96 lines
3.6 KiB
C
96 lines
3.6 KiB
C
/**
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* Copyright (c) 2016 - 2020 Nordic Semiconductor ASA and Luxoft Global Operations Gmbh.
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*
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* All Rights Reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form, except as embedded into a Nordic
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* Semiconductor ASA integrated circuit in a product or a software update for
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* such product, must reproduce the above copyright notice, this list of
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* conditions and the following disclaimer in the documentation and/or other
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* materials provided with the distribution.
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*
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* 3. Neither the name of Nordic Semiconductor ASA nor the names of its
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* contributors may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* 4. This software, with or without modification, must only be used with a
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* Nordic Semiconductor ASA integrated circuit.
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*
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* 5. Any software provided in binary form under this license must not be reverse
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* engineered, decompiled, modified and/or disassembled.
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*
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*
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* THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#ifndef SYS_CRC_H_INCLUDED
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#define SYS_CRC_H_INCLUDED
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#include <stdint.h>
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#include <stddef.h>
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/** @file
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* This file contains declarations of the CRC computing routines and necessary macros/types.
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*
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* @defgroup sys_crc System CRC API
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* @ingroup sys_15_4
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* @{
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* @brief Module to declare System CRC API.
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* @details The CRC module implements a set of routines to compute the 16-bit CRC value for octet arrays.
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*/
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/**
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* @brief Defines an initial value for the CRC sum.
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*/
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#define SYS_CRC_INIT 0
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/**
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* @brief CRC value type. This module uses 16-bit CRC.
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*/
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typedef uint16_t sys_crc_t;
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/**
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* @brief Function for computing CRC value for given data.
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*
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* @param[in] p_data Pointer to data to compute.
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* @param[in] length Length of data.
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*
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* @return Returns the CRC value for input data.
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*/
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sys_crc_t sys_crc_calc(const uint8_t * p_data, size_t length);
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/**
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* @brief Function for updating the CRC value taking into the account the previously counted value.
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*
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* @details This function is used when input data is represented by several pieces.
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* Consequently, a call to this function for each piece will give a correct
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* total CRC value.
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*
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* @param[in] current_crc Previously counted CRC value. Should be SYS_CRC_INIT for the first piece.
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* @param[in] p_data Pointer to the current piece of data.
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* @param[in] length Length of the current piece of data.
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*
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* @return Returns the updated CRC value.
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*/
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sys_crc_t sys_crc_continue(sys_crc_t current_crc, const uint8_t * p_data, size_t length);
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/** @} */
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#endif /* SYS_CRC_H_INCLUDED */
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