| /* ---------------------------------------------------------------------------- | |
| * SAM Software Package License | |
| * ---------------------------------------------------------------------------- | |
| * Copyright (c) 2015, 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 | |
| * \section Purpose | |
| * 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. | |
| * | |
| * \section Usage | |
| * 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 "peripherals/pmc.h" | |
| #include "peripherals/wdt.h" | |
| #include <stdio.h> | |
| /*---------------------------------------------------------------------------- | |
| * Local functions | |
| *----------------------------------------------------------------------------*/ | |
| static uint32_t _wdt_compute_period(uint32_t period) | |
| { | |
| uint32_t value = period * (pmc_get_slow_clock() >> 7) / 1000; | |
| if (value > 0xfff) | |
| value = 0xfff; | |
| return value; | |
| } | |
| /*---------------------------------------------------------------------------- | |
| * Exported functions | |
| *----------------------------------------------------------------------------*/ | |
| void wdt_enable(uint32_t mode, uint32_t delta, uint32_t counter) | |
| { | |
| WDT->WDT_MR = (mode & ~(WDT_MR_WDDIS | WDT_MR_WDD_Msk | WDT_MR_WDV_Msk)) | | |
| WDT_MR_WDD(_wdt_compute_period(delta)) | | |
| WDT_MR_WDV(_wdt_compute_period(counter)); | |
| } | |
| void wdt_disable(void) | |
| { | |
| WDT->WDT_MR = WDT_MR_WDDIS; | |
| } | |
| void wdt_restart() | |
| { | |
| WDT->WDT_CR = WDT_CR_KEY_PASSWD | WDT_CR_WDRSTT; | |
| } | |
| uint32_t wdt_get_status(void) | |
| { | |
| return WDT->WDT_SR & (WDT_SR_WDUNF | WDT_SR_WDERR); | |
| } | |
| uint32_t wdt_get_counter_value(void) | |
| { | |
| return (WDT->WDT_MR & WDT_MR_WDV_Msk) >> WDT_MR_WDV_Pos; | |
| } | |