| /* |
| * 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; |
| } |