Implementation of 1-Wire with added Alarm Search Functionality
Dependents: Max32630_One_Wire_Interface
OneWire_Masters/DS248x/ds248x.cpp@17:b646b1e3970b, 2016-03-18 (annotated)
- Committer:
- j3
- Date:
- Fri Mar 18 20:21:05 2016 +0000
- Revision:
- 17:b646b1e3970b
- Parent:
- 15:f6cb0d906fb6
- Child:
- 21:00c94aeb533e
Updated library with error codes on return statements
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 | |
j3 | 1:91e52f8ab8bf | 33 | |
j3 | 1:91e52f8ab8bf | 34 | #include "ds248x.h" |
j3 | 1:91e52f8ab8bf | 35 | |
j3 | 1:91e52f8ab8bf | 36 | |
j3 | 1:91e52f8ab8bf | 37 | //********************************************************************* |
j3 | 5:ce108eeb878d | 38 | Ds248x::Ds248x(I2C &i2c_bus, DS248X_I2C_ADRS adrs) |
j3 | 6:1faafa0b3cd7 | 39 | :_p_i2c_bus(&i2c_bus), _i2c_owner(false) |
j3 | 1:91e52f8ab8bf | 40 | { |
j3 | 6:1faafa0b3cd7 | 41 | set_i2c_adrs(adrs); |
j3 | 1:91e52f8ab8bf | 42 | } |
j3 | 1:91e52f8ab8bf | 43 | |
j3 | 1:91e52f8ab8bf | 44 | |
j3 | 1:91e52f8ab8bf | 45 | //********************************************************************* |
j3 | 5:ce108eeb878d | 46 | Ds248x::Ds248x(PinName sda, PinName scl, DS248X_I2C_ADRS adrs) |
j3 | 6:1faafa0b3cd7 | 47 | :_p_i2c_bus(new I2C(sda, scl)), _i2c_owner(true) |
j3 | 1:91e52f8ab8bf | 48 | { |
j3 | 6:1faafa0b3cd7 | 49 | set_i2c_adrs(adrs); |
j3 | 1:91e52f8ab8bf | 50 | } |
j3 | 1:91e52f8ab8bf | 51 | |
j3 | 1:91e52f8ab8bf | 52 | |
j3 | 1:91e52f8ab8bf | 53 | //********************************************************************* |
j3 | 1:91e52f8ab8bf | 54 | Ds248x::~Ds248x() |
j3 | 1:91e52f8ab8bf | 55 | { |
j3 | 5:ce108eeb878d | 56 | if(_i2c_owner) |
j3 | 1:91e52f8ab8bf | 57 | { |
j3 | 1:91e52f8ab8bf | 58 | delete _p_i2c_bus; |
j3 | 1:91e52f8ab8bf | 59 | } |
j3 | 1:91e52f8ab8bf | 60 | } |
j3 | 1:91e52f8ab8bf | 61 | |
j3 | 1:91e52f8ab8bf | 62 | |
j3 | 1:91e52f8ab8bf | 63 | //********************************************************************* |
j3 | 17:b646b1e3970b | 64 | OneWireInterface::CmdResult Ds248x::OWInitMaster(void) |
j3 | 14:7b2886a50321 | 65 | { |
j3 | 14:7b2886a50321 | 66 | return(detect()); |
j3 | 14:7b2886a50321 | 67 | } |
j3 | 14:7b2886a50321 | 68 | |
j3 | 14:7b2886a50321 | 69 | |
j3 | 14:7b2886a50321 | 70 | //********************************************************************* |
j3 | 17:b646b1e3970b | 71 | OneWireInterface::CmdResult Ds248x::detect(void) |
j3 | 2:02d228c25fd4 | 72 | { |
j3 | 17:b646b1e3970b | 73 | OneWireInterface::CmdResult result; |
j3 | 2:02d228c25fd4 | 74 | |
j3 | 2:02d228c25fd4 | 75 | // reset the ds2484 ON selected address |
j3 | 17:b646b1e3970b | 76 | result = reset(); |
j3 | 17:b646b1e3970b | 77 | if(result == OneWireInterface::Success) |
j3 | 2:02d228c25fd4 | 78 | { |
j3 | 2:02d228c25fd4 | 79 | // default configuration |
j3 | 17:b646b1e3970b | 80 | _c1WS = 0; |
j3 | 17:b646b1e3970b | 81 | _cSPU = 0; |
j3 | 17:b646b1e3970b | 82 | _cPDN = 0; |
j3 | 17:b646b1e3970b | 83 | _cAPU = 0; |
j3 | 2:02d228c25fd4 | 84 | |
j3 | 17:b646b1e3970b | 85 | result = write_config(_c1WS | _cSPU | _cPDN | _cAPU); |
j3 | 2:02d228c25fd4 | 86 | } |
j3 | 2:02d228c25fd4 | 87 | |
j3 | 17:b646b1e3970b | 88 | return result; |
j3 | 2:02d228c25fd4 | 89 | } |
j3 | 2:02d228c25fd4 | 90 | |
j3 | 2:02d228c25fd4 | 91 | |
j3 | 2:02d228c25fd4 | 92 | //********************************************************************* |
j3 | 17:b646b1e3970b | 93 | OneWireInterface::CmdResult Ds248x::reset(void) |
j3 | 1:91e52f8ab8bf | 94 | { |
j3 | 17:b646b1e3970b | 95 | OneWireInterface::CmdResult result; |
j3 | 17:b646b1e3970b | 96 | |
j3 | 2:02d228c25fd4 | 97 | char status; |
j3 | 2:02d228c25fd4 | 98 | char packet[] = {CMD_DRST}; |
j3 | 2:02d228c25fd4 | 99 | |
j3 | 2:02d228c25fd4 | 100 | // Device Reset |
j3 | 2:02d228c25fd4 | 101 | // S AD,0 [A] DRST [A] Sr AD,1 [A] [SS] A\ P |
j3 | 2:02d228c25fd4 | 102 | // [] indicates from slave |
j3 | 2:02d228c25fd4 | 103 | // SS status byte to read to verify state |
j3 | 2:02d228c25fd4 | 104 | |
j3 | 17:b646b1e3970b | 105 | if(_p_i2c_bus->write(_w_adrs, packet, 1) != I2C_WRITE_OK) |
j3 | 17:b646b1e3970b | 106 | { |
j3 | 17:b646b1e3970b | 107 | result = OneWireInterface::CommunicationWriteError; |
j3 | 17:b646b1e3970b | 108 | } |
j3 | 17:b646b1e3970b | 109 | else |
j3 | 17:b646b1e3970b | 110 | { |
j3 | 17:b646b1e3970b | 111 | if(_p_i2c_bus->read(_r_adrs, &status, 1) != I2C_READ_OK) |
j3 | 17:b646b1e3970b | 112 | { |
j3 | 17:b646b1e3970b | 113 | result = OneWireInterface::CommunicationReadError; |
j3 | 17:b646b1e3970b | 114 | } |
j3 | 17:b646b1e3970b | 115 | else |
j3 | 17:b646b1e3970b | 116 | { |
j3 | 17:b646b1e3970b | 117 | if((status & 0xF7) == 0x10) |
j3 | 17:b646b1e3970b | 118 | { |
j3 | 17:b646b1e3970b | 119 | result = OneWireInterface::Success; |
j3 | 17:b646b1e3970b | 120 | } |
j3 | 17:b646b1e3970b | 121 | else |
j3 | 17:b646b1e3970b | 122 | { |
j3 | 17:b646b1e3970b | 123 | result = OneWireInterface::OperationFailure; |
j3 | 17:b646b1e3970b | 124 | } |
j3 | 17:b646b1e3970b | 125 | } |
j3 | 17:b646b1e3970b | 126 | } |
j3 | 2:02d228c25fd4 | 127 | |
j3 | 17:b646b1e3970b | 128 | return result; |
j3 | 2:02d228c25fd4 | 129 | } |
j3 | 2:02d228c25fd4 | 130 | |
j3 | 2:02d228c25fd4 | 131 | |
j3 | 2:02d228c25fd4 | 132 | //********************************************************************* |
j3 | 17:b646b1e3970b | 133 | OneWireInterface::CmdResult Ds248x::write_config(uint8_t config) |
j3 | 2:02d228c25fd4 | 134 | { |
