Implementation of 1-Wire with added Alarm Search Functionality
Dependents: Max32630_One_Wire_Interface
OneWire_Masters/DS248x/ds248x.cpp@32:bce180b544ed, 2016-03-30 (annotated)
- Committer:
- IanBenzMaxim
- Date:
- Wed Mar 30 16:50:29 2016 -0500
- Revision:
- 32:bce180b544ed
- Parent:
- 27:d5aaefa252f1
- Child:
- 69:f915c4c59a69
1. Move the implementation of OWSearch() into OneWireMaster since it is a fairly complex algorithm that shouldn?t be implemented over and over. It will also match all other ROM function that are implemented there.
2. Create a new member function, OWTriplet(), in OneWireMaster to handle the virtual section of OWSearch(). Create a default implementation of OWTriplet() that uses OWReadByte() and OWWriteByte(). Masters only need to implement this function if they have a search accelerator of some sort.
3. Create type SearchState that will encapsulate all persistent data used by the search ROM functions. This will also make it easy to not have the search state part of the permanent OneWireMaster class data.
4. Rename OWSpeed() to OWSetSpeed() and OWLevel() to OWSetLevel() for naming consistency.
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" |
IanBenzMaxim | 27:d5aaefa252f1 | 35 | #include "RomId.hpp" |
j3 | 1:91e52f8ab8bf | 36 | |
j3 | 1:91e52f8ab8bf | 37 | |
j3 | 1:91e52f8ab8bf | 38 | //********************************************************************* |
j3 | 5:ce108eeb878d | 39 | Ds248x::Ds248x(I2C &i2c_bus, DS248X_I2C_ADRS adrs) |
j3 | 6:1faafa0b3cd7 | 40 | :_p_i2c_bus(&i2c_bus), _i2c_owner(false) |
j3 | 1:91e52f8ab8bf | 41 | { |
j3 | 6:1faafa0b3cd7 | 42 | set_i2c_adrs(adrs); |
j3 | 1:91e52f8ab8bf | 43 | } |
j3 | 1:91e52f8ab8bf | 44 | |
j3 | 1:91e52f8ab8bf | 45 | |
j3 | 1:91e52f8ab8bf | 46 | //********************************************************************* |
j3 | 5:ce108eeb878d | 47 | Ds248x::Ds248x(PinName sda, PinName scl, DS248X_I2C_ADRS adrs) |
j3 | 6:1faafa0b3cd7 | 48 | :_p_i2c_bus(new I2C(sda, scl)), _i2c_owner(true) |
j3 | 1:91e52f8ab8bf | 49 | { |
j3 | 6:1faafa0b3cd7 | 50 | set_i2c_adrs(adrs); |
j3 | 1:91e52f8ab8bf | 51 | } |
j3 | 1:91e52f8ab8bf | 52 | |
j3 | 1:91e52f8ab8bf | 53 | |
j3 | 1:91e52f8ab8bf | 54 | //********************************************************************* |
j3 | 1:91e52f8ab8bf | 55 | Ds248x::~Ds248x() |
j3 | 1:91e52f8ab8bf | 56 | { |
j3 | 5:ce108eeb878d | 57 | if(_i2c_owner) |
j3 | 1:91e52f8ab8bf | 58 | { |
j3 | 1:91e52f8ab8bf | 59 | delete _p_i2c_bus; |
j3 | 1:91e52f8ab8bf | 60 | } |
j3 | 1:91e52f8ab8bf | 61 | } |
j3 | 1:91e52f8ab8bf | 62 | |
j3 | 1:91e52f8ab8bf | 63 | |
j3 | 1:91e52f8ab8bf | 64 | //********************************************************************* |
j3 | 23:e8e403d61359 | 65 | OneWireMaster::CmdResult Ds248x::OWInitMaster(void) |
j3 | 14:7b2886a50321 | 66 | { |
j3 | 14:7b2886a50321 | 67 | return(detect()); |
j3 | 14:7b2886a50321 | 68 | } |
j3 | 14:7b2886a50321 | 69 | |
j3 | 14:7b2886a50321 | 70 | |
j3 | 14:7b2886a50321 | 71 | //********************************************************************* |
j3 | 23:e8e403d61359 | 72 | OneWireMaster::CmdResult Ds248x::detect(void) |
j3 | 2:02d228c25fd4 | 73 | { |
j3 | 23:e8e403d61359 | 74 | OneWireMaster::CmdResult result; |
j3 | 2:02d228c25fd4 | 75 | |
j3 | 2:02d228c25fd4 | 76 | // reset the ds2484 ON selected address |
j3 | 17:b646b1e3970b | 77 | result = reset(); |
j3 | 23:e8e403d61359 | 78 | if(result == OneWireMaster::Success) |
j3 | 2:02d228c25fd4 | 79 | { |
j3 | 2:02d228c25fd4 | 80 | // default configuration |
j3 | 17:b646b1e3970b | 81 | _c1WS = 0; |
j3 | 17:b646b1e3970b | 82 | _cSPU = 0; |
j3 | 17:b646b1e3970b | 83 | _cPDN = 0; |
j3 | 17:b646b1e3970b | 84 | _cAPU = 0; |
j3 | 2:02d228c25fd4 | 85 | |
j3 | 17:b646b1e3970b | 86 | result = write_config(_c1WS | _cSPU | _cPDN | _cAPU); |
j3 | 2:02d228c25fd4 | 87 | } |
j3 | 2:02d228c25fd4 | 88 | |
j3 | 17:b646b1e3970b | 89 | return result; |
j3 | 2:02d228c25fd4 | 90 | } |
j3 | 2:02d228c25fd4 | 91 | |
j3 | 2:02d228c25fd4 | 92 | |
j3 | 2:02d228c25fd4 | 93 | //********************************************************************* |
j3 | 23:e8e403d61359 | 94 | OneWireMaster::CmdResult Ds248x::reset(void) |
j3 | 1:91e52f8ab8bf | 95 | { |
j3 | 23:e8e403d61359 | 96 | OneWireMaster::CmdResult result; |
j3 | 17:b646b1e3970b | 97 | |
j3 | 2:02d228c25fd4 | 98 | char status; |
j3 | 2:02d228c25fd4 | 99 | char packet[] = {CMD_DRST}; |
j3 | 2:02d228c25fd4 | 100 | |
j3 | 2:02d228c25fd4 | 101 | // Device Reset |
j3 | 2:02d228c25fd4 | 102 | // S AD,0 [A] DRST [A] Sr AD,1 [A] [SS] A\ P |
j3 | 2:02d228c25fd4 | 103 | // [] indicates from slave |
j3 | 2:02d228c25fd4 | 104 | // SS status byte to read to verify state |
j3 | 2:02d228c25fd4 | 105 | |
