mirror of
https://github.com/stargieg/bacnet-stack
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104 lines
3.2 KiB
C
104 lines
3.2 KiB
C
/**************************************************************************
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*
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* Copyright (C) 2009 Steve Karg <skarg@users.sourceforge.net>
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*********************************************************************/
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#include "hardware.h"
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#include "watchdog.h"
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#if !defined(__GNUC__)
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static inline void wdt_enable(
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int value)
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{
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__disable_interrupt();
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__watchdog_reset();
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/* Start timed equence */
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WDTCSR |= (1 << WDCE) | (1 << WDE);
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/* Set new prescaler(time-out) value = 64K cycles (~0.5 s) */
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WDTCSR = (1 << WDE) | (value);
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/* we aren't ready to enable interrupts here
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__enable_interrupt(); */
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}
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static inline void wdt_disable(
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void)
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{
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__disable_interrupt();
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__watchdog_reset();
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/* Clear WDRF in MCUSR */
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MCUSR &= ~(1 << WDRF);
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/* Write logical one to WDCE and WDE */
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/* Keep old prescaler setting to prevent unintentional time-out */
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WDTCSR |= (1 << WDCE) | (1 << WDE);
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/* Turn off WDT */
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WDTCSR = 0x00;
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__enable_interrupt();
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}
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static inline void wdt_reset(
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void)
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{
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__watchdog_reset();
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}
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#endif
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/*************************************************************************
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* Description: Reset the watchdog timer
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* Returns: none
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* Notes: none
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**************************************************************************/
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void watchdog_reset(
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void)
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{
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wdt_reset();
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}
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/*************************************************************************
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* Description: Initialize the watchdog timer
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* Returns: none
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* Notes: none
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**************************************************************************/
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void watchdog_init(
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unsigned milliseconds)
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{
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unsigned value = WDTO_15MS;
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if (milliseconds) {
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if (milliseconds <= 15) {
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value = WDTO_15MS;
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} else if (milliseconds <= 30) {
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value = WDTO_30MS;
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} else if (milliseconds <= 60) {
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value = WDTO_60MS;
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} else if (milliseconds <= 120) {
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value = WDTO_120MS;
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} else if (milliseconds <= 500) {
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value = WDTO_500MS;
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} else if (milliseconds <= 1000) {
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value = WDTO_1S;
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} else {
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value = WDTO_2S;
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}
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wdt_enable(value);
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} else {
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wdt_disable();
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}
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}
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