Mike Fruge / OneWire

Implementation of 1-Wire with added Alarm Search Functionality

Dependents:   Max32630_One_Wire_Interface

Masters/DS248x/DS248x.cpp@75:8b627804927c, 2016-05-13 (annotated)

Committer:
IanBenzMaxim
Date:
Fri May 13 14:52:50 2016 -0500
Revision:
75:8b627804927c
Parent:
74:23be10c32fa3
Child:
76:84e6c4994e29
Code cleanup.

Who changed what in which revision?

UserRevisionLine numberNew 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 73:2cecc1372acc 36 using OneWire::Masters::OneWireMaster;
IanBenzMaxim 73:2cecc1372acc 37 using OneWire::Masters::DS248x;
j3 1:91e52f8ab8bf 38
IanBenzMaxim 69:f915c4c59a69 39 enum DS248X_STATUS_BITS
IanBenzMaxim 69:f915c4c59a69 40 {
IanBenzMaxim 74:23be10c32fa3 41 STATUS_1WB = 0x01,
IanBenzMaxim 69:f915c4c59a69 42 STATUS_PPD = 0x02,
IanBenzMaxim 69:f915c4c59a69 43 STATUS_SD = 0x04,
IanBenzMaxim 69:f915c4c59a69 44 STATUS_LL = 0x08,
IanBenzMaxim 69:f915c4c59a69 45 STATUS_RST = 0x10,
IanBenzMaxim 69:f915c4c59a69 46 STATUS_SBR = 0x20,
IanBenzMaxim 69:f915c4c59a69 47 STATUS_TSB = 0x40,
IanBenzMaxim 69:f915c4c59a69 48 STATUS_DIR = 0x80
IanBenzMaxim 69:f915c4c59a69 49 };
IanBenzMaxim 69:f915c4c59a69 50
IanBenzMaxim 69:f915c4c59a69 51 static const int I2C_WRITE_OK = 0;
IanBenzMaxim 69:f915c4c59a69 52 static const int I2C_READ_OK = 0;
IanBenzMaxim 69:f915c4c59a69 53
IanBenzMaxim 73:2cecc1372acc 54 uint8_t DS248x::Config::readByte() const
IanBenzMaxim 69:f915c4c59a69 55 {
IanBenzMaxim 74:23be10c32fa3 56 uint8_t config = 0;
IanBenzMaxim 74:23be10c32fa3 57 if (get1WS())
IanBenzMaxim 74:23be10c32fa3 58 {
IanBenzMaxim 74:23be10c32fa3 59 config |= 0x08;
IanBenzMaxim 74:23be10c32fa3 60 }
IanBenzMaxim 74:23be10c32fa3 61 if (getSPU())
IanBenzMaxim 74:23be10c32fa3 62 {
IanBenzMaxim 74:23be10c32fa3 63 config |= 0x04;
IanBenzMaxim 74:23be10c32fa3 64 }
IanBenzMaxim 74:23be10c32fa3 65 if (getPDN())
IanBenzMaxim 74:23be10c32fa3 66 {
IanBenzMaxim 74:23be10c32fa3 67 config |= 0x02;
IanBenzMaxim 74:23be10c32fa3 68 }
IanBenzMaxim 74:23be10c32fa3 69 if (getAPU())
IanBenzMaxim 74:23be10c32fa3 70 {
IanBenzMaxim 74:23be10c32fa3 71 config |= 0x01;
IanBenzMaxim 74:23be10c32fa3 72 }
IanBenzMaxim 74:23be10c32fa3 73 return config;
IanBenzMaxim 69:f915c4c59a69 74 }
IanBenzMaxim 69:f915c4c59a69 75
IanBenzMaxim 73:2cecc1372acc 76 uint8_t DS248x::Config::writeByte() const
IanBenzMaxim 69:f915c4c59a69 77 {
IanBenzMaxim 74:23be10c32fa3 78 uint8_t config = readByte();
IanBenzMaxim 74:23be10c32fa3 79 return ((~config << 4) | config);
IanBenzMaxim 69:f915c4c59a69 80 }
IanBenzMaxim 69:f915c4c59a69 81
IanBenzMaxim 73:2cecc1372acc 82 void DS248x::Config::reset()
IanBenzMaxim 69:f915c4c59a69 83 {
IanBenzMaxim 74:23be10c32fa3 84 set1WS(false);
IanBenzMaxim 74:23be10c32fa3 85 setSPU(false);
IanBenzMaxim 74:23be10c32fa3 86 setPDN(false);
IanBenzMaxim 74:23be10c32fa3 87 setAPU(true);
IanBenzMaxim 69:f915c4c59a69 88 }
IanBenzMaxim 69:f915c4c59a69 89
IanBenzMaxim 73:2cecc1372acc 90 DS248x::DS248x(mbed::I2C & i2c_bus, uint8_t adrs)
IanBenzMaxim 75:8b627804927c 91 :m_p_i2c_bus(&i2c_bus), m_adrs(adrs), m_i2c_owner(false)
IanBenzMaxim 73:2cecc1372acc 92 {
IanBenzMaxim 69:f915c4c59a69 93
j3 1:91e52f8ab8bf 94 }
j3 1:91e52f8ab8bf 95
IanBenzMaxim 73:2cecc1372acc 96 DS248x::DS248x(PinName sda, PinName scl, uint8_t adrs)
