contiki/cpu/msp430/rtimer-arch.c

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/*
* Copyright (c) 2007, Swedish Institute of Computer Science.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* This file is part of the Contiki operating system.
*
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* $Id: rtimer-arch.c,v 1.17 2010/11/27 15:27:20 nifi Exp $
*/
/**
* \file
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* MSP430-specific rtimer code
* \author
* Adam Dunkels <adam@sics.se>
*/
#include <io.h>
#include <signal.h>
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#include "sys/energest.h"
#include "sys/rtimer.h"
#include "sys/process.h"
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#include "dev/watchdog.h"
#define DEBUG 0
#if DEBUG
#include <stdio.h>
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...)
#endif
/*---------------------------------------------------------------------------*/
interrupt(TIMERA0_VECTOR) timera0 (void) {
ENERGEST_ON(ENERGEST_TYPE_IRQ);
watchdog_start();
rtimer_run_next();
if(process_nevents() > 0) {
LPM4_EXIT;
}
watchdog_stop();
ENERGEST_OFF(ENERGEST_TYPE_IRQ);
}
/*---------------------------------------------------------------------------*/
void
rtimer_arch_init(void)
{
dint();
/* CCR0 interrupt enabled, interrupt occurs when timer equals CCR0. */
TACCTL0 = CCIE;
/* Enable interrupts. */
eint();
}
/*---------------------------------------------------------------------------*/
rtimer_clock_t
rtimer_arch_now(void)
{
rtimer_clock_t t1, t2;
do {
t1 = TAR;
t2 = TAR;
} while(t1 != t2);
return t1;
}
/*---------------------------------------------------------------------------*/
void
rtimer_arch_schedule(rtimer_clock_t t)
{
PRINTF("rtimer_arch_schedule time %u\n", t);
TACCR0 = t;
}
/*---------------------------------------------------------------------------*/