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/*
* Copyright (c) 2015, Freescale Semiconductor, Inc.
* Copyright 2016-2017, 2020 NXP
* All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include "fsl_ewm.h"
/* Component ID definition, used by tools. */
#ifndef FSL_COMPONENT_ID
#define FSL_COMPONENT_ID "platform.drivers.ewm"
#endif
/*******************************************************************************
* Code
******************************************************************************/
/*!
* brief Initializes the EWM peripheral.
*
* This function is used to initialize the EWM. After calling, the EWM
* runs immediately according to the configuration.
* Note that, except for the interrupt enable control bit, other control bits and registers are write once after a
* CPU reset. Modifying them more than once generates a bus transfer error.
*
* This is an example.
* code
* ewm_config_t config;
* EWM_GetDefaultConfig(&config);
* config.compareHighValue = 0xAAU;
* EWM_Init(ewm_base,&config);
* endcode
*
* param base EWM peripheral base address
* param config The configuration of the EWM
*/
void EWM_Init(EWM_Type *base, const ewm_config_t *config)
{
assert(NULL != config);
uint8_t value = 0U;
#if !((defined(FSL_FEATURE_SOC_PCC_COUNT) && FSL_FEATURE_SOC_PCC_COUNT) && \
(defined(FSL_FEATURE_PCC_SUPPORT_EWM_CLOCK_REMOVE) && FSL_FEATURE_PCC_SUPPORT_EWM_CLOCK_REMOVE))
#if !(defined(FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) && FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL)
CLOCK_EnableClock(kCLOCK_Ewm0);
#endif /* FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL */
#endif
value = EWM_CTRL_EWMEN(config->enableEwm) | EWM_CTRL_ASSIN(config->setInputAssertLogic) |
EWM_CTRL_INEN(config->enableEwmInput) | EWM_CTRL_INTEN(config->enableInterrupt);
#if defined(FSL_FEATURE_EWM_HAS_PRESCALER) && FSL_FEATURE_EWM_HAS_PRESCALER
base->CLKPRESCALER = config->prescaler;
#endif /* FSL_FEATURE_EWM_HAS_PRESCALER */
#if defined(FSL_FEATURE_EWM_HAS_CLOCK_SELECT) && FSL_FEATURE_EWM_HAS_CLOCK_SELECT
base->CLKCTRL = (uint8_t)config->clockSource;
#endif /* FSL_FEATURE_EWM_HAS_CLOCK_SELECT*/
base->CMPL = config->compareLowValue;
base->CMPH = config->compareHighValue;
base->CTRL = value;
}
/*!
* brief Deinitializes the EWM peripheral.
*
* This function is used to shut down the EWM.
*
* param base EWM peripheral base address
*/
void EWM_Deinit(EWM_Type *base)
{
EWM_DisableInterrupts(base, (uint32_t)kEWM_InterruptEnable);
#if !((defined(FSL_FEATURE_SOC_PCC_COUNT) && FSL_FEATURE_SOC_PCC_COUNT) && \
(defined(FSL_FEATURE_PCC_SUPPORT_EWM_CLOCK_REMOVE) && FSL_FEATURE_PCC_SUPPORT_EWM_CLOCK_REMOVE))
#if !(defined(FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) && FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL)
CLOCK_DisableClock(kCLOCK_Ewm0);
#endif /* FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL */
#endif /* FSL_FEATURE_PCC_SUPPORT_EWM_CLOCK_REMOVE */
}
/*!
* brief Initializes the EWM configuration structure.
*
* This function initializes the EWM configuration structure to default values. The default
* values are as follows.
* code
* ewmConfig->enableEwm = true;
* ewmConfig->enableEwmInput = false;
* ewmConfig->setInputAssertLogic = false;
* ewmConfig->enableInterrupt = false;
* ewmConfig->ewm_lpo_clock_source_t = kEWM_LpoClockSource0;
* ewmConfig->prescaler = 0;
* ewmConfig->compareLowValue = 0;
* ewmConfig->compareHighValue = 0xFEU;
* endcode
*
* param config Pointer to the EWM configuration structure.
* see ewm_config_t
*/
void EWM_GetDefaultConfig(ewm_config_t *config)
{
assert(NULL != config);
/* Initializes the configure structure to zero. */
(void)memset(config, 0, sizeof(*config));
config->enableEwm = true;
config->enableEwmInput = false;
config->setInputAssertLogic = false;
config->enableInterrupt = false;
#if defined(FSL_FEATURE_EWM_HAS_CLOCK_SELECT) && FSL_FEATURE_EWM_HAS_CLOCK_SELECT
config->clockSource = kEWM_LpoClockSource0;
#endif /* FSL_FEATURE_EWM_HAS_CLOCK_SELECT*/
#if defined(FSL_FEATURE_EWM_HAS_PRESCALER) && FSL_FEATURE_EWM_HAS_PRESCALER
config->prescaler = 0U;
#endif /* FSL_FEATURE_EWM_HAS_PRESCALER */
config->compareLowValue = 0U;
config->compareHighValue = 0xFEU;
}
/*!
* brief Services the EWM.
*
* This function resets the EWM counter to zero.
*
* param base EWM peripheral base address
*/
void EWM_Refresh(EWM_Type *base)
{
uint32_t primaskValue = 0U;
/* Disable the global interrupt to protect refresh sequence */
primaskValue = DisableGlobalIRQ();
base->SERV = (uint8_t)0xB4U;
base->SERV = (uint8_t)0x2CU;
EnableGlobalIRQ(primaskValue);
}
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