/**
 * \file
 *
 * \brief SAM D20 Watchdog Driver Callback Quick Start
 *
 * Copyright (C) 2012-2013 Atmel Corporation. All rights reserved.
 *
 * \asf_license_start
 *
 * \page License
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * 3. The name of Atmel may not be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * 4. This software may only be redistributed and used in connection with an
 *    Atmel microcontroller product.
 *
 * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
 * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 * \asf_license_stop
 *
 */
#include <asf.h>

void watchdog_early_warning_callback(void);
void configure_wdt(void);
void configure_wdt_callbacks(void);

//! [setup]
void watchdog_early_warning_callback(void)
{
	port_pin_set_output_level(LED_0_PIN, LED_0_ACTIVE);
}

void configure_wdt(void)
{
	/* Create a new configuration structure for the Watchdog settings and fill
	 * with the default module settings. */
	//! [setup_1]
	struct wdt_conf config_wdt;
	//! [setup_1]
	//! [setup_2]
	wdt_get_config_defaults(&config_wdt);
	//! [setup_2]

	/* Set the Watchdog configuration settings */
	//! [setup_3]
	config_wdt.always_on            = false;
	config_wdt.clock_source         = GCLK_GENERATOR_4;
	config_wdt.timeout_period       = WDT_PERIOD_4096CLK;
	config_wdt.early_warning_period = WDT_PERIOD_2048CLK;
	//! [setup_3]

	/* Initialize and enable the Watchdog with the user settings */
	//! [setup_4]
	wdt_init(&config_wdt);
	//! [setup_4]
	//! [setup_5]
	wdt_enable();
	//! [setup_5]
}

void configure_wdt_callbacks(void)
{
	//! [setup_6]
	wdt_register_callback(watchdog_early_warning_callback,
		WDT_CALLBACK_EARLY_WARNING);
	//! [setup_6]

	//! [setup_7]
	wdt_enable_callback(WDT_CALLBACK_EARLY_WARNING);
	//! [setup_7]
}
//! [setup]

int main(void)
{
	system_init();

	//! [setup_init]
	configure_wdt();
	configure_wdt_callbacks();
	//! [setup_init]

//! [main]
//! [main_1]
	port_pin_set_output_level(LED_0_PIN, LED_0_INACTIVE);
//! [main_1]

//! [main_2]
	system_interrupt_enable_global();
//! [main_2]

	//! [main_3]
	while (true) {
		/* Wait for callback */
	}
	//! [main_3]
//! [main]
}
