim | 74:23be10c32fa3 | 310 | return OneWireMaster::Success; |
IanBenzMaxim | 74:23be10c32fa3 | 311 | } |
j3 | 2:02d228c25fd4 | 312 | |
IanBenzMaxim | 74:23be10c32fa3 | 313 | // set the speed |
IanBenzMaxim | 74:23be10c32fa3 | 314 | Config newConfig = m_curConfig; |
IanBenzMaxim | 75:8b627804927c | 315 | newConfig.set1WS(newSpeed == OverdriveSpeed); |
IanBenzMaxim | 74:23be10c32fa3 | 316 | |
IanBenzMaxim | 74:23be10c32fa3 | 317 | // write the new config |
IanBenzMaxim | 74:23be10c32fa3 | 318 | return writeConfig(newConfig, true); |
j3 | 1:91e52f8ab8bf | 319 | } |
j3 | 1:91e52f8ab8bf | 320 | |
IanBenzMaxim | 75:8b627804927c | 321 | OneWireMaster::CmdResult DS248x::OWSetLevel(OWLevel newLevel) |
j3 | 1:91e52f8ab8bf | 322 | { |
IanBenzMaxim | 75:8b627804927c | 323 | if (newLevel == StrongLevel) |
IanBenzMaxim | 73:2cecc1372acc | 324 | { |
IanBenzMaxim | 69:f915c4c59a69 | 325 | return OneWireMaster::OperationFailure; |
IanBenzMaxim | 74:23be10c32fa3 | 326 | } |
IanBenzMaxim | 74:23be10c32fa3 | 327 | |
IanBenzMaxim | 75:8b627804927c | 328 | return configureLevel(newLevel); |
IanBenzMaxim | 21:00c94aeb533e | 329 | } |
IanBenzMaxim | 21:00c94aeb533e | 330 | |
IanBenzMaxim | 73:2cecc1372acc | 331 | OneWireMaster::CmdResult DS248x::writeConfig(const Config & config, bool verify) |
j3 | 6:1faafa0b3cd7 | 332 | { |
IanBenzMaxim | 74:23be10c32fa3 | 333 | uint8_t configBuf; |
IanBenzMaxim | 74:23be10c32fa3 | 334 | OneWireMaster::CmdResult result; |
IanBenzMaxim | 74:23be10c32fa3 | 335 | |
IanBenzMaxim | 74:23be10c32fa3 | 336 | configBuf = config.writeByte(); |
IanBenzMaxim | 75:8b627804927c | 337 | result = sendCommand(WriteDeviceConfigCmd, configBuf); |
IanBenzMaxim | 74:23be10c32fa3 | 338 | if (verify) |
IanBenzMaxim | 74:23be10c32fa3 | 339 | { |
IanBenzMaxim | 74:23be10c32fa3 | 340 | if (result == OneWireMaster::Success) |
IanBenzMaxim | 74:23be10c32fa3 | 341 | { |
IanBenzMaxim | 74:23be10c32fa3 | 342 | result = readRegister(ConfigReg, configBuf); |
IanBenzMaxim | 74:23be10c32fa3 | 343 | } |
IanBenzMaxim | 74:23be10c32fa3 | 344 | if (result == OneWireMaster::Success) |
IanBenzMaxim | 74:23be10c32fa3 | 345 | { |
IanBenzMaxim | 74:23be10c32fa3 | 346 | if (configBuf != config.readByte()) |
IanBenzMaxim | 74:23be10c32fa3 | 347 | { |
IanBenzMaxim | 74:23be10c32fa3 | 348 | result = OneWireMaster::OperationFailure; |
IanBenzMaxim | 74:23be10c32fa3 | 349 | } |
IanBenzMaxim | 74:23be10c32fa3 | 350 | } |
IanBenzMaxim | 74:23be10c32fa3 | 351 | } |
IanBenzMaxim | 74:23be10c32fa3 | 352 | |
IanBenzMaxim | 69:f915c4c59a69 | 353 | if (result == OneWireMaster::Success) |
IanBenzMaxim | 69:f915c4c59a69 | 354 | { |
IanBenzMaxim | 74:23be10c32fa3 | 355 | m_curConfig = config; |
