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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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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82 | |
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83 | |
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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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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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