/*
 * Copyright 2022-2024 NXP
 * All rights reserved.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

#include "fsl_lpuart.h"

/*******************************************************************************
 * Definitions
 ******************************************************************************/

/* Component ID definition, used by tools. */
#ifndef FSL_COMPONENT_ID
#define FSL_COMPONENT_ID "platform.drivers.lpflexcomm_lpuart"
#endif

/*!
 * @brief Used for conversion from `lpflexcomm_irq_handler_t` to `lpuart_irq_handler_t`
 */
typedef union lpuart_to_lpflexcomm
{
    lpuart_irq_handler_t lpuart_handler;
    lpflexcomm_irq_handler_t lpflexcomm_handler;
} lpuart_to_lpflexcomm_t;

/* LPUART transfer state. */
enum
{
    kLPUART_TxIdle, /*!< TX idle. */
    kLPUART_TxBusy, /*!< TX busy. */
    kLPUART_RxIdle, /*!< RX idle. */
    kLPUART_RxBusy  /*!< RX busy. */
};

/*******************************************************************************
 * Prototypes
 ******************************************************************************/
/*!
 * @brief Check whether the RX ring buffer is full.
 *
 * @userData handle LPUART handle pointer.
 * @retval true  RX ring buffer is full.
 * @retval false RX ring buffer is not full.
 */
static bool LPUART_TransferIsRxRingBufferFull(LPUART_Type *base, lpuart_handle_t *handle);

/*!
 * @brief Write to TX register using non-blocking method.
 *
 * This function writes data to the TX register directly, upper layer must make
 * sure the TX register is empty or TX FIFO has empty room before calling this function.
 *
 * @note This function does not check whether all the data has been sent out to bus,
 * so before disable TX, check kLPUART_TransmissionCompleteFlag to ensure the TX is
 * finished.
 *
 * @param base LPUART peripheral base address.
 * @param data Start address of the data to write.
 * @param length Size of the buffer to be sent.
 */
static void LPUART_WriteNonBlocking(LPUART_Type *base, const uint8_t *data, size_t length);

/*!
 * @brief Write to TX register using non-blocking method in 9bit or 10bit mode.
 *
 * @note This function only support 9bit or 10bit transfer.
 *
 * @param base LPUART peripheral base address.
 * @param data Start address of the data to write.
 * @param length Size of the buffer to be sent.
 */
static void LPUART_WriteNonBlocking16bit(LPUART_Type *base, const uint16_t *data, size_t length);

/*!
 * @brief Read RX register using non-blocking method.
 *
 * This function reads data from the TX register directly, upper layer must make
 * sure the RX register is full or TX FIFO has data before calling this function.
 *
 * @param base LPUART peripheral base address.
 * @param data Start address of the buffer to store the received data.
 * @param length Size of the buffer.
 */
static void LPUART_ReadNonBlocking(LPUART_Type *base, uint8_t *data, size_t length);

/*!
 * @brief Read RX register using non-blocking method in 9bit or 10bit mode.
 *
 * @note This function only support 9bit or 10bit transfer.
 *
 * @param base LPUART peripheral base address.
 * @param data Start address of the buffer to store the received data.
 * @param length Size of the buffer.
 */
static void LPUART_ReadNonBlocking16bit(LPUART_Type *base, uint16_t *data, size_t length);

/*******************************************************************************
 * Variables
 ******************************************************************************/
/* Array of LPUART peripheral base address. */
static LPUART_Type *const s_lpuartBases[] = LPUART_BASE_PTRS;

/* Array of LPUART IRQ number. */
const IRQn_Type s_lpuartIRQ[] = LPUART_RX_TX_IRQS;

/*******************************************************************************
 * Code
 ******************************************************************************/
/*!
 * brief Get the LPUART instance from peripheral base address.
 *
 * param base LPUART peripheral base address.
 * return LPUART instance.
 */
uint32_t LPUART_GetInstance(LPUART_Type *base)
{
    uint32_t instance;

    /* Find the instance index from base address mappings. */
    for (instance = 0U; instance < ARRAY_SIZE(s_lpuartBases); instance++)
    {
        if (MSDK_REG_SECURE_ADDR(s_lpuartBases[instance]) == MSDK_REG_SECURE_ADDR(base))
        {
            break;
        }
    }

    assert(instance < ARRAY_SIZE(s_lpuartBases));

    return instance;
}

/*!
 * brief Get the length of received data in RX ring buffer.
 *
 * userData handle LPUART handle pointer.
 * return Length of received data in RX ring buffer.
 */
size_t LPUART_TransferGetRxRingBufferLength(LPUART_Type *base, lpuart_handle_t *handle)
{
    assert(NULL != handle);

    size_t size;
    size_t tmpRxRingBufferSize   = handle->rxRingBufferSize;
    uint16_t tmpRxRingBufferTail = handle->rxRingBufferTail;
    uint16_t tmpRxRingBufferHead = handle->rxRingBufferHead;

