| 1 |
580 |
jeremybenn |
/* ----------------------------------------------------------------------------
|
| 2 |
|
|
* ATMEL Microcontroller Software Support
|
| 3 |
|
|
* ----------------------------------------------------------------------------
|
| 4 |
|
|
* Copyright (c) 2008, Atmel Corporation
|
| 5 |
|
|
*
|
| 6 |
|
|
* All rights reserved.
|
| 7 |
|
|
*
|
| 8 |
|
|
* Redistribution and use in source and binary forms, with or without
|
| 9 |
|
|
* modification, are permitted provided that the following conditions are met:
|
| 10 |
|
|
*
|
| 11 |
|
|
* - Redistributions of source code must retain the above copyright notice,
|
| 12 |
|
|
* this list of conditions and the disclaimer below.
|
| 13 |
|
|
*
|
| 14 |
|
|
* Atmel's name may not be used to endorse or promote products derived from
|
| 15 |
|
|
* this software without specific prior written permission.
|
| 16 |
|
|
*
|
| 17 |
|
|
* DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
|
| 18 |
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
| 19 |
|
|
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
|
| 20 |
|
|
* DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
|
| 21 |
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
| 22 |
|
|
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
|
| 23 |
|
|
* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
|
| 24 |
|
|
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
|
| 25 |
|
|
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
|
| 26 |
|
|
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
| 27 |
|
|
* ----------------------------------------------------------------------------
|
| 28 |
|
|
*/
|
| 29 |
|
|
|
| 30 |
|
|
//------------------------------------------------------------------------------
|
| 31 |
|
|
/// \unit
|
| 32 |
|
|
///
|
| 33 |
|
|
/// !!!Purpose
|
| 34 |
|
|
///
|
| 35 |
|
|
/// Configuration and handling of interrupts on PIO status changes. The API
|
| 36 |
|
|
/// provided here have several advantages over the traditional PIO interrupt
|
| 37 |
|
|
/// configuration approach:
|
| 38 |
|
|
/// - It is highly portable
|
| 39 |
|
|
/// - It automatically demultiplexes interrupts when multiples pins have been
|
| 40 |
|
|
/// configured on a single PIO controller
|
| 41 |
|
|
/// - It allows a group of pins to share the same interrupt
|
| 42 |
|
|
///
|
| 43 |
|
|
/// However, it also has several minor drawbacks that may prevent from using it
|
| 44 |
|
|
/// in particular applications:
|
| 45 |
|
|
/// - It enables the clocks of all PIO controllers
|
| 46 |
|
|
/// - PIO controllers all share the same interrupt handler, which does the
|
| 47 |
|
|
/// demultiplexing and can be slower than direct configuration
|
| 48 |
|
|
/// - It reserves space for a fixed number of interrupts, which can be
|
| 49 |
|
|
/// increased by modifying the appropriate constant in pio_it.c.
|
| 50 |
|
|
///
|
| 51 |
|
|
/// !!!Usage
|
| 52 |
|
|
///
|
| 53 |
|
|
/// -# Initialize the PIO interrupt mechanism using PIO_InitializeInterrupts()
|
| 54 |
|
|
/// with the desired priority (0 ... 7).
|
| 55 |
|
|
/// -# Configure a status change interrupt on one or more pin(s) with
|
| 56 |
|
|
/// PIO_ConfigureIt().
|
| 57 |
|
|
/// -# Enable & disable interrupts on pins using PIO_EnableIt() and
|
| 58 |
|
|
/// PIO_DisableIt().
|
| 59 |
|
|
//------------------------------------------------------------------------------
|
| 60 |
|
|
|
| 61 |
|
|
#ifndef PIO_IT_H
|
| 62 |
|
|
#define PIO_IT_H
|
| 63 |
|
|
|
| 64 |
|
|
//------------------------------------------------------------------------------
|
| 65 |
|
|
// Headers
|
| 66 |
|
|
//------------------------------------------------------------------------------
|
| 67 |
|
|
|
| 68 |
|
|
#include "pio.h"
|
| 69 |
|
|
|
| 70 |
|
|
//------------------------------------------------------------------------------
|
| 71 |
|
|
// Global functions
|
| 72 |
|
|
//------------------------------------------------------------------------------
|
| 73 |
|
|
|
| 74 |
|
|
extern void PIO_InitializeInterrupts(unsigned int priority);
|
| 75 |
|
|
|
| 76 |
|
|
extern void PIO_ConfigureIt(const Pin *pPin, void (*handler)(const Pin *));
|
| 77 |
|
|
|
| 78 |
|
|
extern void PIO_EnableIt(const Pin *pPin);
|
| 79 |
|
|
|
| 80 |
|
|
extern void PIO_DisableIt(const Pin *pPin);
|
| 81 |
|
|
|
| 82 |
|
|
extern void PIO_IT_InterruptHandler(void);
|
| 83 |
|
|
|
| 84 |
|
|
#endif //#ifndef PIO_IT_H
|
| 85 |
|
|
|
