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
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**********************************************************************/

#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;
}