Watchdog on nRF?

cchoi22915 I’ll try to do a live session on this. It’s straight forward though, especially on the nRF52/91

/*
 * Copyright (c) 2021 Circuit Dojo LLC
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#include <drivers/watchdog.h>
#include <watchdog.h>

#include <logging/log.h>
LOG_MODULE_REGISTER(app_watchdog);

static const struct device *wdt = DEVICE_DT_GET(DT_NODELABEL(wdt0));

static int wdt_channel_id;

int app_watchdog_setup()
{

	int err;

	if (!device_is_ready(wdt) || wdt == NULL)
	{
		LOG_WRN("Watchdog not ready");
		return -EIO;
	}

	struct wdt_timeout_cfg wdt_config = {
	    /* Reset SoC when watchdog timer expires. */
	    .flags = WDT_FLAG_RESET_SOC,

	    /* Expire watchdog after max window */
	    .window.min = 0U,
	    .window.max = WDT_MAX_WINDOW};

	wdt_channel_id = wdt_install_timeout(wdt, &wdt_config);
	if (wdt_channel_id < 0)
	{
		LOG_ERR("Watchdog install error.");
		return wdt_channel_id;
	}

	err = wdt_setup(wdt, WDT_OPT_PAUSE_HALTED_BY_DBG);
	if (err)
	{
		LOG_ERR("Watchdog setup error");
		return err;
	}

	return 0;
}

void app_watchdog_feed()
{
	wdt_feed(wdt, wdt_channel_id);
}

First you set it up and then you feed it on whatever interval. That WDT_MAX_WINDOW sets the timeout in milliseconds. Make sure that wdt0 in your device overlay is set to status = "okay";