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/* ----------------------------------------------------------------------------
 *         ATMEL Microcontroller Software Support 
 * ----------------------------------------------------------------------------
 * Copyright (c) 2008, 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
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 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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 * ----------------------------------------------------------------------------
 */
 
//------------------------------------------------------------------------------
/// \unit
///
/// !!!Purpose
/// 
/// Configuration and handling of interrupts on PIO status changes. The API
/// provided here have several advantages over the traditional PIO interrupt
/// configuration approach:
///    - It is highly portable
///    - It automatically demultiplexes interrupts when multiples pins have been
///      configured on a single PIO controller
///    - It allows a group of pins to share the same interrupt
/// 
/// However, it also has several minor drawbacks that may prevent from using it
/// in particular applications:
///    - It enables the clocks of all PIO controllers
///    - PIO controllers all share the same interrupt handler, which does the
///      demultiplexing and can be slower than direct configuration
///    - It reserves space for a fixed number of interrupts, which can be
///      increased by modifying the appropriate constant in pio_it.c.
///
/// !!!Usage
/// 
/// -# Initialize the PIO interrupt mechanism using PIO_InitializeInterrupts()
///    with the desired priority (0 ... 7).
/// -# Configure a status change interrupt on one or more pin(s) with
///    PIO_ConfigureIt().
/// -# Enable & disable interrupts on pins using PIO_EnableIt() and
///    PIO_DisableIt().
//------------------------------------------------------------------------------
 
#ifndef PIO_IT_H
#define PIO_IT_H
 
//------------------------------------------------------------------------------
//         Headers
//------------------------------------------------------------------------------
 
#include "pio.h"
 
//------------------------------------------------------------------------------
//         Global functions
//------------------------------------------------------------------------------
 
extern void PIO_InitializeInterrupts(unsigned int priority);
 
extern void PIO_ConfigureIt(const Pin *pPin, void (*handler)(const Pin *));
 
extern void PIO_EnableIt(const Pin *pPin);
 
extern void PIO_DisableIt(const Pin *pPin);
 
extern void PIO_IT_InterruptHandler(void);
 
#endif //#ifndef PIO_IT_H