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86 lines
2.2 KiB
C
86 lines
2.2 KiB
C
/*
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* Copyright (C) 2015 PHYTEC Messtechnik GmbH
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* Copyright (C) 2015 Eistec AB
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*
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* This file is subject to the terms and conditions of the GNU Lesser General
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* Public License v2.1. See the file LICENSE in the top level directory for more
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* details.
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*/
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/**
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* @ingroup cpu_kinetis
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* @ingroup cpu_kinetis_wdog
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*
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* @{
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*
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* @file
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* @brief Low-level WDOG driver implementation
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*
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* @author Johann Fischer <j.fischer@phytec.de>
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* @author Joakim Nohlgård <joakim.nohlgard@eistec.se>
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*
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* @}
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*/
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#include <stdint.h>
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#include "wdog.h"
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#include "cpu_conf.h"
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#include "periph_conf.h"
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/**
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* Attempts to determine the type of the WDOG,
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* using the WDOG_STCTRLH_CLKSRC_MASK field.
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*/
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#ifndef KINETIS_WDOG_ADVANCED_MK
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#ifdef WDOG_STCTRLH_CLKSRC_MASK
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# define KINETIS_WDOG_ADVANCED_MK 1
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#endif
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#endif
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#ifndef KINETIS_WDOG_ADVANCED_EA
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#ifdef WDOG_CS1_STOP_MASK
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# define KINETIS_WDOG_ADVANCED_EA 1
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#endif
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#endif
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/**
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* @brief Disable hardware watchdog.
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*
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* For advanced WDOG (mostly Kinetis MCUs with Cortex-M4 inside):
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* The following unlock sequence must be completed within 256 bus cycles or
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* the watchdog will reset the system. The watchdog is enabled by default at
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* power on.
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*
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* The sequence is:
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* 1. Write 0xC520 to the unlock register
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* 2. Write 0xD928 to the unlock register
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*
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* Watchdog is now unlocked to allow us to change its settings
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*
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* 3. Clear the WDOGEN bit of the WDOG_STCTRLH register to completely disable
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* the watchdog.
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*
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* It is now possible to single step through the code without the watchdog
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* resetting the system.
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*
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* TODO: Only disable watchdog on debug builds.
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*/
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void wdog_disable(void)
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{
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#if KINETIS_WDOG_ADVANCED_MK
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/* unlock and disable the WDOG */
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WDOG->UNLOCK = (uint16_t)0xc520;
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WDOG->UNLOCK = (uint16_t)0xd928;
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WDOG->STCTRLH = (uint16_t)(WDOG_STCTRLH_WAITEN_MASK
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| WDOG_STCTRLH_STOPEN_MASK
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| WDOG_STCTRLH_ALLOWUPDATE_MASK
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| WDOG_STCTRLH_CLKSRC_MASK);
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#elif KINETIS_WDOG_ADVANCED_EA
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extern void SystemDisableWatchdog(void);
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SystemDisableWatchdog();
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#else
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/* disable the COP WDOG */
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SIM->COPC = (uint32_t)0x00u;
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#endif
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}
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