63 lines
2.1 KiB
C
63 lines
2.1 KiB
C
/******************************************************************************
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* The MIT License
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*
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* Copyright (c) 2010 Michael Hope.
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy,
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* modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included 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
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*****************************************************************************/
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/**
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* @file libmaple/iwdg.c
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* @brief Independent watchdog (IWDG) support
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*/
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#include <libmaple/iwdg.h>
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/**
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* @brief Initialise and start the watchdog
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*
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* The prescaler and reload set the timeout. For example, a prescaler
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* of IWDG_PRE_32 divides the 40 kHz clock by 32 and gives roughly 1
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* ms per reload.
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*
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* @param prescaler Prescaler for the 40 kHz IWDG clock.
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* @param reload Independent watchdog counter reload value.
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*/
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void iwdg_init(iwdg_prescaler prescaler, uint16 reload) {
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IWDG_BASE->KR = IWDG_KR_UNLOCK;
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IWDG_BASE->PR = prescaler;
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IWDG_BASE->RLR = reload;
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/* Start things off */
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IWDG_BASE->KR = IWDG_KR_START;
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iwdg_feed();
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}
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/**
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* @brief Reset the IWDG counter.
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*
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* Calling this function will cause the IWDG counter to be reset to
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* its reload value.
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*/
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void iwdg_feed(void) {
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IWDG_BASE->KR = IWDG_KR_FEED;
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}
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