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Superseded by MaximInterface.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:
- j3
- Date:
- 2016-06-02
- Revision:
- 80:83b0d879cc32
- Parent:
- 78:0cbbac7f2016
File content as of revision 80:83b0d879cc32:
#include "crc.h" uint8_t OneWire::crc::calculateCrc8(uint8_t crc8, uint8_t data) { // See Application Note 27 crc8 = crc8 ^ data; for (int i = 0; i < 8; i++) { if (crc8 & 1) { crc8 = (crc8 >> 1) ^ 0x8c; } else { crc8 = (crc8 >> 1); } } return crc8; } uint8_t OneWire::crc::calculateCrc8(const uint8_t * data, size_t dataLen, uint8_t crc) { for (size_t i = 0; i < dataLen; i++) { crc = calculateCrc8(crc, data[i]); } return crc; } 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; }