Contiki-NG
watchdog.c
1 /*
2  * Copyright (c) 2005, Swedish Institute of Computer Science
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  * notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  * notice, this list of conditions and the following disclaimer in the
12  * documentation and/or other materials provided with the distribution.
13  * 3. Neither the name of the Institute nor the names of its contributors
14  * may be used to endorse or promote products derived from this software
15  * without specific prior written permission.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20  * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27  * SUCH DAMAGE.
28  *
29  * This file is part of the Contiki operating system.
30  *
31  */
32 
33 #include "contiki.h"
34 #include "dev/watchdog.h"
35 #include "isr_compat.h"
36 
37 static int counter = 0;
38 
39 #define PRINT_STACK_ON_REBOOT 0
40 
41 /*---------------------------------------------------------------------------*/
42 #if PRINT_STACK_ON_REBOOT
43 #ifdef CONTIKI_TARGET_SKY
44 static void
45 printchar(char c)
46 {
47  /* Transmit the data. */
48  TXBUF1 = c;
49 
50  /* Loop until the transmission buffer is available. */
51  while((IFG2 & UTXIFG1) == 0);
52 
53 }
54 /*---------------------------------------------------------------------------*/
55 static void
56 hexprint(uint8_t v)
57 {
58  const char hexconv[] = "0123456789abcdef";
59  printchar(hexconv[v >> 4]);
60  printchar(hexconv[v & 0x0f]);
61 }
62 /*---------------------------------------------------------------------------*/
63 static void
64 printstring(char *s)
65 {
66  while(*s) {
67  printchar(*s++);
68  }
69 }
70 #endif /* CONTIKI_TARGET_SKY */
71 #endif /* PRINT_STACK_ON_REBOOT */
72 /*---------------------------------------------------------------------------*/
73 ISR(WDT, watchdog_interrupt)
74 {
75 #ifdef CONTIKI_TARGET_SKY
76 #if PRINT_STACK_ON_REBOOT
77  uint8_t dummy;
78  static uint8_t *ptr;
79  static int i;
80 
81  ptr = &dummy;
82  printstring("Watchdog reset");
83  printstring("\nStack at $");
84  hexprint(((int)ptr) >> 8);
85  hexprint(((int)ptr) & 0xff);
86  printstring(":\n");
87 
88  for(i = 0; i < 64; ++i) {
89  hexprint(ptr[i]);
90  printchar(' ');
91  if((i & 0x0f) == 0x0f) {
92  printchar('\n');
93  }
94  }
95  printchar('\n');
96 #endif /* PRINT_STACK_ON_REBOOT */
97 #endif /* CONTIKI_TARGET_SKY */
98 
100 }
101 /*---------------------------------------------------------------------------*/
102 void
104 {
105  /* The MSP430 watchdog is enabled at boot-up, so we stop it during
106  initialization. */
107  counter = 0;
108  watchdog_stop();
109 #if CONTIKI_TARGET_WISMOTE
110  SFRIFG1 &= ~WDTIFG;
111  SFRIE1 |= WDTIE;
112 #else
113  IFG1 &= ~WDTIFG;
114  IE1 |= WDTIE;
115 #endif
116 }
117 /*---------------------------------------------------------------------------*/
118 void
120 {
121  /* We setup the watchdog to reset the device after one second,
122  unless watchdog_periodic() is called. */
123  counter--;
124  if(counter == 0) {
125  WDTCTL = WDTPW | WDTCNTCL | WDT_ARST_1000 | WDTTMSEL;
126  }
127 }
128 /*---------------------------------------------------------------------------*/
129 void
131 {
132  /* This function is called periodically to restart the watchdog
133  timer. */
134  /* if(counter < 0) {*/
135  WDTCTL = (WDTCTL & 0xff) | WDTPW | WDTCNTCL | WDTTMSEL;
136  /* }*/
137 }
138 /*---------------------------------------------------------------------------*/
139 void
141 {
142  counter++;
143  if(counter == 1) {
144  WDTCTL = WDTPW | WDTHOLD;
145  }
146 }
147 /*---------------------------------------------------------------------------*/
148 void
150 {
151  WDTCTL = 0;
152 }
153 /*---------------------------------------------------------------------------*/
void watchdog_reboot(void)
Keeps control until the WDT throws a reset signal.
Definition: watchdog.c:94
void watchdog_start(void)
Starts the WDT in watchdog mode if enabled by user configuration, maximum interval.
Definition: watchdog.c:72
void watchdog_init(void)
Initialisation function for the WDT.
Definition: watchdog.c:63
void watchdog_periodic(void)
Writes the WDT clear sequence.
Definition: watchdog.c:85
void watchdog_stop(void)
Stops the WDT such that it won&#39;t timeout and cause MCU reset.
Definition: watchdog.c:140