| /* |
| * Copyright (c) 2016, Freescale Semiconductor, Inc. |
| * Copyright 2016-2017 NXP |
| * All rights reserved. |
| * |
| * SPDX-License-Identifier: BSD-3-Clause |
| */ |
| |
| #include "fsl_cmt.h" |
| |
| /******************************************************************************* |
| * Definitions |
| ******************************************************************************/ |
| |
| /* Component ID definition, used by tools. */ |
| #ifndef FSL_COMPONENT_ID |
| #define FSL_COMPONENT_ID "platform.drivers.cmt" |
| #endif |
| |
| /* 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) |
| |
| /******************************************************************************* |
| * Prototypes |
| ******************************************************************************/ |
| |
| /*! |
| * @brief Get instance number for CMT module. |
| * |
| * @param base CMT peripheral base address. |
| */ |
| static uint32_t CMT_GetInstance(CMT_Type *base); |
| |
| /******************************************************************************* |
| * Variables |
| ******************************************************************************/ |
| |
| #if !(defined(FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) && FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) |
| /*! @brief Pointers to cmt clocks for each instance. */ |
| static const clock_ip_name_t s_cmtClock[FSL_FEATURE_SOC_CMT_COUNT] = CMT_CLOCKS; |
| #endif /* FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL */ |
| |
| /*! @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. */ |
| static 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 < ARRAY_SIZE(s_cmtBases); instance++) |
| { |
| if (s_cmtBases[instance] == base) |
| { |
| break; |
| } |
| } |
| |
| assert(instance < ARRAY_SIZE(s_cmtBases)); |
| |
| return instance; |
| } |
| |
| /*! |
| * brief Gets the CMT default configuration structure. This API |
| * gets the default configuration structure for the CMT_Init(). |
| * Use the initialized structure unchanged in CMT_Init() or modify |
| * fields of the structure before calling the CMT_Init(). |
| * |
| * param config The CMT configuration structure pointer. |
| */ |
| void CMT_GetDefaultConfig(cmt_config_t *config) |
| { |
| assert(config); |
| |
| /* Initializes the configure structure to zero. */ |
| memset(config, 0, sizeof(*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; |
| } |
| |
| /*! |
| * brief Initializes the CMT module. |
| * |
| * This function ungates the module clock and sets the CMT internal clock, |
| * interrupt, and infrared output signal for the CMT module. |
| * |
| * param base CMT peripheral base address. |
| * param config The CMT basic configuration structure. |
| * param busClock_Hz The CMT module input clock - bus clock frequency. |
| */ |
| 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; |
| |
| #if !(defined(FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) && FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) |
| /* Ungate clock. */ |
| CLOCK_EnableClock(s_cmtClock[CMT_GetInstance(base)]); |
| #endif /* FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL */ |
| |
| /* 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)]); |
| } |
| } |
| |
| /*! |
| * brief Disables the CMT module and gate control. |
| * |
| * This function disables CMT modulator, interrupts, and gates the |
| * CMT clock control. CMT_Init must be called to use the CMT again. |
| * |
| * param base CMT peripheral base address. |
| */ |
| 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)]); |
| |
| #if !(defined(FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) && FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) |
| /* Gate the clock. */ |
| CLOCK_DisableClock(s_cmtClock[CMT_GetInstance(base)]); |
| #endif /* FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL */ |
| } |
| |
| /*! |
| * brief Selects the mode for CMT. |
| * |
| * param base CMT peripheral base address. |
| * param mode The CMT feature mode enumeration. See "cmt_mode_t". |
| * param modulateConfig The carrier generation and modulator configuration. |
| */ |
| void CMT_SetMode(CMT_Type *base, cmt_mode_t mode, cmt_modulate_config_t *modulateConfig) |
| { |
| uint8_t mscReg = base->MSC; |
| |
| /* Judge 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); |
| mscReg &= ~(CMT_MSC_FSK_MASK | CMT_MSC_BASE_MASK); |
| mscReg |= mode; |
| } |
| else |
| { |
| mscReg &= ~CMT_MSC_MCGEN_MASK; |
| } |
| /* Set the CMT mode. */ |
| base->MSC = mscReg; |
| } |
| |
| /*! |
| * brief Gets the mode of the CMT module. |
| * |
| * param base CMT peripheral base address. |
| * return The CMT mode. |
| * kCMT_DirectIROCtl Carrier modulator is disabled; the IRO signal is directly in software control. |
| * kCMT_TimeMode Carrier modulator is enabled in time mode. |
| * kCMT_FSKMode Carrier modulator is enabled in FSK mode. |
| * kCMT_BasebandMode Carrier modulator is enabled in baseband mode. |
| */ |
| 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; |
| } |
| } |
| } |
| |
| /*! |
| * brief Gets the actual CMT clock frequency. |
| * |
| * param base CMT peripheral base address. |
| * param busClock_Hz CMT module input clock - bus clock frequency. |
| * return The CMT clock frequency. |
| */ |
| 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; |
| } |
| |
| /*! |
| * brief Sets the modulation mark and space time period for the CMT modulator. |
| * |
| * This function sets the mark time period of the CMT modulator counter |
| * to control the mark time of the output modulated signal from the carrier generator output signal. |
| * If the CMT clock frequency is Fcmt and the carrier out signal frequency is fcg: |
| * - In Time and Baseband mode: The mark period of the generated signal equals (markCount + 1) / (Fcmt/8). |
| * The space period of the generated signal equals spaceCount / (Fcmt/8). |
| * - In FSK mode: The mark period of the generated signal equals (markCount + 1)/fcg. |
| * The space period of the generated signal equals spaceCount / fcg. |
| * |
| * param base Base address for current CMT instance. |
| * param markCount The number of clock period for CMT modulator signal mark period, |
| * in the range of 0 ~ 0xFFFF. |
| * param spaceCount The number of clock period for CMT modulator signal space period, |
| * in the range of the 0 ~ 0xFFFF. |
| */ |
| 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; |
| } |
| |
| /*! |
| * brief Sets the IRO (infrared output) signal state. |
| * |
| * Changes the states of the IRO signal when the kCMT_DirectIROMode mode is set |
| * and the IRO signal is enabled. |
| * |
| * param base CMT peripheral base address. |
| * param state The control of the IRO signal. See "cmt_infrared_output_state_t" |
| */ |
| 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; |
| } |