j3 | 17:b646b1e3970b | 106 | if(_p_i2c_bus->write(_w_adrs, packet, 1) != I2C_WRITE_OK) |
j3 | 17:b646b1e3970b | 107 | { |
j3 | 23:e8e403d61359 | 108 | result = OneWireMaster::CommunicationWriteError; |
j3 | 17:b646b1e3970b | 109 | } |
j3 | 17:b646b1e3970b | 110 | else |
j3 | 17:b646b1e3970b | 111 | { |
j3 | 17:b646b1e3970b | 112 | if(_p_i2c_bus->read(_r_adrs, &status, 1) != I2C_READ_OK) |
j3 | 17:b646b1e3970b | 113 | { |
j3 | 23:e8e403d61359 | 114 | result = OneWireMaster::CommunicationReadError; |
j3 | 17:b646b1e3970b | 115 | } |
j3 | 17:b646b1e3970b | 116 | else |
j3 | 17:b646b1e3970b | 117 | { |
j3 | 17:b646b1e3970b | 118 | if((status & 0xF7) == 0x10) |
j3 | 17:b646b1e3970b | 119 | { |
j3 | 23:e8e403d61359 | 120 | result = OneWireMaster::Success; |
j3 | 17:b646b1e3970b | 121 | } |
j3 | 17:b646b1e3970b | 122 | else |
j3 | 17:b646b1e3970b | 123 | { |
j3 | 23:e8e403d61359 | 124 | result = OneWireMaster::OperationFailure; |
j3 | 17:b646b1e3970b | 125 | } |
j3 | 17:b646b1e3970b | 126 | } |
j3 | 17:b646b1e3970b | 127 | } |
j3 | 2:02d228c25fd4 | 128 | |
j3 | 17:b646b1e3970b | 129 | return result; |
j3 | 2:02d228c25fd4 | 130 | } |
j3 | 2:02d228c25fd4 | 131 | |
j3 | 2:02d228c25fd4 | 132 | |
j3 | 2:02d228c25fd4 | 133 | //********************************************************************* |
j3 | 23:e8e403d61359 | 134 | OneWireMaster::CmdResult Ds248x::write_config(uint8_t config) |
j3 | 2:02d228c25fd4 | 135 | { |
j3 | 23:e8e403d61359 | 136 | OneWireMaster::CmdResult result; |
j3 | 17:b646b1e3970b | 137 | |
j3 | 2:02d228c25fd4 | 138 | char read_config; |
j3 | 2:02d228c25fd4 | 139 | char packet [] = {CMD_WCFG, (config | (~config << 4))}; |
j3 | 2:02d228c25fd4 | 140 | |
j3 | 17:b646b1e3970b | 141 | if(_p_i2c_bus->write(_w_adrs, packet, 2) != I2C_WRITE_OK) |
j3 | 2:02d228c25fd4 | 142 | { |
j3 | 23:e8e403d61359 | 143 | result = OneWireMaster::CommunicationWriteError; |
j3 | 2:02d228c25fd4 | 144 | } |
j3 | 2:02d228c25fd4 | 145 | else |
j3 | 2:02d228c25fd4 | 146 | { |
j3 | 17:b646b1e3970b | 147 | if(_p_i2c_bus->read(_r_adrs, &read_config, 1) != I2C_READ_OK) |
j3 | 17:b646b1e3970b | 148 | { |
j3 | 23:e8e403d61359 | 149 | result = OneWireMaster::CommunicationReadError; |
j3 | 17:b646b1e3970b | 150 | } |
j3 | 17:b646b1e3970b | 151 | else |
j3 | 17:b646b1e3970b | 152 | { |
j3 | 17:b646b1e3970b | 153 | // check for failure due to incorrect read back |
j3 | 17:b646b1e3970b | 154 | if (config != read_config) |
j3 | 17:b646b1e3970b | 155 | { |
j3 | 17:b646b1e3970b | 156 | reset(); |
j3 | 23:e8e403d61359 | 157 | result = OneWireMaster::OperationFailure; |
j3 | 17:b646b1e3970b | 158 | } |
j3 | 17:b646b1e3970b | 159 | else |
j3 | 17:b646b1e3970b | 160 | { |
j3 | 23:e8e403d61359 | 161 | result = OneWireMaster::Success; |
j3 | 17:b646b1e3970b | 162 | } |
j3 | 17:b646b1e3970b | 163 | } |
j3 | 2:02d228c25fd4 | 164 | } |
j3 | 2:02d228c25fd4 | 165 | |
j3 | 17:b646b1e3970b | 166 | return result; |
j3 | 1:91e52f8ab8bf | 167 | } |
j3 | 1:91e52f8ab8bf | 168 | |
j3 | 1:91e52f8ab8bf | 169 | |
j3 | 1:91e52f8ab8bf | 170 | //********************************************************************* |
j3 | 23:e8e403d61359 | 171 | OneWireMaster::CmdResult Ds248x::channel_select(uint8_t channel) |
j3 | 1:91e52f8ab8bf | 172 | { |
j3 | 23:e8e403d61359 | 173 | OneWireMaster::CmdResult result; |
j3 | 2:02d228c25fd4 | 174 | |
j3 | 2:02d228c25fd4 | 175 | char ch, ch_read, check; |
j3 | 2:02d228c25fd4 | 176 | char packet [2]; |
j3 | 2:02d228c25fd4 | 177 | |
j3 | 2:02d228c25fd4 | 178 | packet[0] = CMD_CHSL; |
j3 | 2:02d228c25fd4 | 179 | |
j3 | 2:02d228c25fd4 | 180 | // Channel Select (Case A) |
j3 | 2:02d228c25fd4 | 181 | // S AD,0 [A] CHSL [A] CC [A] Sr AD,1 [A] [RR] A\ P |
j3 | 2:02d228c25fd4 | 182 | // [] indicates from slave |
j3 | 2:02d228c25fd4 | 183 | // CC channel value |
j3 | 2:02d228c25fd4 | 184 | // RR channel read back |
j3 | 2:02d228c25fd4 | 185 | |
j3 | 2:02d228c25fd4 | 186 | switch (channel) |
j3 | 2:02d228c25fd4 | 187 | { |
j3 | 2:02d228c25fd4 | 188 | default: case 0: ch = 0xF0; ch_read = 0xB8; break; |
j3 | 2:02d228c25fd4 | 189 | case 1: ch = 0xE1; ch_read = 0xB1; break; |
j3 | 2:02d228c25fd4 | 190 | case 2: ch = 0xD2; ch_read = 0xAA; break; |
j3 | 2:02d228c25fd4 | 191 | case 3: ch = 0xC3; ch_read = 0xA3; break; |
j3 | 2:02d228c25fd4 | 192 | case 4: ch = 0xB4; ch_read = 0x9C; break; |
j3 | 2:02d228c25fd4 | 193 | case 5: ch = 0xA5; ch_read = 0x95; break; |
j3 | 2:02d228c25fd4 | 194 | case 6: ch = 0x96; ch_read = 0x8E; break; |
j3 | 2:02d228c25fd4 | 195 | case 7: ch = 0x87; ch_read = 0x87; break; |
j3 | 2:02d228c25fd4 | 196 | }; |
j3 | 2:02d228c25fd4 | 197 | |
j3 | 2:02d228c25fd4 | 198 | packet[1] = ch; |
j3 | 2:02d228c25fd4 | 199 | |
