150 lines
4.4 KiB
C
150 lines
4.4 KiB
C
/* Copyright (c) 2002, Marek Michalkiewicz
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the
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distribution.
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Neither the name of the copyright holders nor the names of
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contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE. */
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/* $Id: interrupt.h,v 1.1 2011-01-25 09:40:04 plazar Exp $ */
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#ifndef _AVR_INTERRUPT_H_
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#define _AVR_INTERRUPT_H_
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#include <arch/io.h>
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/** \name Global manipulation of the interrupt flag
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The global interrupt flag is maintained in the I bit of the status
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register (SREG). */
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/*@{*/
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/** \def sei()
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\ingroup avr_interrupts
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\code#include <arch/interrupt.h>\endcode
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Enables interrupts by clearing the global interrupt mask. This function
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actually compiles into a single line of assembly, so there is no function
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call overhead. */
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#define sei() __asm__ __volatile__ ("sei" ::)
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/** \def cli()
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\ingroup avr_interrupts
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\code#include <arch/interrupt.h>\endcode
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Disables all interrupts by clearing the global interrupt mask. This function
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actually compiles into a single line of assembly, so there is no function
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call overhead. */
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#define cli() __asm__ __volatile__ ("cli" ::)
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/*@}*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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/** \name Allowing specific system-wide interrupts
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In addition to globally enabling interrupts, each device's particular
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interrupt needs to be enabled separately if interrupts for this device are
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desired. While some devices maintain their interrupt enable bit inside
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the device's register set, external and timer interrupts have system-wide
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configuration registers.
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Example:
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\code
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// Enable timer 1 overflow interrupts.
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timer_enable_int(_BV(TOIE1));
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// Do some work...
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// Disable all timer interrupts.
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timer_enable_int(0);
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\endcode
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\note Be careful when you use these functions. If you already have a
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different interrupt enabled, you could inadvertantly disable it by
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enabling another intterupt. */
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/*@{*/
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/** \ingroup avr_interrupts
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\def enable_external_int(mask)
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\code#include <arch/interrupt.h>\endcode
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This macro gives access to the \c GIMSK register (or \c EIMSK register
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if using an AVR Mega device or \c GICR register for others). Although this
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macro is essentially the same as assigning to the register, it does
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adapt slightly to the type of device being used. This macro is
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unavailable if none of the registers listed above are defined. */
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/* Define common register definition if available. */
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#if defined(EIMSK)
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#define __EICR EIMSK
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#endif
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#if defined(GIMSK)
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#define __EICR GIMSK
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#endif
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#if defined(GICR)
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#define __EICR GICR
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//printf("--EICR=GICR");//FN 5-1-06
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#endif
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/* If common register defined, define macro. */
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#if defined(__EICR) || defined(DOXYGEN)
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#define enable_external_int(mask) (__EICR = mask)
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#endif
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/** \ingroup avr_interrupts
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\code#include <arch/interrupt.h>\endcode
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This function modifies the \c timsk register.
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The value you pass via \c ints is device specific. */
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#define __inline__ inline
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static __inline__ void timer_enable_int ( unsigned char ints )
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{
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#ifdef TIMSK
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TIMSK = ints;
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#endif
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}
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/*@}*/
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#ifdef __cplusplus
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}
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#endif
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#endif
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