CRC 8-bit

crc8.cpp

// CRC-8 - based on the CRC8 formulas by Dallas/Maxim
// code released under the therms of the GNU GPL 3.0 license
// Found at: http://www.leonardomiliani.com/en/2013/un-semplice-crc8-per-arduino/
uint8_t SerialPacket::_crc8(const uint8_t *data, uint8_t len) {
    uint8_t crc = 0x00;
    while (len--) {
        uint8_t extract = *data++;
        for (uint8_t tempI = 8; tempI; tempI--) {
            uint8_t sum = (crc ^ extract) & 0x01;
            crc >>= 1;
            if (sum) {
                crc ^= 0x8C;
            }
            extract >>= 1;
        }
    }
    return crc;
}