j3 | 17:b646b1e3970b | 200 | if(_p_i2c_bus->write(_w_adrs, packet, 2) != I2C_WRITE_OK) |
j3 | 17:b646b1e3970b | 201 | { |
j3 | 23:e8e403d61359 | 202 | result = OneWireMaster::CommunicationWriteError; |
j3 | 17:b646b1e3970b | 203 | } |
j3 | 17:b646b1e3970b | 204 | else |
j3 | 17:b646b1e3970b | 205 | { |
j3 | 17:b646b1e3970b | 206 | if(_p_i2c_bus->read(_r_adrs, &check, 1) != I2C_READ_OK) |
j3 | 17:b646b1e3970b | 207 | { |
j3 | 23:e8e403d61359 | 208 | result = OneWireMaster::CommunicationReadError; |
j3 | 17:b646b1e3970b | 209 | } |
j3 | 17:b646b1e3970b | 210 | else |
j3 | 17:b646b1e3970b | 211 | { |
j3 | 17:b646b1e3970b | 212 | // check for failure due to incorrect read back of channel |
j3 | 17:b646b1e3970b | 213 | if (check == ch_read) |
j3 | 17:b646b1e3970b | 214 | { |
j3 | 23:e8e403d61359 | 215 | result = OneWireMaster::Success; |
j3 | 17:b646b1e3970b | 216 | } |
j3 | 17:b646b1e3970b | 217 | else |
j3 | 17:b646b1e3970b | 218 | { |
j3 | 23:e8e403d61359 | 219 | result = OneWireMaster::OperationFailure; |
j3 | 17:b646b1e3970b | 220 | } |
j3 | 17:b646b1e3970b | 221 | } |
j3 | 17:b646b1e3970b | 222 | } |
j3 | 2:02d228c25fd4 | 223 | |
j3 | 17:b646b1e3970b | 224 | return result; |
j3 | 2:02d228c25fd4 | 225 | } |
j3 | 2:02d228c25fd4 | 226 | |
j3 | 2:02d228c25fd4 | 227 | |
j3 | 2:02d228c25fd4 | 228 | //********************************************************************* |
j3 | 23:e8e403d61359 | 229 | OneWireMaster::CmdResult Ds248x::adjust_timing(uint8_t param, uint8_t val) |
j3 | 2:02d228c25fd4 | 230 | { |
j3 | 23:e8e403d61359 | 231 | OneWireMaster::CmdResult result; |
j3 | 17:b646b1e3970b | 232 | |
j3 | 2:02d228c25fd4 | 233 | char read_port_config; |
j3 | 2:02d228c25fd4 | 234 | char control_byte; |
j3 | 2:02d228c25fd4 | 235 | |
j3 | 2:02d228c25fd4 | 236 | control_byte = (((param & 0x0F) << 4) | (val & 0x0F)); |
j3 | 2:02d228c25fd4 | 237 | |
j3 | 2:02d228c25fd4 | 238 | char packet [] = {CMD_A1WP, control_byte}; |
j3 | 2:02d228c25fd4 | 239 | |
j3 | 17:b646b1e3970b | 240 | if(_p_i2c_bus->write(_w_adrs, packet, 2) != I2C_WRITE_OK) |
j3 | 17:b646b1e3970b | 241 | { |
j3 | 23:e8e403d61359 | 242 | result = OneWireMaster::CommunicationWriteError; |
j3 | 17:b646b1e3970b | 243 | } |
j3 | 17:b646b1e3970b | 244 | else |
j3 | 2:02d228c25fd4 | 245 | { |
j3 | 17:b646b1e3970b | 246 | if(_p_i2c_bus->read(_r_adrs, &read_port_config, 1) != I2C_READ_OK) |
j3 | 17:b646b1e3970b | 247 | { |
j3 | 23:e8e403d61359 | 248 | result = OneWireMaster::CommunicationReadError; |
j3 | 17:b646b1e3970b | 249 | } |
j3 | 17:b646b1e3970b | 250 | else |
j3 | 17:b646b1e3970b | 251 | { |
j3 | 17:b646b1e3970b | 252 | // check for failure due to incorrect read back |
j3 | 17:b646b1e3970b | 253 | if ((control_byte & 0x0F) != read_port_config) |
j3 | 17:b646b1e3970b | 254 | { |
j3 | 23:e8e403d61359 | 255 | result = OneWireMaster::OperationFailure; |
j3 | 17:b646b1e3970b | 256 | reset(); |
j3 | 17:b646b1e3970b | 257 | } |
j3 | 17:b646b1e3970b | 258 | else |
j3 | 17:b646b1e3970b | 259 | { |
j3 | 23:e8e403d61359 | 260 | result = OneWireMaster::Success; |
j3 | 17:b646b1e3970b | 261 | } |
j3 | 17:b646b1e3970b | 262 | } |
j3 | 2:02d228c25fd4 | 263 | } |
j3 | 17:b646b1e3970b | 264 | |
j3 | 17:b646b1e3970b | 265 | return result; |
j3 | 1:91e52f8ab8bf | 266 | } |
j3 | 1:91e52f8ab8bf | 267 | |
j3 | 1:91e52f8ab8bf | 268 | |
j3 | 1:91e52f8ab8bf | 269 | //********************************************************************* |
IanBenzMaxim | 32:bce180b544ed | 270 | OneWireMaster::CmdResult Ds248x::OWTriplet(SearchDirection & search_direction, std::uint8_t & sbr, std::uint8_t & tsb) |
j3 | 1:91e52f8ab8bf | 271 | { |
j3 | 23:e8e403d61359 | 272 | OneWireMaster::CmdResult result; |
j3 | 17:b646b1e3970b | 273 | |
j3 | 2:02d228c25fd4 | 274 | uint8_t poll_count = 0; |
j3 | 2:02d228c25fd4 | 275 | char packet [] = {CMD_1WT, search_direction ? 0x80 : 0x00}; |
j3 | 17:b646b1e3970b | 276 | char read_data; |
j3 | 2:02d228c25fd4 | 277 | |
j3 | 2:02d228c25fd4 | 278 | // 1-Wire Triplet (Case B) |
j3 | 2:02d228c25fd4 | 279 | // S AD,0 [A] 1WT [A] SS [A] Sr AD,1 [A] [Status] A [Status] A\ P |
j3 | 2:02d228c25fd4 | 280 | // \--------/ |
j3 | 2:02d228c25fd4 | 281 | // Repeat until 1WB bit has changed to 0 |
j3 | 2:02d228c25fd4 | 282 | // [] indicates from slave |
j3 | 2:02d228c25fd4 | 283 | // SS indicates byte containing search direction bit value in msbit |
j3 | 2:02d228c25fd4 | 284 | |
j3 | 17:b646b1e3970b | 285 | if(_p_i2c_bus->write(_w_adrs, packet, 2) != I2C_WRITE_OK) |
j3 | 2:02d228c25fd4 | 286 | { |
j3 | 23:e8e403d61359 | 287 | result = OneWireMaster::CommunicationWriteError; |
j3 | 2:02d228c25fd4 | 288 | } |
j3 | 2:02d228c25fd4 | 289 | else |
j3 | 2:02d228c25fd4 | 290 | { |
