Contiki 2.6
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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 */ 00032 00033 /* Watchdog routines for the AVR */ 00034 00035 /* The default timeout of 2 seconds works on most MCUs. 00036 * It should be disabled during sleep (unless used for wakeup) since 00037 * it draws significant current (~5 uamp on 1284p, 20x the MCU consumption). 00038 * 00039 * Note the wdt is not properly simulated in AVR Studio 4 Simulator 1: 00040 * On many devices calls to wdt_reset will have no effect, and a wdt reboot will occur. 00041 * The MCUSR will not show the cause of a wdt reboot. 00042 * A 1MHz clock is assumed; at 8MHz timeout occurs 8x faster than it should. 00043 * Simulator 2 is supposed to work on supported devices (not atmega128rfa1), 00044 * but neither it nor Studio 5 beta do any resets on the 1284p. 00045 * 00046 * Setting WATCHDOG_CONF_TIMEOUT -1 will disable the WDT. 00047 */ 00048 //#define WATCHDOG_CONF_TIMEOUT -1 00049 00050 #ifndef WATCHDOG_CONF_TIMEOUT 00051 #define WATCHDOG_CONF_TIMEOUT WDTO_2S 00052 #endif 00053 00054 /* While balancing start and stop calls is a good idea, an imbalance will cause 00055 * resets that can take a lot of time to track down. 00056 * Some low power protocols may cause this. 00057 * The default is no balance; define WATCHDOG_CONF_BALANCE 1 to override. 00058 */ 00059 #ifndef WATCHDOG_CONF_BALANCE 00060 #define WATCHDOG_CONF_BALANCE 0 00061 #endif 00062 00063 #include "dev/watchdog.h" 00064 #include <avr/wdt.h> 00065 #include <avr/interrupt.h> 00066 00067 //Not all AVR toolchains alias MCUSR to the older MSUSCR name 00068 //#if defined (__AVR_ATmega8__) || defined (__AVR_ATmega8515__) || defined (__AVR_ATmega16__) 00069 #if !defined (MCUSR) && defined (MCUCSR) 00070 #warning *** MCUSR not defined, using MCUCSR instead *** 00071 #define MCUSR MCUCSR 00072 #endif 00073 00074 #if WATCHDOG_CONF_BALANCE && WATCHDOG_CONF_TIMEOUT >= 0 00075 static int stopped = 0; 00076 #endif 00077 00078 /*---------------------------------------------------------------------------*/ 00079 void 00080 watchdog_init(void) 00081 { 00082 /* Clear startup bit and disable the wdt, whether or not it will be used. 00083 Random code may have caused the last reset. 00084 */ 00085 MCUSR&=~(1<<WDRF); 00086 wdt_disable(); 00087 #if WATCHDOG_CONF_BALANCE && WATCHDOG_CONF_TIMEOUT >= 0 00088 stopped = 1; 00089 #endif 00090 } 00091 /*---------------------------------------------------------------------------*/ 00092 void 00093 watchdog_start(void) 00094 { 00095 #if WATCHDOG_CONF_TIMEOUT >= 0 00096 #if WATCHDOG_CONF_BALANCE 00097 stopped--; 00098 if(!stopped) 00099 #endif 00100 wdt_enable(WATCHDOG_CONF_TIMEOUT); 00101 #endif 00102 } 00103 /*---------------------------------------------------------------------------*/ 00104 void 00105 watchdog_periodic(void) 00106 { 00107 #if WATCHDOG_CONF_TIMEOUT >= 0 00108 #if WATCHDOG_CONF_BALANCE 00109 if(!stopped) 00110 #endif 00111 wdt_reset(); 00112 #endif 00113 } 00114 /*---------------------------------------------------------------------------*/ 00115 void 00116 watchdog_stop(void) 00117 { 00118 #if WATCHDOG_CONF_TIMEOUT >= 0 00119 #if WATCHDOG_CONF_BALANCE 00120 stopped++; 00121 #endif 00122 wdt_disable(); 00123 #endif 00124 } 00125 /*---------------------------------------------------------------------------*/ 00126 void 00127 watchdog_reboot(void) 00128 { 00129 cli(); 00130 wdt_enable(WDTO_15MS); //wd on,250ms 00131 while(1); //loop 00132 } 00133 /*---------------------------------------------------------------------------*/ 00134 #if 0 00135 /* Not all AVRs implement the wdt interrupt */ 00136 ISR(WDT_vect) 00137 { 00138 } 00139 #endif