[136] | 1 | /*
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| 2 | Copyright (c) 2014 Arduino. All right reserved.
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| 3 |
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| 4 | This library is free software; you can redistribute it and/or
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| 5 | modify it under the terms of the GNU Lesser General Public
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| 6 | License as published by the Free Software Foundation; either
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| 7 | version 2.1 of the License, or (at your option) any later version.
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| 8 |
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| 9 | This library is distributed in the hope that it will be useful,
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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| 12 | See the GNU Lesser General Public License for more details.
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| 13 |
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| 14 | You should have received a copy of the GNU Lesser General Public
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| 15 | License along with this library; if not, write to the Free Software
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| 16 | Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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| 17 | */
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| 18 |
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| 19 | #include "WInterrupts.h"
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| 20 | #include "variant.h"
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| 21 | #include "wiring_digital.h"
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| 22 |
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| 23 | #include <string.h>
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| 24 |
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| 25 | #ifdef __cplusplus
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| 26 | extern "C" {
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| 27 | #endif
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| 28 |
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| 29 | static struct
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| 30 | {
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| 31 | uint32_t _ulPin ;
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| 32 | voidFuncPtr _callback ;
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| 33 | } callbacksInt[EXTERNAL_NUM_INTERRUPTS] ;
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| 34 |
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| 35 | /* Configure I/O interrupt sources */
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| 36 | static void __initialize()
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| 37 | {
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| 38 | #if 0
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| 39 | int i ;
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| 40 |
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| 41 | for ( i = 0 ; i < EXTERNAL_NUM_INTERRUPTS ; i++ )
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| 42 | {
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| 43 | callbacksInt[i]._callback = NULL ;
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| 44 | }
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| 45 | #else
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| 46 | memset( callbacksInt, 0, sizeof( callbacksInt ) ) ;
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| 47 | #endif
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| 48 |
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| 49 | NVIC_DisableIRQ( EIC_IRQn ) ;
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| 50 | NVIC_ClearPendingIRQ( EIC_IRQn ) ;
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| 51 | NVIC_SetPriority( EIC_IRQn, 0 ) ;
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| 52 | NVIC_EnableIRQ( EIC_IRQn ) ;
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| 53 |
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| 54 |
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| 55 |
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| 56 | // Enable GCLK for IEC (External Interrupt Controller)
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| 57 | GCLK->CLKCTRL.reg = (uint16_t) (GCLK_CLKCTRL_CLKEN | GCLK_CLKCTRL_GEN_GCLK0 | GCLK_CLKCTRL_ID( GCM_EIC )) ;
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| 58 |
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| 59 | // Enable EIC
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| 60 | EIC->CTRL.bit.ENABLE = 1 ;
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| 61 |
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| 62 | while ( EIC->STATUS.bit.SYNCBUSY == 1 )
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| 63 | {
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| 64 | // Waiting for synchronisation
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| 65 | }
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| 66 |
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| 67 | }
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| 68 |
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| 69 | /*
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| 70 | * \brief Specifies a named Interrupt Service Routine (ISR) to call when an interrupt occurs.
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| 71 | * Replaces any previous function that was attached to the interrupt.
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| 72 | */
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| 73 |
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| 74 | void attachInterrupt( uint32_t ulPin, voidFuncPtr callback, uint32_t ulMode )
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| 75 | {
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| 76 | static int enabled = 0 ;
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| 77 | uint32_t ulConfig ;
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| 78 | uint32_t ulPos ;
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| 79 |
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| 80 | if ( digitalPinToInterrupt( ulPin ) == NOT_AN_INTERRUPT )
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| 81 | {
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| 82 | return ;
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| 83 | }
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| 84 |
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| 85 | if ( !enabled )
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| 86 | {
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| 87 | __initialize() ;
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| 88 | enabled = 1 ;
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| 89 | }
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| 90 |
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| 91 | // Assign pin to EIC
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| 92 | pinPeripheral( ulPin, PIO_EXTINT ) ;
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| 93 |
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| 94 | // Assign callback to interrupt
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| 95 | callbacksInt[digitalPinToInterrupt( ulPin )]._ulPin = ulPin ;
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| 96 | callbacksInt[digitalPinToInterrupt( ulPin )]._callback = callback ;
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| 97 |
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| 98 | // Check if normal interrupt or NMI
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| 99 | if ( ulPin != 2 )
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| 100 | {
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| 101 | // Look for right CONFIG register to be addressed
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| 102 | if ( digitalPinToInterrupt( ulPin ) > EXTERNAL_INT_7 )
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| 103 | {
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| 104 | ulConfig = 1 ;
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| 105 | }
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| 106 | else
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| 107 | {
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| 108 | ulConfig = 0 ;
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| 109 | }
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| 110 |
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| 111 | // Configure the interrupt mode
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| 112 | ulPos = ((digitalPinToInterrupt( ulPin ) - (8*ulConfig) ) << 2) ;
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| 113 | switch ( ulMode )
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| 114 | {
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| 115 | case LOW:
