| /* ---------------------------------------------------------------------------- | |
| * SAM Software Package License | |
| * ---------------------------------------------------------------------------- | |
| * Copyright (c) 2012, Atmel Corporation | |
| * | |
| * All rights reserved. | |
| * | |
| * Redistribution and use in source and binary forms, with or without | |
| * modification, are permitted provided that the following conditions are met: | |
| * | |
| * - Redistributions of source code must retain the above copyright notice, | |
| * this list of conditions and the disclaimer below. | |
| * | |
| * Atmel's name may not be used to endorse or promote products derived from | |
| * this software without specific prior written permission. | |
| * | |
| * DISCLAIMER: 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 | |
| * 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. | |
| * ---------------------------------------------------------------------------- | |
| */ | |
| /** | |
| * \file | |
| * | |
| * Implementation of Watchdog Timer (WDT) controller. | |
| * | |
| */ | |
| /** \addtogroup wdt_module Working with WDT | |
| * \ingroup peripherals_module | |
| * The WDT driver provides the interface to configure and use the WDT | |
| * peripheral. | |
| * | |
| * The WDT can be used to prevent system lock-up if the software becomes | |
| * trapped in a deadlock. It can generate a general reset or a processor | |
| * reset only. It is clocked by slow clock divided by 128. | |
| * | |
| * The WDT is running at reset with 16 seconds watchdog period (slow clock at | |
| * 32.768 kHz) | |
| * and external reset generation enabled. The user must either disable it or | |
| * reprogram it to meet the application requires. | |
| * | |
| * To use the WDT, the user could follow these few steps: | |
| * <ul> | |
| * <li>Enable watchdog with given mode using \ref WDT_Enable(). | |
| * <li>Restart the watchdog using \ref WDT_Restart() within the watchdog period. | |
| * </ul> | |
| * | |
| * For more accurate information, please look at the WDT section of the | |
| * Datasheet. | |
| * | |
| * \note | |
| * The Watchdog Mode Register (WDT_MR) can be written only once.\n | |
| * | |
| * Related files :\n | |
| * \ref wdt.c\n | |
| * \ref wdt.h.\n | |
| */ | |
| /*@{*/ | |
| /*@}*/ | |
| /*--------------------------------------------------------------------------- | |
| * Headers | |
| *---------------------------------------------------------------------------*/ | |
| #include "chip.h" | |
| #include <stdint.h> | |
| /*---------------------------------------------------------------------------- | |
| * Exported functions | |
| *----------------------------------------------------------------------------*/ | |
| /** | |
| * \brief Enable watchdog with given mode. | |
| * | |
| * \note The Watchdog Mode Register (WDT_MR) can be written only once. | |
| * Only a processor reset resets it. | |
| * | |
| * \param dwMode WDT mode to be set | |
| */ | |
| extern void WDT_Enable( Wdt* pWDT, uint32_t dwMode ) | |
| { | |
| pWDT->WDT_MR = dwMode ; | |
| } | |
| /** | |
| * \brief Disable watchdog. | |
| * | |
| * \note The Watchdog Mode Register (WDT_MR) can be written only once. | |
| * Only a processor reset resets it. | |
| */ | |
| extern void WDT_Disable( Wdt* pWDT ) | |
| { | |
| pWDT->WDT_MR = WDT_MR_WDDIS; | |
| } | |
| /** | |
| * \brief Watchdog restart. | |
| */ | |
| extern void WDT_Restart( Wdt* pWDT ) | |
| { | |
| pWDT->WDT_CR = 0xA5000001; | |
| } | |
| /** | |
| * \brief Watchdog get status. | |
| */ | |
| extern uint32_t WDT_GetStatus( Wdt* pWDT ) | |
| { | |
| return (pWDT->WDT_SR & 0x3) ; | |
| } | |
| /** | |
| * \brief Watchdog get period. | |
| * | |
| * \param dwMs desired watchdog period in millisecond. | |
| */ | |
| extern uint32_t WDT_GetPeriod( uint32_t dwMs ) | |
| { | |
| if ( (dwMs < 4) || (dwMs > 16000) ) { | |
| return 0 ; | |
| } | |
| return ((dwMs << 8) / 1000) ; | |
| } |