Contiki 2.6

watchdog-cc2430.c

Go to the documentation of this file.
00001 /*
00002  * Copyright (c) 2010, Loughborough University - 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 
00032 /**
00033  * \file
00034  *         Hardware-dependent functions used for the cc2430 watchdog timer.
00035  *
00036  *         This file contains an ISR and must reside in the HOME bank.
00037  *
00038  * \author
00039  *         George Oikonomou - <oikonomou@users.sourceforge.net>
00040  */
00041 
00042 #include "sys/energest.h"
00043 #include "cc2430_sfr.h"
00044 #include "contiki-conf.h"
00045 #include "dev/watchdog-cc2430.h"
00046 
00047 /*---------------------------------------------------------------------------*/
00048 /* The watchdog only throws interrupts in timer mode */
00049 #if WDT_TIMER_MODE
00050 void
00051 cc4230_watchdog_ISR(void) __interrupt (WDT_VECTOR)
00052 {
00053   EA = 0;
00054   ENERGEST_ON(ENERGEST_TYPE_IRQ);
00055   /* Do something */
00056   IRCON2 &= ~WDTIF;
00057   ENERGEST_OFF(ENERGEST_TYPE_IRQ);
00058   EA = 1;
00059 }
00060 #endif
00061 /*---------------------------------------------------------------------------*/
00062 void
00063 watchdog_init(void)
00064 {
00065   WDCTL = WDT_TIMER_MODE | WDT_INTERVAL;
00066 
00067 #if WDT_TIMER_MODE
00068   /* Enable the watchdog interrupts in timer mode */
00069   IEN2 |= WDTIE;
00070 #endif
00071   return;
00072 }
00073 /*---------------------------------------------------------------------------*/
00074 void
00075 watchdog_start(void)
00076 {
00077   WDCTL |= WDT_EN;
00078 }
00079 /*---------------------------------------------------------------------------*/
00080 void
00081 watchdog_periodic(void)
00082 {
00083 #if WDT_TIMER_MODE
00084   /* In timer mode, all we need to do is write 1 to WDT:CLR[0] */
00085   WDCTL |= WDT_CLR0;
00086 #else
00087   /* Write the 'clear' sequence while maintaining mode and interval setting */
00088   WDCTL = (WDCTL & 0x0F) | WDT_CLR3 | WDT_CLR1;
00089   WDCTL = (WDCTL & 0x0F) | WDT_CLR2 | WDT_CLR0;
00090 #endif
00091 }
00092 /*---------------------------------------------------------------------------*/
00093 void
00094 watchdog_stop(void)
00095 {
00096 #if WDT_TIMER_MODE
00097   /* In timer mode, the watchdog can actually be stopped */
00098   WDCTL &= ~WDT_EN;
00099   IRCON2 &= ~WDTIF;
00100 #else
00101   /* In watchdog mode, stopping is impossible so we just reset the timer */
00102   watchdog_periodic();
00103 #endif
00104 }
00105 /*---------------------------------------------------------------------------*/
00106 void
00107 watchdog_reboot(void)
00108 {
00109 #if WDT_TIMER_MODE
00110   /* Switch modes to watchdog, minimum interval, enable */
00111   WDCTL = WDT_EN | WDT_TIMEOUT_2_MSEC;
00112 #else
00113   /* Let's get this over with ASAP */
00114   WDCTL = WDT_TIMEOUT_2_MSEC;
00115 #endif
00116   /* Dis-acknowledge all interrupts while we wait for the dog to bark */
00117   DISABLE_INTERRUPTS();
00118   /* NOP till the dog barks... */
00119   while(1) {
00120     __asm
00121       nop
00122     __endasm;
00123   }
00124 }