Christina Quast | 637ace9 | 2014-11-28 13:28:37 +0100 | [diff] [blame] | 1 | /* ----------------------------------------------------------------------------
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| 2 | * ATMEL Microcontroller Software Support
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| 3 | * ----------------------------------------------------------------------------
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| 4 | * Copyright (c) 2008, Atmel Corporation
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| 5 | *
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| 6 | * All rights reserved.
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| 7 | *
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| 8 | * Redistribution and use in source and binary forms, with or without
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| 9 | * modification, are permitted provided that the following conditions are met:
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| 10 | *
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| 11 | * - Redistributions of source code must retain the above copyright notice,
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| 12 | * this list of conditions and the disclaimer below.
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| 13 | *
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| 14 | * Atmel's name may not be used to endorse or promote products derived from
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| 15 | * this software without specific prior written permission.
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| 16 | *
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| 17 | * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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| 19 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
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| 20 | * DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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| 22 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
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| 23 | * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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| 24 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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| 25 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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| 26 | * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | * ----------------------------------------------------------------------------
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| 28 | */
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| 29 |
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| 30 | /**
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| 31 | * \file
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| 32 | *
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| 33 | * \par Purpose
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| 34 | *
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| 35 | * Configuration and handling of interrupts on PIO status changes. The API
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| 36 | * provided here have several advantages over the traditional PIO interrupt
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| 37 | * configuration approach:
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| 38 | * - It is highly portable
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| 39 | * - It automatically demultiplexes interrupts when multiples pins have been
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| 40 | * configured on a single PIO controller
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| 41 | * - It allows a group of pins to share the same interrupt
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| 42 | *
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| 43 | * However, it also has several minor drawbacks that may prevent from using it
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| 44 | * in particular applications:
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| 45 | * - It enables the clocks of all PIO controllers
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| 46 | * - PIO controllers all share the same interrupt handler, which does the
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| 47 | * demultiplexing and can be slower than direct configuration
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| 48 | * - It reserves space for a fixed number of interrupts, which can be
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| 49 | * increased by modifying the appropriate constant in pio_it.c.
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| 50 | *
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| 51 | * \par Usage
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| 52 | *
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| 53 | * -# Initialize the PIO interrupt mechanism using PIO_InitializeInterrupts()
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| 54 | * with the desired priority (0 ... 7).
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| 55 | * -# Configure a status change interrupt on one or more pin(s) with
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| 56 | * PIO_ConfigureIt().
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| 57 | * -# Enable & disable interrupts on pins using PIO_EnableIt() and
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| 58 | * PIO_DisableIt().
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| 59 | */
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| 60 |
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| 61 | #ifndef _PIO_IT_
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| 62 | #define _PIO_IT_
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| 63 |
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| 64 | /*
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| 65 | * Headers
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| 66 | */
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| 67 |
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| 68 | #include "pio.h"
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| 69 |
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| 70 | #ifdef __cplusplus
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| 71 | extern "C" {
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| 72 | #endif
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| 73 |
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| 74 | /*
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| 75 | * Global functions
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| 76 | */
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| 77 |
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| 78 | extern void PIO_InitializeInterrupts( uint32_t dwPriority ) ;
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| 79 |
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| 80 | extern void PIO_ConfigureIt( const Pin *pPin, void (*handler)( const Pin* ) ) ;
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| 81 |
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| 82 | extern void PIO_EnableIt( const Pin *pPin ) ;
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| 83 |
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| 84 | extern void PIO_DisableIt( const Pin *pPin ) ;
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| 85 |
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| 86 | extern void PIO_IT_InterruptHandler( void ) ;
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| 87 |
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| 88 | extern void PioInterruptHandler( uint32_t id, Pio *pPio ) ;
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| 89 |
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| 90 | extern void PIO_CaptureHandler( void ) ;
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| 91 |
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| 92 | #ifdef __cplusplus
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| 93 | }
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| 94 | #endif
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| 95 |
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| 96 | #endif /* #ifndef _PIO_IT_ */
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| 97 |
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