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Diffstat (limited to 'bsps/arm/atsam/contrib/libraries/libchip/source/wdt.c')
| -rw-r--r-- | bsps/arm/atsam/contrib/libraries/libchip/source/wdt.c | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/bsps/arm/atsam/contrib/libraries/libchip/source/wdt.c b/bsps/arm/atsam/contrib/libraries/libchip/source/wdt.c new file mode 100644 index 0000000000..e0ced522e2 --- /dev/null +++ b/bsps/arm/atsam/contrib/libraries/libchip/source/wdt.c @@ -0,0 +1,133 @@ +/* ---------------------------------------------------------------------------- */ +/* Atmel Microcontroller Software Support */ +/* 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 condition is 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); +} |