Implementation of 1-Wire with added Alarm Search Functionality
Dependents: Max32630_One_Wire_Interface
Masters/OneWireMaster.cpp
- Committer:
- IanBenzMaxim
- Date:
- 2016-05-14
- Revision:
- 76:84e6c4994e29
- Parent:
- 75:8b627804927c
- Child:
- 77:529edb329ee0
File content as of revision 76:84e6c4994e29:
/******************************************************************//** * Copyright (C) 2016 Maxim Integrated Products, Inc., All Rights Reserved. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included * in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR * OTHER DEALINGS IN THE SOFTWARE. * * Except as contained in this notice, the name of Maxim Integrated * Products, Inc. shall not be used except as stated in the Maxim Integrated * Products, Inc. Branding Policy. * * The mere transfer of this software does not imply any licenses * of trade secrets, proprietary technology, copyrights, patents, * trademarks, maskwork rights, or any other form of intellectual * property whatsoever. Maxim Integrated Products, Inc. retains all * ownership rights. **********************************************************************/ #include "OneWireMaster.h" #include "RomId.h" using OneWire::OneWireMaster; OneWireMaster::CmdResult OneWireMaster::OWWriteBlock(const uint8_t *sendBuf, uint8_t sendLen) { CmdResult result; for (uint8_t idx = 0; idx < sendLen; idx++) { result = OWWriteByte(sendBuf[idx]); if (result != Success) { break; } } return result; } OneWireMaster::CmdResult OneWireMaster::OWReadBlock(uint8_t *recvBuf, uint8_t recvLen) { CmdResult result; for (uint8_t idx = 0; idx < recvLen; idx++) { result = OWReadByte(recvBuf[idx]); if (result != Success) { break; } } return result; } OneWireMaster::CmdResult OneWireMaster::OWTriplet(SearchDirection & searchDirection, uint8_t & sbr, uint8_t & tsb) { CmdResult result; result = OWReadBit(sbr); if (result == Success) { result = OWReadBit(tsb); } if (result == Success) { if (sbr) { searchDirection = WriteOne; } else if (tsb) { searchDirection = WriteZero; } // else: use search_direction parameter result = OWWriteBit((searchDirection == WriteOne) ? 1 : 0); } return result; } uint16_t OneWireMaster::calculateCrc16(uint16_t crc16, uint16_t data) { const uint16_t oddparity[] = { 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0 }; data = (data ^ (crc16 & 0xff)) & 0xff; crc16 >>= 8; if (oddparity[data & 0xf] ^ oddparity[data >> 4]) { crc16 ^= 0xc001; } data <<= 6; crc16 ^= data; data <<= 1; crc16 ^= data; return crc16; } uint16_t OneWireMaster::calculateCrc16(const uint8_t * data, size_t dataOffset, size_t dataLen, uint16_t crc) { for (size_t i = dataOffset; i < (dataLen + dataOffset); i++) { crc = calculateCrc16(crc, data[i]); } return crc; }