1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
|
/******************************************************************************
* 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;
}
|
