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/******************************************************************************
* The MIT License
*
* Copyright (c) 2010 Michael Hope.
*
* 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.
*****************************************************************************/
/**
* @file iwdg.c
* @brief Independent watchdog (IWDG) support
*/
#include "iwdg.h"
/**
* @brief Initialise and start the watchdog
*
* The prescaler and reload set the timeout. For example, a prescaler
* of IWDG_PRE_32 divides the 40 kHz clock by 32 and gives roughly 1
* ms per reload.
*
* @param prescaler Prescaler for the 40 kHz IWDG clock.
* @param reload Independent watchdog counter reload value.
*/
void iwdg_init(iwdg_prescaler prescaler, uint16 reload) {
IWDG_BASE->KR = IWDG_KR_UNLOCK;
IWDG_BASE->PR = prescaler;
IWDG_BASE->RLR = reload;
/* Start things off */
IWDG_BASE->KR = IWDG_KR_START;
iwdg_feed();
}
/**
* @brief Reset the IWDG counter.
*
* Calling this function will cause the IWDG counter to be reset to
* its reload value.
*/
void iwdg_feed(void) {
IWDG_BASE->KR = IWDG_KR_FEED;
}
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