141 lines
4.5 KiB
C
141 lines
4.5 KiB
C
/*
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* Copyright (c) 2015, 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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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include "fsl_ewm.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.ewm"
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#endif
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/*******************************************************************************
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* Code
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******************************************************************************/
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/*!
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* brief Initializes the EWM peripheral.
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*
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* This function is used to initialize the EWM. After calling, the EWM
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* runs immediately according to the configuration.
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* Note that, except for the interrupt enable control bit, other control bits and registers are write once after a
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* CPU reset. Modifying them more than once generates a bus transfer error.
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*
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* This is an example.
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* code
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* ewm_config_t config;
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* EWM_GetDefaultConfig(&config);
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* config.compareHighValue = 0xAAU;
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* EWM_Init(ewm_base,&config);
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* endcode
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*
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* param base EWM peripheral base address
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* param config The configuration of the EWM
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*/
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void EWM_Init(EWM_Type *base, const ewm_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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#if !((defined(FSL_FEATURE_SOC_PCC_COUNT) && FSL_FEATURE_SOC_PCC_COUNT) && \
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(defined(FSL_FEATURE_PCC_SUPPORT_EWM_CLOCK_REMOVE) && FSL_FEATURE_PCC_SUPPORT_EWM_CLOCK_REMOVE))
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#if !(defined(FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) && FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL)
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CLOCK_EnableClock(kCLOCK_Ewm0);
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#endif /* FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL */
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#endif
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value = EWM_CTRL_EWMEN(config->enableEwm) | EWM_CTRL_ASSIN(config->setInputAssertLogic) |
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EWM_CTRL_INEN(config->enableEwmInput) | EWM_CTRL_INTEN(config->enableInterrupt);
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#if defined(FSL_FEATURE_EWM_HAS_PRESCALER) && FSL_FEATURE_EWM_HAS_PRESCALER
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base->CLKPRESCALER = config->prescaler;
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#endif /* FSL_FEATURE_EWM_HAS_PRESCALER */
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#if defined(FSL_FEATURE_EWM_HAS_CLOCK_SELECT) && FSL_FEATURE_EWM_HAS_CLOCK_SELECT
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base->CLKCTRL = config->clockSource;
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#endif /* FSL_FEATURE_EWM_HAS_CLOCK_SELECT*/
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base->CMPL = config->compareLowValue;
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base->CMPH = config->compareHighValue;
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base->CTRL = value;
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}
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/*!
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* brief Deinitializes the EWM peripheral.
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*
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* This function is used to shut down the EWM.
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*
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* param base EWM peripheral base address
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*/
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void EWM_Deinit(EWM_Type *base)
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{
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EWM_DisableInterrupts(base, kEWM_InterruptEnable);
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#if !((defined(FSL_FEATURE_SOC_PCC_COUNT) && FSL_FEATURE_SOC_PCC_COUNT) && \
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(defined(FSL_FEATURE_PCC_SUPPORT_EWM_CLOCK_REMOVE) && FSL_FEATURE_PCC_SUPPORT_EWM_CLOCK_REMOVE))
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#if !(defined(FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) && FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL)
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CLOCK_DisableClock(kCLOCK_Ewm0);
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#endif /* FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL */
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#endif /* FSL_FEATURE_PCC_SUPPORT_EWM_CLOCK_REMOVE */
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}
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/*!
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* brief Initializes the EWM configuration structure.
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*
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* This function initializes the EWM configuration structure to default values. The default
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* values are as follows.
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* code
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* ewmConfig->enableEwm = true;
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* ewmConfig->enableEwmInput = false;
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* ewmConfig->setInputAssertLogic = false;
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* ewmConfig->enableInterrupt = false;
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* ewmConfig->ewm_lpo_clock_source_t = kEWM_LpoClockSource0;
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* ewmConfig->prescaler = 0;
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* ewmConfig->compareLowValue = 0;
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* ewmConfig->compareHighValue = 0xFEU;
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* endcode
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*
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* param config Pointer to the EWM configuration structure.
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* see ewm_config_t
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*/
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void EWM_GetDefaultConfig(ewm_config_t *config)
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{
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assert(config);
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/* Initializes the configure structure to zero. */
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memset(config, 0, sizeof(*config));
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config->enableEwm = true;
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config->enableEwmInput = false;
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config->setInputAssertLogic = false;
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config->enableInterrupt = false;
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#if defined(FSL_FEATURE_EWM_HAS_CLOCK_SELECT) && FSL_FEATURE_EWM_HAS_CLOCK_SELECT
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config->clockSource = kEWM_LpoClockSource0;
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#endif /* FSL_FEATURE_EWM_HAS_CLOCK_SELECT*/
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#if defined(FSL_FEATURE_EWM_HAS_PRESCALER) && FSL_FEATURE_EWM_HAS_PRESCALER
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config->prescaler = 0U;
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#endif /* FSL_FEATURE_EWM_HAS_PRESCALER */
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config->compareLowValue = 0U;
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config->compareHighValue = 0xFEU;
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}
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/*!
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* brief Services the EWM.
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*
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* This function resets the EWM counter to zero.
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*
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* param base EWM peripheral base address
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*/
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void EWM_Refresh(EWM_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->SERV = (uint8_t)0xB4U;
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base->SERV = (uint8_t)0x2CU;
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EnableGlobalIRQ(primaskValue);
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}
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