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watchdog.c
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watchdog.c
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/*####COPYRIGHTBEGIN####
---------------------------------------------------------------
Copyright (C) 2010 Steve Karg <skarg@users.sourceforge.net>
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
---------------------------------------------------------------
####COPYRIGHTEND####*/
#include "hardware.h"
#include "watchdog.h"
#if defined(__ICCAVR__)
#include <intrinsics.h>
static inline void wdt_enable(
int value)
{
__disable_interrupt();
__watchdog_reset();
/* Start timed equence */
WDTCSR |= (1 << WDCE) | (1 << WDE);
/* Set new prescaler(time-out) value = 64K cycles (~0.5 s) */
WDTCSR = (1 << WDE) | (value);
/* we aren't ready to enable interrupts here
__enable_interrupt(); */
}
static inline void wdt_disable(
void)
{
__disable_interrupt();
__watchdog_reset();
/* Clear WDRF in MCUSR */
MCUSR &= ~(1 << WDRF);
/* Write logical one to WDCE and WDE */
/* Keep old prescaler setting to prevent unintentional time-out */
WDTCSR |= (1 << WDCE) | (1 << WDE);
/* Turn off WDT */
WDTCSR = 0x00;
__enable_interrupt();
}
static inline wdt_reset(
void)
{
__watchdog_reset();
}
#endif
/*************************************************************************
* Description: Reset the watchdog timer
* Returns: none
* Notes: none
**************************************************************************/
void watchdog_reset(
void)
{
wdt_reset();
}
/*************************************************************************
* Description: Initialize the watchdog timer
* Returns: none
* Notes: none
**************************************************************************/
void watchdog_init(
unsigned milliseconds)
{
unsigned value = WDTO_15MS;
if (milliseconds) {
if (milliseconds <= 15) {
value = WDTO_15MS;
} else if (milliseconds <= 30) {
value = WDTO_30MS;
} else if (milliseconds <= 60) {
value = WDTO_60MS;
} else if (milliseconds <= 120) {
value = WDTO_120MS;
} else if (milliseconds <= 500) {
value = WDTO_500MS;
} else if (milliseconds <= 1000) {
value = WDTO_1S;
} else {
value = WDTO_2S;
}
wdt_enable(value);
} else {
wdt_disable();
}
}