    if (tmpRxRingBufferTail > tmpRxRingBufferHead)
    {
        size = ((size_t)tmpRxRingBufferHead + tmpRxRingBufferSize - (size_t)tmpRxRingBufferTail);
    }
    else
    {
        size = ((size_t)tmpRxRingBufferHead - (size_t)tmpRxRingBufferTail);
    }

    return size;
}

static bool LPUART_TransferIsRxRingBufferFull(LPUART_Type *base, lpuart_handle_t *handle)
{
    assert(NULL != handle);

    bool full;

    if (LPUART_TransferGetRxRingBufferLength(base, handle) == (handle->rxRingBufferSize - 1U))
    {
        full = true;
    }
    else
    {
        full = false;
    }
    return full;
}

static void LPUART_WriteNonBlocking(LPUART_Type *base, const uint8_t *data, size_t length)
{
    assert(NULL != data);

    size_t i;

    /* The Non Blocking write data API assume user have ensured there is enough space in
    peripheral to write. */
    for (i = 0; i < length; i++)
    {
        base->DATA = data[i];
    }
}

static void LPUART_WriteNonBlocking16bit(LPUART_Type *base, const uint16_t *data, size_t length)
{
    assert(NULL != data);

    size_t i;

    /* The Non Blocking write data API assume user have ensured there is enough space in
    peripheral to write. */
    for (i = 0; i < length; i++)
    {
        base->DATA = data[i];
    }
}

static void LPUART_ReadNonBlocking(LPUART_Type *base, uint8_t *data, size_t length)
{
    assert(NULL != data);

    size_t i;
#if defined(FSL_FEATURE_LPUART_HAS_7BIT_DATA_SUPPORT) && FSL_FEATURE_LPUART_HAS_7BIT_DATA_SUPPORT
    uint32_t ctrl        = base->CTRL;
    bool isSevenDataBits = (((ctrl & LPUART_CTRL_M7_MASK) != 0U) ||
                            (((ctrl & LPUART_CTRL_M_MASK) == 0U) && ((ctrl & LPUART_CTRL_PE_MASK) != 0U)));
#endif

    /* The Non Blocking read data API assume user have ensured there is enough space in
    peripheral to write. */
    for (i = 0; i < length; i++)
    {
#if defined(FSL_FEATURE_LPUART_HAS_7BIT_DATA_SUPPORT) && FSL_FEATURE_LPUART_HAS_7BIT_DATA_SUPPORT
        if (isSevenDataBits)
        {
            data[i] = (uint8_t)(base->DATA & 0x7FU);
        }
        else
        {
            data[i] = (uint8_t)base->DATA;
        }
#else
        data[i] = (uint8_t)(base->DATA);
#endif
    }
}

static void LPUART_ReadNonBlocking16bit(LPUART_Type *base, uint16_t *data, size_t length)
{
    assert(NULL != data);

    size_t i;
    /* The Non Blocking read data API assume user have ensured there is enough space in
    peripheral to write. */
    for (i = 0; i < length; i++)
    {
        data[i] = (uint16_t)(base->DATA & 0x03FFU);
    }
}
/*!
 * brief Initializes an LPUART instance with the user configuration structure and the peripheral clock.
 *
 * This function configures the LPUART module with user-defined settings. Call the LPUART_GetDefaultConfig() function
 * to configure the configuration structure and get the default configuration.
 * The example below shows how to use this API to configure the LPUART.
 * code
 *  lpuart_config_t lpuartConfig;
 *  lpuartConfig.baudRate_Bps = 115200U;
 *  lpuartConfig.parityMode = kLPUART_ParityDisabled;
 *  lpuartConfig.dataBitsCount = kLPUART_EightDataBits;
 *  lpuartConfig.isMsb = false;
 *  lpuartConfig.stopBitCount = kLPUART_OneStopBit;
 *  lpuartConfig.txFifoWatermark = 0;
 *  lpuartConfig.rxFifoWatermark = 1;
 *  LPUART_Init(LPUART1, &lpuartConfig, 20000000U);
 * endcode
 *
 * param base LPUART peripheral base address.
 * param config Pointer to a user-defined configuration structure.
 * param srcClock_Hz LPUART clock source frequency in HZ.
 * retval kStatus_LPUART_BaudrateNotSupport Baudrate is not support in current clock source.
 * retval kStatus_Success LPUART initialize succeed
 */
status_t LPUART_Init(LPUART_Type *base, const lpuart_config_t *config, uint32_t srcClock_Hz)
{
    assert(NULL != config);
    assert(0U < config->baudRate_Bps);
#if defined(FSL_FEATURE_LPUART_HAS_FIFO) && FSL_FEATURE_LPUART_HAS_FIFO
    assert((uint8_t)FSL_FEATURE_LPUART_FIFO_SIZEn(base) > config->txFifoWatermark);
    assert((uint8_t)FSL_FEATURE_LPUART_FIFO_SIZEn(base) > config->rxFifoWatermark);
#endif

    status_t status = kStatus_Success;
    uint32_t temp;
    uint16_t sbr, sbrTemp;
    uint8_t osr, osrTemp;
    uint32_t tempDiff, calculatedBaud, baudDiff;

