link_mcu_hw.h

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/*  $Id: link_mcu_hw.h 2064 2007-11-23 12:35:50Z hecto $
 *
 * Copyright (C) 2003-2005  Pascal Brisset, Antoine Drouin
 *
 * This file is part of paparazzi.
 *
 * paparazzi 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 2, or (at your option)
 * any later version.
 *
 * paparazzi 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 for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with paparazzi; see the file COPYING.  If not, write to
 * the Free Software Foundation, 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 */
 
#ifndef LINK_MCU_HW_H
#define LINK_MCU_HW_H
 
#define CRC_INIT 0x0
#define CrcLow(x) ((x)&0xff)
#define CrcHigh(x) ((x)>>8)
 
static inline uint16_t CrcUpdate(uint16_t crc, uint8_t data)
{
  uint8_t a = ((uint8_t)CrcHigh(crc)) + data;
  uint8_t b = ((uint8_t)CrcLow(crc)) + a;
  crc = b | a << 8;
  return crc;
}
 
#endif /* LINK_MCU_HW_H */