Contiki 2.6

rtimer-arch.c

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00001 /*
00002  * Copyright (c) 2007, Swedish Institute of Computer Science.
00003  * All rights reserved.
00004  *
00005  * Redistribution and use in source and binary forms, with or without
00006  * modification, are permitted provided that the following conditions
00007  * are met:
00008  * 1. Redistributions of source code must retain the above copyright
00009  *    notice, this list of conditions and the following disclaimer.
00010  * 2. Redistributions in binary form must reproduce the above copyright
00011  *    notice, this list of conditions and the following disclaimer in the
00012  *    documentation and/or other materials provided with the distribution.
00013  * 3. Neither the name of the Institute nor the names of its contributors
00014  *    may be used to endorse or promote products derived from this software
00015  *    without specific prior written permission.
00016  *
00017  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
00018  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00019  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
00020  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
00021  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
00022  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
00023  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
00024  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
00025  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
00026  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00027  * SUCH DAMAGE.
00028  *
00029  * This file is part of the Contiki operating system.
00030  *
00031  * $Id: rtimer-arch.c,v 1.17 2010/11/27 15:27:20 nifi Exp $
00032  */
00033 
00034 /**
00035  * \file
00036  *         MSP430-specific rtimer code
00037  * \author
00038  *         Adam Dunkels <adam@sics.se>
00039  */
00040 
00041 #include "contiki.h"
00042 #include "sys/energest.h"
00043 #include "sys/rtimer.h"
00044 #include "sys/process.h"
00045 #include "dev/watchdog.h"
00046 #include "isr_compat.h"
00047 
00048 #define DEBUG 0
00049 #if DEBUG
00050 #include <stdio.h>
00051 #define PRINTF(...) printf(__VA_ARGS__)
00052 #else
00053 #define PRINTF(...)
00054 #endif
00055 
00056 /*---------------------------------------------------------------------------*/
00057 ISR(TIMER1_A0, timera0)
00058 {
00059   ENERGEST_ON(ENERGEST_TYPE_IRQ);
00060 
00061   watchdog_start();
00062 
00063   rtimer_run_next();
00064 
00065   if(process_nevents() > 0) {
00066     LPM4_EXIT;
00067   }
00068 
00069   watchdog_stop();
00070 
00071   ENERGEST_OFF(ENERGEST_TYPE_IRQ);
00072 }
00073 /*---------------------------------------------------------------------------*/
00074 void
00075 rtimer_arch_init(void)
00076 {
00077   dint();
00078 
00079   /* CCR0 interrupt enabled, interrupt occurs when timer equals CCR0. */
00080   TA1CCTL0 = CCIE;
00081 
00082   /* Enable interrupts. */
00083   eint();
00084 }
00085 /*---------------------------------------------------------------------------*/
00086 rtimer_clock_t
00087 rtimer_arch_now(void)
00088 {
00089   rtimer_clock_t t1, t2;
00090   do {
00091     t1 = TA1R;
00092     t2 = TA1R;
00093   } while(t1 != t2);
00094   return t1;
00095 }
00096 /*---------------------------------------------------------------------------*/
00097 void
00098 rtimer_arch_schedule(rtimer_clock_t t)
00099 {
00100   PRINTF("rtimer_arch_schedule time %u\n", t);
00101 
00102   TA1CCR0 = t;
00103 }
00104 /*---------------------------------------------------------------------------*/