106 lines
3.9 KiB
C
106 lines
3.9 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) 2021 Jeff Epler for Adafruit Industries
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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 <math.h>
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#include "py/runtime.h"
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#include "shared-bindings/watchdog/__init__.h"
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#include "shared-bindings/watchdog/WatchDogTimer.h"
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#include "common-hal/watchdog/WatchDogTimer.h"
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#include "component/wdt.h"
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void common_hal_watchdog_feed(watchdog_watchdogtimer_obj_t *self) {
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WDT->CLEAR.reg = WDT_CLEAR_CLEAR_KEY;
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}
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void common_hal_watchdog_deinit(watchdog_watchdogtimer_obj_t *self) {
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if (self->mode == WATCHDOGMODE_RESET) {
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mp_raise_RuntimeError(translate("WatchDogTimer cannot be deinitialized once mode is set to RESET"));
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} else {
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self->mode = WATCHDOGMODE_NONE;
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}
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}
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mp_float_t common_hal_watchdog_get_timeout(watchdog_watchdogtimer_obj_t *self) {
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return self->timeout;
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}
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STATIC void setup_wdt(watchdog_watchdogtimer_obj_t *self, int setting) {
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OSC32KCTRL->OSCULP32K.bit.EN1K = 1; // Enable out 1K (for WDT)
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// disable watchdog for config
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WDT->CTRLA.reg = 0;
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while (WDT->SYNCBUSY.reg) { // Sync CTRL write
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}
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WDT->INTENCLR.reg = WDT_INTENCLR_EW; // Disable early warning interrupt
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WDT->CONFIG.bit.PER = setting; // Set period for chip reset
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WDT->CTRLA.bit.WEN = 0; // Disable window mode
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while (WDT->SYNCBUSY.reg) { // Sync CTRL write
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}
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common_hal_watchdog_feed(self); // Clear watchdog interval
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WDT->CTRLA.bit.ENABLE = 1; // Start watchdog now!
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while (WDT->SYNCBUSY.reg) {
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}
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}
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void common_hal_watchdog_set_timeout(watchdog_watchdogtimer_obj_t *self, mp_float_t new_timeout) {
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int wdt_cycles = (int)(new_timeout * 1024);
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if (wdt_cycles < 8) {
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wdt_cycles = 8;
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}
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if (wdt_cycles > 16384) {
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mp_raise_ValueError(translate("timeout duration exceeded the maximum supported value"));
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}
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// ceil(log2(n)) = 32 - __builtin_clz(n - 1) when n > 1 (if int is 32 bits)
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int log2_wdt_cycles = (sizeof(int) * CHAR_BIT) - __builtin_clz(wdt_cycles - 1);
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int setting = log2_wdt_cycles - 3; // CYC8_Val is 0
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float timeout = (8 << setting) / 1024.f;
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if (self->mode == WATCHDOGMODE_RESET) {
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setup_wdt(self, setting);
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}
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self->timeout = timeout;
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}
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watchdog_watchdogmode_t common_hal_watchdog_get_mode(watchdog_watchdogtimer_obj_t *self) {
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return self->mode;
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}
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void common_hal_watchdog_set_mode(watchdog_watchdogtimer_obj_t *self, watchdog_watchdogmode_t new_mode) {
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if (self->mode != new_mode) {
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if (new_mode == WATCHDOGMODE_RAISE) {
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mp_raise_NotImplementedError(translate("RAISE mode is not implemented"));
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} else if (new_mode == WATCHDOGMODE_NONE) {
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common_hal_watchdog_deinit(self);
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}
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self->mode = new_mode;
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common_hal_watchdog_set_timeout(self, self->timeout);
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}
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}
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