kopia lustrzana https://github.com/micropython/micropython
84 wiersze
2.7 KiB
C
84 wiersze
2.7 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) 2016-2023 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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// This file is never compiled standalone, it's included directly from
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// extmod/machine_wdt.c via MICROPY_PY_MACHINE_WDT_INCLUDEFILE.
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#include "py/mphal.h"
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#if defined(STM32H7)
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#define IWDG (IWDG1)
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#endif
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typedef struct _machine_wdt_obj_t {
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mp_obj_base_t base;
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} machine_wdt_obj_t;
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static const machine_wdt_obj_t machine_wdt = {{&machine_wdt_type}};
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static machine_wdt_obj_t *mp_machine_wdt_make_new_instance(mp_int_t id, mp_int_t timeout_ms) {
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if (id != 0) {
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mp_raise_msg_varg(&mp_type_ValueError, MP_ERROR_TEXT("WDT(%d) doesn't exist"), id);
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}
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// compute prescaler
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int32_t timeout = timeout_ms;
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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(MP_ERROR_TEXT("WDT timeout too short"));
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} else if (timeout > 0xfff) {
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mp_raise_ValueError(MP_ERROR_TEXT("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 (machine_wdt_obj_t *)&machine_wdt;
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}
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static void mp_machine_wdt_feed(machine_wdt_obj_t *self) {
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(void)self;
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IWDG->KR = 0xaaaa;
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}
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