j3 | 17:b646b1e3970b | 291 | // loop checking 1WB bit for completion of 1-Wire operation |
j3 | 17:b646b1e3970b | 292 | // abort if poll limit reached |
j3 | 17:b646b1e3970b | 293 | |
j3 | 17:b646b1e3970b | 294 | //dummy write for loop |
j3 | 23:e8e403d61359 | 295 | result = OneWireMaster::Success; //so far |
j3 | 17:b646b1e3970b | 296 | do |
j3 | 17:b646b1e3970b | 297 | { |
j3 | 17:b646b1e3970b | 298 | if(_p_i2c_bus->read(_r_adrs, &read_data, 1) != I2C_READ_OK) |
j3 | 17:b646b1e3970b | 299 | { |
j3 | 23:e8e403d61359 | 300 | result = OneWireMaster::CommunicationReadError; |
j3 | 17:b646b1e3970b | 301 | } |
j3 | 17:b646b1e3970b | 302 | } |
j3 | 23:e8e403d61359 | 303 | while ((read_data & STATUS_1WB) && (poll_count++ < POLL_LIMIT) && (result != OneWireMaster::CommunicationReadError)); |
j3 | 17:b646b1e3970b | 304 | |
j3 | 23:e8e403d61359 | 305 | if((result == OneWireMaster::CommunicationReadError) || (poll_count >= POLL_LIMIT)) |
j3 | 17:b646b1e3970b | 306 | { |
j3 | 17:b646b1e3970b | 307 | // check for failure due to poll limit reached |
j3 | 17:b646b1e3970b | 308 | if(poll_count >= POLL_LIMIT) |
j3 | 17:b646b1e3970b | 309 | { |
j3 | 17:b646b1e3970b | 310 | // handle error |
j3 | 17:b646b1e3970b | 311 | // ... |
j3 | 17:b646b1e3970b | 312 | reset(); |
j3 | 23:e8e403d61359 | 313 | result = OneWireMaster::TimeoutError; |
j3 | 17:b646b1e3970b | 314 | } |
j3 | 17:b646b1e3970b | 315 | } |
j3 | 17:b646b1e3970b | 316 | else |
j3 | 17:b646b1e3970b | 317 | { |
IanBenzMaxim | 32:bce180b544ed | 318 | // check bit results in status byte |
IanBenzMaxim | 32:bce180b544ed | 319 | sbr = ((read_data & STATUS_SBR) == STATUS_SBR); |
IanBenzMaxim | 32:bce180b544ed | 320 | tsb = ((read_data & STATUS_TSB) == STATUS_TSB); |
IanBenzMaxim | 32:bce180b544ed | 321 | search_direction = ((read_data & STATUS_DIR) == STATUS_DIR) ? DIRECTION_WRITE_ONE : DIRECTION_WRITE_ZERO; |
IanBenzMaxim | 32:bce180b544ed | 322 | |
j3 | 23:e8e403d61359 | 323 | result = OneWireMaster::Success; |
j3 | 17:b646b1e3970b | 324 | } |
j3 | 2:02d228c25fd4 | 325 | } |
j3 | 17:b646b1e3970b | 326 | |
j3 | 17:b646b1e3970b | 327 | return result; |
j3 | 1:91e52f8ab8bf | 328 | } |
j3 | 1:91e52f8ab8bf | 329 | |
j3 | 1:91e52f8ab8bf | 330 | |
j3 | 1:91e52f8ab8bf | 331 | //********************************************************************* |
j3 | 23:e8e403d61359 | 332 | OneWireMaster::CmdResult Ds248x::OWReset(void) |
j3 | 2:02d228c25fd4 | 333 | { |
j3 | 23:e8e403d61359 | 334 | OneWireMaster::CmdResult result; |
j3 | 2:02d228c25fd4 | 335 | |
j3 | 2:02d228c25fd4 | 336 | uint8_t poll_count = 0; |
j3 | 2:02d228c25fd4 | 337 | char status; |
j3 | 2:02d228c25fd4 | 338 | char packet [] = {CMD_1WRS}; |
j3 | 1:91e52f8ab8bf | 339 | |
j3 | 2:02d228c25fd4 | 340 | // 1-Wire reset (Case B) |
j3 | 2:02d228c25fd4 | 341 | // S AD,0 [A] 1WRS [A] Sr AD,1 [A] [Status] A [Status] A\ P |
j3 | 2:02d228c25fd4 | 342 | // \--------/ |
j3 | 2:02d228c25fd4 | 343 | // Repeat until 1WB bit has changed to 0 |
j3 | 2:02d228c25fd4 | 344 | // [] indicates from slave |
j3 | 2:02d228c25fd4 | 345 | |
j3 | 17:b646b1e3970b | 346 | if(_p_i2c_bus->write(_w_adrs, packet, 1) != I2C_WRITE_OK) |
j3 | 2:02d228c25fd4 | 347 | { |
j3 | 23:e8e403d61359 | 348 | result = OneWireMaster::CommunicationWriteError; |
j3 | 2:02d228c25fd4 | 349 | } |
j3 | 2:02d228c25fd4 | 350 | else |
j3 | 2:02d228c25fd4 | 351 | { |
j3 | 17:b646b1e3970b | 352 | // loop checking 1WB bit for completion of 1-Wire operation |
j3 | 17:b646b1e3970b | 353 | // abort if poll limit reached |
j3 | 17:b646b1e3970b | 354 | //dummy write for loop |
j3 | 23:e8e403d61359 | 355 | result = OneWireMaster::Success; //so far |
j3 | 17:b646b1e3970b | 356 | do |
j3 | 2:02d228c25fd4 | 357 | { |
j3 | 17:b646b1e3970b | 358 | if(_p_i2c_bus->read(_r_adrs, &status, 1) != I2C_READ_OK) |
j3 | 17:b646b1e3970b | 359 | { |
j3 | 23:e8e403d61359 | 360 | result = OneWireMaster::CommunicationReadError; |
j3 | 17:b646b1e3970b | 361 | } |
j3 | 17:b646b1e3970b | 362 | } |
j3 | 23:e8e403d61359 | 363 | while ((status & STATUS_1WB) && (poll_count++ < POLL_LIMIT) && (result != OneWireMaster::CommunicationReadError)); |
j3 | 17:b646b1e3970b | 364 | |
j3 | 23:e8e403d61359 | 365 | if((result == OneWireMaster::CommunicationReadError) || (poll_count >= POLL_LIMIT)) |
j3 | 17:b646b1e3970b | 366 | { |
j3 | 17:b646b1e3970b | 367 | // check for failure due to poll limit reached |
j3 | 17:b646b1e3970b | 368 | if(poll_count >= POLL_LIMIT) |
j3 | 17:b646b1e3970b | 369 | { |
j3 | 17:b646b1e3970b | 370 | // handle error |
j3 | 17:b646b1e3970b | 371 | // ... |
j3 | 17:b646b1e3970b | 372 | reset(); |
j3 | 23:e8e403d61359 | 373 | result = OneWireMaster::TimeoutError; |
j3 | 17:b646b1e3970b | 374 | } |
j3 | 2:02d228c25fd4 | 375 | } |
j3 | 2:02d228c25fd4 | 376 | else |
