Momentum-Apps/esubghz_chat/lib/nfclegacy/ST25RFAL002/include/rfal_crc.h

/******************************************************************************
  * \attention
  *
  * <h2><center>&copy; COPYRIGHT 2020 STMicroelectronics</center></h2>
  *
  * Licensed under ST MYLIBERTY SOFTWARE LICENSE AGREEMENT (the "License");
  * You may not use this file except in compliance with the License.
  * You may obtain a copy of the License at:
  *
  *        www.st.com/myliberty
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  * distributed under the License is distributed on an "AS IS" BASIS, 
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  * See the License for the specific language governing permissions and
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******************************************************************************/

/*
 *      PROJECT:   ST25R391x firmware
 *      Revision:
 *      LANGUAGE:  ISO C99
 */

/*! \file rfal_crc.h
 *
 *  \author Ulrich Herrmann
 *
 *  \brief CRC calculation module
 *
 */
/*!
 * 
 */

#ifndef RFAL_CRC_H_
#define RFAL_CRC_H_

/*
******************************************************************************
* INCLUDES
******************************************************************************
*/
#include "../platform.h"

/*
******************************************************************************
* GLOBAL FUNCTION PROTOTYPES
******************************************************************************
*/
/*! 
 *****************************************************************************
 *  \brief  Calculate CRC according to CCITT standard.
 *
 *  This function takes \a length bytes from \a buf and calculates the CRC
 *  for this data. The result is returned.
 *  \note This implementation calculates the CRC with LSB first, i.e. all
 *  bytes are "read" from right to left.
 *
 *  \param[in] preloadValue : Initial value of CRC calculation.
 *  \param[in] buf : buffer to calculate the CRC for.
 *  \param[in] length : size of the buffer.
 *
 *  \return 16 bit long crc value.
 *
 *****************************************************************************
 */
extern uint16_t rfalCrcCalculateCcitt(uint16_t preloadValue, const uint8_t* buf, uint16_t length);

#endif /* RFAL_CRC_H_ */