[e1eeb883] | 1 | /* ---------------------------------------------------------------------------- */ |
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| 2 | /* Atmel Microcontroller Software Support */ |
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| 3 | /* SAM Software Package License */ |
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| 4 | /* ---------------------------------------------------------------------------- */ |
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| 5 | /* Copyright (c) 2015, Atmel Corporation */ |
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| 6 | /* */ |
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| 7 | /* All rights reserved. */ |
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| 8 | /* */ |
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| 9 | /* Redistribution and use in source and binary forms, with or without */ |
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| 10 | /* modification, are permitted provided that the following condition is met: */ |
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| 11 | /* */ |
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| 12 | /* - Redistributions of source code must retain the above copyright notice, */ |
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| 13 | /* this list of conditions and the disclaimer below. */ |
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| 14 | /* */ |
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| 15 | /* Atmel's name may not be used to endorse or promote products derived from */ |
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| 16 | /* this software without specific prior written permission. */ |
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| 17 | /* */ |
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| 18 | /* DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR */ |
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| 19 | /* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF */ |
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| 20 | /* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE */ |
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| 21 | /* DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT, */ |
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| 22 | /* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT */ |
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| 23 | /* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, */ |
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| 24 | /* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF */ |
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| 25 | /* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING */ |
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| 26 | /* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, */ |
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| 27 | /* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ |
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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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[a4936b5] | 80 | extern void PIO_ConfigureIt(const Pin *pPin, |
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| 81 | void (*handler)(const Pin *, void *arg), void *arg); |
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[e1eeb883] | 82 | |
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| 83 | |
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[a4936b5] | 84 | /** |
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| 85 | * Enables the given interrupt source if it has been configured. The status |
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| 86 | * register of the corresponding PIO controller is cleared prior to enabling |
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| 87 | * the interrupt. |
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| 88 | * \param pPin Interrupt source to enable. |
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| 89 | */ |
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| 90 | static inline void PIO_EnableIt(const Pin *pPin) |
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| 91 | { |
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| 92 | pPin->pio->PIO_ISR; |
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| 93 | pPin->pio->PIO_IER = pPin->mask; |
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| 94 | } |
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| 95 | |
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| 96 | /** |
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| 97 | * Disables a given interrupt source, with no added side effects. |
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| 98 | * |
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| 99 | * \param pPin Interrupt source to disable. |
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| 100 | */ |
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| 101 | static inline void PIO_DisableIt(const Pin *pPin) |
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| 102 | { |
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| 103 | pPin->pio->PIO_IDR = pPin->mask; |
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| 104 | } |
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[e1eeb883] | 105 | |
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| 106 | extern void PIO_IT_InterruptHandler(void); |
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| 107 | |
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| 108 | extern void PioInterruptHandler(uint32_t id, Pio *pPio); |
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| 109 | |
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| 110 | extern void PIO_CaptureHandler(void); |
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| 111 | |
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| 112 | #ifdef __cplusplus |
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| 113 | } |
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| 114 | #endif |
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| 115 | |
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| 116 | #endif /* #ifndef _PIO_IT_ */ |
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| 117 | |
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