added prescaler for 16 bit pwm in LPC1347 target
Fork of mbed-dev by
Diff: targets/hal/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_K66F/drivers/fsl_cmt.c
- Revision:
- 144:ef7eb2e8f9f7
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/targets/hal/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_K66F/drivers/fsl_cmt.c Fri Sep 02 15:07:44 2016 +0100 @@ -0,0 +1,260 @@ +/* + * 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_cmt.h" + +/******************************************************************************* + * Definitions + ******************************************************************************/ + +/* The standard intermediate frequency (IF). */ +#define CMT_INTERMEDIATEFREQUENCY_8MHZ (8000000U) +/* CMT data modulate mask. */ +#define CMT_MODULATE_COUNT_WIDTH (8U) +/* CMT diver 1. */ +#define CMT_CMTDIV_ONE (1) +/* CMT diver 2. */ +#define CMT_CMTDIV_TWO (2) +/* CMT diver 4. */ +#define CMT_CMTDIV_FOUR (4) +/* CMT diver 8. */ +#define CMT_CMTDIV_EIGHT (8) +/* CMT mode bit mask. */ +#define CMT_MODE_BIT_MASK (CMT_MSC_MCGEN_MASK | CMT_MSC_FSK_MASK | CMT_MSC_BASE_MASK) + +/******************************************************************************* + * Prototypes + ******************************************************************************/ + +/*! + * @brief Get instance number for CMT module. + * + * @param base CMT peripheral base address. + */ +static uint32_t CMT_GetInstance(CMT_Type *base); + +/******************************************************************************* + * Variables + ******************************************************************************/ + +/*! @brief Pointers to cmt clocks for each instance. */ +const clock_ip_name_t s_cmtClock[FSL_FEATURE_SOC_CMT_COUNT] = CMT_CLOCKS; + +/*! @brief Pointers to cmt bases for each instance. */ +static CMT_Type *const s_cmtBases[] = CMT_BASE_PTRS; + +/*! @brief Pointers to cmt IRQ number for each instance. */ +const IRQn_Type s_cmtIrqs[] = CMT_IRQS; + +/******************************************************************************* + * Codes + ******************************************************************************/ + +static uint32_t CMT_GetInstance(CMT_Type *base) +{ + uint32_t instance; + + /* Find the instance index from base address mappings. */ + for (instance = 0; instance < FSL_FEATURE_SOC_CMT_COUNT; instance++) + { + if (s_cmtBases[instance] == base) + { + break; + } + } + + assert(instance < FSL_FEATURE_SOC_CMT_COUNT); + + return instance; +} + +void CMT_GetDefaultConfig(cmt_config_t *config) +{ + assert(config); + + /* Default infrared output is enabled and set with high active, the divider is set to 1. */ + config->isInterruptEnabled = false; + config->isIroEnabled = true; + config->iroPolarity = kCMT_IROActiveHigh; + config->divider = kCMT_SecondClkDiv1; +} + +void CMT_Init(CMT_Type *base, const cmt_config_t *config, uint32_t busClock_Hz) +{ + assert(config); + assert(busClock_Hz >= CMT_INTERMEDIATEFREQUENCY_8MHZ); + + uint8_t divider; + + /* Ungate clock. */ + CLOCK_EnableClock(s_cmtClock[CMT_GetInstance(base)]); + + /* Sets clock divider. The divider set in pps should be set + to make sycClock_Hz/divder = 8MHz */ + base->PPS = CMT_PPS_PPSDIV(busClock_Hz / CMT_INTERMEDIATEFREQUENCY_8MHZ - 1); + divider = base->MSC; + divider &= ~CMT_MSC_CMTDIV_MASK; + divider |= CMT_MSC_CMTDIV(config->divider); + base->MSC = divider; + + /* Set the IRO signal. */ + base->OC = CMT_OC_CMTPOL(config->iroPolarity) | CMT_OC_IROPEN(config->isIroEnabled); + + /* Set interrupt. */ + if (config->isInterruptEnabled) + { + CMT_EnableInterrupts(base, kCMT_EndOfCycleInterruptEnable); + EnableIRQ(s_cmtIrqs[CMT_GetInstance(base)]); + } +} + +void CMT_Deinit(CMT_Type *base) +{ + /*Disable the CMT modulator. */ + base->MSC = 0; + + /* Disable the interrupt. */ + CMT_DisableInterrupts(base, kCMT_EndOfCycleInterruptEnable); + DisableIRQ(s_cmtIrqs[CMT_GetInstance(base)]); + + /* Gate the clock. */ + CLOCK_DisableClock(s_cmtClock[CMT_GetInstance(base)]); +} + +void CMT_SetMode(CMT_Type *base, cmt_mode_t mode, cmt_modulate_config_t *modulateConfig) +{ + uint8_t mscReg; + + /* Set the mode. */ + if (mode != kCMT_DirectIROCtl) + { + assert(modulateConfig); + + /* Set carrier generator. */ + CMT_SetCarrirGenerateCountOne(base, modulateConfig->highCount1, modulateConfig->lowCount1); + if (mode == kCMT_FSKMode) + { + CMT_SetCarrirGenerateCountTwo(base, modulateConfig->highCount2, modulateConfig->lowCount2); + } + + /* Set carrier modulator. */ + CMT_SetModulateMarkSpace(base, modulateConfig->markCount, modulateConfig->spaceCount); + } + + /* Set the CMT mode. */ + mscReg = base->MSC; + mscReg &= ~CMT_MODE_BIT_MASK; + mscReg |= mode; + + base->MSC = mscReg; +} + +cmt_mode_t CMT_GetMode(CMT_Type *base) +{ + uint8_t mode = base->MSC; + + if (!(mode & CMT_MSC_MCGEN_MASK)) + { /* Carrier modulator disabled and the IRO signal is in direct software control. */ + return kCMT_DirectIROCtl; + } + else + { + /* Carrier modulator is enabled. */ + if (mode & CMT_MSC_BASE_MASK) + { + /* Base band mode. */ + return kCMT_BasebandMode; + } + else if (mode & CMT_MSC_FSK_MASK) + { + /* FSK mode. */ + return kCMT_FSKMode; + } + else + { + /* Time mode. */ + return kCMT_TimeMode; + } + } +} + +uint32_t CMT_GetCMTFrequency(CMT_Type *base, uint32_t busClock_Hz) +{ + uint32_t frequency; + uint32_t divider; + + /* Get intermediate frequency. */ + frequency = busClock_Hz / ((base->PPS & CMT_PPS_PPSDIV_MASK) + 1); + + /* Get the second divider. */ + divider = ((base->MSC & CMT_MSC_CMTDIV_MASK) >> CMT_MSC_CMTDIV_SHIFT); + /* Get CMT frequency. */ + switch ((cmt_second_clkdiv_t)divider) + { + case kCMT_SecondClkDiv1: + frequency = frequency / CMT_CMTDIV_ONE; + break; + case kCMT_SecondClkDiv2: + frequency = frequency / CMT_CMTDIV_TWO; + break; + case kCMT_SecondClkDiv4: + frequency = frequency / CMT_CMTDIV_FOUR; + break; + case kCMT_SecondClkDiv8: + frequency = frequency / CMT_CMTDIV_EIGHT; + break; + default: + frequency = frequency / CMT_CMTDIV_ONE; + break; + } + + return frequency; +} + +void CMT_SetModulateMarkSpace(CMT_Type *base, uint32_t markCount, uint32_t spaceCount) +{ + /* Set modulate mark. */ + base->CMD1 = (markCount >> CMT_MODULATE_COUNT_WIDTH) & CMT_CMD1_MB_MASK; + base->CMD2 = (markCount & CMT_CMD2_MB_MASK); + /* Set modulate space. */ + base->CMD3 = (spaceCount >> CMT_MODULATE_COUNT_WIDTH) & CMT_CMD3_SB_MASK; + base->CMD4 = spaceCount & CMT_CMD4_SB_MASK; +} + +void CMT_SetIroState(CMT_Type *base, cmt_infrared_output_state_t state) +{ + uint8_t ocReg = base->OC; + + ocReg &= ~CMT_OC_IROL_MASK; + ocReg |= CMT_OC_IROL(state); + + /* Set the infrared output signal control. */ + base->OC = ocReg; +}