crc.h

#ifndef CRC_H
#define CRC_H

#include <inttypes.h>

/*
 *  Copyright © 2010-2015, Matthias Urlichs <matthias@urlichs.de>
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License (included; see the file LICENSE)
 *  for more details.
 */

/* Incrementally calculate CRC.
   Initially, 'crc' is zero.
   Calculate crc=crc16(crc,byte) for each byte sent/received.
   After sending the last data byte, send crc^0xFFFF (LSB first).
   After receiving data+crc, crc should be 0xB001.
 */
uint16_t crc16(uint16_t crc, uint8_t x);

#endif // crc.h