IanBenzMaxim | 69:f915c4c59a69 | 356 | } |
IanBenzMaxim | 69:f915c4c59a69 | 357 | |
IanBenzMaxim | 74:23be10c32fa3 | 358 | return result; |
IanBenzMaxim | 69:f915c4c59a69 | 359 | } |
IanBenzMaxim | 69:f915c4c59a69 | 360 | |
IanBenzMaxim | 73:2cecc1372acc | 361 | OneWireMaster::CmdResult DS248x::readRegister(Register reg, uint8_t & buf, bool skipSetPointer) const |
IanBenzMaxim | 69:f915c4c59a69 | 362 | { |
IanBenzMaxim | 69:f915c4c59a69 | 363 | CmdResult result; |
IanBenzMaxim | 75:8b627804927c | 364 | result = sendCommand(SetReadPointerCmd, reg); |
IanBenzMaxim | 69:f915c4c59a69 | 365 | if (result == Success) |
IanBenzMaxim | 69:f915c4c59a69 | 366 | { |
j3 | 91:e80108bc870a | 367 | if (m_i2c_bus.read(m_adrs, reinterpret_cast<char *>(&buf), 1) != I2C_READ_OK) |
IanBenzMaxim | 73:2cecc1372acc | 368 | { |
IanBenzMaxim | 69:f915c4c59a69 | 369 | result = CommunicationReadError; |
IanBenzMaxim | 74:23be10c32fa3 | 370 | } |
IanBenzMaxim | 69:f915c4c59a69 | 371 | } |
IanBenzMaxim | 69:f915c4c59a69 | 372 | return result; |
IanBenzMaxim | 69:f915c4c59a69 | 373 | } |
IanBenzMaxim | 69:f915c4c59a69 | 374 | |
IanBenzMaxim | 73:2cecc1372acc | 375 | OneWireMaster::CmdResult DS248x::pollBusy(uint8_t * pStatus) |
IanBenzMaxim | 69:f915c4c59a69 | 376 | { |
IanBenzMaxim | 74:23be10c32fa3 | 377 | const unsigned int pollLimit = 200; |
IanBenzMaxim | 74:23be10c32fa3 | 378 | |
IanBenzMaxim | 74:23be10c32fa3 | 379 | OneWireMaster::CmdResult result; |
IanBenzMaxim | 74:23be10c32fa3 | 380 | uint8_t status; |
IanBenzMaxim | 74:23be10c32fa3 | 381 | unsigned int pollCount = 0; |
IanBenzMaxim | 69:f915c4c59a69 | 382 | |
IanBenzMaxim | 74:23be10c32fa3 | 383 | do |
IanBenzMaxim | 74:23be10c32fa3 | 384 | { |
IanBenzMaxim | 74:23be10c32fa3 | 385 | result = readRegister(StatusReg, status, true); |
IanBenzMaxim | 74:23be10c32fa3 | 386 | if (result != OneWireMaster::Success) |
IanBenzMaxim | 74:23be10c32fa3 | 387 | { |
IanBenzMaxim | 74:23be10c32fa3 | 388 | return result; |
IanBenzMaxim | 74:23be10c32fa3 | 389 | } |
IanBenzMaxim | 74:23be10c32fa3 | 390 | if (pStatus != NULL) |
IanBenzMaxim | 74:23be10c32fa3 | 391 | { |
IanBenzMaxim | 74:23be10c32fa3 | 392 | *pStatus = status; |
IanBenzMaxim | 74:23be10c32fa3 | 393 | } |
IanBenzMaxim | 74:23be10c32fa3 | 394 | if (pollCount++ >= pollLimit) |
IanBenzMaxim | 74:23be10c32fa3 | 395 | { |
IanBenzMaxim | 74:23be10c32fa3 | 396 | return OneWireMaster::TimeoutError; |
IanBenzMaxim | 74:23be10c32fa3 | 397 | } |
IanBenzMaxim | 78:0cbbac7f2016 | 398 | } while (status & Status_1WB); |
IanBenzMaxim | 69:f915c4c59a69 | 399 | |
IanBenzMaxim | 74:23be10c32fa3 | 400 | return OneWireMaster::Success; |
IanBenzMaxim | 69:f915c4c59a69 | 401 | } |