j3 | 2:02d228c25fd4 | 377 | { |
j3 | 17:b646b1e3970b | 378 | // check for short condition |
j3 | 17:b646b1e3970b | 379 | if (status & STATUS_SD) |
j3 | 17:b646b1e3970b | 380 | { |
j3 | 17:b646b1e3970b | 381 | _short_detected = true; |
j3 | 17:b646b1e3970b | 382 | } |
j3 | 17:b646b1e3970b | 383 | else |
j3 | 17:b646b1e3970b | 384 | { |
j3 | 17:b646b1e3970b | 385 | _short_detected = false; |
j3 | 17:b646b1e3970b | 386 | } |
j3 | 17:b646b1e3970b | 387 | |
j3 | 17:b646b1e3970b | 388 | // check for presence detect |
j3 | 17:b646b1e3970b | 389 | if (status & STATUS_PPD) |
j3 | 17:b646b1e3970b | 390 | { |
j3 | 23:e8e403d61359 | 391 | result = OneWireMaster::Success; |
j3 | 17:b646b1e3970b | 392 | } |
j3 | 17:b646b1e3970b | 393 | else |
j3 | 17:b646b1e3970b | 394 | { |
j3 | 23:e8e403d61359 | 395 | result = OneWireMaster::OperationFailure; |
j3 | 17:b646b1e3970b | 396 | } |
j3 | 2:02d228c25fd4 | 397 | } |
j3 | 2:02d228c25fd4 | 398 | } |
j3 | 17:b646b1e3970b | 399 | |
j3 | 17:b646b1e3970b | 400 | return result; |
j3 | 1:91e52f8ab8bf | 401 | } |
j3 | 1:91e52f8ab8bf | 402 | |
j3 | 1:91e52f8ab8bf | 403 | |
j3 | 1:91e52f8ab8bf | 404 | //********************************************************************* |
IanBenzMaxim | 32:bce180b544ed | 405 | OneWireMaster::CmdResult Ds248x::OWTouchBit(uint8_t & sendrecvbit, OWLevel after_level) |
j3 | 1:91e52f8ab8bf | 406 | { |
j3 | 23:e8e403d61359 | 407 | OneWireMaster::CmdResult result; |
j3 | 17:b646b1e3970b | 408 | |
IanBenzMaxim | 26:a361e3f42ba5 | 409 | result = ConfigureSPU(after_level == LEVEL_STRONG); |
IanBenzMaxim | 26:a361e3f42ba5 | 410 | if (result != OneWireMaster::Success) |
IanBenzMaxim | 26:a361e3f42ba5 | 411 | return result; |
IanBenzMaxim | 26:a361e3f42ba5 | 412 | |
j3 | 2:02d228c25fd4 | 413 | uint8_t poll_count = 0; |
j3 | 2:02d228c25fd4 | 414 | char status; |
j3 | 17:b646b1e3970b | 415 | char packet[] = {CMD_1WSB, sendrecvbit ? 0x80 : 0x00}; |
j3 | 2:02d228c25fd4 | 416 | |
j3 | 2:02d228c25fd4 | 417 | // 1-Wire bit (Case B) |
j3 | 2:02d228c25fd4 | 418 | // S AD,0 [A] 1WSB [A] BB [A] Sr AD,1 [A] [Status] A [Status] A\ P |
j3 | 2:02d228c25fd4 | 419 | // \--------/ |
j3 | 2:02d228c25fd4 | 420 | // Repeat until 1WB bit has changed to 0 |
j3 | 2:02d228c25fd4 | 421 | // [] indicates from slave |
j3 | 2:02d228c25fd4 | 422 | // BB indicates byte containing bit value in msbit |
j3 | 2:02d228c25fd4 | 423 | |
j3 | 17:b646b1e3970b | 424 | if(_p_i2c_bus->write(_w_adrs, packet, 2) != I2C_WRITE_OK) |
j3 | 2:02d228c25fd4 | 425 | { |
j3 | 23:e8e403d61359 | 426 | result = OneWireMaster::CommunicationWriteError; |
j3 | 2:02d228c25fd4 | 427 | } |
j3 | 2:02d228c25fd4 | 428 | else |
j3 | 2:02d228c25fd4 | 429 | { |
j3 | 17:b646b1e3970b | 430 | // loop checking 1WB bit for completion of 1-Wire operation |
j3 | 17:b646b1e3970b | 431 | // abort if poll limit reached |
j3 | 17:b646b1e3970b | 432 | //dummy write for loop |
j3 | 23:e8e403d61359 | 433 | result = OneWireMaster::Success; //so far |
j3 | 17:b646b1e3970b | 434 | do |
j3 | 2:02d228c25fd4 | 435 | { |
j3 | 17:b646b1e3970b | 436 | if(_p_i2c_bus->read(_r_adrs, &status, 1) != I2C_READ_OK) |
j3 | 17:b646b1e3970b | 437 | { |
j3 | 23:e8e403d61359 | 438 | result = OneWireMaster::CommunicationReadError; |
j3 | 17:b646b1e3970b | 439 | } |
j3 | 17:b646b1e3970b | 440 | } |
j3 | 23:e8e403d61359 | 441 | while ((status & STATUS_1WB) && (poll_count++ < POLL_LIMIT) && (result != OneWireMaster::CommunicationReadError)); |
j3 | 17:b646b1e3970b | 442 | |
j3 | 23:e8e403d61359 | 443 | if((result == OneWireMaster::CommunicationReadError) || (poll_count >= POLL_LIMIT)) |
j3 | 17:b646b1e3970b | 444 | { |
j3 | 17:b646b1e3970b | 445 | // check for failure due to poll limit reached |
j3 | 17:b646b1e3970b | 446 | if (poll_count >= POLL_LIMIT) |
j3 | 17:b646b1e3970b | 447 | { |
j3 | 17:b646b1e3970b | 448 | // handle error |
j3 | 17:b646b1e3970b | 449 | // ... |
j3 | 17:b646b1e3970b | 450 | reset(); |
j3 | 23:e8e403d61359 | 451 | result = OneWireMaster::TimeoutError; |
j3 | 17:b646b1e3970b | 452 | } |
j3 | 2:02d228c25fd4 | 453 | } |
j3 | 2:02d228c25fd4 | 454 | else |
j3 | 2:02d228c25fd4 | 455 | { |
j3 | 17:b646b1e3970b | 456 | // return bit state through out param |
j3 | 17:b646b1e3970b | 457 | if (status & STATUS_SBR) |
j3 | 17:b646b1e3970b | 458 | { |
j3 | 17:b646b1e3970b | 459 | sendrecvbit = 1; |
j3 | 17:b646b1e3970b | 460 | |
j3 | 17:b646b1e3970b | 461 | } |
j3 | 17:b646b1e3970b | 462 | else |
j3 | 17:b646b1e3970b | 463 | { |
j3 | 17:b646b1e3970b | 464 | sendrecvbit = 0; |
j3 | 17:b646b1e3970b | 465 | } |
j3 | 23:e8e403d61359 | 466 | result = OneWireMaster::Success; |
j3 | 2:02d228c25fd4 | 467 | } |
j3 | 2:02d228c25fd4 | 468 | } |
j3 | 17:b646b1e3970b | 469 | |
