| /* ---------------------------------------------------------------------------- | |
| * 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 | |
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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 | |