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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
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
* ----------------------------------------------------------------------------
*/
//------------------------------------------------------------------------------
/// \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);
#endif //#ifndef PIO_IT_H
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