81 lines
2.2 KiB
C
81 lines
2.2 KiB
C
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/**
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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 - 2020 Janez Paternoster
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*
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* This file is part of <https://github.com/CANopenNode/CANopenNode>, a CANopen Stack.
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this
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* file except in compliance with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software distributed under the License is
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* distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and limitations under the License.
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*/
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#ifndef CRC16_CCITT_H
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#define CRC16_CCITT_H
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#include "301/CO_driver.h"
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/* default configuration, see CO_config.h */
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#ifndef CO_CONFIG_CRC16
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#define CO_CONFIG_CRC16 (0)
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#endif
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#if (((CO_CONFIG_CRC16)&CO_CONFIG_CRC16_ENABLE) != 0) || defined CO_DOXYGEN
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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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* Calculation of CRC 16 CCITT polynomial.
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*
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* @ingroup CO_CANopen_301
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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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* Update crc16_ccitt variable with one data byte
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*
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* This function updates crc variable for one data byte using crc16 ccitt algorithm.
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*
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* @param [in,out] crc Externally defined variable for CRC checksum. Before start of new CRC calculation, variable must
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* be initialized (zero for xmodem).
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* @param chr One byte of data
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*/
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void crc16_ccitt_single(uint16_t* crc, const uint8_t chr);
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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 multiple segments, previous CRC is used as
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* initial.
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*
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* @return Calculated CRC.
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*/
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uint16_t crc16_ccitt(const uint8_t block[], size_t blockLength, uint16_t crc);
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/** @} */ /* CO_crc16_ccitt */
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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#endif /* (CO_CONFIG_CRC16) & CO_CONFIG_CRC16_ENABLE */
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#endif /* CRC16_CCITT_H */
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