IanBenzMaxim 75:8b627804927c 97 : m_p_i2c_bus(new mbed::I2C(sda, scl)), m_adrs(adrs), m_i2c_owner(true)
IanBenzMaxim 73:2cecc1372acc 98 {
j3 1:91e52f8ab8bf 99
j3 1:91e52f8ab8bf 100 }
j3 1:91e52f8ab8bf 101
IanBenzMaxim 73:2cecc1372acc 102 DS248x::~DS248x()
j3 1:91e52f8ab8bf 103 {
IanBenzMaxim 75:8b627804927c 104 if (m_i2c_owner)
j3 1:91e52f8ab8bf 105 {
IanBenzMaxim 75:8b627804927c 106 delete m_p_i2c_bus;
j3 1:91e52f8ab8bf 107 }
j3 1:91e52f8ab8bf 108 }
j3 1:91e52f8ab8bf 109
IanBenzMaxim 73:2cecc1372acc 110 OneWireMaster::CmdResult DS248x::OWInitMaster(void)
j3 14:7b2886a50321 111 {
IanBenzMaxim 69:f915c4c59a69 112 OneWireMaster::CmdResult result;
j3 14:7b2886a50321 113
IanBenzMaxim 69:f915c4c59a69 114 // reset DS2465
j3 17:b646b1e3970b 115 result = reset();
IanBenzMaxim 69:f915c4c59a69 116 if (result != OneWireMaster::Success)
IanBenzMaxim 74:23be10c32fa3 117 {
IanBenzMaxim 74:23be10c32fa3 118 return result;
IanBenzMaxim 74:23be10c32fa3 119 }
IanBenzMaxim 69:f915c4c59a69 120
IanBenzMaxim 69:f915c4c59a69 121 // write the default configuration setup
IanBenzMaxim 69:f915c4c59a69 122 Config defaultConfig;
IanBenzMaxim 69:f915c4c59a69 123 result = writeConfig(defaultConfig, true);
j3 17:b646b1e3970b 124 return result;
j3 2:02d228c25fd4 125 }
j3 2:02d228c25fd4 126
IanBenzMaxim 73:2cecc1372acc 127 OneWireMaster::CmdResult DS248x::reset(void)
IanBenzMaxim 74:23be10c32fa3 128 {
j3 2:02d228c25fd4 129 // Device Reset
j3 2:02d228c25fd4 130 // S AD,0 [A] DRST [A] Sr AD,1 [A] [SS] A\ P
j3 2:02d228c25fd4 131 // [] indicates from slave
j3 2:02d228c25fd4 132 // SS status byte to read to verify state
IanBenzMaxim 74:23be10c32fa3 133
IanBenzMaxim 74:23be10c32fa3 134 OneWireMaster::CmdResult result;
IanBenzMaxim 74:23be10c32fa3 135 uint8_t buf;
IanBenzMaxim 74:23be10c32fa3 136
IanBenzMaxim 75:8b627804927c 137 result = sendCommand(DeviceResetCmd);
IanBenzMaxim 74:23be10c32fa3 138
IanBenzMaxim 74:23be10c32fa3 139 if (result == OneWireMaster::Success)
IanBenzMaxim 74:23be10c32fa3 140 {
IanBenzMaxim 74:23be10c32fa3 141 result = readRegister(StatusReg, buf, true);
IanBenzMaxim 74:23be10c32fa3 142 }
IanBenzMaxim 69:f915c4c59a69 143
IanBenzMaxim 74:23be10c32fa3 144 if (result == OneWireMaster::Success)
IanBenzMaxim 74:23be10c32fa3 145 {
IanBenzMaxim 74:23be10c32fa3 146 if ((buf & 0xF7) != 0x10)
IanBenzMaxim 74:23be10c32fa3 147 {
IanBenzMaxim 74:23be10c32fa3 148 result = OneWireMaster::OperationFailure;
IanBenzMaxim 74:23be10c32fa3 149 }
IanBenzMaxim 74:23be10c32fa3 150 }
IanBenzMaxim 69:f915c4c59a69 151
IanBenzMaxim 74:23be10c32fa3 152 if (result == OneWireMaster::Success)
IanBenzMaxim 74:23be10c32fa3 153 {
IanBenzMaxim 74:23be10c32fa3 154 OWReset(); // do a command to get 1-Wire master reset out of holding state
IanBenzMaxim 74:23be10c32fa3 155 }
IanBenzMaxim 74:23be10c32fa3 156
IanBenzMaxim 74:23be10c32fa3 157 return result;
j3 2:02d228c25fd4 158 }
j3 2:02d228c25fd4 159
IanBenzMaxim 73:2cecc1372acc 160 OneWireMaster::CmdResult DS248x::selectChannel(uint8_t channel)
j3 2:02d228c25fd4 161 {
j3 23:e8e403d61359 162 OneWireMaster::CmdResult result;
IanBenzMaxim 69:f915c4c59a69 163 uint8_t ch, ch_read;
IanBenzMaxim 74:23be10c32fa3 164
j3 2:02d228c25fd4 165 // Channel Select (Case A)
j3 2:02d228c25fd4 166 // S AD,0 [A] CHSL [A] CC [A] Sr AD,1 [A] [RR] A\ P
