cpu/msp430/rtimer-arch.c

   1 /*
   2  * Copyright (c) 2007, Swedish Institute of Computer Science.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the Institute nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * This file is part of the Contiki operating system.
  30  *
  31  * $Id: rtimer-arch.c,v 1.13 2010/01/30 14:03:35 adamdunkels Exp $
  32  */
  33
  34 /**
  35  * \file
  36  *         MSP430-specific rtimer code
  37  * \author
  38  *         Adam Dunkels <adam@sics.se>
  39  */
  40
  41 #include <io.h>
  42 #include <signal.h>
  43
  44 #include "sys/energest.h"
  45 #include "sys/rtimer.h"
  46 #include "sys/process.h"
  47
  48 #define DEBUG 0
  49 #if DEBUG
  50 #include <stdio.h>
  51 #define PRINTF(...) printf(__VA_ARGS__)
  52 #else
  53 #define PRINTF(...)
  54 #endif
  55
  56 /*---------------------------------------------------------------------------*/
  57 interrupt(TIMERA0_VECTOR) timera0 (void) {
  58   ENERGEST_ON(ENERGEST_TYPE_IRQ);
  59
  60   rtimer_run_next();
  61   if(process_nevents() > 0) {
  62     LPM4_EXIT;
  63   }
  64
  65   ENERGEST_OFF(ENERGEST_TYPE_IRQ);
  66 }
  67 /*---------------------------------------------------------------------------*/
  68 void
  69 rtimer_arch_init(void)
  70 {
  71   dint();
  72
  73   /* CCR0 interrupt enabled, interrupt occurs when timer equals CCR0. */
  74   TACCTL0 = CCIE;
  75
  76   /* Enable interrupts. */
  77   eint();
  78 }
  79 /*---------------------------------------------------------------------------*/
  80 void
  81 rtimer_arch_schedule(rtimer_clock_t t)
  82 {
  83   PRINTF("rtimer_arch_schedule time %u\n", t);
  84
  85   TACCR0 = t;
  86 }
  87 /*---------------------------------------------------------------------------*/