j3 | 17:b646b1e3970b | 470 | return result; |
j3 | 1:91e52f8ab8bf | 471 | } |
j3 | 1:91e52f8ab8bf | 472 | |
j3 | 1:91e52f8ab8bf | 473 | |
j3 | 1:91e52f8ab8bf | 474 | //********************************************************************* |
IanBenzMaxim | 32:bce180b544ed | 475 | OneWireMaster::CmdResult Ds248x::OWWriteByte(uint8_t sendbyte, OWLevel after_level) |
j3 | 1:91e52f8ab8bf | 476 | { |
j3 | 23:e8e403d61359 | 477 | OneWireMaster::CmdResult result; |
j3 | 1:91e52f8ab8bf | 478 | |
IanBenzMaxim | 26:a361e3f42ba5 | 479 | result = ConfigureSPU(after_level == LEVEL_STRONG); |
IanBenzMaxim | 26:a361e3f42ba5 | 480 | if (result != OneWireMaster::Success) |
IanBenzMaxim | 26:a361e3f42ba5 | 481 | return result; |
IanBenzMaxim | 26:a361e3f42ba5 | 482 | |
j3 | 2:02d228c25fd4 | 483 | uint8_t poll_count = 0; |
j3 | 2:02d228c25fd4 | 484 | char status; |
j3 | 2:02d228c25fd4 | 485 | char packet [] = {CMD_1WWB, sendbyte}; |
j3 | 2:02d228c25fd4 | 486 | |
j3 | 2:02d228c25fd4 | 487 | // 1-Wire Write Byte (Case B) |
j3 | 2:02d228c25fd4 | 488 | // S AD,0 [A] 1WWB [A] DD [A] Sr AD,1 [A] [Status] A [Status] A\ P |
j3 | 2:02d228c25fd4 | 489 | // \--------/ |
j3 | 2:02d228c25fd4 | 490 | // Repeat until 1WB bit has changed to 0 |
j3 | 2:02d228c25fd4 | 491 | // [] indicates from slave |
j3 | 2:02d228c25fd4 | 492 | // DD data to write |
j3 | 2:02d228c25fd4 | 493 | |
j3 | 17:b646b1e3970b | 494 | if(_p_i2c_bus->write(_w_adrs, packet, 2) != I2C_WRITE_OK) |
j3 | 2:02d228c25fd4 | 495 | { |
j3 | 23:e8e403d61359 | 496 | result = OneWireMaster::CommunicationWriteError; |
j3 | 2:02d228c25fd4 | 497 | } |
j3 | 2:02d228c25fd4 | 498 | else |
j3 | 2:02d228c25fd4 | 499 | { |
j3 | 17:b646b1e3970b | 500 | // loop checking 1WB bit for completion of 1-Wire operation |
j3 | 17:b646b1e3970b | 501 | // abort if poll limit reached |
j3 | 17:b646b1e3970b | 502 | //dummy write for loop |
j3 | 23:e8e403d61359 | 503 | result = OneWireMaster::Success; //so far |
j3 | 17:b646b1e3970b | 504 | do |
j3 | 17:b646b1e3970b | 505 | { |
j3 | 17:b646b1e3970b | 506 | if(_p_i2c_bus->read(_r_adrs, &status, 1) != I2C_READ_OK) |
j3 | 17:b646b1e3970b | 507 | { |
j3 | 23:e8e403d61359 | 508 | result = OneWireMaster::CommunicationReadError; |
j3 | 17:b646b1e3970b | 509 | } |
j3 | 17:b646b1e3970b | 510 | } |
j3 | 23:e8e403d61359 | 511 | while ((status & STATUS_1WB) && (poll_count++ < POLL_LIMIT) && (result != OneWireMaster::CommunicationReadError)); |
j3 | 17:b646b1e3970b | 512 | |
j3 | 23:e8e403d61359 | 513 | if((result == OneWireMaster::CommunicationReadError) || (poll_count >= POLL_LIMIT)) |
j3 | 17:b646b1e3970b | 514 | { |
j3 | 17:b646b1e3970b | 515 | // check for failure due to poll limit reached |
j3 | 17:b646b1e3970b | 516 | if (poll_count >= POLL_LIMIT) |
j3 | 17:b646b1e3970b | 517 | { |
j3 | 17:b646b1e3970b | 518 | // handle error |
j3 | 17:b646b1e3970b | 519 | // ... |
j3 | 17:b646b1e3970b | 520 | reset(); |
j3 | 23:e8e403d61359 | 521 | result = OneWireMaster::TimeoutError; |
j3 | 17:b646b1e3970b | 522 | } |
j3 | 17:b646b1e3970b | 523 | } |
j3 | 17:b646b1e3970b | 524 | else |
j3 | 17:b646b1e3970b | 525 | { |
j3 | 23:e8e403d61359 | 526 | result = OneWireMaster::Success; |
j3 | 17:b646b1e3970b | 527 | } |
j3 | 2:02d228c25fd4 | 528 | } |
j3 | 2:02d228c25fd4 | 529 | |
j3 | 17:b646b1e3970b | 530 | return result; |
j3 | 1:91e52f8ab8bf | 531 | } |
j3 | 1:91e52f8ab8bf | 532 | |
j3 | 1:91e52f8ab8bf | 533 | |
j3 | 1:91e52f8ab8bf | 534 | //********************************************************************* |
IanBenzMaxim | 32:bce180b544ed | 535 | OneWireMaster::CmdResult Ds248x::OWReadByte(uint8_t & recvbyte, OWLevel after_level) |
j3 | 1:91e52f8ab8bf | 536 | { |
j3 | 23:e8e403d61359 | 537 | OneWireMaster::CmdResult result; |
j3 | 2:02d228c25fd4 | 538 | |
IanBenzMaxim | 26:a361e3f42ba5 | 539 | if (after_level == LEVEL_STRONG) // Enabling strong pull-up after a Read Byte command is not supported natively by the DS248x |
j3 | 2:02d228c25fd4 | 540 | { |
IanBenzMaxim | 26:a361e3f42ba5 | 541 | uint8_t recvbit; |
IanBenzMaxim | 26:a361e3f42ba5 | 542 | recvbyte = 0; |
IanBenzMaxim | 26:a361e3f42ba5 | 543 | |
IanBenzMaxim | 26:a361e3f42ba5 | 544 | for (unsigned int i = 1; i <= 8; i++) |
IanBenzMaxim | 26:a361e3f42ba5 | 545 | { |
IanBenzMaxim | 26:a361e3f42ba5 | 546 | // Set strong pull-up on last bit |
IanBenzMaxim | 26:a361e3f42ba5 | 547 | result = OWReadBit(recvbit, (i == 8 ? LEVEL_STRONG : LEVEL_NORMAL)); |
IanBenzMaxim | 26:a361e3f42ba5 | 548 | if (result != Success) |
IanBenzMaxim | 26:a361e3f42ba5 | 549 | break; |
IanBenzMaxim | 26:a361e3f42ba5 | 550 | recvbyte = (recvbyte << 1) | recvbit; |
IanBenzMaxim | 26:a361e3f42ba5 | 551 | } |
j3 | 2:02d228c25fd4 | 552 | } |
