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 * @(#)$Id: watchdog.c,v 1.12 2010/11/12 15:54:41 nifi Exp $ 00032 */ 00033 00034 #include "contiki.h" 00035 #include "dev/watchdog.h" 00036 #include "isr_compat.h" 00037 00038 static int counter = 0; 00039 00040 #define PRINT_STACK_ON_REBOOT 0 00041 00042 /*---------------------------------------------------------------------------*/ 00043 #if PRINT_STACK_ON_REBOOT 00044 #ifdef CONTIKI_TARGET_SKY 00045 static void 00046 printchar(char c) 00047 { 00048 /* Transmit the data. */ 00049 TXBUF1 = c; 00050 00051 /* Loop until the transmission buffer is available. */ 00052 while((IFG2 & UTXIFG1) == 0); 00053 00054 } 00055 /*---------------------------------------------------------------------------*/ 00056 static void 00057 hexprint(uint8_t v) 00058 { 00059 const char hexconv[] = "0123456789abcdef"; 00060 printchar(hexconv[v >> 4]); 00061 printchar(hexconv[v & 0x0f]); 00062 } 00063 /*---------------------------------------------------------------------------*/ 00064 static void 00065 printstring(char *s) 00066 { 00067 while(*s) { 00068 printchar(*s++); 00069 } 00070 } 00071 #endif /* CONTIKI_TARGET_SKY */ 00072 #endif /* PRINT_STACK_ON_REBOOT */ 00073 /*---------------------------------------------------------------------------*/ 00074 ISR(WDT, watchdog_interrupt) 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 #if CONTIKI_TARGET_WISMOTE 00111 SFRIFG1 &= ~WDTIFG; 00112 SFRIE1 |= WDTIE; 00113 #else 00114 IFG1 &= ~WDTIFG; 00115 IE1 |= WDTIE; 00116 #endif 00117 } 00118 /*---------------------------------------------------------------------------*/ 00119 void 00120 watchdog_start(void) 00121 { 00122 /* We setup the watchdog to reset the device after one second, 00123 unless watchdog_periodic() is called. */ 00124 counter--; 00125 if(counter == 0) { 00126 WDTCTL = WDTPW | WDTCNTCL | WDT_ARST_1000 | WDTTMSEL; 00127 } 00128 } 00129 /*---------------------------------------------------------------------------*/ 00130 void 00131 watchdog_periodic(void) 00132 { 00133 /* This function is called periodically to restart the watchdog 00134 timer. */ 00135 /* if(counter < 0) {*/ 00136 WDTCTL = (WDTCTL & 0xff) | WDTPW | WDTCNTCL | WDTTMSEL; 00137 /* }*/ 00138 } 00139 /*---------------------------------------------------------------------------*/ 00140 void 00141 watchdog_stop(void) 00142 { 00143 counter++; 00144 if(counter == 1) { 00145 WDTCTL = WDTPW | WDTHOLD; 00146 } 00147 } 00148 /*---------------------------------------------------------------------------*/ 00149 void 00150 watchdog_reboot(void) 00151 { 00152 WDTCTL = 0; 00153 } 00154 /*---------------------------------------------------------------------------*/