j3 | 17:b646b1e3970b | 135 | OneWireInterface::CmdResult result; |
j3 | 17:b646b1e3970b | 136 | |
j3 | 2:02d228c25fd4 | 137 | char read_config; |
j3 | 2:02d228c25fd4 | 138 | char packet [] = {CMD_WCFG, (config | (~config << 4))}; |
j3 | 2:02d228c25fd4 | 139 | |
j3 | 17:b646b1e3970b | 140 | if(_p_i2c_bus->write(_w_adrs, packet, 2) != I2C_WRITE_OK) |
j3 | 2:02d228c25fd4 | 141 | { |
j3 | 17:b646b1e3970b | 142 | result = OneWireInterface::CommunicationWriteError; |
j3 | 2:02d228c25fd4 | 143 | } |
j3 | 2:02d228c25fd4 | 144 | else |
j3 | 2:02d228c25fd4 | 145 | { |
j3 | 17:b646b1e3970b | 146 | if(_p_i2c_bus->read(_r_adrs, &read_config, 1) != I2C_READ_OK) |
j3 | 17:b646b1e3970b | 147 | { |
j3 | 17:b646b1e3970b | 148 | result = OneWireInterface::CommunicationReadError; |
j3 | 17:b646b1e3970b | 149 | } |
j3 | 17:b646b1e3970b | 150 | else |
j3 | 17:b646b1e3970b | 151 | { |
j3 | 17:b646b1e3970b | 152 | // check for failure due to incorrect read back |
j3 | 17:b646b1e3970b | 153 | if (config != read_config) |
j3 | 17:b646b1e3970b | 154 | { |
j3 | 17:b646b1e3970b | 155 | reset(); |
j3 | 17:b646b1e3970b | 156 | result = OneWireInterface::OperationFailure; |
j3 | 17:b646b1e3970b | 157 | } |
j3 | 17:b646b1e3970b | 158 | else |
j3 | 17:b646b1e3970b | 159 | { |
j3 | 17:b646b1e3970b | 160 | result = OneWireInterface::Success; |
j3 | 17:b646b1e3970b | 161 | } |
j3 | 17:b646b1e3970b | 162 | } |
j3 | 2:02d228c25fd4 | 163 | } |
j3 | 2:02d228c25fd4 | 164 | |
j3 | 17:b646b1e3970b | 165 | return result; |
j3 | 1:91e52f8ab8bf | 166 | } |
j3 | 1:91e52f8ab8bf | 167 | |
j3 | 1:91e52f8ab8bf | 168 | |
j3 | 1:91e52f8ab8bf | 169 | //********************************************************************* |
j3 | 17:b646b1e3970b | 170 | OneWireInterface::CmdResult Ds248x::channel_select(uint8_t channel) |
j3 | 1:91e52f8ab8bf | 171 | { |
j3 | 17:b646b1e3970b | 172 | OneWireInterface::CmdResult result; |
j3 | 2:02d228c25fd4 | 173 | |
j3 | 2:02d228c25fd4 | 174 | char ch, ch_read, check; |
j3 | 2:02d228c25fd4 | 175 | char packet [2]; |
j3 | 2:02d228c25fd4 | 176 | |
j3 | 2:02d228c25fd4 | 177 | packet[0] = CMD_CHSL; |
j3 | 2:02d228c25fd4 | 178 | |
j3 | 2:02d228c25fd4 | 179 | // Channel Select (Case A) |
j3 | 2:02d228c25fd4 | 180 | // S AD,0 [A] CHSL [A] CC [A] Sr AD,1 [A] [RR] A\ P |
j3 | 2:02d228c25fd4 | 181 | // [] indicates from slave |
j3 | 2:02d228c25fd4 | 182 | // CC channel value |
j3 | 2:02d228c25fd4 | 183 | // RR channel read back |
j3 | 2:02d228c25fd4 | 184 | |
j3 | 2:02d228c25fd4 | 185 | switch (channel) |
j3 | 2:02d228c25fd4 | 186 | { |
j3 | 2:02d228c25fd4 | 187 | default: case 0: ch = 0xF0; ch_read = 0xB8; break; |
j3 | 2:02d228c25fd4 | 188 | case 1: ch = 0xE1; ch_read = 0xB1; break; |
j3 | 2:02d228c25fd4 | 189 | case 2: ch = 0xD2; ch_read = 0xAA; break; |
j3 | 2:02d228c25fd4 | 190 | case 3: ch = 0xC3; ch_read = 0xA3; break; |
j3 | 2:02d228c25fd4 | 191 | case 4: ch = 0xB4; ch_read = 0x9C; break; |
j3 | 2:02d228c25fd4 | 192 | case 5: ch = 0xA5; ch_read = 0x95; break; |
j3 | 2:02d228c25fd4 | 193 | case 6: ch = 0x96; ch_read = 0x8E; break; |
j3 | 2:02d228c25fd4 | 194 | case 7: ch = 0x87; ch_read = 0x87; break; |
j3 | 2:02d228c25fd4 | 195 | }; |
j3 | 2:02d228c25fd4 | 196 | |
j3 | 2:02d228c25fd4 | 197 | packet[1] = ch; |
j3 | 2:02d228c25fd4 | 198 | |
j3 | 17:b646b1e3970b | 199 | if(_p_i2c_bus->write(_w_adrs, packet, 2) != I2C_WRITE_OK) |
j3 | 17:b646b1e3970b | 200 | { |
j3 | 17:b646b1e3970b | 201 | result = OneWireInterface::CommunicationWriteError; |
j3 | 17:b646b1e3970b | 202 | } |
j3 | 17:b646b1e3970b | 203 | else |
j3 | 17:b646b1e3970b | 204 | { |
j3 | 17:b646b1e3970b | 205 | if(_p_i2c_bus->read(_r_adrs, &check, 1) != I2C_READ_OK) |
j3 | 17:b646b1e3970b | 206 | { |
j3 | 17:b646b1e3970b | 207 | result = OneWireInterface::CommunicationReadError; |
j3 | 17:b646b1e3970b | 208 | } |
j3 | 17:b646b1e3970b | 209 | else |
j3 | 17:b646b1e3970b | 210 | { |
j3 | 17:b646b1e3970b | 211 | // check for failure due to incorrect read back of channel |
j3 | 17:b646b1e3970b | 212 | if (check == ch_read) |
j3 | 17:b646b1e3970b | 213 | { |
j3 | 17:b646b1e3970b | 214 | result = OneWireInterface::Success; |
j3 | 17:b646b1e3970b | 215 | } |
j3 | 17:b646b1e3970b | 216 | else |
j3 | 17:b646b1e3970b | 217 | { |
j3 | 17:b646b1e3970b | 218 | result = OneWireInterface::OperationFailure; |
j3 | 17:b646b1e3970b | 219 | } |
j3 | 17:b646b1e3970b | 220 | } |
j3 | 17:b646b1e3970b | 221 | } |
j3 | 2:02d228c25fd4 | 222 | |
j3 | 17:b646b1e3970b | 223 | return result; |
j3 | 2:02d228c25fd4 | 224 | } |
j3 | 2:02d228c25fd4 | 225 | |
j3 | 2:02d228c25fd4 | 226 | |
j3 | 2:02d228c25fd4 | 227 | //********************************************************************* |
j3 | 17:b646b1e3970b | 228 | OneWireInterface::CmdResult Ds248x::adjust_timing(uint8_t param, uint8_t val) |
j3 | 2:02d228c25fd4 | 229 | { |
j3 | 17:b646b1e3970b | 230 | OneWireInterface::CmdResult result; |
j3 | 17:b646b1e3970b | 231 | |
j3 | 2:02d228c25fd4 | 232 | char read_port_config; |
j3 | 2:02d228c25fd4 | 233 | char control_byte; |
j3 | 2:02d228c25fd4 | 234 | |
j3 | 2:02d228c25fd4 | 235 | control_byte = (((param & 0x0F) << 4) | (val & 0x0F)); |
j3 | 2:02d228c25fd4 | 236 | |
j3 | 2:02d228c25fd4 | 237 | char packet [] = {CMD_A1WP, control_byte}; |
j3 | 2:02d228c25fd4 | 238 | |
j3 | 17:b646b1e3970b | 239 | if(_p_i2c_bus->write(_w_adrs, packet, 2) != I2C_WRITE_OK) |
j3 | 17:b646b1e3970b | 240 | { |
