204 lines
7.0 KiB
C
204 lines
7.0 KiB
C
/*
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* The Clear BSD License
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* Copyright (c) 2016, Freescale Semiconductor, Inc.
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* Copyright 2016-2017 NXP
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted (subject to the limitations in the disclaimer below) provided
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* that the following conditions are met:
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*
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* o Redistributions of source code must retain the above copyright notice, this list
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* of conditions and the following disclaimer.
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*
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* o Redistributions in binary form must reproduce the above copyright notice, this
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* list of conditions and the following disclaimer in the documentation and/or
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* other materials provided with the distribution.
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*
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* o Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE GRANTED BY THIS LICENSE.
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "fsl_wwdt.h"
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/* Component ID definition, used by tools. */
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#ifndef FSL_COMPONENT_ID
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#define FSL_COMPONENT_ID "platform.drivers.wwdt"
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#endif
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/*******************************************************************************
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* Prototypes
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******************************************************************************/
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/*!
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* @brief Gets the instance from the base address
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*
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* @param base WWDT peripheral base address
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*
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* @return The WWDT instance
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*/
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static uint32_t WWDT_GetInstance(WWDT_Type *base);
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/*******************************************************************************
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* Variables
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******************************************************************************/
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/*! @brief Pointers to WWDT bases for each instance. */
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static WWDT_Type *const s_wwdtBases[] = WWDT_BASE_PTRS;
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#if !(defined(FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) && FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL)
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/*! @brief Pointers to WWDT clocks for each instance. */
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static const clock_ip_name_t s_wwdtClocks[] = WWDT_CLOCKS;
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#endif /* FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL */
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#if !(defined(FSL_FEATURE_WWDT_HAS_NO_RESET) && FSL_FEATURE_WWDT_HAS_NO_RESET)
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/*! @brief Pointers to WWDT resets for each instance. */
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static const reset_ip_name_t s_wwdtResets[] = WWDT_RSTS;
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#endif
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/*******************************************************************************
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* Code
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******************************************************************************/
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static uint32_t WWDT_GetInstance(WWDT_Type *base)
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{
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uint32_t instance;
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uint32_t wwdtArrayCount = (sizeof(s_wwdtBases) / sizeof(s_wwdtBases[0]));
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/* Find the instance index from base address mappings. */
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for (instance = 0; instance < wwdtArrayCount; instance++)
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{
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if (s_wwdtBases[instance] == base)
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{
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break;
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}
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}
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assert(instance < wwdtArrayCount);
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return instance;
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}
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/*******************************************************************************
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* Code
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******************************************************************************/
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void WWDT_GetDefaultConfig(wwdt_config_t *config)
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{
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assert(config);
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/* Enable the watch dog */
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config->enableWwdt = true;
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/* Disable the watchdog timeout reset */
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config->enableWatchdogReset = false;
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/* Disable the watchdog protection for updating the timeout value */
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config->enableWatchdogProtect = false;
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/* Do not lock the watchdog oscillator */
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config->enableLockOscillator = false;
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/* Windowing is not in effect */
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config->windowValue = 0xFFFFFFU;
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/* Set the timeout value to the max */
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config->timeoutValue = 0xFFFFFFU;
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/* No warning is provided */
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config->warningValue = 0;
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}
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void WWDT_Init(WWDT_Type *base, const wwdt_config_t *config)
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{
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assert(config);
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uint32_t value = 0U;
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uint32_t timeDelay = 0U;
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uint32_t srcClock_Hz = 0U;
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#if defined(FSL_FEATURE_WWDT_HAS_LPOSC_CLOCK_SOURCE) && FSL_FEATURE_WWDT_HAS_LPOSC_CLOCK_SOURCE
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srcClock_Hz = CLOCK_GetFreq(kCLOCK_LPOsc);
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#else
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srcClock_Hz = CLOCK_GetFreq(kCLOCK_WdtOsc);
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#endif
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timeDelay = (SystemCoreClock / srcClock_Hz + 1) * 3;
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#if !(defined(FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) && FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL)
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/* Enable the WWDT clock */
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CLOCK_EnableClock(s_wwdtClocks[WWDT_GetInstance(base)]);
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#endif /* FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL */
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#if !(defined(FSL_FEATURE_WWDT_HAS_NO_RESET) && FSL_FEATURE_WWDT_HAS_NO_RESET)
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/* Reset the WWDT module */
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RESET_PeripheralReset(s_wwdtResets[WWDT_GetInstance(base)]);
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#endif
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value = WWDT_MOD_WDEN(config->enableWwdt) | WWDT_MOD_WDRESET(config->enableWatchdogReset) |
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WWDT_MOD_LOCK(config->enableLockOscillator);
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/* Set configruation */
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base->TC = WWDT_TC_COUNT(config->timeoutValue);
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base->MOD |= value;
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base->WINDOW = WWDT_WINDOW_WINDOW(config->windowValue);
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base->WARNINT = WWDT_WARNINT_WARNINT(config->warningValue);
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WWDT_Refresh(base);
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/* This WDPROTECT bit can be set once by software and is only cleared by a reset */
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if((base->MOD & WWDT_MOD_WDPROTECT_MASK) == 0U)
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{
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/* Set the WDPROTECT bit after the Feed Sequence (0xAA, 0x55) with 3 WDCLK delay */
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while (timeDelay--)
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{
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__NOP();
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}
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base->MOD |= WWDT_MOD_WDPROTECT(config->enableWatchdogProtect);
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}
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}
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void WWDT_Deinit(WWDT_Type *base)
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{
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WWDT_Disable(base);
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#if !(defined(FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) && FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL)
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/* Disable the WWDT clock */
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CLOCK_DisableClock(s_wwdtClocks[WWDT_GetInstance(base)]);
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#endif /* FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL */
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}
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void WWDT_Refresh(WWDT_Type *base)
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{
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uint32_t primaskValue = 0U;
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/* Disable the global interrupt to protect refresh sequence */
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primaskValue = DisableGlobalIRQ();
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base->FEED = WWDT_FIRST_WORD_OF_REFRESH;
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base->FEED = WWDT_SECOND_WORD_OF_REFRESH;
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EnableGlobalIRQ(primaskValue);
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}
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void WWDT_ClearStatusFlags(WWDT_Type *base, uint32_t mask)
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{
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/* Clear the WDINT bit so that we don't accidentally clear it */
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uint32_t reg = (base->MOD & (~WWDT_MOD_WDINT_MASK));
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/* Clear timeout by writing a zero */
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if (mask & kWWDT_TimeoutFlag)
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{
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reg &= ~WWDT_MOD_WDTOF_MASK;
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}
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/* Clear warning interrupt flag by writing a one */
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if (mask & kWWDT_WarningFlag)
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{
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reg |= WWDT_MOD_WDINT_MASK;
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}
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base->MOD = reg;
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}
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