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/*******************************************************************************
 * Copyright (C) 2016 Maxim Integrated Products, Inc., All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
 * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Except as contained in this notice, the name of Maxim Integrated
 * Products, Inc. shall not be used except as stated in the Maxim Integrated
 * Products, Inc. Branding Policy.
 *
 * The mere transfer of this software does not imply any licenses
 * of trade secrets, proprietary technology, copyrights, patents,
 * trademarks, maskwork rights, or any other form of intellectual
 * property whatsoever. Maxim Integrated Products, Inc. retains all
 * ownership rights.
 *
 ********************************************************************************
 */
#ifndef _RPCFIFO_H_
#define _RPCFIFO_H_

#include <stdint.h>

/// Structure used for FIFO management
typedef struct {
  unsigned int length; ///< FIFO size (number of elements)
  void *data;          ///< pointer to the FIFO buffer
  unsigned int rindex; ///< current FIFO read index
  unsigned int windex; ///< current FIFO write index
} fifo_t;

/**
* @param    fifo     FIFO on which to perform the operation
* @param    mem      memory buffer to use for FIFO element storage
* @param    length   number of elements that the memory buffer can contain
* @returns  0 if successful, -1 upon failure
*/
void fifo_init(fifo_t *fifo, void *mem, unsigned int length);

/**
* @brief    Adds and 8-bit element to the FIFO
* @param    fifo     FIFO on which to perform the operation
* @param    element  element to add to the FIFO
* @returns  0 if successful, -1 upon failure
*/
int fifo_put8(fifo_t *fifo, uint8_t element);

/**
* @brief    Gets the next 8-bit element to the FIFO
* @param    fifo     FIFO on which to perform the operation
* @param    element  pointer to where to store the element from the FIFO
* @returns  0 if successful, -1 upon failure
*/
int fifo_get8(fifo_t *fifo, uint8_t *element);

/**
* @brief    Adds the next 16-bit element to the FIFO
* @param    fifo     FIFO on which to perform the operation
* @param    element  element to add to the FIFO
* @returns  0 if successful, -1 upon failure
*/
int fifo_put16(fifo_t *fifo, uint16_t element);

/**
* @brief    Gets the next 16-bit element to the FIFO
* @param    fifo     FIFO on which to perform the operation
* @param    element  pointer to where to store the element from the FIFO
* @returns  0 if successful, -1 upon failure
*/
int fifo_get16(fifo_t *fifo, uint16_t *element);

/**
* @brief    Adds the next 16-bit element to the FIFO
* @param    fifo     FIFO on which to perform the operation
* @param    element  element to add to the FIFO
* @returns  0 if successful, -1 upon failure
*/
int fifo_put32(fifo_t *fifo, uint32_t element);

/**
* @brief    Gets the next 16-bit element to the FIFO
* @param    fifo     FIFO on which to perform the operation
* @param    element  pointer to where to store the element from the FIFO
* @returns  0 if successful, -1 upon failure
*/
int fifo_get32(fifo_t *fifo, uint32_t *element);

/**
* @brief    Immediately resets the FIFO to the empty state
* @param    fifo   FIFO on which to perform the operation
*/
void fifo_clear(fifo_t *fifo);

/**
* @brief    Determines if the FIFO is empty
* @param    fifo   FIFO on which to perform the operation
* @returns  #TRUE if FIFO is empty, #FALSE otherwise
*/
int fifo_empty(fifo_t *fifo);

/**
* @brief    FIFO status function
* @param    fifo   FIFO on which to perform the operation
* @returns  #TRUE if FIFO is full, #FALSE otherwise
*/
int fifo_full(fifo_t *fifo);

/**
* @brief    FIFO status function
* @param    fifo   FIFO on which to perform the operation
* @returns  the number of elements currently in the FIFO
*/
unsigned int fifo_level(fifo_t *fifo);

/**
* @brief    FIFO status function
* @param    fifo   FIFO on which to perform the operation
* @returns  the remaining elements that can be added to the FIFO
*/
unsigned int fifo_remaining(fifo_t *fifo);

#endif // _RPCFIFO_H_