Maxim Integrated / OneWire

1-Wire® library for mbed. Complete 1-Wire library that supports our silicon masters along with a bit-bang master on the MAX32600MBED platform with one common interface for mbed. Slave support has also been included and more slaves will be added as time permits.

Dependents:   MAXREFDES131_Qt_Demo MAX32630FTHR_iButton_uSD_Logger MAX32630FTHR_DS18B20_uSD_Logger MAXREFDES130_131_Demo ... more

Superseded by MaximInterface.

crc.cpp

Committer:
IanBenzMaxim
Date:
2016-05-16
Revision:
78:0cbbac7f2016
Child:
80:83b0d879cc32

File content as of revision 78:0cbbac7f2016:

#include "crc.h"

uint16_t OneWire::crc::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 OneWire::crc::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;
}