265 lines
8.1 KiB
C
265 lines
8.1 KiB
C
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/**
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* \file
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*
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* \brief SAM Watchdog Driver
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*
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* Copyright (C) 2012-2016 Atmel Corporation. All rights reserved.
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*
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* \asf_license_start
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*
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* \page License
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* 3. The name of Atmel may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* 4. This software may only be redistributed and used in connection with an
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* Atmel microcontroller product.
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*
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* THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
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* EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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* \asf_license_stop
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*
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*/
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/*
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* Support and FAQ: visit <a href="http://www.atmel.com/design-support/">Atmel Support</a>
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*/
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#include "wdt.h"
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#include <system.h>
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/**
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* \brief Sets up the WDT hardware module based on the configuration.
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*
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* Writes a given configuration of a WDT configuration to the
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* hardware module, and initializes the internal device struct.
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*
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* \param[in] config Pointer to the configuration struct
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*
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* \return Status of the configuration procedure.
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*
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* \retval STATUS_OK If the module was configured correctly
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* \retval STATUS_ERR_INVALID_ARG If invalid argument(s) were supplied
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* \retval STATUS_ERR_IO If the Watchdog module is locked to be always on
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*/
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#if (SAML21) || (SAML22) || (SAMC20) || (SAMC21) || (SAMR30)
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enum status_code wdt_set_config(
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const struct wdt_conf *const config)
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{
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/* Sanity check arguments */
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Assert(config);
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Wdt *const WDT_module = WDT;
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/* Turn on the digital interface clock */
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system_apb_clock_set_mask(SYSTEM_CLOCK_APB_APBA, MCLK_APBAMASK_WDT);
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/* Check of the Watchdog has been locked to be always on, if so, abort */
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if (wdt_is_locked()) {
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return STATUS_ERR_IO;
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}
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/* Check for an invalid timeout period, abort if found */
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if (config->timeout_period == WDT_PERIOD_NONE) {
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return STATUS_ERR_INVALID_ARG;
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}
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/* Make sure the Window and Early Warning periods are not more than the
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* reset period, abort if either is invalid */
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if ((config->timeout_period < config->window_period) ||
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(config->timeout_period < config->early_warning_period)) {
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return STATUS_ERR_INVALID_ARG;
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}
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/* Disable the Watchdog module */
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WDT_module->CTRLA.reg &= ~WDT_CTRLA_ENABLE;
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while (wdt_is_syncing()) {
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/* Wait for all hardware modules to complete synchronization */
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}
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if(config->enable == false) {
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return STATUS_OK;
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}
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uint32_t new_config = 0;
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/* Update the timeout period value with the requested period */
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new_config |= (config->timeout_period - 1) << WDT_CONFIG_PER_Pos;
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/* Check if the user has requested a reset window period */
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if (config->window_period != WDT_PERIOD_NONE) {
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WDT_module->CTRLA.reg |= WDT_CTRLA_WEN;
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/* Update and enable the timeout period value */
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new_config |= (config->window_period - 1) << WDT_CONFIG_WINDOW_Pos;
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} else {
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/* Ensure the window enable control flag is cleared */
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WDT_module->CTRLA.reg &= ~WDT_CTRLA_WEN;
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}
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while (wdt_is_syncing()) {
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/* Wait for all hardware modules to complete synchronization */
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}
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/* Write the new Watchdog configuration */
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WDT_module->CONFIG.reg = new_config;
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/* Check if the user has requested an early warning period */
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if (config->early_warning_period != WDT_PERIOD_NONE) {
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/* Set the Early Warning period */
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WDT_module->EWCTRL.reg
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= (config->early_warning_period - 1) << WDT_EWCTRL_EWOFFSET_Pos;
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}
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/* Either enable or lock-enable the Watchdog timer depending on the user
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* settings */
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if (config->always_on) {
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WDT_module->CTRLA.reg |= WDT_CTRLA_ALWAYSON;
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} else {
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WDT_module->CTRLA.reg |= WDT_CTRLA_ENABLE;
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}
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while (wdt_is_syncing()) {