j3 | 2:02d228c25fd4 | 553 | else |
j3 | 2:02d228c25fd4 | 554 | { |
IanBenzMaxim | 26:a361e3f42ba5 | 555 | uint8_t poll_count = 0; |
IanBenzMaxim | 26:a361e3f42ba5 | 556 | char data, status; |
IanBenzMaxim | 26:a361e3f42ba5 | 557 | char packet[2] = {CMD_1WRB, 0}; |
IanBenzMaxim | 26:a361e3f42ba5 | 558 | |
IanBenzMaxim | 26:a361e3f42ba5 | 559 | // 1-Wire Read Bytes (Case C) |
IanBenzMaxim | 26:a361e3f42ba5 | 560 | // S AD,0 [A] 1WRB [A] Sr AD,1 [A] [Status] A [Status] A\ |
IanBenzMaxim | 26:a361e3f42ba5 | 561 | // \--------/ |
IanBenzMaxim | 26:a361e3f42ba5 | 562 | // Repeat until 1WB bit has changed to 0 |
IanBenzMaxim | 26:a361e3f42ba5 | 563 | // Sr AD,0 [A] SRP [A] E1 [A] Sr AD,1 [A] DD A\ P |
IanBenzMaxim | 26:a361e3f42ba5 | 564 | // |
IanBenzMaxim | 26:a361e3f42ba5 | 565 | // [] indicates from slave |
IanBenzMaxim | 26:a361e3f42ba5 | 566 | // DD data read |
IanBenzMaxim | 26:a361e3f42ba5 | 567 | |
IanBenzMaxim | 26:a361e3f42ba5 | 568 | if(_p_i2c_bus->write(_w_adrs, packet, 1) != I2C_WRITE_OK) |
j3 | 17:b646b1e3970b | 569 | { |
IanBenzMaxim | 26:a361e3f42ba5 | 570 | result = OneWireMaster::CommunicationWriteError; |
j3 | 17:b646b1e3970b | 571 | } |
j3 | 17:b646b1e3970b | 572 | else |
j3 | 17:b646b1e3970b | 573 | { |
IanBenzMaxim | 26:a361e3f42ba5 | 574 | // loop checking 1WB bit for completion of 1-Wire operation |
IanBenzMaxim | 26:a361e3f42ba5 | 575 | // abort if poll limit reached |
IanBenzMaxim | 26:a361e3f42ba5 | 576 | //dummy write for loop |
IanBenzMaxim | 26:a361e3f42ba5 | 577 | result = OneWireMaster::Success; //so far |
IanBenzMaxim | 26:a361e3f42ba5 | 578 | do |
j3 | 17:b646b1e3970b | 579 | { |
IanBenzMaxim | 26:a361e3f42ba5 | 580 | if(_p_i2c_bus->read(_r_adrs, &status, 1) != I2C_READ_OK) |
IanBenzMaxim | 26:a361e3f42ba5 | 581 | { |
IanBenzMaxim | 26:a361e3f42ba5 | 582 | result = OneWireMaster::CommunicationReadError; |
IanBenzMaxim | 26:a361e3f42ba5 | 583 | } |
IanBenzMaxim | 26:a361e3f42ba5 | 584 | } |
IanBenzMaxim | 26:a361e3f42ba5 | 585 | while ((status & STATUS_1WB) && (poll_count++ < POLL_LIMIT) && (result != OneWireMaster::CommunicationReadError)); |
IanBenzMaxim | 26:a361e3f42ba5 | 586 | |
IanBenzMaxim | 26:a361e3f42ba5 | 587 | if((result == OneWireMaster::CommunicationReadError) || (poll_count >= POLL_LIMIT)) |
IanBenzMaxim | 26:a361e3f42ba5 | 588 | { |
IanBenzMaxim | 26:a361e3f42ba5 | 589 | // check for failure due to poll limit reached |
IanBenzMaxim | 26:a361e3f42ba5 | 590 | if (poll_count >= POLL_LIMIT) |
IanBenzMaxim | 26:a361e3f42ba5 | 591 | { |
IanBenzMaxim | 26:a361e3f42ba5 | 592 | // handle error |
IanBenzMaxim | 26:a361e3f42ba5 | 593 | // ... |
IanBenzMaxim | 26:a361e3f42ba5 | 594 | reset(); |
IanBenzMaxim | 26:a361e3f42ba5 | 595 | result = OneWireMaster::TimeoutError; |
IanBenzMaxim | 26:a361e3f42ba5 | 596 | } |
j3 | 17:b646b1e3970b | 597 | } |
j3 | 17:b646b1e3970b | 598 | else |
j3 | 17:b646b1e3970b | 599 | { |
IanBenzMaxim | 26:a361e3f42ba5 | 600 | packet[0] = CMD_SRP; |
IanBenzMaxim | 26:a361e3f42ba5 | 601 | packet[1] = 0xE1; |
IanBenzMaxim | 26:a361e3f42ba5 | 602 | |
IanBenzMaxim | 26:a361e3f42ba5 | 603 | if(_p_i2c_bus->write(_w_adrs, packet, 2) != I2C_WRITE_OK) |
j3 | 17:b646b1e3970b | 604 | { |
IanBenzMaxim | 26:a361e3f42ba5 | 605 | result = OneWireMaster::CommunicationWriteError; |
j3 | 17:b646b1e3970b | 606 | } |
j3 | 17:b646b1e3970b | 607 | else |
j3 | 17:b646b1e3970b | 608 | { |
IanBenzMaxim | 26:a361e3f42ba5 | 609 | if(_p_i2c_bus->read(_r_adrs, &data, 1) != I2C_READ_OK) |
IanBenzMaxim | 26:a361e3f42ba5 | 610 | { |
IanBenzMaxim | 26:a361e3f42ba5 | 611 | result = OneWireMaster::CommunicationReadError; |
IanBenzMaxim | 26:a361e3f42ba5 | 612 | } |
IanBenzMaxim | 26:a361e3f42ba5 | 613 | else |
IanBenzMaxim | 26:a361e3f42ba5 | 614 | { |
IanBenzMaxim | 26:a361e3f42ba5 | 615 | recvbyte = data; |
IanBenzMaxim | 26:a361e3f42ba5 | 616 | result = OneWireMaster::Success; |
IanBenzMaxim | 26:a361e3f42ba5 | 617 | } |
j3 | 17:b646b1e3970b | 618 | } |
j3 | 17:b646b1e3970b | 619 | } |
j3 | 17:b646b1e3970b | 620 | } |
j3 | 2:02d228c25fd4 | 621 | } |
j3 | 2:02d228c25fd4 | 622 | |
j3 | 17:b646b1e3970b | 623 | return result; |
j3 | 17:b646b1e3970b | 624 | } |
j3 | 17:b646b1e3970b | 625 | |
j3 | 17:b646b1e3970b | 626 | |
j3 | 17:b646b1e3970b | 627 | //********************************************************************* |
j3 | 23:e8e403d61359 | 628 | OneWireMaster::CmdResult Ds248x::OWWriteBlock(const uint8_t *tran_buf, uint8_t tran_len) |
j3 | 17:b646b1e3970b | 629 | { |
j3 | 23:e8e403d61359 | 630 | OneWireMaster::CmdResult result; |
j3 | 17:b646b1e3970b | 631 | |
j3 | 17:b646b1e3970b | 632 | for(uint8_t idx = 0; idx < tran_len; idx++) |
j3 | 17:b646b1e3970b | 633 | { |
