Johannes Stratmann / mbed-dev

added prescaler for 16 bit pwm in LPC1347 target

Fork of mbed-dev by mbed official

targets/hal/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_K66F/drivers/fsl_lptmr.c@144:ef7eb2e8f9f7, 2016-09-02 (annotated)

Committer:
<>
Date:
Fri Sep 02 15:07:44 2016 +0100
Revision:
144:ef7eb2e8f9f7
This updates the lib to the mbed lib v125

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 144:ef7eb2e8f9f7 1 /*
<> 144:ef7eb2e8f9f7 2 * Copyright (c) 2015, Freescale Semiconductor, Inc.
<> 144:ef7eb2e8f9f7 3 * All rights reserved.
<> 144:ef7eb2e8f9f7 4 *
<> 144:ef7eb2e8f9f7 5 * Redistribution and use in source and binary forms, with or without modification,
<> 144:ef7eb2e8f9f7 6 * are permitted provided that the following conditions are met:
<> 144:ef7eb2e8f9f7 7 *
<> 144:ef7eb2e8f9f7 8 * o Redistributions of source code must retain the above copyright notice, this list
<> 144:ef7eb2e8f9f7 9 * of conditions and the following disclaimer.
<> 144:ef7eb2e8f9f7 10 *
<> 144:ef7eb2e8f9f7 11 * o Redistributions in binary form must reproduce the above copyright notice, this
<> 144:ef7eb2e8f9f7 12 * list of conditions and the following disclaimer in the documentation and/or
<> 144:ef7eb2e8f9f7 13 * other materials provided with the distribution.
<> 144:ef7eb2e8f9f7 14 *
<> 144:ef7eb2e8f9f7 15 * o Neither the name of Freescale Semiconductor, Inc. nor the names of its
<> 144:ef7eb2e8f9f7 16 * contributors may be used to endorse or promote products derived from this
<> 144:ef7eb2e8f9f7 17 * software without specific prior written permission.
<> 144:ef7eb2e8f9f7 18 *
<> 144:ef7eb2e8f9f7 19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
<> 144:ef7eb2e8f9f7 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
<> 144:ef7eb2e8f9f7 21 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
<> 144:ef7eb2e8f9f7 22 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
<> 144:ef7eb2e8f9f7 23 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
<> 144:ef7eb2e8f9f7 24 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
<> 144:ef7eb2e8f9f7 25 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
<> 144:ef7eb2e8f9f7 26 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
<> 144:ef7eb2e8f9f7 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
<> 144:ef7eb2e8f9f7 28 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
<> 144:ef7eb2e8f9f7 29 */
<> 144:ef7eb2e8f9f7 30
<> 144:ef7eb2e8f9f7 31 #include "fsl_lptmr.h"
<> 144:ef7eb2e8f9f7 32
<> 144:ef7eb2e8f9f7 33 /*******************************************************************************
<> 144:ef7eb2e8f9f7 34 * Prototypes
<> 144:ef7eb2e8f9f7 35 ******************************************************************************/
<> 144:ef7eb2e8f9f7 36 /*!
<> 144:ef7eb2e8f9f7 37 * @brief Gets the instance from the base address to be used to gate or ungate the module clock
<> 144:ef7eb2e8f9f7 38 *
<> 144:ef7eb2e8f9f7 39 * @param base LPTMR peripheral base address
<> 144:ef7eb2e8f9f7 40 *
<> 144:ef7eb2e8f9f7 41 * @return The LPTMR instance
<> 144:ef7eb2e8f9f7 42 */
<> 144:ef7eb2e8f9f7 43 static uint32_t LPTMR_GetInstance(LPTMR_Type *base);
<> 144:ef7eb2e8f9f7 44
<> 144:ef7eb2e8f9f7 45 /*******************************************************************************
<> 144:ef7eb2e8f9f7 46 * Variables
<> 144:ef7eb2e8f9f7 47 ******************************************************************************/
<> 144:ef7eb2e8f9f7 48 /*! @brief Pointers to LPTMR bases for each instance. */
<> 144:ef7eb2e8f9f7 49 static LPTMR_Type *const s_lptmrBases[] = LPTMR_BASE_PTRS;
<> 144:ef7eb2e8f9f7 50
