owner-nrf52sdk/nRF5_SDK_15.2.0/components/libraries/crc16/crc16.h

/**
 * Copyright (c) 2013 - 2018, Nordic Semiconductor ASA
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 *    Semiconductor ASA integrated circuit in a product or a software update for
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/** @file
 *
 * @defgroup crc16 CRC16 compute
 * @{
 * @ingroup hci_transport
 *
 * @brief    This module implements CRC-16-CCITT (polynomial 0x1021) with 0xFFFF initial value.
 *           The data can be passed in multiple blocks.
 */

#ifndef CRC16_H__
#define CRC16_H__

#include <stdint.h>

#ifdef __cplusplus
extern "C" {
#endif

/**@brief Function for calculating CRC-16 in blocks.
 *
 * Feed each consecutive data block into this function, along with the current value of p_crc as
 * returned by the previous call of this function. The first call of this function should pass NULL
 * as the initial value of the crc in p_crc.
 *
 * @param[in] p_data The input data block for computation.
 * @param[in] size   The size of the input data block in bytes.
 * @param[in] p_crc  The previous calculated CRC-16 value or NULL if first call.
 *
 * @return The updated CRC-16 value, based on the input supplied.
 */
uint16_t crc16_compute(uint8_t const * p_data, uint32_t size, uint16_t const * p_crc);

#ifdef __cplusplus
}
#endif

#endif // CRC16_H__

/** @} */