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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