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WInterrupts.c
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/* -*- mode: jde; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
Part of the Wiring project - http://wiring.uniandes.edu.co
Copyright (c) 2004-05 Hernando Barragan
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General
Public License along with this library; if not, write to the
Free Software Foundation, Inc., 59 Temple Place, Suite 330,
Boston, MA 02111-1307 USA
Modified 24 November 2006 by David A. Mellis
Modified 1 August 2010 by Mark Sproul
*/
#include <inttypes.h>
#include <avr/io.h>
#include <avr/interrupt.h>
#include <avr/pgmspace.h>
#include <stdio.h>
#include "wiring_private.h"
static void nothing(void) {
}
static volatile voidFuncPtr intFunc[EXTERNAL_NUM_INTERRUPTS] = {
#if EXTERNAL_NUM_INTERRUPTS > 8
#warning There are more than 8 external interrupts. Some callbacks may not be initialized.
nothing,
#endif
#if EXTERNAL_NUM_INTERRUPTS > 7
nothing,
#endif
#if EXTERNAL_NUM_INTERRUPTS > 6
nothing,
#endif
#if EXTERNAL_NUM_INTERRUPTS > 5
nothing,
#endif
#if EXTERNAL_NUM_INTERRUPTS > 4
nothing,
#endif
#if EXTERNAL_NUM_INTERRUPTS > 3
nothing,
#endif
#if EXTERNAL_NUM_INTERRUPTS > 2
nothing,
#endif
#if EXTERNAL_NUM_INTERRUPTS > 1
nothing,
#endif
#if EXTERNAL_NUM_INTERRUPTS > 0
nothing,
#endif
};
void attachInterrupt(uint8_t interruptNum, void (*userFunc)(void), int mode) {
if(interruptNum < EXTERNAL_NUM_INTERRUPTS) {
intFunc[interruptNum] = userFunc;
// Configure the interrupt mode (trigger on low input, any change, rising
// edge, or falling edge). The mode constants were chosen to correspond
// to the configuration bits in the hardware register, so we simply shift
// the mode into place.
// Enable the interrupt.
switch (interruptNum) {
#if defined(__AVR_ATmega32U4__)
// I hate doing this, but the register assignment differs between the 1280/2560
// and the 32U4. Since avrlib defines registers PCMSK1 and PCMSK2 that aren't
// even present on the 32U4 this is the only way to distinguish between them.
case 0:
EICRA = (EICRA & ~((1<<ISC00) | (1<<ISC01))) | (mode << ISC00);
EIMSK |= (1<<INT0);
break;
case 1:
EICRA = (EICRA & ~((1<<ISC10) | (1<<ISC11))) | (mode << ISC10);
EIMSK |= (1<<INT1);
break;
case 2:
EICRA = (EICRA & ~((1<<ISC20) | (1<<ISC21))) | (mode << ISC20);
EIMSK |= (1<<INT2);
break;
case 3:
EICRA = (EICRA & ~((1<<ISC30) | (1<<ISC31))) | (mode << ISC30);
EIMSK |= (1<<INT3);
break;
case 4:
EICRB = (EICRB & ~((1<<ISC60) | (1<<ISC61))) | (mode << ISC60);
EIMSK |= (1<<INT6);
break;
#elif defined(EICRA) && defined(EICRB) && defined(EIMSK)
case 2:
EICRA = (EICRA & ~((1 << ISC00) | (1 << ISC01))) | (mode << ISC00);
EIMSK |= (1 << INT0);
break;
case 3:
EICRA = (EICRA & ~((1 << ISC10) | (1 << ISC11))) | (mode << ISC10);
EIMSK |= (1 << INT1);
break;
case 4:
EICRA = (EICRA & ~((1 << ISC20) | (1 << ISC21))) | (mode << ISC20);
EIMSK |= (1 << INT2);
break;
case 5:
EICRA = (EICRA & ~((1 << ISC30) | (1 << ISC31))) | (mode << ISC30);
EIMSK |= (1 << INT3);
break;
case 0:
EICRB = (EICRB & ~((1 << ISC40) | (1 << ISC41))) | (mode << ISC40);
EIMSK |= (1 << INT4);
break;
case 1:
EICRB = (EICRB & ~((1 << ISC50) | (1 << ISC51))) | (mode << ISC50);
EIMSK |= (1 << INT5);
break;
case 6:
EICRB = (EICRB & ~((1 << ISC60) | (1 << ISC61))) | (mode << ISC60);
EIMSK |= (1 << INT6);
break;
case 7:
EICRB = (EICRB & ~((1 << ISC70) | (1 << ISC71))) | (mode << ISC70);
EIMSK |= (1 << INT7);
break;
#else
case 0:
#if defined(EICRA) && defined(ISC00) && defined(EIMSK)
EICRA = (EICRA & ~((1 << ISC00) | (1 << ISC01))) | (mode << ISC00);
EIMSK |= (1 << INT0);
#elif defined(MCUCR) && defined(ISC00) && defined(GICR)
MCUCR = (MCUCR & ~((1 << ISC00) | (1 << ISC01))) | (mode << ISC00);
GICR |= (1 << INT0);
#elif defined(MCUCR) && defined(ISC00) && defined(GIMSK)
MCUCR = (MCUCR & ~((1 << ISC00) | (1 << ISC01))) | (mode << ISC00);