IanBenzMaxim | 26:a361e3f42ba5 | 634 | result = OneWireMaster::OWWriteByte(tran_buf[idx]); |
j3 | 23:e8e403d61359 | 635 | if(result != OneWireMaster::Success) |
j3 | 17:b646b1e3970b | 636 | { |
j3 | 17:b646b1e3970b | 637 | break; |
j3 | 17:b646b1e3970b | 638 | } |
j3 | 17:b646b1e3970b | 639 | } |
j3 | 17:b646b1e3970b | 640 | |
j3 | 17:b646b1e3970b | 641 | return result; |
j3 | 17:b646b1e3970b | 642 | } |
j3 | 17:b646b1e3970b | 643 | |
j3 | 17:b646b1e3970b | 644 | |
j3 | 17:b646b1e3970b | 645 | //********************************************************************* |
j3 | 23:e8e403d61359 | 646 | OneWireMaster::CmdResult Ds248x::OWReadBlock(uint8_t *rx_buf, uint8_t rx_len) |
j3 | 17:b646b1e3970b | 647 | { |
j3 | 23:e8e403d61359 | 648 | OneWireMaster::CmdResult result; |
j3 | 17:b646b1e3970b | 649 | |
j3 | 17:b646b1e3970b | 650 | for(uint8_t idx = 0; idx < rx_len; idx++) |
j3 | 17:b646b1e3970b | 651 | { |
j3 | 17:b646b1e3970b | 652 | //OwReadByte() uses pass by reference |
IanBenzMaxim | 26:a361e3f42ba5 | 653 | result = OneWireMaster::OWReadByte(rx_buf[idx]); |
j3 | 23:e8e403d61359 | 654 | if(result != OneWireMaster::Success) |
j3 | 17:b646b1e3970b | 655 | { |
j3 | 17:b646b1e3970b | 656 | break; |
j3 | 17:b646b1e3970b | 657 | } |
j3 | 17:b646b1e3970b | 658 | } |
j3 | 17:b646b1e3970b | 659 | |
j3 | 17:b646b1e3970b | 660 | return result; |
j3 | 1:91e52f8ab8bf | 661 | } |
j3 | 1:91e52f8ab8bf | 662 | |
j3 | 1:91e52f8ab8bf | 663 | |
j3 | 1:91e52f8ab8bf | 664 | //********************************************************************* |
IanBenzMaxim | 32:bce180b544ed | 665 | OneWireMaster::CmdResult Ds248x::OWSetSpeed(OWSpeed new_speed) |
j3 | 1:91e52f8ab8bf | 666 | { |
j3 | 2:02d228c25fd4 | 667 | // set the speed |
j3 | 5:ce108eeb878d | 668 | if (new_speed == SPEED_OVERDRIVE) |
j3 | 2:02d228c25fd4 | 669 | { |
j3 | 2:02d228c25fd4 | 670 | _c1WS = CONFIG_1WS; |
j3 | 2:02d228c25fd4 | 671 | } |
j3 | 2:02d228c25fd4 | 672 | else |
j3 | 2:02d228c25fd4 | 673 | { |
j3 | 17:b646b1e3970b | 674 | _c1WS = 0; |
j3 | 2:02d228c25fd4 | 675 | } |
j3 | 2:02d228c25fd4 | 676 | |
j3 | 17:b646b1e3970b | 677 | // write the new config, and return result of op |
j3 | 17:b646b1e3970b | 678 | return write_config(_c1WS | _cSPU | _cPDN | _cAPU); |
j3 | 1:91e52f8ab8bf | 679 | } |
j3 | 1:91e52f8ab8bf | 680 | |
j3 | 1:91e52f8ab8bf | 681 | |
j3 | 1:91e52f8ab8bf | 682 | //********************************************************************* |
IanBenzMaxim | 32:bce180b544ed | 683 | OneWireMaster::CmdResult Ds248x::OWSetLevel(OWLevel new_level) |
j3 | 1:91e52f8ab8bf | 684 | { |
j3 | 23:e8e403d61359 | 685 | OneWireMaster::CmdResult result; |
j3 | 2:02d228c25fd4 | 686 | |
j3 | 2:02d228c25fd4 | 687 | // function only will turn back to non-strong pull-up |
j3 | 5:ce108eeb878d | 688 | if (new_level != LEVEL_NORMAL) |
j3 | 2:02d228c25fd4 | 689 | { |
j3 | 23:e8e403d61359 | 690 | result = OneWireMaster::OperationFailure; |
j3 | 2:02d228c25fd4 | 691 | } |
j3 | 2:02d228c25fd4 | 692 | else |
j3 | 2:02d228c25fd4 | 693 | { |
j3 | 2:02d228c25fd4 | 694 | // clear the strong pull-up bit in the global config state |
j3 | 17:b646b1e3970b | 695 | _cSPU = 0; |
j3 | 17:b646b1e3970b | 696 | |
j3 | 17:b646b1e3970b | 697 | result = write_config(_c1WS | _cSPU | _cPDN | _cAPU); |
j3 | 2:02d228c25fd4 | 698 | } |
j3 | 2:02d228c25fd4 | 699 | |
j3 | 17:b646b1e3970b | 700 | return result; |
j3 | 1:91e52f8ab8bf | 701 | } |
j3 | 1:91e52f8ab8bf | 702 | |
j3 | 1:91e52f8ab8bf | 703 | |
IanBenzMaxim | 26:a361e3f42ba5 | 704 | OneWireMaster::CmdResult Ds248x::ConfigureSPU(bool spu_enable) |
j3 | 1:91e52f8ab8bf | 705 | { |
IanBenzMaxim | 26:a361e3f42ba5 | 706 | OneWireMaster::CmdResult result; |
IanBenzMaxim | 26:a361e3f42ba5 | 707 | if ((_cSPU == CONFIG_SPU) != spu_enable) |
IanBenzMaxim | 26:a361e3f42ba5 | 708 | { |
IanBenzMaxim | 26:a361e3f42ba5 | 709 | _cSPU = spu_enable; |
IanBenzMaxim | 26:a361e3f42ba5 | 710 | result = write_config(_c1WS | _cSPU | _cPDN | _cAPU); |
IanBenzMaxim | 26:a361e3f42ba5 | 711 | } |
IanBenzMaxim | 26:a361e3f42ba5 | 712 | else |
IanBenzMaxim | 26:a361e3f42ba5 | 713 | { |
IanBenzMaxim | 26:a361e3f42ba5 | 714 | result = OneWireMaster::Success; |
IanBenzMaxim | 26:a361e3f42ba5 | 715 | } |
IanBenzMaxim | 26:a361e3f42ba5 | 716 | return result; |
IanBenzMaxim | 21:00c94aeb533e | 717 | } |
IanBenzMaxim | 21:00c94aeb533e | 718 | |
IanBenzMaxim | 21:00c94aeb533e | 719 | |
j3 | 1:91e52f8ab8bf | 720 | //********************************************************************* |
j3 | 6:1faafa0b3cd7 | 721 | void Ds248x::set_i2c_adrs(DS248X_I2C_ADRS adrs) |
j3 | 6:1faafa0b3cd7 | 722 | { |
j3 | 6:1faafa0b3cd7 | 723 | _w_adrs = (adrs << 1); |
j3 | 6:1faafa0b3cd7 | 724 | _r_adrs = (_w_adrs | 1); |
j3 | 6:1faafa0b3cd7 | 725 | } |