110 lines
3.4 KiB
C
110 lines
3.4 KiB
C
/*
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* Copyright (c) 2007, Swedish Institute of Computer Science.
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* All rights reserved.
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*
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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
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* are met:
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* 1. 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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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* 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 INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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* $Id: rtimer-arch.c,v 1.4 2007/05/22 20:59:47 adamdunkels Exp $
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*/
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/**
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* \file
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* MSP430-specific rtimer code
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* \author
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* Adam Dunkels <adam@sics.se>
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*/
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#include <io.h>
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#include <signal.h>
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#include "lib/energest.h"
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#include "sys/rtimer.h"
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#define DEBUG 0
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#if DEBUG
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#include <stdio.h>
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#define PRINTF(...) printf(__VA_ARGS__)
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#else
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#define PRINTF(...)
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#endif
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static rtimer_clock_t offset;
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/*---------------------------------------------------------------------------*/
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interrupt(TIMERB1_VECTOR) timerb1 (void) {
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ENERGEST_ON(ENERGEST_TYPE_IRQ);
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if(TBIV == 2) {
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rtimer_run_next();
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}
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ENERGEST_OFF(ENERGEST_TYPE_IRQ);
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}
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/*---------------------------------------------------------------------------*/
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void
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rtimer_arch_init(void)
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{
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dint();
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offset = 0;
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/* Select SMCLK (2.4576MHz), clear TAR; This makes the rtimer count
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the number of processor cycles executed by the CPU. */
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//TBCTL = TBSSEL1 | TBCLR;
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/* Select ACLK 32768Hz clock, divide by 8 */
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TBCTL = TBSSEL0 | TBCLR | ID_3;
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/* CCR1 interrupt enabled, interrupt occurs when timer equals CCR1. */
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TBCCTL1 = CCIE;
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/* Start Timer_B in continuous mode. */
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TBCTL |= MC1;
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BCSCTL1 &= ~(DIVA1 + DIVA0); /* remove /8 divisor from ACLK again */
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/* Enable interrupts. */
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eint();
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}
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/*---------------------------------------------------------------------------*/
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void
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rtimer_arch_schedule(rtimer_clock_t t)
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{
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PRINTF("rtimer_arch_schedule time %u\n", t);
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TBCCR1 = t + offset;
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}
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/*---------------------------------------------------------------------------*/
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/*rtimer_clock_t
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rtimer_arch_now(void)
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{
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return TBR + offset;
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}*/
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/*---------------------------------------------------------------------------*/
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void
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rtimer_arch_set(rtimer_clock_t t)
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{
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offset = t - TBR;
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}
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/*---------------------------------------------------------------------------*/
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