j3 | 17:b646b1e3970b | 241 | result = OneWireInterface::CommunicationWriteError; |
j3 | 17:b646b1e3970b | 242 | } |
j3 | 17:b646b1e3970b | 243 | else |
j3 | 2:02d228c25fd4 | 244 | { |
j3 | 17:b646b1e3970b | 245 | if(_p_i2c_bus->read(_r_adrs, &read_port_config, 1) != I2C_READ_OK) |
j3 | 17:b646b1e3970b | 246 | { |
j3 | 17:b646b1e3970b | 247 | result = OneWireInterface::CommunicationReadError; |
j3 | 17:b646b1e3970b | 248 | } |
j3 | 17:b646b1e3970b | 249 | else |
j3 | 17:b646b1e3970b | 250 | { |
j3 | 17:b646b1e3970b | 251 | // check for failure due to incorrect read back |
j3 | 17:b646b1e3970b | 252 | if ((control_byte & 0x0F) != read_port_config) |
j3 | 17:b646b1e3970b | 253 | { |
j3 | 17:b646b1e3970b | 254 | result = OneWireInterface::OperationFailure; |
j3 | 17:b646b1e3970b | 255 | reset(); |
j3 | 17:b646b1e3970b | 256 | } |
j3 | 17:b646b1e3970b | 257 | else |
j3 | 17:b646b1e3970b | 258 | { |
j3 | 17:b646b1e3970b | 259 | result = OneWireInterface::Success; |
j3 | 17:b646b1e3970b | 260 | } |
j3 | 17:b646b1e3970b | 261 | } |
j3 | 2:02d228c25fd4 | 262 | } |
j3 | 17:b646b1e3970b | 263 | |
j3 | 17:b646b1e3970b | 264 | return result; |
j3 | 1:91e52f8ab8bf | 265 | } |
j3 | 1:91e52f8ab8bf | 266 | |
j3 | 1:91e52f8ab8bf | 267 | |
j3 | 1:91e52f8ab8bf | 268 | //********************************************************************* |
j3 | 17:b646b1e3970b | 269 | OneWireInterface::CmdResult Ds248x::search_triplet(uint8_t search_direction, uint8_t & status) |
j3 | 1:91e52f8ab8bf | 270 | { |
j3 | 17:b646b1e3970b | 271 | OneWireInterface::CmdResult result; |
j3 | 17:b646b1e3970b | 272 | |
j3 | 2:02d228c25fd4 | 273 | uint8_t poll_count = 0; |
j3 | 2:02d228c25fd4 | 274 | char packet [] = {CMD_1WT, search_direction ? 0x80 : 0x00}; |
j3 | 17:b646b1e3970b | 275 | char read_data; |
j3 | 2:02d228c25fd4 | 276 | |
j3 | 2:02d228c25fd4 | 277 | // 1-Wire Triplet (Case B) |
j3 | 2:02d228c25fd4 | 278 | // S AD,0 [A] 1WT [A] SS [A] Sr AD,1 [A] [Status] A [Status] A\ P |
j3 | 2:02d228c25fd4 | 279 | // \--------/ |
j3 | 2:02d228c25fd4 | 280 | // Repeat until 1WB bit has changed to 0 |
j3 | 2:02d228c25fd4 | 281 | // [] indicates from slave |
j3 | 2:02d228c25fd4 | 282 | // SS indicates byte containing search direction bit value in msbit |
j3 | 2:02d228c25fd4 | 283 | |
j3 | 17:b646b1e3970b | 284 | if(_p_i2c_bus->write(_w_adrs, packet, 2) != I2C_WRITE_OK) |
j3 | 2:02d228c25fd4 | 285 | { |
j3 | 17:b646b1e3970b | 286 | result = OneWireInterface::CommunicationWriteError; |
j3 | 2:02d228c25fd4 | 287 | } |
j3 | 2:02d228c25fd4 | 288 | else |
j3 | 2:02d228c25fd4 | 289 | { |
j3 | 17:b646b1e3970b | 290 | // loop checking 1WB bit for completion of 1-Wire operation |
j3 | 17:b646b1e3970b | 291 | // abort if poll limit reached |
j3 | 17:b646b1e3970b | 292 | |
j3 | 17:b646b1e3970b | 293 | //dummy write for loop |
j3 | 17:b646b1e3970b | 294 | result = OneWireInterface::Success; //so far |
j3 | 17:b646b1e3970b | 295 | do |
j3 | 17:b646b1e3970b | 296 | { |
j3 | 17:b646b1e3970b | 297 | if(_p_i2c_bus->read(_r_adrs, &read_data, 1) != I2C_READ_OK) |
j3 | 17:b646b1e3970b | 298 | { |
j3 | 17:b646b1e3970b | 299 | result = OneWireInterface::CommunicationReadError; |
j3 | 17:b646b1e3970b | 300 | } |
j3 | 17:b646b1e3970b | 301 | } |
j3 | 17:b646b1e3970b | 302 | while ((read_data & STATUS_1WB) && (poll_count++ < POLL_LIMIT) && (result != OneWireInterface::CommunicationReadError)); |
j3 | 17:b646b1e3970b | 303 | |
j3 | 17:b646b1e3970b | 304 | if((result == OneWireInterface::CommunicationReadError) || (poll_count >= POLL_LIMIT)) |
j3 | 17:b646b1e3970b | 305 | { |
j3 | 17:b646b1e3970b | 306 | // check for failure due to poll limit reached |
j3 | 17:b646b1e3970b | 307 | if(poll_count >= POLL_LIMIT) |
j3 | 17:b646b1e3970b | 308 | { |
j3 | 17:b646b1e3970b | 309 | // handle error |
j3 | 17:b646b1e3970b | 310 | // ... |
j3 | 17:b646b1e3970b | 311 | reset(); |
j3 | 17:b646b1e3970b | 312 | result = OneWireInterface::TimeoutError; |
j3 | 17:b646b1e3970b | 313 | } |
j3 | 17:b646b1e3970b | 314 | } |
j3 | 17:b646b1e3970b | 315 | else |
j3 | 17:b646b1e3970b | 316 | { |
j3 | 17:b646b1e3970b | 317 | status = read_data; |
j3 | 17:b646b1e3970b | 318 | result = OneWireInterface::Success; |
j3 | 17:b646b1e3970b | 319 | } |
j3 | 2:02d228c25fd4 | 320 | } |
j3 | 17:b646b1e3970b | 321 | |
j3 | 17:b646b1e3970b | 322 | return result; |
j3 | 1:91e52f8ab8bf | 323 | } |
j3 | 1:91e52f8ab8bf | 324 | |
j3 | 1:91e52f8ab8bf | 325 | |
j3 | 1:91e52f8ab8bf | 326 | //********************************************************************* |
j3 | 17:b646b1e3970b | 327 | OneWireInterface::CmdResult Ds248x::OWReset(void) |
j3 | 2:02d228c25fd4 | 328 | { |
j3 | 17:b646b1e3970b | 329 | OneWireInterface::CmdResult result; |
j3 | 2:02d228c25fd4 | 330 | |
j3 | 2:02d228c25fd4 | 331 | uint8_t poll_count = 0; |
j3 | 2:02d228c25fd4 | 332 | char status; |
j3 | 2:02d228c25fd4 | 333 | char packet [] = {CMD_1WRS}; |
j3 | 1:91e52f8ab8bf | 334 | |
j3 | 2:02d228c25fd4 | 335 | // 1-Wire reset (Case B) |
j3 | 2:02d228c25fd4 | 336 | // S AD,0 [A] 1WRS [A] Sr AD,1 [A] [Status] A [Status] A\ P |
j3 | 2:02d228c25fd4 | 337 | // \--------/ |
j3 | 2:02d228c25fd4 | 338 | // Repeat until 1WB bit has changed to 0 |
j3 | 2:02d228c25fd4 | 339 | // [] indicates from slave |
j3 | 2:02d228c25fd4 | 340 | |
j3 | 17:b646b1e3970b | 341 | if(_p_i2c_bus->write(_w_adrs, packet, 1) != I2C_WRITE_OK) |
j3 | 2:02d228c25fd4 | 342 | { |
j3 | 17:b646b1e3970b | 343 | result = OneWireInterface::CommunicationWriteError; |