j3 2:02d228c25fd4 167 // [] indicates from slave
j3 2:02d228c25fd4 168 // CC channel value
j3 2:02d228c25fd4 169 // RR channel read back
IanBenzMaxim 74:23be10c32fa3 170
j3 2:02d228c25fd4 171 switch (channel)
j3 2:02d228c25fd4 172 {
IanBenzMaxim 74:23be10c32fa3 173 default:
IanBenzMaxim 74:23be10c32fa3 174 case 0:
IanBenzMaxim 74:23be10c32fa3 175 ch = 0xF0;
IanBenzMaxim 74:23be10c32fa3 176 ch_read = 0xB8;
IanBenzMaxim 74:23be10c32fa3 177 break;
IanBenzMaxim 74:23be10c32fa3 178 case 1:
IanBenzMaxim 74:23be10c32fa3 179 ch = 0xE1;
IanBenzMaxim 74:23be10c32fa3 180 ch_read = 0xB1;
IanBenzMaxim 74:23be10c32fa3 181 break;
IanBenzMaxim 74:23be10c32fa3 182 case 2:
IanBenzMaxim 74:23be10c32fa3 183 ch = 0xD2;
IanBenzMaxim 74:23be10c32fa3 184 ch_read = 0xAA;
IanBenzMaxim 74:23be10c32fa3 185 break;
IanBenzMaxim 74:23be10c32fa3 186 case 3:
IanBenzMaxim 74:23be10c32fa3 187 ch = 0xC3;
IanBenzMaxim 74:23be10c32fa3 188 ch_read = 0xA3;
IanBenzMaxim 74:23be10c32fa3 189 break;
IanBenzMaxim 74:23be10c32fa3 190 case 4:
IanBenzMaxim 74:23be10c32fa3 191 ch = 0xB4;
IanBenzMaxim 74:23be10c32fa3 192 ch_read = 0x9C;
IanBenzMaxim 74:23be10c32fa3 193 break;
IanBenzMaxim 74:23be10c32fa3 194 case 5:
IanBenzMaxim 74:23be10c32fa3 195 ch = 0xA5;
IanBenzMaxim 74:23be10c32fa3 196 ch_read = 0x95;
IanBenzMaxim 74:23be10c32fa3 197 break;
IanBenzMaxim 74:23be10c32fa3 198 case 6:
IanBenzMaxim 74:23be10c32fa3 199 ch = 0x96;
IanBenzMaxim 74:23be10c32fa3 200 ch_read = 0x8E;
IanBenzMaxim 74:23be10c32fa3 201 break;
IanBenzMaxim 74:23be10c32fa3 202 case 7:
IanBenzMaxim 74:23be10c32fa3 203 ch = 0x87;
IanBenzMaxim 74:23be10c32fa3 204 ch_read = 0x87;
IanBenzMaxim 74:23be10c32fa3 205 break;
j3 2:02d228c25fd4 206 };
IanBenzMaxim 74:23be10c32fa3 207
IanBenzMaxim 75:8b627804927c 208 result = sendCommand(ChannelSelectCmd, ch);
IanBenzMaxim 69:f915c4c59a69 209 if (result == OneWireMaster::Success)
j3 17:b646b1e3970b 210 {
IanBenzMaxim 73:2cecc1372acc 211 result = readRegister(ChannelSelectReg, ch, true);
IanBenzMaxim 69:f915c4c59a69 212 if (result == OneWireMaster::Success)
j3 17:b646b1e3970b 213 {
j3 17:b646b1e3970b 214 // check for failure due to incorrect read back of channel
IanBenzMaxim 69:f915c4c59a69 215 if (ch != ch_read)
j3 17:b646b1e3970b 216 {
j3 23:e8e403d61359 217 result = OneWireMaster::OperationFailure;
j3 17:b646b1e3970b 218 }
j3 2:02d228c25fd4 219 }
j3 2:02d228c25fd4 220 }
IanBenzMaxim 74:23be10c32fa3 221
j3 17:b646b1e3970b 222 return result;
j3 1:91e52f8ab8bf 223 }
j3 1:91e52f8ab8bf 224
IanBenzMaxim 73:2cecc1372acc 225 OneWireMaster::CmdResult DS248x::adjustOwPort(OwAdjustParam param, uint8_t val)
j3 1:91e52f8ab8bf 226 {
j3 23:e8e403d61359 227 OneWireMaster::CmdResult result;
IanBenzMaxim 74:23be10c32fa3 228
IanBenzMaxim 69:f915c4c59a69 229 uint8_t read_port_config;
IanBenzMaxim 69:f915c4c59a69 230 uint8_t control_byte;
IanBenzMaxim 69:f915c4c59a69 231
IanBenzMaxim 69:f915c4c59a69 232 control_byte = (((param & 0x0F) << 4) | (val & 0x0F));
IanBenzMaxim 74:23be10c32fa3 233
IanBenzMaxim 75:8b627804927c 234 result = sendCommand(AdjustOwPortCmd, control_byte);
IanBenzMaxim 69:f915c4c59a69 235 if (result != Success)
IanBenzMaxim 74:23be10c32fa3 236 {
IanBenzMaxim 26:a361e3f42ba5 237 return result;
