SAMV71 Xplained Ultra Software Package 1.4

MSDIOFifo.c

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00001 /* ----------------------------------------------------------------------------
00002  *         ATMEL Microcontroller Software Support 
00003  * ----------------------------------------------------------------------------
00004  * Copyright (c) 2008, Atmel Corporation
00005  *
00006  * All rights reserved.
00007  *
00008  * Redistribution and use in source and binary forms, with or without
00009  * modification, are permitted provided that the following conditions are met:
00010  *
00011  * - Redistributions of source code must retain the above copyright notice,
00012  * this list of conditions and the disclaimer below.
00013  *
00014  * Atmel's name may not be used to endorse or promote products derived from
00015  * this software without specific prior written permission.
00016  *
00017  * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
00018  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
00019  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
00020  * DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
00021  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
00022  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
00023  * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
00024  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
00025  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
00026  * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00027  * ----------------------------------------------------------------------------
00028  */
00029 
00030 /** \file
00031  * \addtogroup usbd_msd
00032  *@{
00033  */
00034 
00035 /*------------------------------------------------------------------------------
00036  *         Headers
00037  *------------------------------------------------------------------------------*/
00038 
00039 #include "MSDIOFifo.h"
00040 
00041 /*------------------------------------------------------------------------------
00042  *         Internal variables
00043  *------------------------------------------------------------------------------*/
00044 
00045 
00046 /*------------------------------------------------------------------------------
00047  *         Exported functions
00048  *------------------------------------------------------------------------------*/
00049 
00050 /**
00051  * \brief  Initializes a MSDIOFifo instance.
00052  * \param  pFifo        Pointer to the MSDIOFifo instance to initialize
00053  * \param  pBuffer      Pointer to a buffer used for read/write operation and
00054  *                      which must be blockSize bytes aligned.
00055  * \param  bufferSize   Total size of the buffer in bytes
00056  */
00057 void MSDIOFifo_Init(MSDIOFifo *pFifo,
00058                     void * pBuffer, unsigned int bufferSize)
00059 {
00060     pFifo->pBuffer = pBuffer;
00061     pFifo->bufferSize = bufferSize;
00062 
00063     pFifo->inputNdx = 0;
00064     pFifo->outputNdx = 0;
00065     pFifo->inputTotal = 0;
00066     pFifo->outputTotal = 0;
00067 
00068     pFifo->inputState = MSDIO_IDLE;
00069     pFifo->outputState = MSDIO_IDLE;
00070 
00071     pFifo->fullCnt = 0;
00072     pFifo->nullCnt = 0;
00073 }
00074 
00075 /**@}*/
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