| /* ---------------------------------------------------------------------------- |
| * SAM Software Package License |
| * ---------------------------------------------------------------------------- |
| * Copyright (c) 2011, 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 |
| * 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) ; |
| } |