45 lines
1.4 KiB
C
45 lines
1.4 KiB
C
/* Copyright (c) 2013 Nordic Semiconductor. All Rights Reserved.
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*
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* The information contained herein is property of Nordic Semiconductor ASA.
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* Terms and conditions of usage are described in detail in NORDIC
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* SEMICONDUCTOR STANDARD SOFTWARE LICENSE AGREEMENT.
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*
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* Licensees are granted free, non-transferable use of the information. NO
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* WARRANTY of ANY KIND is provided. This heading must NOT be removed from
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* the file.
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*
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*/
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/** @file
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*
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* @defgroup crc_compute CRC compute
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* @{
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* @ingroup hci_transport
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*
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* @brief This module implements CRC-16-CCITT (polynomial 0x1021) with 0xFFFF initial value.
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* The data can be passed in multiple blocks.
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*/
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#ifndef CRC16_H__
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#define CRC16_H__
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#include <stdint.h>
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/**@brief Function for calculating CRC-16 in blocks.
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*
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* Feed each consecutive data block into this function, along with the current value of p_crc as
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* returned by the previous call of this function. The first call of this function should pass NULL
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* as the initial value of the crc in p_crc.
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*
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* @param[in] p_data The input data block for computation.
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* @param[in] size The size of the input data block in bytes.
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* @param[in] p_crc The previous calculated CRC-16 value or NULL if first call.
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*
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* @return The updated CRC-16 value, based on the input supplied.
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*/
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uint16_t crc16_compute(uint8_t const * p_data, uint32_t size, uint16_t const * p_crc);
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#endif // CRC16_H__
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/** @} */
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