64 lines
1.8 KiB
C
64 lines
1.8 KiB
C
/**
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* Calculation of CRC 16 CCITT polynomial.
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*
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* @file crc16-ccitt.h
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* @ingroup CO_crc16_ccitt
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* @version SVN: \$Id$
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* @author Lammert Bies
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* @author Janez Paternoster
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* @copyright 2012 - 2013 Janez Paternoster
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*
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* This file is part of CANopenNode, an opensource CANopen Stack.
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* Project home page is <http://canopennode.sourceforge.net>.
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* For more information on CANopen see <http://www.can-cia.org/>.
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*
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* CANopenNode is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef CRC16_CCITT_H
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#define CRC16_CCITT_H
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/**
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* @defgroup CO_crc16_ccitt CRC 16 CCITT
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* @ingroup CO_CANopen
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* @{
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*
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* Calculation of CRC 16 CCITT polynomial.
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*
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* Equation:
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*
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* `x^16 + x^12 + x^5 + 1`
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*/
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/**
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* Calculate CRC sum on block of data.
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*
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* @param block Pointer to block of data.
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* @param blockLength Length of data in bytes;
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* @param crc Initial value (zero for xmodem). If block is split into
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* multiple segments, previous CRC is used as initial.
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*
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* @return Calculated CRC.
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*/
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unsigned short crc16_ccitt(
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const unsigned char block[],
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unsigned int blockLength,
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unsigned short crc);
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/** @} */
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#endif
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