IanBenzMaxim 74:23be10c32fa3 238 }
IanBenzMaxim 74:23be10c32fa3 239
IanBenzMaxim 73:2cecc1372acc 240 result = readRegister(PortConfigReg, read_port_config, true);
IanBenzMaxim 69:f915c4c59a69 241 if (result != Success)
IanBenzMaxim 74:23be10c32fa3 242 {
IanBenzMaxim 69:f915c4c59a69 243 return result;
IanBenzMaxim 74:23be10c32fa3 244 }
IanBenzMaxim 74:23be10c32fa3 245
IanBenzMaxim 74:23be10c32fa3 246 if ((control_byte & 0x0F) != read_port_config)
IanBenzMaxim 74:23be10c32fa3 247 {
IanBenzMaxim 69:f915c4c59a69 248 result = OneWireMaster::OperationFailure;
IanBenzMaxim 74:23be10c32fa3 249 }
IanBenzMaxim 74:23be10c32fa3 250
IanBenzMaxim 69:f915c4c59a69 251 return result;
IanBenzMaxim 69:f915c4c59a69 252 }
IanBenzMaxim 69:f915c4c59a69 253
IanBenzMaxim 75:8b627804927c 254 OneWireMaster::CmdResult DS248x::OWTriplet(SearchDirection & searchDirection, uint8_t & sbr, uint8_t & tsb)
IanBenzMaxim 69:f915c4c59a69 255 {
IanBenzMaxim 69:f915c4c59a69 256 // 1-Wire Triplet (Case B)
IanBenzMaxim 69:f915c4c59a69 257 // S AD,0 [A] 1WT [A] SS [A] Sr AD,1 [A] [Status] A [Status] A\ P
IanBenzMaxim 69:f915c4c59a69 258 // \--------/
IanBenzMaxim 69:f915c4c59a69 259 // Repeat until 1WB bit has changed to 0
IanBenzMaxim 69:f915c4c59a69 260 // [] indicates from slave
IanBenzMaxim 69:f915c4c59a69 261 // SS indicates byte containing search direction bit value in msbit
IanBenzMaxim 69:f915c4c59a69 262
IanBenzMaxim 74:23be10c32fa3 263 OneWireMaster::CmdResult result;
IanBenzMaxim 75:8b627804927c 264 result = sendCommand(OwTripletCmd, (uint8_t)((searchDirection == WriteOne) ? 0x80 : 0x00));
IanBenzMaxim 69:f915c4c59a69 265 if (result == OneWireMaster::Success)
IanBenzMaxim 69:f915c4c59a69 266 {
IanBenzMaxim 74:23be10c32fa3 267 uint8_t status;
IanBenzMaxim 74:23be10c32fa3 268 result = pollBusy(&status);
IanBenzMaxim 74:23be10c32fa3 269 if (result == OneWireMaster::Success)
IanBenzMaxim 74:23be10c32fa3 270 {
IanBenzMaxim 74:23be10c32fa3 271 // check bit results in status byte
IanBenzMaxim 74:23be10c32fa3 272 sbr = ((status & STATUS_SBR) == STATUS_SBR);
IanBenzMaxim 74:23be10c32fa3 273 tsb = ((status & STATUS_TSB) == STATUS_TSB);
IanBenzMaxim 75:8b627804927c 274 searchDirection = ((status & STATUS_DIR) == STATUS_DIR) ? WriteOne : WriteZero;
IanBenzMaxim 74:23be10c32fa3 275 }
IanBenzMaxim 69:f915c4c59a69 276 }
IanBenzMaxim 74:23be10c32fa3 277 return result;
IanBenzMaxim 69:f915c4c59a69 278 }
IanBenzMaxim 69:f915c4c59a69 279
IanBenzMaxim 75:8b627804927c 280 OneWireMaster::CmdResult DS248x::OWReset()
IanBenzMaxim 69:f915c4c59a69 281 {
IanBenzMaxim 69:f915c4c59a69 282 // 1-Wire reset (Case B)
IanBenzMaxim 69:f915c4c59a69 283 // S AD,0 [A] 1WRS [A] Sr AD,1 [A] [Status] A [Status] A\ P
IanBenzMaxim 69:f915c4c59a69 284 // \--------/
IanBenzMaxim 69:f915c4c59a69 285 // Repeat until 1WB bit has changed to 0
IanBenzMaxim 69:f915c4c59a69 286 // [] indicates from slave
IanBenzMaxim 69:f915c4c59a69 287
IanBenzMaxim 74:23be10c32fa3 288 OneWireMaster::CmdResult result;
IanBenzMaxim 74:23be10c32fa3 289 uint8_t buf;
IanBenzMaxim 74:23be10c32fa3 290
IanBenzMaxim 75:8b627804927c 291 result = sendCommand(OwResetCmd);
IanBenzMaxim 74:23be10c32fa3 292
IanBenzMaxim 74:23be10c32fa3 293 if (result == OneWireMaster::Success)
IanBenzMaxim 74:23be10c32fa3 294 {