<> 144:ef7eb2e8f9f7 51 /*! @brief Pointers to LPTMR clocks for each instance. */
<> 144:ef7eb2e8f9f7 52 static const clock_ip_name_t s_lptmrClocks[] = LPTMR_CLOCKS;
<> 144:ef7eb2e8f9f7 53
<> 144:ef7eb2e8f9f7 54 /*******************************************************************************
<> 144:ef7eb2e8f9f7 55 * Code
<> 144:ef7eb2e8f9f7 56 ******************************************************************************/
<> 144:ef7eb2e8f9f7 57 static uint32_t LPTMR_GetInstance(LPTMR_Type *base)
<> 144:ef7eb2e8f9f7 58 {
<> 144:ef7eb2e8f9f7 59 uint32_t instance;
<> 144:ef7eb2e8f9f7 60
<> 144:ef7eb2e8f9f7 61 /* Find the instance index from base address mappings. */
<> 144:ef7eb2e8f9f7 62 for (instance = 0; instance < FSL_FEATURE_SOC_LPTMR_COUNT; instance++)
<> 144:ef7eb2e8f9f7 63 {
<> 144:ef7eb2e8f9f7 64 if (s_lptmrBases[instance] == base)
<> 144:ef7eb2e8f9f7 65 {
<> 144:ef7eb2e8f9f7 66 break;
<> 144:ef7eb2e8f9f7 67 }
<> 144:ef7eb2e8f9f7 68 }
<> 144:ef7eb2e8f9f7 69
<> 144:ef7eb2e8f9f7 70 assert(instance < FSL_FEATURE_SOC_LPTMR_COUNT);
<> 144:ef7eb2e8f9f7 71
<> 144:ef7eb2e8f9f7 72 return instance;
<> 144:ef7eb2e8f9f7 73 }
<> 144:ef7eb2e8f9f7 74
<> 144:ef7eb2e8f9f7 75 void LPTMR_Init(LPTMR_Type *base, const lptmr_config_t *config)
<> 144:ef7eb2e8f9f7 76 {
<> 144:ef7eb2e8f9f7 77 assert(config);
<> 144:ef7eb2e8f9f7 78
<> 144:ef7eb2e8f9f7 79 /* Ungate the LPTMR clock*/
<> 144:ef7eb2e8f9f7 80 CLOCK_EnableClock(s_lptmrClocks[LPTMR_GetInstance(base)]);
<> 144:ef7eb2e8f9f7 81
<> 144:ef7eb2e8f9f7 82 /* Configure the timers operation mode and input pin setup */
<> 144:ef7eb2e8f9f7 83 base->CSR = (LPTMR_CSR_TMS(config->timerMode) | LPTMR_CSR_TFC(config->enableFreeRunning) |
<> 144:ef7eb2e8f9f7 84 LPTMR_CSR_TPP(config->pinPolarity) | LPTMR_CSR_TPS(config->pinSelect));
<> 144:ef7eb2e8f9f7 85
<> 144:ef7eb2e8f9f7 86 /* Configure the prescale value and clock source */
<> 144:ef7eb2e8f9f7 87 base->PSR = (LPTMR_PSR_PRESCALE(config->value) | LPTMR_PSR_PBYP(config->bypassPrescaler) |
<> 144:ef7eb2e8f9f7 88 LPTMR_PSR_PCS(config->prescalerClockSource));
<> 144:ef7eb2e8f9f7 89 }
<> 144:ef7eb2e8f9f7 90
<> 144:ef7eb2e8f9f7 91 void LPTMR_Deinit(LPTMR_Type *base)
<> 144:ef7eb2e8f9f7 92 {
<> 144:ef7eb2e8f9f7 93 /* Disable the LPTMR and reset the internal logic */
<> 144:ef7eb2e8f9f7 94 base->CSR &= ~LPTMR_CSR_TEN_MASK;
<> 144:ef7eb2e8f9f7 95 /* Gate the LPTMR clock*/
<> 144:ef7eb2e8f9f7 96 CLOCK_DisableClock(s_lptmrClocks[LPTMR_GetInstance(base)]);
<> 144:ef7eb2e8f9f7 97 }
<> 144:ef7eb2e8f9f7 98
<> 144:ef7eb2e8f9f7 99 void LPTMR_GetDefaultConfig(lptmr_config_t *config)
<> 144:ef7eb2e8f9f7 100 {
<> 144:ef7eb2e8f9f7 101 assert(config);
<> 144:ef7eb2e8f9f7 102
<> 144:ef7eb2e8f9f7 103 /* Use time counter mode */
<> 144:ef7eb2e8f9f7 104 config->timerMode = kLPTMR_TimerModeTimeCounter;
<> 144:ef7eb2e8f9f7 105 /* Use input 0 as source in pulse counter mode */
<> 144:ef7eb2e8f9f7 106 config->pinSelect = kLPTMR_PinSelectInput_0;
<> 144:ef7eb2e8f9f7 107 /* Pulse input pin polarity is active-high */
<> 144:ef7eb2e8f9f7 108 config->pinPolarity = kLPTMR_PinPolarityActiveHigh;
<> 144:ef7eb2e8f9f7 109 /* Counter resets whenever TCF flag is set */
<> 144:ef7eb2e8f9f7 110 config->enableFreeRunning = false;
<> 144:ef7eb2e8f9f7 111 /* Bypass the prescaler */
<> 144:ef7eb2e8f9f7 112 config->bypassPrescaler = true;
<> 144:ef7eb2e8f9f7 113 /* LPTMR clock source */
<> 144:ef7eb2e8f9f7 114 config->prescalerClockSource = kLPTMR_PrescalerClock_1;
<> 144:ef7eb2e8f9f7 115 /* Divide the prescaler clock by 2 */
<> 144:ef7eb2e8f9f7 116 config->value = kLPTMR_Prescale_Glitch_0;
<> 144:ef7eb2e8f9f7 117 }