j3 | 2:02d228c25fd4 | 344 | } |
j3 | 2:02d228c25fd4 | 345 | else |
j3 | 2:02d228c25fd4 | 346 | { |
j3 | 17:b646b1e3970b | 347 | // loop checking 1WB bit for completion of 1-Wire operation |
j3 | 17:b646b1e3970b | 348 | // abort if poll limit reached |
j3 | 17:b646b1e3970b | 349 | //dummy write for loop |
j3 | 17:b646b1e3970b | 350 | result = OneWireInterface::Success; //so far |
j3 | 17:b646b1e3970b | 351 | do |
j3 | 2:02d228c25fd4 | 352 | { |
j3 | 17:b646b1e3970b | 353 | if(_p_i2c_bus->read(_r_adrs, &status, 1) != I2C_READ_OK) |
j3 | 17:b646b1e3970b | 354 | { |
j3 | 17:b646b1e3970b | 355 | result = OneWireInterface::CommunicationReadError; |
j3 | 17:b646b1e3970b | 356 | } |
j3 | 17:b646b1e3970b | 357 | } |
j3 | 17:b646b1e3970b | 358 | while ((status & STATUS_1WB) && (poll_count++ < POLL_LIMIT) && (result != OneWireInterface::CommunicationReadError)); |
j3 | 17:b646b1e3970b | 359 | |
j3 | 17:b646b1e3970b | 360 | if((result == OneWireInterface::CommunicationReadError) || (poll_count >= POLL_LIMIT)) |
j3 | 17:b646b1e3970b | 361 | { |
j3 | 17:b646b1e3970b | 362 | // check for failure due to poll limit reached |
j3 | 17:b646b1e3970b | 363 | if(poll_count >= POLL_LIMIT) |
j3 | 17:b646b1e3970b | 364 | { |
j3 | 17:b646b1e3970b | 365 | // handle error |
j3 | 17:b646b1e3970b | 366 | // ... |
j3 | 17:b646b1e3970b | 367 | reset(); |
j3 | 17:b646b1e3970b | 368 | result = OneWireInterface::TimeoutError; |
j3 | 17:b646b1e3970b | 369 | } |
j3 | 2:02d228c25fd4 | 370 | } |
j3 | 2:02d228c25fd4 | 371 | else |
j3 | 2:02d228c25fd4 | 372 | { |
j3 | 17:b646b1e3970b | 373 | // check for short condition |
j3 | 17:b646b1e3970b | 374 | if (status & STATUS_SD) |
j3 | 17:b646b1e3970b | 375 | { |
j3 | 17:b646b1e3970b | 376 | _short_detected = true; |
j3 | 17:b646b1e3970b | 377 | } |
j3 | 17:b646b1e3970b | 378 | else |
j3 | 17:b646b1e3970b | 379 | { |
j3 | 17:b646b1e3970b | 380 | _short_detected = false; |
j3 | 17:b646b1e3970b | 381 | } |
j3 | 17:b646b1e3970b | 382 | |
j3 | 17:b646b1e3970b | 383 | // check for presence detect |
j3 | 17:b646b1e3970b | 384 | if (status & STATUS_PPD) |
j3 | 17:b646b1e3970b | 385 | { |
j3 | 17:b646b1e3970b | 386 | result = OneWireInterface::Success; |
j3 | 17:b646b1e3970b | 387 | } |
j3 | 17:b646b1e3970b | 388 | else |
j3 | 17:b646b1e3970b | 389 | { |
j3 | 17:b646b1e3970b | 390 | result = OneWireInterface::OperationFailure; |
j3 | 17:b646b1e3970b | 391 | } |
j3 | 2:02d228c25fd4 | 392 | } |
j3 | 2:02d228c25fd4 | 393 | } |
j3 | 17:b646b1e3970b | 394 | |
j3 | 17:b646b1e3970b | 395 | return result; |
j3 | 1:91e52f8ab8bf | 396 | } |
j3 | 1:91e52f8ab8bf | 397 | |
j3 | 1:91e52f8ab8bf | 398 | |
j3 | 1:91e52f8ab8bf | 399 | //********************************************************************* |
j3 | 17:b646b1e3970b | 400 | OneWireInterface::CmdResult Ds248x::OWTouchBit(uint8_t & sendrecvbit) |
j3 | 1:91e52f8ab8bf | 401 | { |
j3 | 17:b646b1e3970b | 402 | OneWireInterface::CmdResult result; |
j3 | 17:b646b1e3970b | 403 | |
j3 | 2:02d228c25fd4 | 404 | uint8_t poll_count = 0; |
j3 | 2:02d228c25fd4 | 405 | char status; |
j3 | 17:b646b1e3970b | 406 | char packet[] = {CMD_1WSB, sendrecvbit ? 0x80 : 0x00}; |
j3 | 2:02d228c25fd4 | 407 | |
j3 | 2:02d228c25fd4 | 408 | // 1-Wire bit (Case B) |
j3 | 2:02d228c25fd4 | 409 | // S AD,0 [A] 1WSB [A] BB [A] Sr AD,1 [A] [Status] A [Status] A\ P |
j3 | 2:02d228c25fd4 | 410 | // \--------/ |
j3 | 2:02d228c25fd4 | 411 | // Repeat until 1WB bit has changed to 0 |
j3 | 2:02d228c25fd4 | 412 | // [] indicates from slave |
j3 | 2:02d228c25fd4 | 413 | // BB indicates byte containing bit value in msbit |
j3 | 2:02d228c25fd4 | 414 | |
j3 | 17:b646b1e3970b | 415 | if(_p_i2c_bus->write(_w_adrs, packet, 2) != I2C_WRITE_OK) |
j3 | 2:02d228c25fd4 | 416 | { |
j3 | 17:b646b1e3970b | 417 | result = OneWireInterface::CommunicationWriteError; |
j3 | 2:02d228c25fd4 | 418 | } |
j3 | 2:02d228c25fd4 | 419 | else |
j3 | 2:02d228c25fd4 | 420 | { |
j3 | 17:b646b1e3970b | 421 | // loop checking 1WB bit for completion of 1-Wire operation |
j3 | 17:b646b1e3970b | 422 | // abort if poll limit reached |
j3 | 17:b646b1e3970b | 423 | //dummy write for loop |
j3 | 17:b646b1e3970b | 424 | result = OneWireInterface::Success; //so far |
j3 | 17:b646b1e3970b | 425 | do |
j3 | 2:02d228c25fd4 | 426 | { |
j3 | 17:b646b1e3970b | 427 | if(_p_i2c_bus->read(_r_adrs, &status, 1) != I2C_READ_OK) |
j3 | 17:b646b1e3970b | 428 | { |
j3 | 17:b646b1e3970b | 429 | result = OneWireInterface::CommunicationReadError; |
j3 | 17:b646b1e3970b | 430 | } |
j3 | 17:b646b1e3970b | 431 | } |
j3 | 17:b646b1e3970b | 432 | while ((status & STATUS_1WB) && (poll_count++ < POLL_LIMIT) && (result != OneWireInterface::CommunicationReadError)); |
j3 | 17:b646b1e3970b | 433 | |
j3 | 17:b646b1e3970b | 434 | if((result == OneWireInterface::CommunicationReadError) || (poll_count >= POLL_LIMIT)) |
j3 | 17:b646b1e3970b | 435 | { |
j3 | 17:b646b1e3970b | 436 | // check for failure due to poll limit reached |
j3 | 17:b646b1e3970b | 437 | if (poll_count >= POLL_LIMIT) |
j3 | 17:b646b1e3970b | 438 | { |
j3 | 17:b646b1e3970b | 439 | // handle error |
j3 | 17:b646b1e3970b | 440 | // ... |
j3 | 17:b646b1e3970b | 441 | reset(); |
j3 | 17:b646b1e3970b | 442 | result = OneWireInterface::TimeoutError; |
j3 | 17:b646b1e3970b | 443 | } |
j3 | 2:02d228c25fd4 | 444 | } |
j3 | 2:02d228c25fd4 | 445 | else |
j3 | 2:02d228c25fd4 | 446 | { |