IanBenzMaxim 74:23be10c32fa3 295 result = pollBusy(&buf);
IanBenzMaxim 74:23be10c32fa3 296 }
IanBenzMaxim 69:f915c4c59a69 297
IanBenzMaxim 74:23be10c32fa3 298 if (result == OneWireMaster::Success)
IanBenzMaxim 74:23be10c32fa3 299 {
IanBenzMaxim 74:23be10c32fa3 300 // check for presence detect
IanBenzMaxim 74:23be10c32fa3 301 if ((buf & STATUS_PPD) != STATUS_PPD)
IanBenzMaxim 74:23be10c32fa3 302 {
IanBenzMaxim 74:23be10c32fa3 303 result = OneWireMaster::OperationFailure;
IanBenzMaxim 74:23be10c32fa3 304 }
IanBenzMaxim 74:23be10c32fa3 305 }
IanBenzMaxim 69:f915c4c59a69 306
IanBenzMaxim 74:23be10c32fa3 307 return result;
IanBenzMaxim 69:f915c4c59a69 308 }
IanBenzMaxim 69:f915c4c59a69 309
IanBenzMaxim 75:8b627804927c 310 OneWireMaster::CmdResult DS248x::OWTouchBitSetLevel(uint8_t & sendRecvBit, OWLevel afterLevel)
IanBenzMaxim 69:f915c4c59a69 311 {
j3 2:02d228c25fd4 312 // 1-Wire bit (Case B)
j3 2:02d228c25fd4 313 // S AD,0 [A] 1WSB [A] BB [A] Sr AD,1 [A] [Status] A [Status] A\ P
j3 2:02d228c25fd4 314 // \--------/
j3 2:02d228c25fd4 315 // Repeat until 1WB bit has changed to 0
j3 2:02d228c25fd4 316 // [] indicates from slave
j3 2:02d228c25fd4 317 // BB indicates byte containing bit value in msbit
j3 2:02d228c25fd4 318
IanBenzMaxim 74:23be10c32fa3 319 OneWireMaster::CmdResult result;
IanBenzMaxim 74:23be10c32fa3 320
IanBenzMaxim 75:8b627804927c 321 result = configureLevel(afterLevel);
IanBenzMaxim 74:23be10c32fa3 322 if (result != OneWireMaster::Success)
IanBenzMaxim 74:23be10c32fa3 323 {
IanBenzMaxim 74:23be10c32fa3 324 return result;
IanBenzMaxim 74:23be10c32fa3 325 }
IanBenzMaxim 74:23be10c32fa3 326
IanBenzMaxim 74:23be10c32fa3 327 uint8_t status;
IanBenzMaxim 74:23be10c32fa3 328
IanBenzMaxim 75:8b627804927c 329 result = sendCommand(OwSingleBitCmd, (uint8_t)(sendRecvBit ? 0x80 : 0x00));
IanBenzMaxim 74:23be10c32fa3 330
IanBenzMaxim 74:23be10c32fa3 331 if (result == OneWireMaster::Success)
IanBenzMaxim 74:23be10c32fa3 332 {
IanBenzMaxim 74:23be10c32fa3 333 result = pollBusy(&status);
IanBenzMaxim 74:23be10c32fa3 334 }
IanBenzMaxim 74:23be10c32fa3 335
IanBenzMaxim 74:23be10c32fa3 336 if (result == OneWireMaster::Success)
IanBenzMaxim 74:23be10c32fa3 337 {
IanBenzMaxim 75:8b627804927c 338 sendRecvBit = (status & STATUS_SBR);
IanBenzMaxim 74:23be10c32fa3 339 }
IanBenzMaxim 74:23be10c32fa3 340
IanBenzMaxim 69:f915c4c59a69 341 return result;
j3 1:91e52f8ab8bf 342 }
j3 1:91e52f8ab8bf 343
IanBenzMaxim 75:8b627804927c 344 OneWireMaster::CmdResult DS248x::OWWriteByteSetLevel(uint8_t sendByte, OWLevel afterLevel)
j3 1:91e52f8ab8bf 345 {
j3 2:02d228c25fd4 346 // 1-Wire Write Byte (Case B)
j3 2:02d228c25fd4 347 // S AD,0 [A] 1WWB [A] DD [A] Sr AD,1 [A] [Status] A [Status] A\ P
j3 2:02d228c25fd4 348 // \--------/
j3 2:02d228c25fd4 349 // Repeat until 1WB bit has changed to 0
j3 2:02d228c25fd4 350 // [] indicates from slave
j3 2:02d228c25fd4 351 // DD data to write
j3 2:02d228c25fd4 352
IanBenzMaxim 74:23be10c32fa3 353 OneWireMaster::CmdResult result;
IanBenzMaxim 74:23be10c32fa3 354
IanBenzMaxim 75:8b627804927c 355 result = configureLevel(afterLevel);
IanBenzMaxim 74:23be10c32fa3 356 if (result != OneWireMaster::Success)
IanBenzMaxim 74:23be10c32fa3 357 {
IanBenzMaxim 74:23be10c32fa3 358 return result;
IanBenzMaxim 74:23be10c32fa3 359 }
