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99 lines
2.6 KiB
C
Executable File
99 lines
2.6 KiB
C
Executable File
/* -*- mode: jde; c-basic-offset: 2; indent-tabs-mode: nil -*- */
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/*
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Part of the Wiring project - http://wiring.uniandes.edu.co
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Copyright (c) 2004-05 Hernando Barragan
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General
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Public License along with this library; if not, write to the
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Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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Boston, MA 02111-1307 USA
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Modified 24 November 2006 by David A. Mellis
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*/
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#include <inttypes.h>
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#include <avr/io.h>
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#include <avr/interrupt.h>
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#include <avr/signal.h>
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#include <avr/pgmspace.h>
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#include <stdio.h>
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#include "WConstants.h"
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#include "wiring_private.h"
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volatile static voidFuncPtr intFunc[EXTERNAL_NUM_INTERRUPTS];
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// volatile static voidFuncPtr twiIntFunc;
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#if defined(__AVR_ATmega168__)
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#define MCUCR EICRA
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#define GICR EIMSK
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#endif
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void attachInterrupt(uint8_t interruptNum, void (*userFunc)(void), int mode) {
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if(interruptNum < EXTERNAL_NUM_INTERRUPTS) {
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intFunc[interruptNum] = userFunc;
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if (interruptNum == 0) {
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// Configure the interrupt mode (trigger on low input, any change, rising
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// edge, or falling edge). The mode constants were chosen to correspond
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// to the configuration bits in the hardware register, so we simply shift
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// the mode into place.
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MCUCR = (MCUCR & ~((1 << ISC00) | (1 << ISC01))) | (mode << ISC00);
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// Enable the interrupt.
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GICR |= (1 << INT0);
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} else {
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MCUCR = (MCUCR & ~((1 << ISC10) | (1 << ISC11))) | (mode << ISC10);
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GICR |= (1 << INT1);
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}
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}
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}
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void detachInterrupt(uint8_t interruptNum) {
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if(interruptNum < EXTERNAL_NUM_INTERRUPTS) {
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if (interruptNum == 0)
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// Disable the interrupt.
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GICR &= ~(1 << INT0);
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else
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GICR &= ~(1 << INT1);
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intFunc[interruptNum] = 0;
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}
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}
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/*
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void attachInterruptTwi(void (*userFunc)(void) ) {
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twiIntFunc = userFunc;
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}
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*/
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SIGNAL(SIG_INTERRUPT0) {
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if(intFunc[EXTERNAL_INT_0])
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intFunc[EXTERNAL_INT_0]();
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}
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SIGNAL(SIG_INTERRUPT1) {
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if(intFunc[EXTERNAL_INT_1])
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intFunc[EXTERNAL_INT_1]();
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}
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/*
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SIGNAL(SIG_2WIRE_SERIAL) {
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if(twiIntFunc)
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twiIntFunc();
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}
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*/
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