mirror of
https://github.com/digistump/DigistumpArduino.git
synced 2025-04-27 15:19:02 -07:00
156 lines
4.4 KiB
C
156 lines
4.4 KiB
C
/* -*- 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 28-08-2009 for attiny84 R.Wiersma
|
|
Modified 09-10-2009 for attiny45 A.Saporetti
|
|
Modified 20-11-2010 - B.Cook - Correct a minor bug in attachInterrupt
|
|
*/
|
|
|
|
#include <inttypes.h>
|
|
#include <avr/io.h>
|
|
#include <avr/interrupt.h>
|
|
#include <avr/pgmspace.h>
|
|
#include <stdio.h>
|
|
|
|
#include "wiring_private.h"
|
|
|
|
volatile static voidFuncPtr intFunc[NUMBER_EXTERNAL_INTERRUPTS];
|
|
|
|
#if defined( MCUCR ) && ! defined( EICRA )
|
|
#define EICRA MCUCR
|
|
#endif
|
|
|
|
#if defined( GIMSK ) && ! defined( EIMSK )
|
|
#define EIMSK GIMSK
|
|
#endif
|
|
|
|
void attachInterrupt(uint8_t interruptNum, void (*userFunc)(void), int mode)
|
|
{
|
|
if ( interruptNum < NUMBER_EXTERNAL_INTERRUPTS )
|
|
{
|
|
/*
|
|
If attachInterrupt is called in succession for the same
|
|
interruptNum but a different userFunc then the following line
|
|
is not safe. Changing intFunc is not atomic.
|
|
intFunc[interruptNum] = userFunc;
|
|
*/
|
|
{
|
|
// save interrupt flag
|
|
uint8_t SaveSREG = SREG;
|
|
// disable interrupts
|
|
cli();
|
|
// access the shared data
|
|
intFunc[interruptNum] = userFunc;
|
|
// restore the interrupt flag
|
|
SREG = SaveSREG;
|
|
}
|
|
|
|
// 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 NUMBER_EXTERNAL_INTERRUPTS >= 1
|
|
case EXTERNAL_INTERRUPT_0:
|
|
EICRA = (EICRA & ~((1 << ISC00) | (1 << ISC01))) | (mode << ISC00);
|
|
EIMSK |= (1 << INT0);
|
|
break;
|
|
#endif
|
|
|
|
#if NUMBER_EXTERNAL_INTERRUPTS >= 2 && !defined(ISC11)
|
|
//For ATtiny861, but interrupts share the same vector.
|
|
case EXTERNAL_INTERRUPT_1:
|
|
EICRA = (EICRA & ~((1 << ISC00) | (1 << ISC01))) | (mode << ISC00);
|
|
EIMSK |= (1 << INT1);
|
|
break;
|
|
#endif
|
|
|
|
#if NUMBER_EXTERNAL_INTERRUPTS >= 2 && defined(ISC11)
|
|
case EXTERNAL_INTERRUPT_1:
|
|
EICRA = (EICRA & ~((1 << ISC10) | (1 << ISC11))) | (mode << ISC10);
|
|
EIMSK |= (1 << INT1);
|
|
break;
|
|
#endif
|
|
|
|
#if NUMBER_EXTERNAL_INTERRUPTS > 2
|
|
#error Add handlers for the additional interrupts.
|
|
#endif
|
|
}
|
|
}
|
|
}
|
|
|
|
void detachInterrupt(uint8_t interruptNum)
|
|
{
|
|
if ( interruptNum < NUMBER_EXTERNAL_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 NUMBER_EXTERNAL_INTERRUPTS >= 1
|
|
case EXTERNAL_INTERRUPT_0:
|
|
EIMSK &= ~(1 << INT0);
|
|
break;;
|
|
#endif
|
|
|
|
#if NUMBER_EXTERNAL_INTERRUPTS >= 2
|
|
case EXTERNAL_INTERRUPT_1:
|
|
EIMSK &= ~(1 << INT1);
|
|
break;;
|
|
#endif
|
|
|
|
#if NUMBER_EXTERNAL_INTERRUPTS > 2
|
|
#error Add handlers for the additional interrupts.
|
|
#endif
|
|
}
|
|
intFunc[interruptNum] = 0;
|
|
}
|
|
}
|
|
|
|
#if NUMBER_EXTERNAL_INTERRUPTS >= 1
|
|
ISR(EXTERNAL_INTERRUPT_0_vect)
|
|
{
|
|
if(intFunc[EXTERNAL_INTERRUPT_0])
|
|
intFunc[EXTERNAL_INTERRUPT_0]();
|
|
}
|
|
#endif
|
|
|
|
#if NUMBER_EXTERNAL_INTERRUPTS >= 2
|
|
ISR(EXTERNAL_INTERRUPT_1_vect)
|
|
{
|
|
if(intFunc[EXTERNAL_INTERRUPT_1])
|
|
intFunc[EXTERNAL_INTERRUPT_1]();
|
|
}
|
|
#endif
|
|
|
|
#if NUMBER_EXTERNAL_INTERRUPTS > 2
|
|
#error Add handlers for the additional interrupts.
|
|
#endif
|