j3 | 17:b646b1e3970b | 447 | // return bit state through out param |
j3 | 17:b646b1e3970b | 448 | if (status & STATUS_SBR) |
j3 | 17:b646b1e3970b | 449 | { |
j3 | 17:b646b1e3970b | 450 | sendrecvbit = 1; |
j3 | 17:b646b1e3970b | 451 | |
j3 | 17:b646b1e3970b | 452 | } |
j3 | 17:b646b1e3970b | 453 | else |
j3 | 17:b646b1e3970b | 454 | { |
j3 | 17:b646b1e3970b | 455 | sendrecvbit = 0; |
j3 | 17:b646b1e3970b | 456 | } |
j3 | 17:b646b1e3970b | 457 | result = OneWireInterface::Success; |
j3 | 2:02d228c25fd4 | 458 | } |
j3 | 2:02d228c25fd4 | 459 | } |
j3 | 17:b646b1e3970b | 460 | |
j3 | 17:b646b1e3970b | 461 | return result; |
j3 | 1:91e52f8ab8bf | 462 | } |
j3 | 1:91e52f8ab8bf | 463 | |
j3 | 1:91e52f8ab8bf | 464 | |
j3 | 1:91e52f8ab8bf | 465 | //********************************************************************* |
j3 | 17:b646b1e3970b | 466 | OneWireInterface::CmdResult Ds248x::OWWriteByte(uint8_t sendbyte) |
j3 | 1:91e52f8ab8bf | 467 | { |
j3 | 17:b646b1e3970b | 468 | OneWireInterface::CmdResult result; |
j3 | 1:91e52f8ab8bf | 469 | |
j3 | 2:02d228c25fd4 | 470 | uint8_t poll_count = 0; |
j3 | 2:02d228c25fd4 | 471 | char status; |
j3 | 2:02d228c25fd4 | 472 | char packet [] = {CMD_1WWB, sendbyte}; |
j3 | 2:02d228c25fd4 | 473 | |
j3 | 2:02d228c25fd4 | 474 | // 1-Wire Write Byte (Case B) |
j3 | 2:02d228c25fd4 | 475 | // S AD,0 [A] 1WWB [A] DD [A] Sr AD,1 [A] [Status] A [Status] A\ P |
j3 | 2:02d228c25fd4 | 476 | // \--------/ |
j3 | 2:02d228c25fd4 | 477 | // Repeat until 1WB bit has changed to 0 |
j3 | 2:02d228c25fd4 | 478 | // [] indicates from slave |
j3 | 2:02d228c25fd4 | 479 | // DD data to write |
j3 | 2:02d228c25fd4 | 480 | |
j3 | 17:b646b1e3970b | 481 | if(_p_i2c_bus->write(_w_adrs, packet, 2) != I2C_WRITE_OK) |
j3 | 2:02d228c25fd4 | 482 | { |
j3 | 17:b646b1e3970b | 483 | result = OneWireInterface::CommunicationWriteError; |
j3 | 2:02d228c25fd4 | 484 | } |
j3 | 2:02d228c25fd4 | 485 | else |
j3 | 2:02d228c25fd4 | 486 | { |
j3 | 17:b646b1e3970b | 487 | // loop checking 1WB bit for completion of 1-Wire operation |
j3 | 17:b646b1e3970b | 488 | // abort if poll limit reached |
j3 | 17:b646b1e3970b | 489 | //dummy write for loop |
j3 | 17:b646b1e3970b | 490 | result = OneWireInterface::Success; //so far |
j3 | 17:b646b1e3970b | 491 | do |
j3 | 17:b646b1e3970b | 492 | { |
j3 | 17:b646b1e3970b | 493 | if(_p_i2c_bus->read(_r_adrs, &status, 1) != I2C_READ_OK) |
j3 | 17:b646b1e3970b | 494 | { |
j3 | 17:b646b1e3970b | 495 | result = OneWireInterface::CommunicationReadError; |
j3 | 17:b646b1e3970b | 496 | } |
j3 | 17:b646b1e3970b | 497 | } |
j3 | 17:b646b1e3970b | 498 | while ((status & STATUS_1WB) && (poll_count++ < POLL_LIMIT) && (result != OneWireInterface::CommunicationReadError)); |
j3 | 17:b646b1e3970b | 499 | |
j3 | 17:b646b1e3970b | 500 | if((result == OneWireInterface::CommunicationReadError) || (poll_count >= POLL_LIMIT)) |
j3 | 17:b646b1e3970b | 501 | { |
j3 | 17:b646b1e3970b | 502 | // check for failure due to poll limit reached |
j3 | 17:b646b1e3970b | 503 | if (poll_count >= POLL_LIMIT) |
j3 | 17:b646b1e3970b | 504 | { |
j3 | 17:b646b1e3970b | 505 | // handle error |
j3 | 17:b646b1e3970b | 506 | // ... |
j3 | 17:b646b1e3970b | 507 | reset(); |
j3 | 17:b646b1e3970b | 508 | result = OneWireInterface::TimeoutError; |
j3 | 17:b646b1e3970b | 509 | } |
j3 | 17:b646b1e3970b | 510 | } |
j3 | 17:b646b1e3970b | 511 | else |
j3 | 17:b646b1e3970b | 512 | { |
j3 | 17:b646b1e3970b | 513 | result = OneWireInterface::Success; |
j3 | 17:b646b1e3970b | 514 | } |
j3 | 2:02d228c25fd4 | 515 | } |
j3 | 2:02d228c25fd4 | 516 | |
j3 | 17:b646b1e3970b | 517 | return result; |
j3 | 1:91e52f8ab8bf | 518 | } |
j3 | 1:91e52f8ab8bf | 519 | |
j3 | 1:91e52f8ab8bf | 520 | |
j3 | 1:91e52f8ab8bf | 521 | //********************************************************************* |
j3 | 17:b646b1e3970b | 522 | OneWireInterface::CmdResult Ds248x::OWReadByte(uint8_t & recvbyte) |
j3 | 1:91e52f8ab8bf | 523 | { |
j3 | 17:b646b1e3970b | 524 | OneWireInterface::CmdResult result; |
j3 | 2:02d228c25fd4 | 525 | |
j3 | 2:02d228c25fd4 | 526 | uint8_t poll_count = 0; |
j3 | 2:02d228c25fd4 | 527 | char data, status; |
j3 | 2:02d228c25fd4 | 528 | char packet[2] = {CMD_1WRB, 0}; |
j3 | 2:02d228c25fd4 | 529 | |
j3 | 2:02d228c25fd4 | 530 | // 1-Wire Read Bytes (Case C) |
j3 | 2:02d228c25fd4 | 531 | // S AD,0 [A] 1WRB [A] Sr AD,1 [A] [Status] A [Status] A\ |
j3 | 2:02d228c25fd4 | 532 | // \--------/ |
j3 | 2:02d228c25fd4 | 533 | // Repeat until 1WB bit has changed to 0 |
j3 | 2:02d228c25fd4 | 534 | // Sr AD,0 [A] SRP [A] E1 [A] Sr AD,1 [A] DD A\ P |
j3 | 2:02d228c25fd4 | 535 | // |
j3 | 2:02d228c25fd4 | 536 | // [] indicates from slave |
j3 | 2:02d228c25fd4 | 537 | // DD data read |
j3 | 2:02d228c25fd4 | 538 | |
j3 | 17:b646b1e3970b | 539 | if(_p_i2c_bus->write(_w_adrs, packet, 1) != I2C_WRITE_OK) |
j3 | 2:02d228c25fd4 | 540 | { |
j3 | 17:b646b1e3970b | 541 | result = OneWireInterface::CommunicationWriteError; |
j3 | 2:02d228c25fd4 | 542 | } |
j3 | 2:02d228c25fd4 | 543 | else |
j3 | 2:02d228c25fd4 | 544 | { |
j3 | 17:b646b1e3970b | 545 | // loop checking 1WB bit for completion of 1-Wire operation |
j3 | 17:b646b1e3970b | 546 | // abort if poll limit reached |
j3 | 17:b646b1e3970b | 547 | //dummy write for loop |
j3 | 17:b646b1e3970b | 548 | result = OneWireInterface::Success; //so far |
j3 | 17:b646b1e3970b | 549 | do |
j3 | 17:b646b1e3970b | 550 | { |
j3 | 17:b646b1e3970b | 551 | if(_p_i2c_bus->read(_r_adrs, &status, 1) != I2C_READ_OK) |
