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/**
* \file
*
* \brief SAM Watchdog Driver
*
* Copyright (C) 2013-2015 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
*
*/
/*
* Support and FAQ: visit <a href="http://www.atmel.com/design-support/">Atmel Support</a>
*/
#include "wdt.h"
#include <system.h>
#include <system_interrupt.h>
wdt_callback_t wdt_early_warning_callback;
/**
* \brief Registers an asynchronous callback function with the driver.
*
* Registers an asynchronous callback with the WDT driver, fired when a
* given criteria (such as an Early Warning) is met. Callbacks are fired once
* for each event.
*
* \param[in] callback Pointer to the callback function to register
* \param[in] type Type of callback function to register
*
* \return Status of the registration operation.
* \retval STATUS_OK The callback was registered successfully
* \retval STATUS_ERR_INVALID_ARG If an invalid callback type was supplied
*/
enum status_code wdt_register_callback(
const wdt_callback_t callback,
const enum wdt_callback type)
{
/* Sanity check arguments */
Assert(callback);
switch (type)
{
case WDT_CALLBACK_EARLY_WARNING:
wdt_early_warning_callback = callback;
return STATUS_OK;
default:
Assert(false);
return STATUS_ERR_INVALID_ARG;
}
}
/**
* \brief Unregisters an asynchronous callback function with the driver.
*
* Unregisters an asynchronous callback with the WDT driver, removing it
* from the internal callback registration table.
*
* \param[in] type Type of callback function to unregister
*
* \return Status of the de-registration operation.
* \retval STATUS_OK The callback was Unregistered successfully
* \retval STATUS_ERR_INVALID_ARG If an invalid callback type was supplied
*/
enum status_code wdt_unregister_callback(
const enum wdt_callback type)
{
switch (type)
{
case WDT_CALLBACK_EARLY_WARNING:
wdt_early_warning_callback = NULL;
return STATUS_OK;
default:
Assert(false);
return STATUS_ERR_INVALID_ARG;
}
}
/**
* \brief Enables asynchronous callback generation for a given type.
*
* Enables asynchronous callbacks for a given callback type. This must be
* called before an external interrupt channel will generate callback events.
*
* \param[in] type Type of callback function to enable
*
* \return Status of the callback enable operation.
* \retval STATUS_OK The callback was enabled successfully
* \retval STATUS_ERR_INVALID_ARG If an invalid callback type was supplied
*/
enum status_code wdt_enable_callback(
const enum wdt_callback type)
{
Wdt *const WDT_module = WDT;
switch (type)
{
case WDT_CALLBACK_EARLY_WARNING:
WDT_module->INTENSET.reg = WDT_INTENSET_EW;
system_interrupt_enable(SYSTEM_INTERRUPT_MODULE_WDT);
return STATUS_OK;
default:
Assert(false);
return STATUS_ERR_INVALID_ARG;
}
}
/**
* \brief Disables asynchronous callback generation for a given type.
*
* Disables asynchronous callbacks for a given callback type.
*
* \param[in] type Type of callback function to disable
*
* \return Status of the callback disable operation.
* \retval STATUS_OK The callback was disabled successfully
* \retval STATUS_ERR_INVALID_ARG If an invalid callback type was supplied
*/
enum status_code wdt_disable_callback(
const enum wdt_callback type)
{
Wdt *const WDT_module = WDT;
switch (type)
{
case WDT_CALLBACK_EARLY_WARNING:
WDT_module->INTENCLR.reg = WDT_INTENCLR_EW;
return STATUS_OK;
default:
Assert(false);
return STATUS_ERR_INVALID_ARG;
}
}
/** Handler for the WDT hardware module interrupt. */
void WDT_Handler(void)
{
wdt_clear_early_warning();
if (wdt_early_warning_callback) {
wdt_early_warning_callback();
}
}
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