Implementation of 1-Wire with added Alarm Search Functionality
Dependents: Max32630_One_Wire_Interface
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; }