kopia lustrzana https://github.com/micropython/micropython
117 wiersze
3.6 KiB
C
117 wiersze
3.6 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) 2020-2021 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 "sam.h"
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#define MIN_TIMEOUT 512
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#define MAX_TIMEOUT 16384
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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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// Calculate the floor value of log2(n)
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mp_int_t log2i(mp_int_t num) {
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mp_int_t res = 0;
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for (; num > 1; num >>= 1) {
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res += 1;
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}
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return res;
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}
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static const machine_wdt_obj_t machine_wdt = {{&machine_wdt_type}};
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static void set_timeout(uint32_t timeout) {
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// Set new timeout. Have to disable WDT first.
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// Confine to the valid range
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if (timeout < MIN_TIMEOUT) {
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timeout = MIN_TIMEOUT;
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} else if (timeout > MAX_TIMEOUT) {
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timeout = MAX_TIMEOUT;
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}
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#if defined(MCU_SAMD21)
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WDT->CTRL.reg = 0;
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while (WDT->STATUS.reg & WDT_STATUS_SYNCBUSY) {
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}
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WDT->CONFIG.reg = log2i(timeout) - 3;
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WDT->CTRL.reg = WDT_CTRL_ENABLE;
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while (WDT->STATUS.reg & WDT_STATUS_SYNCBUSY) {
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}
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#elif defined(MCU_SAMD51)
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WDT->CTRLA.reg = 0;
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while (WDT->SYNCBUSY.reg & WDT_SYNCBUSY_ENABLE) {
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}
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WDT->CONFIG.reg = log2i(timeout) - 3;
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WDT->CTRLA.reg = WDT_CTRLA_ENABLE;
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while (WDT->SYNCBUSY.reg & WDT_SYNCBUSY_ENABLE) {
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}
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#endif
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}
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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 defined(MCU_SAMD51)
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// Verify the WDT id. SAMD51 only, saving a few bytes for SAMD21
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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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#endif
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// Start the watchdog (timeout is in milliseconds).
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// Configure the WDT
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#if defined(MCU_SAMD21)
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// Enable APBx clocks and GCLK clock
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PM->APBAMASK.reg |= PM_APBAMASK_WDT;
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GCLK->CLKCTRL.reg = GCLK_CLKCTRL_CLKEN | GCLK_CLKCTRL_GEN_GCLK8 | GCLK_CLKCTRL_ID_WDT;
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#elif defined(MCU_SAMD51)
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// Enable APBx clocks and 1kHz clock
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MCLK->APBAMASK.reg |= MCLK_APBAMASK_WDT;
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OSC32KCTRL->OSCULP32K.bit.EN1K = 1;
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#endif
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set_timeout(timeout_ms);
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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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WDT->CLEAR.reg = 0xa5;
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}
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static void mp_machine_wdt_timeout_ms_set(machine_wdt_obj_t *self, mp_int_t timeout_ms) {
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(void)self;
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set_timeout(timeout_ms);
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}
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