91 lines
2.9 KiB
C
91 lines
2.9 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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* @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 <https://github.com/CANopenNode/CANopenNode>.
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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 and open source software: you can redistribute
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* it and/or modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation, either version 2 of the
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* License, or (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 General Public License for more details.
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*
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* You should have received a copy of the GNU 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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* Following clarification and special exception to the GNU General Public
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* License is included to the distribution terms of CANopenNode:
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*
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* Linking this library statically or dynamically with other modules is
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* making a combined work based on this library. Thus, the terms and
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* conditions of the GNU General Public License cover the whole combination.
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*
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* As a special exception, the copyright holders of this library give
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* you permission to link this library with independent modules to
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* produce an executable, regardless of the license terms of these
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* independent modules, and to copy and distribute the resulting
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* executable under terms of your choice, provided that you also meet,
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* for each linked independent module, the terms and conditions of the
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* license of that module. An independent module is a module which is
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* not derived from or based on this library. If you modify this
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* library, you may extend this exception to your version of the
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* library, but you are not obliged to do so. If you do not wish
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* to do so, delete this exception statement from your version.
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*/
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#ifndef CRC16_CCITT_H
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#define CRC16_CCITT_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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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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#ifdef CO_USE_OWN_CRC16
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extern
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#endif
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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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#ifdef __cplusplus
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}
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#endif /*__cplusplus*/
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/** @} */
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#endif
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