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/*
* Copyright (c) 2015, Freescale Semiconductor, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* o Redistributions of source code must retain the above copyright notice, this list
* of conditions and the following disclaimer.
*
* o Redistributions in binary form must reproduce the above copyright notice, this
* list of conditions and the following disclaimer in the documentation and/or
* other materials provided with the distribution.
*
* o Neither the name of Freescale Semiconductor, Inc. nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "fsl_lptmr.h"
/*******************************************************************************
* Prototypes
******************************************************************************/
/*!
* @brief Gets the instance from the base address to be used to gate or ungate the module clock
*
* @param base LPTMR peripheral base address
*
* @return The LPTMR instance
*/
static uint32_t LPTMR_GetInstance(LPTMR_Type *base);
/*******************************************************************************
* Variables
******************************************************************************/
/*! @brief Pointers to LPTMR bases for each instance. */
static LPTMR_Type *const s_lptmrBases[] = LPTMR_BASE_PTRS;
/*! @brief Pointers to LPTMR clocks for each instance. */
static const clock_ip_name_t s_lptmrClocks[] = LPTMR_CLOCKS;
/*******************************************************************************
* Code
******************************************************************************/
static uint32_t LPTMR_GetInstance(LPTMR_Type *base)
{
uint32_t instance;
/* Find the instance index from base address mappings. */
for (instance = 0; instance < FSL_FEATURE_SOC_LPTMR_COUNT; instance++)
{
if (s_lptmrBases[instance] == base)
{
break;
}
}
assert(instance < FSL_FEATURE_SOC_LPTMR_COUNT);
return instance;
}
void LPTMR_Init(LPTMR_Type *base, const lptmr_config_t *config)
{
assert(config);
/* Ungate the LPTMR clock*/
CLOCK_EnableClock(s_lptmrClocks[LPTMR_GetInstance(base)]);
/* Configure the timers operation mode and input pin setup */
base->CSR = (LPTMR_CSR_TMS(config->timerMode) | LPTMR_CSR_TFC(config->enableFreeRunning) |
LPTMR_CSR_TPP(config->pinPolarity) | LPTMR_CSR_TPS(config->pinSelect));
/* Configure the prescale value and clock source */
base->PSR = (LPTMR_PSR_PRESCALE(config->value) | LPTMR_PSR_PBYP(config->bypassPrescaler) |
LPTMR_PSR_PCS(config->prescalerClockSource));
}
void LPTMR_Deinit(LPTMR_Type *base)
{
/* Disable the LPTMR and reset the internal logic */
base->CSR &= ~LPTMR_CSR_TEN_MASK;
/* Gate the LPTMR clock*/
CLOCK_DisableClock(s_lptmrClocks[LPTMR_GetInstance(base)]);
}
void LPTMR_GetDefaultConfig(lptmr_config_t *config)
{
assert(config);
/* Use time counter mode */
config->timerMode = kLPTMR_TimerModeTimeCounter;
/* Use input 0 as source in pulse counter mode */
config->pinSelect = kLPTMR_PinSelectInput_0;
/* Pulse input pin polarity is active-high */
config->pinPolarity = kLPTMR_PinPolarityActiveHigh;
/* Counter resets whenever TCF flag is set */
config->enableFreeRunning = false;
/* Bypass the prescaler */
config->bypassPrescaler = true;
/* LPTMR clock source */
config->prescalerClockSource = kLPTMR_PrescalerClock_1;
/* Divide the prescaler clock by 2 */
config->value = kLPTMR_Prescale_Glitch_0;
}
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