76c366df56
Usage:
import machine
wdt = machine.WDT(0, 5000) # 5 second timeout
wdt.feed()
Thanks to Moritz for the initial implementation.
103 lines
3.1 KiB
C
103 lines
3.1 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2016 Damien P. George
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies 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 included in
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* 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, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <stdio.h>
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#include STM32_HAL_H
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#include "py/runtime.h"
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#include "wdt.h"
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typedef struct _pyb_wdt_obj_t {
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mp_obj_base_t base;
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} pyb_wdt_obj_t;
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STATIC pyb_wdt_obj_t pyb_wdt = {{&pyb_wdt_type}};
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STATIC mp_obj_t pyb_wdt_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *args) {
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// check arguments
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mp_arg_check_num(n_args, n_kw, 2, 2, false);
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mp_int_t id = mp_obj_get_int(args[0]);
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if (id != 0) {
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nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "WDT(%d) does not exist", id));
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}
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// timeout is in milliseconds
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mp_int_t timeout = mp_obj_get_int(args[1]);
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// compute prescaler
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uint32_t prescaler;
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for (prescaler = 0; prescaler < 6 && timeout >= 512; ++prescaler, timeout /= 2) {
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}
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// convert milliseconds to ticks
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timeout *= 8; // 32kHz / 4 = 8 ticks per millisecond (approx)
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if (timeout <= 0) {
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mp_raise_ValueError("WDT timeout too short");
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} else if (timeout > 0xfff) {
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mp_raise_ValueError("WDT timeout too long");
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}
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timeout -= 1;
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// set the reload register
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while (IWDG->SR & 2) {
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}
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IWDG->KR = 0x5555;
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IWDG->RLR = timeout;
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// set the prescaler
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while (IWDG->SR & 1) {
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}
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IWDG->KR = 0x5555;
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IWDG->PR = prescaler;
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// start the watch dog
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IWDG->KR = 0xcccc;
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return (mp_obj_t)&pyb_wdt;
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}
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STATIC mp_obj_t pyb_wdt_feed(mp_obj_t self_in) {
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(void)self_in;
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IWDG->KR = 0xaaaa;
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return mp_const_none;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(pyb_wdt_feed_obj, pyb_wdt_feed);
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STATIC const mp_map_elem_t pyb_wdt_locals_dict_table[] = {
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{ MP_OBJ_NEW_QSTR(MP_QSTR_feed), (mp_obj_t)&pyb_wdt_feed_obj },
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};
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STATIC MP_DEFINE_CONST_DICT(pyb_wdt_locals_dict, pyb_wdt_locals_dict_table);
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const mp_obj_type_t pyb_wdt_type = {
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{ &mp_type_type },
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.name = MP_QSTR_WDT,
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.make_new = pyb_wdt_make_new,
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.locals_dict = (mp_obj_t)&pyb_wdt_locals_dict,
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};
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