/**
 * \file
 *
 * \brief AVR XMEGA WatchDog Timer driver.
 *
 * Copyright (c) 2011 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 "compiler.h"
#include "ccp.h"
#include "wdt.h"

/*! \brief Set Watchdog timeout period.
 *
 *  This function sets the coded field of the WDT timeout period.
 *
 *  The function writes the correct signature to the Configuration
 *  Change Protection register before writing the CTRL register. Interrupts are
 *  automatically ignored during the change enable period. The function will
 *  wait for the WDT to be synchronized to the WDT clock domain before
 *  proceeding
 *
 *  \param  to_period  WDT timeout coded period
 */
void wdt_set_timeout_period(enum wdt_timeout_period_t to_period)
{
	uint8_t temp = (WDT_PER_gm & (to_period << WDT_PER_gp)) |
			(WDT.CTRL & WDT_ENABLE_bm) | (1 << WDT_CEN_bp);
	ccp_write_io((void *)&WDT.CTRL, temp);
	wdt_wait_while_busy();
}


/*! \brief Set Watchdog window period.
 *
 *  This function sets the coded field of the WDT closed window period.
 *  Note that this setting is available only if the WDT is enabled (hardware
 *  behaviour relayed by software).
 *
 *  The function writes the correct signature to the Configuration
 *  Change Protection register before writing the WINCTRL register. Interrupts
 *  are automatically ignored during the change enable period. The function will
 *  wait for the WDT to be synchronized to the WDT clock domain before
 *  proceeding
 *
 *  \param  win_period  Window coded period
 *
 *  \retval  true   The WDT was enabled and the setting is done.
 *           false  The WDT is disabled and the setting is discarded.
 */
bool wdt_set_window_period(enum wdt_window_period_t win_period)
{
	if (!(wdt_is_enabled())) {
		return false;
	}
	uint8_t temp = (WDT_WPER_gm & (win_period << WDT_WPER_gp)) |
			(WDT.WINCTRL & WDT_WEN_bm) | (1 << WDT_WCEN_bp);
	ccp_write_io((void *)&WDT.WINCTRL, temp);
	wdt_wait_while_busy();
	return true;
}


/*! \brief Disable Watchdog.
 *
 *  This function disables the WDT without changing period settings.
 *
 *  The function writes the correct signature to the Configuration
 *  Change Protection register before writing the CTRL register. Interrupts are
 *  automatically ignored during the change enable period. Disable functions
 *  operate asynchronously with immediate effect.
 */
void wdt_disable(void)
{
	uint8_t temp = (WDT.CTRL & ~WDT_ENABLE_bm) | (1 << WDT_CEN_bp);
	ccp_write_io((void *)&WDT.CTRL, temp);
}


/*! \brief Enable Watchdog.
 *
 *  This function enables the WDT without changing period settings.
 *
 *  The function writes the correct signature to the Configuration
 *  Change Protection register before writing the CTRL register. Interrupts are
 *  automatically ignored during the change enable period. The function will
 *  wait for the WDT to be synchronized to the WDT clock domain before
 *  proceeding
 */
void wdt_enable(void)
{
	uint8_t temp = (WDT.CTRL & WDT_PER_gm) |
			(1 << WDT_ENABLE_bp) | (1 << WDT_CEN_bp);
	ccp_write_io((void *)&WDT.CTRL, temp);
	wdt_wait_while_busy();
}


/*! \brief Disable Watchdog window mode without changing period settings.
 *
 *  This function disables the WDT window mode without changing period settings.
 *
 *  The function writes the correct signature to the Configuration
 *  Change Protection register before writing the WINCTRL register. Interrupts
 *  are automatically ignored during the change enable period. Disable functions
 *  operate asynchronously with immediate effect.
 *
 *  \retval  true   The WDT was enabled and the window mode is disabled.
 *           false  The WDT (& the window mode) is already disabled.
 */
bool wdt_disable_window_mode(void)
{
	if (!(wdt_is_enabled())) {
		return false;
	}
	uint8_t temp = (WDT.WINCTRL & ~WDT_WEN_bm) | (1 << WDT_WCEN_bp);
	ccp_write_io((void *)&WDT.WINCTRL, temp);

	return true;
}


/*! \brief Enable Watchdog window mode.
 *
 *  This function enables the WDT window mode without changing period settings.
 *
 *  The function writes the correct signature to the Configuration
 *  Change Protection register before writing the WINCTRL register. Interrupts
 *  are automatically ignored during the change enable period. The function will
 *  wait for the WDT to be synchronized to the WDT clock domain before
 *  proceeding
 *
 *  \retval  true   The WDT was enabled and the setting is done.
 *           false  The WDT is disabled and the setting is discarded.
 */
bool wdt_enable_window_mode(void)
{
	if (!(wdt_is_enabled())) {
		return false;
	}
	uint8_t temp = (WDT.WINCTRL & WDT_WPER_gm) |
			(1 << WDT_WEN_bp) | (1 << WDT_WCEN_bp);
	ccp_write_io((void *)&WDT.WINCTRL, temp);
	wdt_wait_while_busy();
	return true;
}


/*! \brief Reset MCU via Watchdog.
 *
 *  This function generates an hardware microcontroller reset using the WDT.
 *
 *  The function loads enables the WDT in window mode. Executing a "wdr" asm
 *  instruction when the windows is closed, provides a quick mcu reset.
 *
 */
void wdt_reset_mcu(void)
{
uint8_t temp;
	/*
	 * WDT enabled (minimum timeout period for max. security)
	 */
	temp = WDT_PER_8CLK_gc | (1 << WDT_ENABLE_bp) | (1 << WDT_CEN_bp);
	ccp_write_io((void *)&WDT.CTRL, temp);
	wdt_wait_while_busy();
	/*
	 * WDT enabled (maximum window period for max. security)
	 */
	temp = WDT_WPER_8KCLK_gc | (1 << WDT_WEN_bp) | (1 << WDT_WCEN_bp);
	ccp_write_io((void *)&WDT.WINCTRL, temp);
	wdt_wait_while_busy();
	/*
	 * WDT Reset during window => WDT generates an Hard Reset.
	 */
	wdt_reset();
	/*
	 * No exit to prevent the execution of the following instructions.
	 */
	while (true) {
		/* Wait for Watchdog reset. */
	}
}