Contiki-NG
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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
37static int counter = 0;
38
39#define PRINT_STACK_ON_REBOOT 0
40
41/*---------------------------------------------------------------------------*/
42#if PRINT_STACK_ON_REBOOT
43#ifdef CONTIKI_TARGET_SKY
44static void
45printchar(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/*---------------------------------------------------------------------------*/
55static void
56hexprint(uint8_t v)
57{
58 const char hexconv[] = "0123456789abcdef";
59 printchar(hexconv[v >> 4]);
60 printchar(hexconv[v & 0x0f]);
61}
62/*---------------------------------------------------------------------------*/
63static void
64printstring(char *s)
65{
66 while(*s) {
67 printchar(*s++);
68 }
69}
70#endif /* CONTIKI_TARGET_SKY */
71#endif /* PRINT_STACK_ON_REBOOT */
72/*---------------------------------------------------------------------------*/
73ISR(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
99 watchdog_reboot();
100}
101/*---------------------------------------------------------------------------*/
102void
103watchdog_init(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/*---------------------------------------------------------------------------*/
118void
119watchdog_start(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/*---------------------------------------------------------------------------*/
129void
130watchdog_periodic(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/*---------------------------------------------------------------------------*/
139void
140watchdog_stop(void)
141{
142 counter++;
143 if(counter == 1) {
144 WDTCTL = WDTPW | WDTHOLD;
145 }
146}
147/*---------------------------------------------------------------------------*/
148void
149watchdog_reboot(void)
150{
151 WDTCTL = 0;
152}
153/*---------------------------------------------------------------------------*/
watchdog_reboot
void watchdog_reboot(void)
Keeps control until the WDT throws a reset signal.
Definition watchdog.c:94
watchdog_start
void watchdog_start(void)
Starts the WDT in watchdog mode if enabled by user configuration, maximum interval.
Definition watchdog.c:72
watchdog_periodic
void watchdog_periodic(void)
Writes the WDT clear sequence.
Definition watchdog.c:85
watchdog_init
void watchdog_init(void)
Initialisation function for the WDT.
Definition watchdog.c:63
watchdog_stop
void watchdog_stop(void)
Stops the WDT such that it won't timeout and cause MCU reset.
Definition watchdog.c:140