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/* Wait for all hardware modules to complete synchronization */
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}
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return STATUS_OK;
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}
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#else
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enum status_code wdt_set_config(
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const struct wdt_conf *const config)
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{
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/* Sanity check arguments */
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Assert(config);
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Wdt *const WDT_module = WDT;
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/* Turn on the digital interface clock */
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system_apb_clock_set_mask(SYSTEM_CLOCK_APB_APBA, PM_APBAMASK_WDT);
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/* Check of the Watchdog has been locked to be always on, if so, abort */
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if (wdt_is_locked()) {
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return STATUS_ERR_IO;
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}
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/* Check for an invalid timeout period, abort if found */
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if (config->timeout_period == WDT_PERIOD_NONE) {
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return STATUS_ERR_INVALID_ARG;
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}
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/* Make sure the Window and Early Warning periods are not more than the
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* reset period, abort if either is invalid */
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if ((config->timeout_period < config->window_period) ||
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(config->timeout_period < config->early_warning_period)) {
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return STATUS_ERR_INVALID_ARG;
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}
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/* Disable the Watchdog module */
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WDT_module->CTRL.reg &= ~WDT_CTRL_ENABLE;
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while (wdt_is_syncing()) {
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/* Wait for all hardware modules to complete synchronization */
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}
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if(config->enable == false) {
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return STATUS_OK;
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}
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/* Configure GCLK channel and enable clock */
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struct system_gclk_chan_config gclk_chan_conf;
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gclk_chan_conf.source_generator = config->clock_source;
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system_gclk_chan_set_config(WDT_GCLK_ID, &gclk_chan_conf);
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system_gclk_chan_enable(WDT_GCLK_ID);
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if (config->always_on) {
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system_gclk_chan_lock(WDT_GCLK_ID);
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}
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uint32_t new_config = 0;
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/* Update the timeout period value with the requested period */
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new_config |= (config->timeout_period - 1) << WDT_CONFIG_PER_Pos;
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/* Check if the user has requested a reset window period */
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if (config->window_period != WDT_PERIOD_NONE) {
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WDT_module->CTRL.reg |= WDT_CTRL_WEN;
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/* Update and enable the timeout period value */
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new_config |= (config->window_period - 1) << WDT_CONFIG_WINDOW_Pos;
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} else {
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/* Ensure the window enable control flag is cleared */
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WDT_module->CTRL.reg &= ~WDT_CTRL_WEN;
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}
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while (wdt_is_syncing()) {
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/* Wait for all hardware modules to complete synchronization */
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}
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/* Write the new Watchdog configuration */
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WDT_module->CONFIG.reg = new_config;
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/* Check if the user has requested an early warning period */
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if (config->early_warning_period != WDT_PERIOD_NONE) {
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while (wdt_is_syncing()) {
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/* Wait for all hardware modules to complete synchronization */
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}
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/* Set the Early Warning period */
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WDT_module->EWCTRL.reg
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= (config->early_warning_period - 1) << WDT_EWCTRL_EWOFFSET_Pos;
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}
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/* Either enable or lock-enable the Watchdog timer depending on the user
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* settings */
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if (config->always_on) {
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WDT_module->CTRL.reg |= WDT_CTRL_ALWAYSON;
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} else {
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WDT_module->CTRL.reg |= WDT_CTRL_ENABLE;
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}
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while (wdt_is_syncing()) {
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/* Wait for all hardware modules to complete synchronization */
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}
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return STATUS_OK;
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}
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#endif
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/**
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* \brief Resets the count of the running Watchdog Timer that was previously enabled.
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*
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* Resets the current count of the Watchdog Timer, restarting the timeout
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* period count elapsed. This function should be called after the window
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* period (if one was set in the module configuration) but before the timeout
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* period to prevent a reset of the system.
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*/
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void wdt_reset_count(void)
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{
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Wdt *const WDT_module = WDT;
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/* Disable the Watchdog module */
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WDT_module->CLEAR.reg = WDT_CLEAR_CLEAR_KEY;
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while (wdt_is_syncing()) {
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/* Wait for all hardware modules to complete synchronization */
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}
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}
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