GIMSK |= (1 << INT0);
#else
#error attachInterrupt not finished for this CPU (case 0)
#endif
break;
case 1:
#if defined(EICRA) && defined(ISC10) && defined(ISC11) && defined(EIMSK)
EICRA = (EICRA & ~((1 << ISC10) | (1 << ISC11))) | (mode << ISC10);
EIMSK |= (1 << INT1);
#elif defined(MCUCR) && defined(ISC10) && defined(ISC11) && defined(GICR)
MCUCR = (MCUCR & ~((1 << ISC10) | (1 << ISC11))) | (mode << ISC10);
GICR |= (1 << INT1);
#elif defined(MCUCR) && defined(ISC10) && defined(GIMSK) && defined(GIMSK)
MCUCR = (MCUCR & ~((1 << ISC10) | (1 << ISC11))) | (mode << ISC10);
GIMSK |= (1 << INT1);
#else
#warning attachInterrupt may need some more work for this cpu (case 1)
#endif
break;
case 2:
#if defined(EICRA) && defined(ISC20) && defined(ISC21) && defined(EIMSK)
EICRA = (EICRA & ~((1 << ISC20) | (1 << ISC21))) | (mode << ISC20);
EIMSK |= (1 << INT2);
#elif defined(MCUCR) && defined(ISC20) && defined(ISC21) && defined(GICR)
MCUCR = (MCUCR & ~((1 << ISC20) | (1 << ISC21))) | (mode << ISC20);
GICR |= (1 << INT2);
#elif defined(MCUCR) && defined(ISC20) && defined(GIMSK) && defined(GIMSK)
MCUCR = (MCUCR & ~((1 << ISC20) | (1 << ISC21))) | (mode << ISC20);
GIMSK |= (1 << INT2);
#endif
break;
#endif
}
}
}
void detachInterrupt(uint8_t interruptNum) {
if(interruptNum < EXTERNAL_NUM_INTERRUPTS) {
// Disable the interrupt. (We can't assume that interruptNum is equal
// to the number of the EIMSK bit to clear, as this isn't true on the
// ATmega8. There, INT0 is 6 and INT1 is 7.)
switch (interruptNum) {
#if defined(__AVR_ATmega32U4__)
case 0:
EIMSK &= ~(1<<INT0);
break;
case 1:
EIMSK &= ~(1<<INT1);
break;
case 2:
EIMSK &= ~(1<<INT2);
break;
case 3:
EIMSK &= ~(1<<INT3);
break;
case 4:
EIMSK &= ~(1<<INT6);
break;
#elif defined(EICRA) && defined(EICRB) && defined(EIMSK)
case 2:
EIMSK &= ~(1 << INT0);
break;
case 3:
EIMSK &= ~(1 << INT1);
break;
case 4:
EIMSK &= ~(1 << INT2);
break;
case 5:
EIMSK &= ~(1 << INT3);
break;
case 0:
EIMSK &= ~(1 << INT4);
break;
case 1:
EIMSK &= ~(1 << INT5);
break;
case 6:
EIMSK &= ~(1 << INT6);
break;
case 7:
EIMSK &= ~(1 << INT7);
break;
#else
case 0:
#if defined(EIMSK) && defined(INT0)
EIMSK &= ~(1 << INT0);
#elif defined(GICR) && defined(ISC00)
GICR &= ~(1 << INT0); // atmega32
#elif defined(GIMSK) && defined(INT0)
GIMSK &= ~(1 << INT0);
#else
#error detachInterrupt not finished for this cpu
#endif
break;
case 1:
#if defined(EIMSK) && defined(INT1)
EIMSK &= ~(1 << INT1);
#elif defined(GICR) && defined(INT1)
GICR &= ~(1 << INT1); // atmega32
#elif defined(GIMSK) && defined(INT1)
GIMSK &= ~(1 << INT1);
#else
#warning detachInterrupt may need some more work for this cpu (case 1)
#endif
break;
case 2:
#if defined(EIMSK) && defined(INT2)
EIMSK &= ~(1 << INT2);
#elif defined(GICR) && defined(INT2)
GICR &= ~(1 << INT2); // atmega32
#elif defined(GIMSK) && defined(INT2)
GIMSK &= ~(1 << INT2);
#elif defined(INT2)
#warning detachInterrupt may need some more work for this cpu (case 2)
#endif
break;
#endif
}
intFunc[interruptNum] = nothing;
}
}
#define IMPLEMENT_ISR(vect, interrupt) \
ISR(vect) { \
intFunc[interrupt](); \
}
#if defined(__AVR_ATmega32U4__)
IMPLEMENT_ISR(INT0_vect, EXTERNAL_INT_0)
IMPLEMENT_ISR(INT1_vect, EXTERNAL_INT_1)
IMPLEMENT_ISR(INT2_vect, EXTERNAL_INT_2)
IMPLEMENT_ISR(INT3_vect, EXTERNAL_INT_3)
IMPLEMENT_ISR(INT6_vect, EXTERNAL_INT_4)
#elif defined(EICRA) && defined(EICRB)
IMPLEMENT_ISR(INT0_vect, EXTERNAL_INT_2)
IMPLEMENT_ISR(INT1_vect, EXTERNAL_INT_3)
IMPLEMENT_ISR(INT2_vect, EXTERNAL_INT_4)
IMPLEMENT_ISR(INT3_vect, EXTERNAL_INT_5)
IMPLEMENT_ISR(INT4_vect, EXTERNAL_INT_0)
IMPLEMENT_ISR(INT5_vect, EXTERNAL_INT_1)
IMPLEMENT_ISR(INT6_vect, EXTERNAL_INT_6)
IMPLEMENT_ISR(INT7_vect, EXTERNAL_INT_7)
#else
IMPLEMENT_ISR(INT0_vect, EXTERNAL_INT_0)
IMPLEMENT_ISR(INT1_vect, EXTERNAL_INT_1)
#if defined(EICRA) && defined(ISC20)
IMPLEMENT_ISR(INT2_vect, EXTERNAL_INT_2)
#endif
#endif