watchdog.c

00001 /*
00002  * Copyright (c) 2005, 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: watchdog.c,v 1.12 2010/11/12 15:54:41 nifi Exp $
00032  */
00033 #include <io.h>
00034 #include <signal.h>
00035 #include "dev/watchdog.h"
00036 
00037 static int counter = 0;
00038 
00039 #define PRINT_STACK_ON_REBOOT 0
00040 
00041 /*---------------------------------------------------------------------------*/
00042 #if PRINT_STACK_ON_REBOOT
00043 #ifdef CONTIKI_TARGET_SKY
00044 static void
00045 printchar(char c)
00046 {
00047   /* Transmit the data. */
00048   TXBUF1 = c;
00049 
00050   /* Loop until the transmission buffer is available. */
00051   while((IFG2 & UTXIFG1) == 0);
00052 
00053 }
00054 /*---------------------------------------------------------------------------*/
00055 static void
00056 hexprint(uint8_t v)
00057 {
00058   const char hexconv[] = "0123456789abcdef";
00059   printchar(hexconv[v >> 4]);
00060   printchar(hexconv[v & 0x0f]);
00061 }
00062 /*---------------------------------------------------------------------------*/
00063 static void
00064 printstring(char *s)
00065 {
00066   while(*s) {
00067     printchar(*s++);
00068   }
00069 }
00070 #endif /* CONTIKI_TARGET_SKY */
00071 #endif /* PRINT_STACK_ON_REBOOT */
00072 /*---------------------------------------------------------------------------*/
00073 interrupt(WDT_VECTOR)
00074 watchdog_interrupt(void)
00075 {
00076 #ifdef CONTIKI_TARGET_SKY
00077 #if PRINT_STACK_ON_REBOOT
00078   uint8_t dummy;
00079   static uint8_t *ptr;
00080   static int i;
00081 
00082   ptr = &dummy;
00083   printstring("Watchdog reset");
00084   printstring("\nStack at $");
00085   hexprint(((int)ptr) >> 8);
00086   hexprint(((int)ptr) & 0xff);
00087   printstring(":\n");
00088 
00089   for(i = 0; i < 64; ++i) {
00090     hexprint(ptr[i]);
00091     printchar(' ');
00092     if((i & 0x0f) == 0x0f) {
00093       printchar('\n');
00094     }
00095   }
00096   printchar('\n');
00097 #endif /* PRINT_STACK_ON_REBOOT */
00098 #endif /* CONTIKI_TARGET_SKY */
00099 
00100   watchdog_reboot();
00101 }
00102 /*---------------------------------------------------------------------------*/
00103 void
00104 watchdog_init(void)
00105 {
00106   /* The MSP430 watchdog is enabled at boot-up, so we stop it during
00107      initialization. */
00108   counter = 0;
00109   watchdog_stop();
00110 
00111   IFG1 &= ~WDTIFG;
00112   IE1 |= WDTIE;
00113 }
00114 /*---------------------------------------------------------------------------*/
00115 void
00116 watchdog_start(void)
00117 {
00118   /* We setup the watchdog to reset the device after one second,
00119      unless watchdog_periodic() is called. */
00120   counter--;
00121   if(counter == 0) {
00122     WDTCTL = WDTPW | WDTCNTCL | WDT_ARST_1000 | WDTTMSEL;
00123   }
00124 }
00125 /*---------------------------------------------------------------------------*/
00126 void
00127 watchdog_periodic(void)
00128 {
00129   /* This function is called periodically to restart the watchdog
00130      timer. */
00131   /*  if(counter < 0) {*/
00132     WDTCTL = (WDTCTL & 0xff) | WDTPW | WDTCNTCL | WDTTMSEL;
00133     /*  }*/
00134 }
00135 /*---------------------------------------------------------------------------*/
00136 void
00137 watchdog_stop(void)
00138 {
00139   counter++;
00140   if(counter == 1) {
00141     WDTCTL = WDTPW | WDTHOLD;
00142   }
00143 }
00144 /*---------------------------------------------------------------------------*/
00145 void
00146 watchdog_reboot(void)
00147 {
00148   WDTCTL = 0;
00149 }
00150 /*---------------------------------------------------------------------------*/

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