j3 | 17:b646b1e3970b | 552 | { |
j3 | 17:b646b1e3970b | 553 | result = OneWireInterface::CommunicationReadError; |
j3 | 17:b646b1e3970b | 554 | } |
j3 | 17:b646b1e3970b | 555 | } |
j3 | 17:b646b1e3970b | 556 | while ((status & STATUS_1WB) && (poll_count++ < POLL_LIMIT) && (result != OneWireInterface::CommunicationReadError)); |
j3 | 17:b646b1e3970b | 557 | |
j3 | 17:b646b1e3970b | 558 | if((result == OneWireInterface::CommunicationReadError) || (poll_count >= POLL_LIMIT)) |
j3 | 17:b646b1e3970b | 559 | { |
j3 | 17:b646b1e3970b | 560 | // check for failure due to poll limit reached |
j3 | 17:b646b1e3970b | 561 | if (poll_count >= POLL_LIMIT) |
j3 | 17:b646b1e3970b | 562 | { |
j3 | 17:b646b1e3970b | 563 | // handle error |
j3 | 17:b646b1e3970b | 564 | // ... |
j3 | 17:b646b1e3970b | 565 | reset(); |
j3 | 17:b646b1e3970b | 566 | result = OneWireInterface::TimeoutError; |
j3 | 17:b646b1e3970b | 567 | } |
j3 | 17:b646b1e3970b | 568 | } |
j3 | 17:b646b1e3970b | 569 | else |
j3 | 17:b646b1e3970b | 570 | { |
j3 | 17:b646b1e3970b | 571 | packet[0] = CMD_SRP; |
j3 | 17:b646b1e3970b | 572 | packet[1] = 0xE1; |
j3 | 17:b646b1e3970b | 573 | |
j3 | 17:b646b1e3970b | 574 | if(_p_i2c_bus->write(_w_adrs, packet, 2) != I2C_WRITE_OK) |
j3 | 17:b646b1e3970b | 575 | { |
j3 | 17:b646b1e3970b | 576 | result = OneWireInterface::CommunicationWriteError; |
j3 | 17:b646b1e3970b | 577 | } |
j3 | 17:b646b1e3970b | 578 | else |
j3 | 17:b646b1e3970b | 579 | { |
j3 | 17:b646b1e3970b | 580 | if(_p_i2c_bus->read(_r_adrs, &data, 1) != I2C_READ_OK) |
j3 | 17:b646b1e3970b | 581 | { |
j3 | 17:b646b1e3970b | 582 | result = OneWireInterface::CommunicationReadError; |
j3 | 17:b646b1e3970b | 583 | } |
j3 | 17:b646b1e3970b | 584 | else |
j3 | 17:b646b1e3970b | 585 | { |
j3 | 17:b646b1e3970b | 586 | recvbyte = data; |
j3 | 17:b646b1e3970b | 587 | result = OneWireInterface::Success; |
j3 | 17:b646b1e3970b | 588 | } |
j3 | 17:b646b1e3970b | 589 | } |
j3 | 17:b646b1e3970b | 590 | } |
j3 | 2:02d228c25fd4 | 591 | } |
j3 | 2:02d228c25fd4 | 592 | |
j3 | 17:b646b1e3970b | 593 | return result; |
j3 | 17:b646b1e3970b | 594 | } |
j3 | 17:b646b1e3970b | 595 | |
j3 | 17:b646b1e3970b | 596 | |
j3 | 17:b646b1e3970b | 597 | //********************************************************************* |
j3 | 17:b646b1e3970b | 598 | OneWireInterface::CmdResult Ds248x::OWWriteBlock(const uint8_t *tran_buf, uint8_t tran_len) |
j3 | 17:b646b1e3970b | 599 | { |
j3 | 17:b646b1e3970b | 600 | OneWireInterface::CmdResult result; |
j3 | 17:b646b1e3970b | 601 | |
j3 | 17:b646b1e3970b | 602 | for(uint8_t idx = 0; idx < tran_len; idx++) |
j3 | 17:b646b1e3970b | 603 | { |
j3 | 17:b646b1e3970b | 604 | result = OWWriteByte(tran_buf[idx]); |
j3 | 17:b646b1e3970b | 605 | if(result != OneWireInterface::Success) |
j3 | 17:b646b1e3970b | 606 | { |
j3 | 17:b646b1e3970b | 607 | break; |
j3 | 17:b646b1e3970b | 608 | } |
j3 | 17:b646b1e3970b | 609 | } |
j3 | 17:b646b1e3970b | 610 | |
j3 | 17:b646b1e3970b | 611 | return result; |
j3 | 17:b646b1e3970b | 612 | } |
j3 | 17:b646b1e3970b | 613 | |
j3 | 17:b646b1e3970b | 614 | |
j3 | 17:b646b1e3970b | 615 | //********************************************************************* |
j3 | 17:b646b1e3970b | 616 | OneWireInterface::CmdResult Ds248x::OWReadBlock(uint8_t *rx_buf, uint8_t rx_len) |
j3 | 17:b646b1e3970b | 617 | { |
j3 | 17:b646b1e3970b | 618 | OneWireInterface::CmdResult result; |
j3 | 17:b646b1e3970b | 619 | |
j3 | 17:b646b1e3970b | 620 | for(uint8_t idx = 0; idx < rx_len; idx++) |
j3 | 17:b646b1e3970b | 621 | { |
j3 | 17:b646b1e3970b | 622 | //OwReadByte() uses pass by reference |
j3 | 17:b646b1e3970b | 623 | result = OWReadByte(rx_buf[idx]); |
j3 | 17:b646b1e3970b | 624 | if(result != OneWireInterface::Success) |
j3 | 17:b646b1e3970b | 625 | { |
j3 | 17:b646b1e3970b | 626 | break; |
j3 | 17:b646b1e3970b | 627 | } |
j3 | 17:b646b1e3970b | 628 | } |
j3 | 17:b646b1e3970b | 629 | |
j3 | 17:b646b1e3970b | 630 | return result; |
j3 | 1:91e52f8ab8bf | 631 | } |
j3 | 1:91e52f8ab8bf | 632 | |
j3 | 1:91e52f8ab8bf | 633 | |
j3 | 1:91e52f8ab8bf | 634 | //********************************************************************* |
j3 | 17:b646b1e3970b | 635 | OneWireInterface::CmdResult Ds248x::OWSearch(RomId & romId) |
j3 | 1:91e52f8ab8bf | 636 | { |
j3 | 17:b646b1e3970b | 637 | int id_bit_number; |
j3 | 17:b646b1e3970b | 638 | int last_zero, rom_byte_number; |
j3 | 17:b646b1e3970b | 639 | int id_bit, cmp_id_bit; |
j3 | 17:b646b1e3970b | 640 | unsigned char rom_byte_mask, status; |
j3 | 17:b646b1e3970b | 641 | bool search_result; |
j3 | 17:b646b1e3970b | 642 | unsigned char crc8 = 0; |
j3 | 17:b646b1e3970b | 643 | SEARCH_DIRECTION search_direction; |
j3 | 17:b646b1e3970b | 644 | |
j3 | 17:b646b1e3970b | 645 | // initialize for search |
j3 | 17:b646b1e3970b | 646 | id_bit_number = 1; |
j3 | 17:b646b1e3970b | 647 | last_zero = 0; |
j3 | 17:b646b1e3970b | 648 | rom_byte_number = 0; |
j3 | 17:b646b1e3970b | 649 | rom_byte_mask = 1; |
j3 | 17:b646b1e3970b | 650 | search_result = false; |
j3 | 2:02d228c25fd4 | 651 | |
j3 | 17:b646b1e3970b | 652 | // if the last call was not the last one |
j3 | 17:b646b1e3970b | 653 | if (!_last_device_flag) |
j3 | 17:b646b1e3970b | 654 | { |
j3 | 17:b646b1e3970b | 655 | // 1-Wire reset |
j3 | 17:b646b1e3970b | 656 | OneWireInterface::CmdResult result = OWReset(); |
