/* ----------------------------------------------------------------------------
 *         ATMEL Microcontroller Software Support
 * ----------------------------------------------------------------------------
 * Copyright (c) 2009, Atmel Corporation
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the disclaimer below.
 *
 * Atmel's name may not be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
 * DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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 * ----------------------------------------------------------------------------
 */
 
 /**
 * \file
 *
 * Provide a routine for asynchronos transfer.
 *
 */

#ifndef ASYNC_H
#define ASYNC_H


/*----------------------------------------------------------------------------
 *        Definition
 *----------------------------------------------------------------------------*/
/** Transfer is still pending.*/
#define ASYNC_STATUS_PENDING        0xFF

/*----------------------------------------------------------------------------
 *        Type
 *----------------------------------------------------------------------------*/
/** Asynchronous transfer descriptor. */
typedef struct _Async {

    /** Asynchronous transfer status.*/
    volatile uint8_t status;
    /** Callback function to invoke when transfer completes or fails.*/
    void *callback;
    /** Driver storage area; do not use.*/
    uint32_t pStorage[4];
} Async;

/*----------------------------------------------------------------------------
 *        Global functions
 *----------------------------------------------------------------------------*/
extern uint8_t ASYNC_IsFinished(Async *pAsync);

#endif //#ifndef ASYNC_H