IanBenzMaxim | 69:f915c4c59a69 | 402 | |
IanBenzMaxim | 73:2cecc1372acc | 403 | OneWireMaster::CmdResult DS248x::configureLevel(OWLevel level) |
IanBenzMaxim | 69:f915c4c59a69 | 404 | { |
IanBenzMaxim | 69:f915c4c59a69 | 405 | OneWireMaster::CmdResult result; |
IanBenzMaxim | 75:8b627804927c | 406 | if (m_curConfig.getSPU() != (level == StrongLevel)) |
IanBenzMaxim | 69:f915c4c59a69 | 407 | { |
IanBenzMaxim | 69:f915c4c59a69 | 408 | Config newConfig = m_curConfig; |
IanBenzMaxim | 75:8b627804927c | 409 | newConfig.setSPU(level == StrongLevel); |
IanBenzMaxim | 69:f915c4c59a69 | 410 | result = writeConfig(newConfig, true); |
IanBenzMaxim | 69:f915c4c59a69 | 411 | } |
IanBenzMaxim | 69:f915c4c59a69 | 412 | else |
IanBenzMaxim | 69:f915c4c59a69 | 413 | { |
IanBenzMaxim | 69:f915c4c59a69 | 414 | result = OneWireMaster::Success; |
IanBenzMaxim | 69:f915c4c59a69 | 415 | } |
IanBenzMaxim | 69:f915c4c59a69 | 416 | return result; |
IanBenzMaxim | 69:f915c4c59a69 | 417 | } |
IanBenzMaxim | 69:f915c4c59a69 | 418 | |
IanBenzMaxim | 75:8b627804927c | 419 | OneWireMaster::CmdResult DS248x::sendCommand(Command cmd) const |
IanBenzMaxim | 69:f915c4c59a69 | 420 | { |
IanBenzMaxim | 69:f915c4c59a69 | 421 | CmdResult result; |
j3 | 91:e80108bc870a | 422 | if (m_i2c_bus.write(m_adrs, reinterpret_cast<const char *>(&cmd), 1) == I2C_WRITE_OK) |
IanBenzMaxim | 73:2cecc1372acc | 423 | { |
IanBenzMaxim | 69:f915c4c59a69 | 424 | result = Success; |
IanBenzMaxim | 74:23be10c32fa3 | 425 | } |
IanBenzMaxim | 69:f915c4c59a69 | 426 | else |
IanBenzMaxim | 73:2cecc1372acc | 427 | { |
IanBenzMaxim | 69:f915c4c59a69 | 428 | result = CommunicationWriteError; |
IanBenzMaxim | 74:23be10c32fa3 | 429 | } |
IanBenzMaxim | 69:f915c4c59a69 | 430 | return result; |
IanBenzMaxim | 69:f915c4c59a69 | 431 | } |
IanBenzMaxim | 69:f915c4c59a69 | 432 | |
IanBenzMaxim | 75:8b627804927c | 433 | OneWireMaster::CmdResult DS248x::sendCommand(Command cmd, uint8_t param) const |
IanBenzMaxim | 69:f915c4c59a69 | 434 | { |
IanBenzMaxim | 69:f915c4c59a69 | 435 | CmdResult result; |
IanBenzMaxim | 79:7f22823a5a2d | 436 | uint8_t buf[2] = { cmd, param }; |
j3 | 91:e80108bc870a | 437 | if (m_i2c_bus.write(m_adrs, reinterpret_cast<const char *>(buf), 2) == I2C_WRITE_OK) |
IanBenzMaxim | 73:2cecc1372acc | 438 | { |
IanBenzMaxim | 69:f915c4c59a69 | 439 | result = Success; |
IanBenzMaxim | 74:23be10c32fa3 | 440 | } |
IanBenzMaxim | 69:f915c4c59a69 | 441 | else |
IanBenzMaxim | 73:2cecc1372acc | 442 | { |
IanBenzMaxim | 69:f915c4c59a69 | 443 | result = CommunicationWriteError; |
IanBenzMaxim | 74:23be10c32fa3 | 444 | } |
IanBenzMaxim | 69:f915c4c59a69 | 445 | return result; |
IanBenzMaxim | 69:f915c4c59a69 | 446 | } |