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| 116 | EIC->CONFIG[ulConfig].reg |= EIC_CONFIG_SENSE0_LOW_Val << ulPos ;
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| 117 | break ;
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| 118 |
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| 119 | case HIGH:
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| 120 | EIC->CONFIG[ulConfig].reg |= EIC_CONFIG_SENSE0_HIGH_Val << ulPos ;
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| 121 | break ;
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| 122 |
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| 123 | case CHANGE:
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| 124 | EIC->CONFIG[ulConfig].reg |= EIC_CONFIG_SENSE0_BOTH_Val << ulPos ;
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| 125 | break ;
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| 126 |
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| 127 | case FALLING:
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| 128 | EIC->CONFIG[ulConfig].reg |= EIC_CONFIG_SENSE0_FALL_Val << ulPos ;
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| 129 | break ;
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| 130 |
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| 131 | case RISING:
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| 132 | EIC->CONFIG[ulConfig].reg |= EIC_CONFIG_SENSE0_RISE_Val << ulPos ;
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| 133 | break ;
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| 134 | }
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| 135 |
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| 136 | // Enable the interrupt
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| 137 | EIC->INTENSET.reg = EIC_INTENSET_EXTINT( 1 << digitalPinToInterrupt( ulPin ) ) ;
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| 138 | }
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| 139 | else // Handles NMI on pin 2
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| 140 | {
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| 141 | // Configure the interrupt mode
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| 142 | switch ( ulMode )
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| 143 | {
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| 144 | case LOW:
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| 145 | EIC->NMICTRL.reg = EIC_NMICTRL_NMISENSE_LOW ;
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| 146 | break ;
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| 147 |
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| 148 | case HIGH:
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| 149 | EIC->NMICTRL.reg = EIC_NMICTRL_NMISENSE_HIGH ;
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| 150 | break ;
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| 151 |
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| 152 | case CHANGE:
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| 153 | EIC->NMICTRL.reg = EIC_NMICTRL_NMISENSE_BOTH ;
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| 154 | break ;
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| 155 |
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| 156 | case FALLING:
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| 157 | EIC->NMICTRL.reg = EIC_NMICTRL_NMISENSE_FALL ;
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| 158 | break ;
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| 159 |
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| 160 | case RISING:
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| 161 | EIC->NMICTRL.reg= EIC_NMICTRL_NMISENSE_RISE ;
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| 162 | break ;
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| 163 | }
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| 164 |
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| 165 | // Enable the interrupt
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| 166 | EIC->INTENSET.reg = EIC_INTENSET_EXTINT( 1 << digitalPinToInterrupt( ulPin ) ) ;
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| 167 | }
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| 168 | }
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| 169 |
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| 170 | /*
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| 171 | * \brief Turns off the given interrupt.
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| 172 | */
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| 173 | void detachInterrupt( uint32_t ulPin )
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| 174 | {
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| 175 | /*
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| 176 | // Retrieve pin information
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| 177 | Pio *pio = g_APinDescription[pin].pPort;
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| 178 | uint32_t mask = g_APinDescription[pin].ulPin;
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| 179 |
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| 180 | // Disable interrupt
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| 181 | pio->PIO_IDR = mask;
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| 182 | */
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| 183 | if ( digitalPinToInterrupt( ulPin ) == NOT_AN_INTERRUPT )
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| 184 | {
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| 185 | return ;
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| 186 | }
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| 187 |
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| 188 | EIC->INTENCLR.reg = EIC_INTENCLR_EXTINT( 1 << digitalPinToInterrupt( ulPin ) ) ;
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| 189 | }
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| 190 |
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| 191 | /*
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| 192 | * External Interrupt Controller NVIC Interrupt Handler
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| 193 | */
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| 194 | void EIC_Handler( void )
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| 195 | {
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| 196 | uint32_t ul ;
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| 197 |
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| 198 | // Test NMI first
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| 199 | if ( (EIC->NMIFLAG.reg & EIC_NMIFLAG_NMI) == EIC_NMIFLAG_NMI )
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| 200 | {
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| 201 | // Call the callback function if assigned
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| 202 | if ( callbacksInt[EXTERNAL_INT_NMI]._callback != NULL )
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| 203 | {
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| 204 | callbacksInt[EXTERNAL_INT_NMI]._callback() ;
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| 205 | }
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| 206 |
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| 207 | // Clear the interrupt
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| 208 | EIC->NMIFLAG.reg = EIC_NMIFLAG_NMI ;
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| 209 | }
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| 210 |
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| 211 | // Test the 16 normal interrupts
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| 212 | for ( ul = EXTERNAL_INT_0 ; ul < EXTERNAL_INT_NMI ; ul++ )
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| 213 | {
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| 214 | if ( (EIC->INTFLAG.reg & ( 1 << ul ) ) != 0 )
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| 215 | {
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| 216 | // Call the callback function if assigned
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| 217 | if ( callbacksInt[ul]._callback != NULL )
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| 218 | {
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| 219 | callbacksInt[ul]._callback() ;
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| 220 | }
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| 221 |
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| 222 | // Clear the interrupt
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| 223 | EIC->INTFLAG.reg = 1 << ul ;
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| 224 | }
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| 225 | }
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| 226 | }
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| 227 |
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| 228 | #ifdef __cplusplus
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| 229 | }
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| 230 | #endif
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