IanBenzMaxim 74:23be10c32fa3 360
IanBenzMaxim 75:8b627804927c 361 result = sendCommand(OwWriteByteCmd, sendByte);
IanBenzMaxim 74:23be10c32fa3 362 if (result == OneWireMaster::Success)
IanBenzMaxim 74:23be10c32fa3 363 {
IanBenzMaxim 74:23be10c32fa3 364 result = pollBusy();
IanBenzMaxim 74:23be10c32fa3 365 }
IanBenzMaxim 74:23be10c32fa3 366
IanBenzMaxim 69:f915c4c59a69 367 return result;
j3 1:91e52f8ab8bf 368 }
j3 1:91e52f8ab8bf 369
IanBenzMaxim 75:8b627804927c 370 OneWireMaster::CmdResult DS248x::OWReadByteSetLevel(uint8_t & recvByte, OWLevel afterLevel)
j3 1:91e52f8ab8bf 371 {
IanBenzMaxim 69:f915c4c59a69 372 // 1-Wire Read Bytes (Case C)
IanBenzMaxim 69:f915c4c59a69 373 // S AD,0 [A] 1WRB [A] Sr AD,1 [A] [Status] A [Status] A\
IanBenzMaxim 69:f915c4c59a69 374 // \--------/
IanBenzMaxim 69:f915c4c59a69 375 // Repeat until 1WB bit has changed to 0
IanBenzMaxim 69:f915c4c59a69 376 // Sr AD,0 [A] SRP [A] E1 [A] Sr AD,1 [A] DD A\ P
IanBenzMaxim 69:f915c4c59a69 377 //
IanBenzMaxim 69:f915c4c59a69 378 // [] indicates from slave
IanBenzMaxim 69:f915c4c59a69 379 // DD data read
IanBenzMaxim 26:a361e3f42ba5 380
IanBenzMaxim 74:23be10c32fa3 381 OneWireMaster::CmdResult result;
IanBenzMaxim 74:23be10c32fa3 382 uint8_t buf;
IanBenzMaxim 74:23be10c32fa3 383
IanBenzMaxim 75:8b627804927c 384 result = configureLevel(afterLevel);
IanBenzMaxim 74:23be10c32fa3 385 if (result != OneWireMaster::Success)
IanBenzMaxim 74:23be10c32fa3 386 {
IanBenzMaxim 74:23be10c32fa3 387 return result;
IanBenzMaxim 74:23be10c32fa3 388 }
IanBenzMaxim 74:23be10c32fa3 389
IanBenzMaxim 75:8b627804927c 390 result = sendCommand(OwReadByteCmd);
IanBenzMaxim 69:f915c4c59a69 391
IanBenzMaxim 74:23be10c32fa3 392 if (result == OneWireMaster::Success)
IanBenzMaxim 74:23be10c32fa3 393 {
IanBenzMaxim 74:23be10c32fa3 394 result = pollBusy();
IanBenzMaxim 74:23be10c32fa3 395 }
IanBenzMaxim 69:f915c4c59a69 396
IanBenzMaxim 74:23be10c32fa3 397 if (result == OneWireMaster::Success)
IanBenzMaxim 74:23be10c32fa3 398 {
IanBenzMaxim 74:23be10c32fa3 399 result = readRegister(ReadDataReg, buf);
IanBenzMaxim 74:23be10c32fa3 400 }
IanBenzMaxim 74:23be10c32fa3 401
IanBenzMaxim 74:23be10c32fa3 402 if (result == OneWireMaster::Success)
IanBenzMaxim 74:23be10c32fa3 403 {
IanBenzMaxim 75:8b627804927c 404 recvByte = buf;
IanBenzMaxim 74:23be10c32fa3 405 }
IanBenzMaxim 74:23be10c32fa3 406
IanBenzMaxim 74:23be10c32fa3 407 return result;
j3 17:b646b1e3970b 408 }
j3 17:b646b1e3970b 409
IanBenzMaxim 75:8b627804927c 410 OneWireMaster::CmdResult DS248x::OWSetSpeed(OWSpeed newSpeed)
j3 1:91e52f8ab8bf 411 {
IanBenzMaxim 74:23be10c32fa3 412 // Requested speed is already set
IanBenzMaxim 75:8b627804927c 413 if (m_curConfig.get1WS() == (newSpeed == OverdriveSpeed))
IanBenzMaxim 74:23be10c32fa3 414 {
IanBenzMaxim 74:23be10c32fa3 415 return OneWireMaster::Success;
IanBenzMaxim 74:23be10c32fa3 416 }
j3 2:02d228c25fd4 417
IanBenzMaxim 74:23be10c32fa3 418 // set the speed
IanBenzMaxim 74:23be10c32fa3 419 Config newConfig = m_curConfig;
IanBenzMaxim 75:8b627804927c 420 newConfig.set1WS(newSpeed == OverdriveSpeed);
IanBenzMaxim 74:23be10c32fa3 421
IanBenzMaxim 74:23be10c32fa3 422 // write the new config
IanBenzMaxim 74:23be10c32fa3 423 return writeConfig(newConfig, true);
