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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 support
*/
#include "libmaple.h"
#include "iwdg.h"
#define IWDG_UNLOCK 0x5555
#define IWDG_START 0xCCCC
#define IWDG_FEED 0xAAAA
/**
* @brief Initialise and start the watchdog
*
* The prescaler and reload set the timeout. A prescaler of 3 divides
* the 40 kHz clock by 32 and gives roughly 1 ms per reload.
*/
void iwdg_init(uint8 prescaler, uint16 reload) {
__write(IWDG_KR, IWDG_UNLOCK);
__write(IWDG_PR, prescaler);
__write(IWDG_RLR, reload);
/* Start things off */
__write(IWDG_KR, IWDG_START);
__write(IWDG_KR, IWDG_FEED);
}
void iwdg_feed(void) {
__write(IWDG_KR, IWDG_FEED);
}
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