j3 | 17:b646b1e3970b | 657 | if (result != OneWireInterface::Success) |
j3 | 17:b646b1e3970b | 658 | { |
j3 | 17:b646b1e3970b | 659 | // reset the search |
j3 | 17:b646b1e3970b | 660 | _last_discrepancy = 0; |
j3 | 17:b646b1e3970b | 661 | _last_device_flag = false; |
j3 | 17:b646b1e3970b | 662 | _last_family_discrepancy = 0; |
j3 | 17:b646b1e3970b | 663 | return result; |
j3 | 17:b646b1e3970b | 664 | } |
j3 | 17:b646b1e3970b | 665 | |
j3 | 17:b646b1e3970b | 666 | // issue the search command |
j3 | 17:b646b1e3970b | 667 | OWWriteByte(0xF0); |
j3 | 2:02d228c25fd4 | 668 | |
j3 | 17:b646b1e3970b | 669 | // loop to do the search |
j3 | 17:b646b1e3970b | 670 | do |
j3 | 17:b646b1e3970b | 671 | { |
j3 | 17:b646b1e3970b | 672 | // if this discrepancy if before the Last Discrepancy |
j3 | 17:b646b1e3970b | 673 | // on a previous next then pick the same as last time |
j3 | 17:b646b1e3970b | 674 | if (id_bit_number < _last_discrepancy) |
j3 | 17:b646b1e3970b | 675 | { |
j3 | 17:b646b1e3970b | 676 | if ((romId[rom_byte_number] & rom_byte_mask) > 0) |
j3 | 17:b646b1e3970b | 677 | search_direction = DIRECTION_WRITE_ONE; |
j3 | 17:b646b1e3970b | 678 | else |
j3 | 17:b646b1e3970b | 679 | search_direction = DIRECTION_WRITE_ZERO; |
j3 | 17:b646b1e3970b | 680 | } |
j3 | 17:b646b1e3970b | 681 | else |
j3 | 17:b646b1e3970b | 682 | { |
j3 | 17:b646b1e3970b | 683 | // if equal to last pick 1, if not then pick 0 |
j3 | 17:b646b1e3970b | 684 | if (id_bit_number == _last_discrepancy) |
j3 | 17:b646b1e3970b | 685 | search_direction = DIRECTION_WRITE_ONE; |
j3 | 17:b646b1e3970b | 686 | else |
j3 | 17:b646b1e3970b | 687 | search_direction = DIRECTION_WRITE_ZERO; |
j3 | 17:b646b1e3970b | 688 | } |
j3 | 2:02d228c25fd4 | 689 | |
j3 | 17:b646b1e3970b | 690 | // Peform a triple operation on the DS2465 which will perform 2 read bits and 1 write bit |
j3 | 17:b646b1e3970b | 691 | search_triplet(search_direction, status); |
j3 | 17:b646b1e3970b | 692 | |
j3 | 17:b646b1e3970b | 693 | // check bit results in status byte |
j3 | 17:b646b1e3970b | 694 | id_bit = ((status & STATUS_SBR) == STATUS_SBR); |
j3 | 17:b646b1e3970b | 695 | cmp_id_bit = ((status & STATUS_TSB) == STATUS_TSB); |
j3 | 17:b646b1e3970b | 696 | search_direction = ((status & STATUS_DIR) == STATUS_DIR) ? DIRECTION_WRITE_ONE : DIRECTION_WRITE_ZERO; |
j3 | 17:b646b1e3970b | 697 | |
j3 | 17:b646b1e3970b | 698 | // check for no devices on 1-wire |
j3 | 17:b646b1e3970b | 699 | if ((id_bit) && (cmp_id_bit)) |
j3 | 17:b646b1e3970b | 700 | break; |
j3 | 17:b646b1e3970b | 701 | else |
j3 | 17:b646b1e3970b | 702 | { |
j3 | 17:b646b1e3970b | 703 | if ((!id_bit) && (!cmp_id_bit) && (search_direction == DIRECTION_WRITE_ZERO)) |
j3 | 2:02d228c25fd4 | 704 | { |
j3 | 17:b646b1e3970b | 705 | last_zero = id_bit_number; |
j3 | 17:b646b1e3970b | 706 | |
j3 | 17:b646b1e3970b | 707 | // check for Last discrepancy in family |
j3 | 17:b646b1e3970b | 708 | if (last_zero < 9) |
j3 | 17:b646b1e3970b | 709 | _last_family_discrepancy = last_zero; |
j3 | 2:02d228c25fd4 | 710 | } |
j3 | 2:02d228c25fd4 | 711 | |
j3 | 17:b646b1e3970b | 712 | // set or clear the bit in the ROM byte rom_byte_number |
j3 | 17:b646b1e3970b | 713 | // with mask rom_byte_mask |
j3 | 17:b646b1e3970b | 714 | if (search_direction == DIRECTION_WRITE_ONE) |
j3 | 17:b646b1e3970b | 715 | romId[rom_byte_number] |= rom_byte_mask; |
j3 | 17:b646b1e3970b | 716 | else |
j3 | 17:b646b1e3970b | 717 | romId[rom_byte_number] &= (unsigned char)~rom_byte_mask; |
j3 | 2:02d228c25fd4 | 718 | |
j3 | 17:b646b1e3970b | 719 | // increment the byte counter id_bit_number |
j3 | 17:b646b1e3970b | 720 | // and shift the mask rom_byte_mask |
j3 | 17:b646b1e3970b | 721 | id_bit_number++; |
j3 | 17:b646b1e3970b | 722 | rom_byte_mask <<= 1; |
j3 | 2:02d228c25fd4 | 723 | |
j3 | 17:b646b1e3970b | 724 | // if the mask is 0 then go to new SerialNum byte rom_byte_number and reset mask |
j3 | 17:b646b1e3970b | 725 | if (rom_byte_mask == 0) |
j3 | 17:b646b1e3970b | 726 | { |
j3 | 17:b646b1e3970b | 727 | crc8 = romId.calculateCRC8(crc8, romId[rom_byte_number]); // accumulate the CRC |
j3 | 17:b646b1e3970b | 728 | rom_byte_number++; |
j3 | 17:b646b1e3970b | 729 | rom_byte_mask = 1; |
j3 | 17:b646b1e3970b | 730 | } |
j3 | 17:b646b1e3970b | 731 | } |
j3 | 17:b646b1e3970b | 732 | } |
j3 | 17:b646b1e3970b | 733 | while(rom_byte_number < RomId::byteLen); // loop until through all ROM bytes 0-7 |
j3 | 2:02d228c25fd4 | 734 | |
j3 | 17:b646b1e3970b | 735 | // if the search was successful then |
j3 | 17:b646b1e3970b | 736 | if (!((id_bit_number <= (RomId::byteLen * 8)) || (crc8 != 0))) |
j3 | 17:b646b1e3970b | 737 | { |
j3 | 17:b646b1e3970b | 738 | // search successful so set m_last_discrepancy,m_last_device_flag,search_result |
j3 | 17:b646b1e3970b | 739 | _last_discrepancy = last_zero; |
j3 | 2:02d228c25fd4 | 740 | |
j3 | 17:b646b1e3970b | 741 | // check for last device |
j3 | 17:b646b1e3970b | 742 | if (_last_discrepancy == 0) |
j3 | 17:b646b1e3970b | 743 | _last_device_flag = true; |
j3 | 2:02d228c25fd4 | 744 | |
j3 | 17:b646b1e3970b | 745 | search_result = true; |
j3 | 17:b646b1e3970b | 746 | } |
j3 | 17:b646b1e3970b | 747 | } |
j3 | 2:02d228c25fd4 | 748 | |
j3 | 17:b646b1e3970b | 749 | // if no device found then reset counters so next 'search' will be like a first |
j3 | 17:b646b1e3970b | 750 | if (!search_result || (romId.familyCode() == 0)) |
j3 | 17:b646b1e3970b | 751 | { |
j3 | 17:b646b1e3970b | 752 | _last_discrepancy = 0; |
