174 lines
5.6 KiB
C
174 lines
5.6 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_lptmr.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.lptmr"
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#endif
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/*******************************************************************************
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* Prototypes
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******************************************************************************/
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#if defined(LPTMR_CLOCKS)
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/*!
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* @brief Gets the instance from the base address to be used to gate or ungate the module clock
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*
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* @param base LPTMR peripheral base address
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*
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* @return The LPTMR instance
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*/
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static uint32_t LPTMR_GetInstance(LPTMR_Type *base);
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#endif /* LPTMR_CLOCKS */
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/*******************************************************************************
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* Variables
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******************************************************************************/
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#if defined(LPTMR_CLOCKS)
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/*! @brief Pointers to LPTMR bases for each instance. */
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static LPTMR_Type *const s_lptmrBases[] = LPTMR_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 LPTMR clocks for each instance. */
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static const clock_ip_name_t s_lptmrClocks[] = LPTMR_CLOCKS;
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#if defined(LPTMR_PERIPH_CLOCKS)
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/* Array of LPTMR functional clock name. */
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static const clock_ip_name_t s_lptmrPeriphClocks[] = LPTMR_PERIPH_CLOCKS;
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#endif
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#endif /* FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL */
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#endif /* LPTMR_CLOCKS */
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/*******************************************************************************
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* Code
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******************************************************************************/
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#if defined(LPTMR_CLOCKS)
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static uint32_t LPTMR_GetInstance(LPTMR_Type *base)
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{
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uint32_t instance;
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/* Find the instance index from base address mappings. */
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for (instance = 0; instance < ARRAY_SIZE(s_lptmrBases); instance++)
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{
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if (s_lptmrBases[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 < ARRAY_SIZE(s_lptmrBases));
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return instance;
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}
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#endif /* LPTMR_CLOCKS */
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/*!
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* brief Ungates the LPTMR clock and configures the peripheral for a basic operation.
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*
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* note This API should be called at the beginning of the application using the LPTMR driver.
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*
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* param base LPTMR peripheral base address
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* param config A pointer to the LPTMR configuration structure.
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*/
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void LPTMR_Init(LPTMR_Type *base, const lptmr_config_t *config)
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{
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assert(NULL != config);
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#if defined(LPTMR_CLOCKS)
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#if !(defined(FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) && FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL)
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uint32_t instance = LPTMR_GetInstance(base);
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/* Ungate the LPTMR clock*/
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CLOCK_EnableClock(s_lptmrClocks[instance]);
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#if defined(LPTMR_PERIPH_CLOCKS)
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CLOCK_EnableClock(s_lptmrPeriphClocks[instance]);
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#endif
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#endif /* FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL */
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#endif /* LPTMR_CLOCKS */
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/* Configure the timers operation mode and input pin setup */
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base->CSR = (LPTMR_CSR_TMS(config->timerMode) | LPTMR_CSR_TFC(config->enableFreeRunning) |
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LPTMR_CSR_TPP(config->pinPolarity) | LPTMR_CSR_TPS(config->pinSelect));
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/* Configure the prescale value and clock source */
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base->PSR = (LPTMR_PSR_PRESCALE(config->value) | LPTMR_PSR_PBYP(config->bypassPrescaler) |
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LPTMR_PSR_PCS(config->prescalerClockSource));
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}
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/*!
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* brief Gates the LPTMR clock.
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*
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* param base LPTMR peripheral base address
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*/
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void LPTMR_Deinit(LPTMR_Type *base)
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{
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/* Disable the LPTMR and reset the internal logic */
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base->CSR &= ~LPTMR_CSR_TEN_MASK;
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#if defined(LPTMR_CLOCKS)
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#if !(defined(FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) && FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL)
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uint32_t instance = LPTMR_GetInstance(base);
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/* Gate the LPTMR clock*/
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CLOCK_DisableClock(s_lptmrClocks[instance]);
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#if defined(LPTMR_PERIPH_CLOCKS)
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CLOCK_DisableClock(s_lptmrPeriphClocks[instance]);
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#endif
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#endif /* FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL */
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#endif /* LPTMR_CLOCKS */
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}
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/*!
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* brief Fills in the LPTMR configuration structure with default settings.
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*
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* The default values are as follows.
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* code
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* config->timerMode = kLPTMR_TimerModeTimeCounter;
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* config->pinSelect = kLPTMR_PinSelectInput_0;
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* config->pinPolarity = kLPTMR_PinPolarityActiveHigh;
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* config->enableFreeRunning = false;
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* config->bypassPrescaler = true;
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* config->prescalerClockSource = kLPTMR_PrescalerClock_1;
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* config->value = kLPTMR_Prescale_Glitch_0;
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* endcode
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* param config A pointer to the LPTMR configuration structure.
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*/
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void LPTMR_GetDefaultConfig(lptmr_config_t *config)
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{
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assert(NULL != config);
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/* Initializes the configure structure to zero. */
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(void)memset(config, 0, sizeof(*config));
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/* Use time counter mode */
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config->timerMode = kLPTMR_TimerModeTimeCounter;
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/* Use input 0 as source in pulse counter mode */
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config->pinSelect = kLPTMR_PinSelectInput_0;
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/* Pulse input pin polarity is active-high */
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config->pinPolarity = kLPTMR_PinPolarityActiveHigh;
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/* Counter resets whenever TCF flag is set */
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config->enableFreeRunning = false;
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/* Bypass the prescaler */
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config->bypassPrescaler = true;
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/* LPTMR clock source */
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#if !(defined(FSL_FEATURE_LPTMR_HAS_NO_PRESCALER_CLOCK_SOURCE_1_SUPPORT) && \
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FSL_FEATURE_LPTMR_HAS_NO_PRESCALER_CLOCK_SOURCE_1_SUPPORT)
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config->prescalerClockSource = kLPTMR_PrescalerClock_1;
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#else
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config->prescalerClockSource = kLPTMR_PrescalerClock_0;
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#endif /* FSL_FEATURE_LPTMR_HAS_NO_PRESCALER_CLOCK_SOURCE_1_SUPPORT */
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/* Divide the prescaler clock by 2 */
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config->value = kLPTMR_Prescale_Glitch_0;
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}
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