/* ----------------------------------------------------------------------------
 *         ATMEL Microcontroller Software Support
 * ----------------------------------------------------------------------------
 * Copyright (c) 2008, Atmel Corporation
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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