j3 | 17:b646b1e3970b | 753 | _last_device_flag = false; |
j3 | 17:b646b1e3970b | 754 | _last_family_discrepancy = 0; |
j3 | 17:b646b1e3970b | 755 | search_result = false; |
j3 | 17:b646b1e3970b | 756 | } |
j3 | 2:02d228c25fd4 | 757 | |
j3 | 17:b646b1e3970b | 758 | return search_result ? OneWireInterface::Success : OneWireInterface::OperationFailure; |
j3 | 1:91e52f8ab8bf | 759 | } |
j3 | 1:91e52f8ab8bf | 760 | |
j3 | 1:91e52f8ab8bf | 761 | |
j3 | 1:91e52f8ab8bf | 762 | //********************************************************************* |
j3 | 17:b646b1e3970b | 763 | OneWireInterface::CmdResult Ds248x::OWSpeed(OW_SPEED new_speed) |
j3 | 1:91e52f8ab8bf | 764 | { |
j3 | 2:02d228c25fd4 | 765 | // set the speed |
j3 | 5:ce108eeb878d | 766 | if (new_speed == SPEED_OVERDRIVE) |
j3 | 2:02d228c25fd4 | 767 | { |
j3 | 2:02d228c25fd4 | 768 | _c1WS = CONFIG_1WS; |
j3 | 2:02d228c25fd4 | 769 | } |
j3 | 2:02d228c25fd4 | 770 | else |
j3 | 2:02d228c25fd4 | 771 | { |
j3 | 17:b646b1e3970b | 772 | _c1WS = 0; |
j3 | 2:02d228c25fd4 | 773 | } |
j3 | 2:02d228c25fd4 | 774 | |
j3 | 17:b646b1e3970b | 775 | // write the new config, and return result of op |
j3 | 17:b646b1e3970b | 776 | return write_config(_c1WS | _cSPU | _cPDN | _cAPU); |
j3 | 1:91e52f8ab8bf | 777 | } |
j3 | 1:91e52f8ab8bf | 778 | |
j3 | 1:91e52f8ab8bf | 779 | |
j3 | 1:91e52f8ab8bf | 780 | //********************************************************************* |
j3 | 17:b646b1e3970b | 781 | OneWireInterface::CmdResult Ds248x::OWLevel(OW_LEVEL new_level) |
j3 | 1:91e52f8ab8bf | 782 | { |
j3 | 17:b646b1e3970b | 783 | OneWireInterface::CmdResult result; |
j3 | 2:02d228c25fd4 | 784 | |
j3 | 2:02d228c25fd4 | 785 | // function only will turn back to non-strong pull-up |
j3 | 5:ce108eeb878d | 786 | if (new_level != LEVEL_NORMAL) |
j3 | 2:02d228c25fd4 | 787 | { |
j3 | 17:b646b1e3970b | 788 | result = OneWireInterface::OperationFailure; |
j3 | 2:02d228c25fd4 | 789 | } |
j3 | 2:02d228c25fd4 | 790 | else |
j3 | 2:02d228c25fd4 | 791 | { |
j3 | 2:02d228c25fd4 | 792 | // clear the strong pull-up bit in the global config state |
j3 | 17:b646b1e3970b | 793 | _cSPU = 0; |
j3 | 17:b646b1e3970b | 794 | |
j3 | 17:b646b1e3970b | 795 | result = write_config(_c1WS | _cSPU | _cPDN | _cAPU); |
j3 | 2:02d228c25fd4 | 796 | } |
j3 | 2:02d228c25fd4 | 797 | |
j3 | 17:b646b1e3970b | 798 | return result; |
j3 | 1:91e52f8ab8bf | 799 | } |
j3 | 1:91e52f8ab8bf | 800 | |
j3 | 1:91e52f8ab8bf | 801 | |
j3 | 1:91e52f8ab8bf | 802 | //********************************************************************* |
j3 | 17:b646b1e3970b | 803 | OneWireInterface::CmdResult Ds248x::OWWriteBytePower(uint8_t sendbyte) |
j3 | 1:91e52f8ab8bf | 804 | { |
j3 | 17:b646b1e3970b | 805 | OneWireInterface::CmdResult result; |
j3 | 2:02d228c25fd4 | 806 | |
j3 | 2:02d228c25fd4 | 807 | // set strong pull-up enable |
j3 | 2:02d228c25fd4 | 808 | _cSPU = CONFIG_SPU; |
j3 | 2:02d228c25fd4 | 809 | |
j3 | 2:02d228c25fd4 | 810 | // write the new config |
j3 | 17:b646b1e3970b | 811 | result = write_config(_c1WS | _cSPU | _cPDN | _cAPU); |
j3 | 17:b646b1e3970b | 812 | if (result == OneWireInterface::Success) |
j3 | 2:02d228c25fd4 | 813 | { |
j3 | 2:02d228c25fd4 | 814 | // perform write byte |
j3 | 17:b646b1e3970b | 815 | result = OWWriteByte(sendbyte); |
j3 | 2:02d228c25fd4 | 816 | } |
j3 | 2:02d228c25fd4 | 817 | |
j3 | 17:b646b1e3970b | 818 | return result; |
j3 | 1:91e52f8ab8bf | 819 | } |
j3 | 1:91e52f8ab8bf | 820 | |
j3 | 1:91e52f8ab8bf | 821 | |
j3 | 1:91e52f8ab8bf | 822 | //********************************************************************* |
j3 | 17:b646b1e3970b | 823 | OneWireInterface::CmdResult Ds248x::OWReadBitPower(uint8_t applyPowerResponse) |
j3 | 1:91e52f8ab8bf | 824 | { |
j3 | 17:b646b1e3970b | 825 | OneWireInterface::CmdResult result; |
j3 | 2:02d228c25fd4 | 826 | uint8_t rdbit; |
j3 | 2:02d228c25fd4 | 827 | |
j3 | 2:02d228c25fd4 | 828 | // set strong pull-up enable |
j3 | 2:02d228c25fd4 | 829 | _cSPU = CONFIG_SPU; |
j3 | 2:02d228c25fd4 | 830 | |
j3 | 2:02d228c25fd4 | 831 | // write the new config |
j3 | 17:b646b1e3970b | 832 | result = write_config(_c1WS | _cSPU | _cPDN | _cAPU); |
j3 | 17:b646b1e3970b | 833 | if (result == OneWireInterface::Success) |
j3 | 2:02d228c25fd4 | 834 | { |
j3 | 2:02d228c25fd4 | 835 | // perform read bit |
j3 | 17:b646b1e3970b | 836 | result = OWReadBit(rdbit); |
j3 | 17:b646b1e3970b | 837 | if(result == OneWireInterface::Success) |
j3 | 2:02d228c25fd4 | 838 | { |
j3 | 17:b646b1e3970b | 839 | // check if response was correct, if not then turn off strong pull-up |
j3 | 17:b646b1e3970b | 840 | if (rdbit != applyPowerResponse) |
j3 | 17:b646b1e3970b | 841 | { |
j3 | 17:b646b1e3970b | 842 | OWLevel(LEVEL_NORMAL); |
j3 | 17:b646b1e3970b | 843 | result = OneWireInterface::OperationFailure; |
j3 | 17:b646b1e3970b | 844 | } |
j3 | 2:02d228c25fd4 | 845 | } |
j3 | 2:02d228c25fd4 | 846 | } |
j3 | 2:02d228c25fd4 | 847 | |
j3 | 17:b646b1e3970b | 848 | return result; |
j3 | 1:91e52f8ab8bf | 849 | } |
j3 | 1:91e52f8ab8bf | 850 | |
j3 | 1:91e52f8ab8bf | 851 | |
j3 | 1:91e52f8ab8bf | 852 | //********************************************************************* |
j3 | 6:1faafa0b3cd7 | 853 | void Ds248x::set_i2c_adrs(DS248X_I2C_ADRS adrs) |
j3 | 6:1faafa0b3cd7 | 854 | { |
j3 | 6:1faafa0b3cd7 | 855 | _w_adrs = (adrs << 1); |
j3 | 6:1faafa0b3cd7 | 856 | _r_adrs = (_w_adrs | 1); |
j3 | 6:1faafa0b3cd7 | 857 | } |