j3 1:91e52f8ab8bf 424 }
j3 1:91e52f8ab8bf 425
IanBenzMaxim 75:8b627804927c 426 OneWireMaster::CmdResult DS248x::OWSetLevel(OWLevel newLevel)
j3 1:91e52f8ab8bf 427 {
IanBenzMaxim 75:8b627804927c 428 if (newLevel == StrongLevel)
IanBenzMaxim 73:2cecc1372acc 429 {
IanBenzMaxim 69:f915c4c59a69 430 return OneWireMaster::OperationFailure;
IanBenzMaxim 74:23be10c32fa3 431 }
IanBenzMaxim 74:23be10c32fa3 432
IanBenzMaxim 75:8b627804927c 433 return configureLevel(newLevel);
IanBenzMaxim 21:00c94aeb533e 434 }
IanBenzMaxim 21:00c94aeb533e 435
IanBenzMaxim 73:2cecc1372acc 436 OneWireMaster::CmdResult DS248x::writeConfig(const Config & config, bool verify)
j3 6:1faafa0b3cd7 437 {
IanBenzMaxim 74:23be10c32fa3 438 uint8_t configBuf;
IanBenzMaxim 74:23be10c32fa3 439 OneWireMaster::CmdResult result;
IanBenzMaxim 74:23be10c32fa3 440
IanBenzMaxim 74:23be10c32fa3 441 configBuf = config.writeByte();
IanBenzMaxim 75:8b627804927c 442 result = sendCommand(WriteDeviceConfigCmd, configBuf);
IanBenzMaxim 74:23be10c32fa3 443 if (verify)
IanBenzMaxim 74:23be10c32fa3 444 {
IanBenzMaxim 74:23be10c32fa3 445 if (result == OneWireMaster::Success)
IanBenzMaxim 74:23be10c32fa3 446 {
IanBenzMaxim 74:23be10c32fa3 447 result = readRegister(ConfigReg, configBuf);
IanBenzMaxim 74:23be10c32fa3 448 }
IanBenzMaxim 74:23be10c32fa3 449 if (result == OneWireMaster::Success)
IanBenzMaxim 74:23be10c32fa3 450 {
IanBenzMaxim 74:23be10c32fa3 451 if (configBuf != config.readByte())
IanBenzMaxim 74:23be10c32fa3 452 {
IanBenzMaxim 74:23be10c32fa3 453 result = OneWireMaster::OperationFailure;
IanBenzMaxim 74:23be10c32fa3 454 }
IanBenzMaxim 74:23be10c32fa3 455 }
IanBenzMaxim 74:23be10c32fa3 456 }
IanBenzMaxim 74:23be10c32fa3 457
IanBenzMaxim 69:f915c4c59a69 458 if (result == OneWireMaster::Success)
IanBenzMaxim 69:f915c4c59a69 459 {
IanBenzMaxim 74:23be10c32fa3 460 m_curConfig = config;
IanBenzMaxim 69:f915c4c59a69 461 }
IanBenzMaxim 69:f915c4c59a69 462
IanBenzMaxim 74:23be10c32fa3 463 return result;
IanBenzMaxim 69:f915c4c59a69 464 }
IanBenzMaxim 69:f915c4c59a69 465
IanBenzMaxim 73:2cecc1372acc 466 OneWireMaster::CmdResult DS248x::readRegister(Register reg, uint8_t & buf, bool skipSetPointer) const
IanBenzMaxim 69:f915c4c59a69 467 {
IanBenzMaxim 69:f915c4c59a69 468 CmdResult result;
IanBenzMaxim 75:8b627804927c 469 result = sendCommand(SetReadPointerCmd, reg);
IanBenzMaxim 69:f915c4c59a69 470 if (result == Success)
IanBenzMaxim 69:f915c4c59a69 471 {
IanBenzMaxim 75:8b627804927c 472 if (m_p_i2c_bus->read(m_adrs, reinterpret_cast<char *>(&buf), 1) != I2C_READ_OK)
IanBenzMaxim 73:2cecc1372acc 473 {
IanBenzMaxim 69:f915c4c59a69 474 result = CommunicationReadError;
IanBenzMaxim 74:23be10c32fa3 475 }
IanBenzMaxim 69:f915c4c59a69 476 }
IanBenzMaxim 69:f915c4c59a69 477 return result;
IanBenzMaxim 69:f915c4c59a69 478 }
IanBenzMaxim 69:f915c4c59a69 479
IanBenzMaxim 73:2cecc1372acc 480 OneWireMaster::CmdResult DS248x::pollBusy(uint8_t * pStatus)
IanBenzMaxim 69:f915c4c59a69 481 {
IanBenzMaxim 74:23be10c32fa3 482 const unsigned int pollLimit = 200;
IanBenzMaxim 74:23be10c32fa3 483
IanBenzMaxim 74:23be10c32fa3 484 OneWireMaster::CmdResult result;
IanBenzMaxim 74:23be10c32fa3 485 uint8_t status;
IanBenzMaxim 74:23be10c32fa3 486 unsigned int pollCount = 0;
IanBenzMaxim 69:f915c4c59a69 487
IanBenzMaxim 74:23be10c32fa3 488 do
IanBenzMaxim 74:23be10c32fa3 489 {
IanBenzMaxim 74:23be10c32fa3 490 result = readRegister(StatusReg, status, true);
IanBenzMaxim 74:23be10c32fa3 491 if (result != OneWireMaster::Success)
IanBenzMaxim 74:23be10c32fa3 492 {
IanBenzMaxim 74:23be10c32fa3 493 return result;
IanBenzMaxim 74:23be10c32fa3 494 }
IanBenzMaxim 74:23be10c32fa3 495 if (pStatus != NULL)
IanBenzMaxim 74:23be10c32fa3 496 {
IanBenzMaxim 74:23be10c32fa3 497 *pStatus = status;
IanBenzMaxim 74:23be10c32fa3 498 }
IanBenzMaxim 74:23be10c32fa3 499 if (pollCount++ >= pollLimit)
IanBenzMaxim 74:23be10c32fa3 500 {
IanBenzMaxim 74:23be10c32fa3 501 return OneWireMaster::TimeoutError;
IanBenzMaxim 74:23be10c32fa3 502 }
IanBenzMaxim 74:23be10c32fa3 503 } while (status & STATUS_1WB);
IanBenzMaxim 69:f915c4c59a69 504
IanBenzMaxim 74:23be10c32fa3 505 return OneWireMaster::Success;
IanBenzMaxim 69:f915c4c59a69 506 }
IanBenzMaxim 69:f915c4c59a69 507
IanBenzMaxim 73:2cecc1372acc 508 OneWireMaster::CmdResult DS248x::configureLevel(OWLevel level)
IanBenzMaxim 69:f915c4c59a69 509 {
IanBenzMaxim 69:f915c4c59a69 510 OneWireMaster::CmdResult result;
IanBenzMaxim 75:8b627804927c 511 if (m_curConfig.getSPU() != (level == StrongLevel))
IanBenzMaxim 69:f915c4c59a69 512 {
IanBenzMaxim 69:f915c4c59a69 513 Config newConfig = m_curConfig;
IanBenzMaxim 75:8b627804927c 514 newConfig.setSPU(level == StrongLevel);
IanBenzMaxim 69:f915c4c59a69 515 result = writeConfig(newConfig, true);
IanBenzMaxim 69:f915c4c59a69 516 }
IanBenzMaxim 69:f915c4c59a69 517 else
IanBenzMaxim 69:f915c4c59a69 518 {
IanBenzMaxim 69:f915c4c59a69 519 result = OneWireMaster::Success;
IanBenzMaxim 69:f915c4c59a69 520 }
IanBenzMaxim 69:f915c4c59a69 521 return result;
IanBenzMaxim 69:f915c4c59a69 522 }
IanBenzMaxim 69:f915c4c59a69 523
IanBenzMaxim 75:8b627804927c 524 OneWireMaster::CmdResult DS248x::sendCommand(Command cmd) const
IanBenzMaxim 69:f915c4c59a69 525 {
IanBenzMaxim 69:f915c4c59a69 526 CmdResult result;
IanBenzMaxim 75:8b627804927c 527 if (m_p_i2c_bus->write(m_adrs, reinterpret_cast<const char *>(&cmd), 1) == I2C_WRITE_OK)
IanBenzMaxim 73:2cecc1372acc 528 {
IanBenzMaxim 69:f915c4c59a69 529 result = Success;
IanBenzMaxim 74:23be10c32fa3 530 }
IanBenzMaxim 69:f915c4c59a69 531 else
IanBenzMaxim 73:2cecc1372acc 532 {
IanBenzMaxim 69:f915c4c59a69 533 result = CommunicationWriteError;
IanBenzMaxim 74:23be10c32fa3 534 }
IanBenzMaxim 69:f915c4c59a69 535 return result;
IanBenzMaxim 69:f915c4c59a69 536 }
IanBenzMaxim 69:f915c4c59a69 537
IanBenzMaxim 75:8b627804927c 538 OneWireMaster::CmdResult DS248x::sendCommand(Command cmd, uint8_t param) const
IanBenzMaxim 69:f915c4c59a69 539 {
IanBenzMaxim 69:f915c4c59a69 540 CmdResult result;
IanBenzMaxim 69:f915c4c59a69 541 char buf[2] = { cmd, param };
IanBenzMaxim 75:8b627804927c 542 if (m_p_i2c_bus->write(m_adrs, buf, 2) == I2C_WRITE_OK)
IanBenzMaxim 73:2cecc1372acc 543 {
IanBenzMaxim 69:f915c4c59a69 544 result = Success;
IanBenzMaxim 74:23be10c32fa3 545 }
IanBenzMaxim 69:f915c4c59a69 546 else
IanBenzMaxim 73:2cecc1372acc 547 {
IanBenzMaxim 69:f915c4c59a69 548 result = CommunicationWriteError;
IanBenzMaxim 74:23be10c32fa3 549 }
IanBenzMaxim 69:f915c4c59a69 550 return result;
IanBenzMaxim 69:f915c4c59a69 551 }