    /* This LPUART instantiation uses a slightly different baud rate calculation
     * The idea is to use the best OSR (over-sampling rate) possible
     * Note, OSR is typically hard-set to 16 in other LPUART instantiations
     * loop to find the best OSR value possible, one that generates minimum baudDiff
     * iterate through the rest of the supported values of OSR */

    baudDiff = config->baudRate_Bps;
    osr      = 0U;
    sbr      = 0U;
    for (osrTemp = 4U; osrTemp <= 32U; osrTemp++)
    {
        /* calculate the temporary sbr value   */
        sbrTemp = (uint16_t)((srcClock_Hz * 2U / (config->baudRate_Bps * (uint32_t)osrTemp) + 1U) / 2U);
        /*set sbrTemp to 1 if the sourceClockInHz can not satisfy the desired baud rate*/
        if (sbrTemp == 0U)
        {
            sbrTemp = 1U;
        }
        else if (sbrTemp > LPUART_BAUD_SBR_MASK)
        {
            sbrTemp = LPUART_BAUD_SBR_MASK;
        }
        else
        {
            /* For MISRA 15.7 */
        }
        /* Calculate the baud rate based on the temporary OSR and SBR values */
        calculatedBaud = (srcClock_Hz / ((uint32_t)osrTemp * (uint32_t)sbrTemp));
        tempDiff       = calculatedBaud > config->baudRate_Bps ? (calculatedBaud - config->baudRate_Bps) :
                                                                 (config->baudRate_Bps - calculatedBaud);

        if (tempDiff <= baudDiff)
        {
            baudDiff = tempDiff;
            osr      = osrTemp; /* update and store the best OSR value calculated */
            sbr      = sbrTemp; /* update store the best SBR value calculated */
        }
    }

    /* Check to see if actual baud rate is within 3% of desired baud rate
     * based on the best calculate OSR value */
    if (baudDiff > ((config->baudRate_Bps / 100U) * 3U))
    {
        /* Unacceptable baud rate difference of more than 3%*/
        status = kStatus_LPUART_BaudrateNotSupport;
    }
    else
    {
#if !(defined(LPFLEXCOMM_INIT_NOT_USED_IN_DRIVER) && LPFLEXCOMM_INIT_NOT_USED_IN_DRIVER)
        /* initialize flexcomm to LPUART mode */
        status = LP_FLEXCOMM_Init(LPUART_GetInstance(base), LP_FLEXCOMM_PERIPH_LPUART);
        if (kStatus_Success != status)
        {
            return status;
        }
#endif /* LPFLEXCOMM_INIT_NOT_USED_IN_DRIVER */

#if defined(FSL_FEATURE_LPUART_HAS_GLOBAL) && FSL_FEATURE_LPUART_HAS_GLOBAL
        /*Reset all internal logic and registers, except the Global Register */
        LPUART_SoftwareReset(base);
#else
        /* Disable LPUART TX RX before setting. */
        base->CTRL &= ~(LPUART_CTRL_TE_MASK | LPUART_CTRL_RE_MASK);
#endif

        temp = base->BAUD;

        /* Acceptable baud rate, check if OSR is between 4x and 7x oversampling.
         * If so, then "BOTHEDGE" sampling must be turned on */
        if ((osr > 3U) && (osr < 8U))
        {
            temp |= LPUART_BAUD_BOTHEDGE_MASK;
        }

        /* program the osr value (bit value is one less than actual value) */
        temp &= ~LPUART_BAUD_OSR_MASK;
        temp |= LPUART_BAUD_OSR((uint32_t)osr - 1UL);

        /* write the sbr value to the BAUD registers */
        temp &= ~LPUART_BAUD_SBR_MASK;
        base->BAUD = temp | LPUART_BAUD_SBR(sbr);

        /* Set bit count and parity mode. */
        base->BAUD &= ~LPUART_BAUD_M10_MASK;

        temp = base->CTRL & ~(LPUART_CTRL_PE_MASK | LPUART_CTRL_PT_MASK | LPUART_CTRL_M_MASK | LPUART_CTRL_ILT_MASK |
                              LPUART_CTRL_IDLECFG_MASK);

        temp |= (uint8_t)config->parityMode | LPUART_CTRL_IDLECFG(config->rxIdleConfig) |
                LPUART_CTRL_ILT(config->rxIdleType);

#if defined(FSL_FEATURE_LPUART_HAS_7BIT_DATA_SUPPORT) && FSL_FEATURE_LPUART_HAS_7BIT_DATA_SUPPORT
        if (kLPUART_SevenDataBits == config->dataBitsCount)
        {
            if (kLPUART_ParityDisabled != config->parityMode)
            {
                temp &= ~LPUART_CTRL_M7_MASK; /* Seven data bits and one parity bit */
            }
            else
            {
                temp |= LPUART_CTRL_M7_MASK;
            }
        }
        else
#endif
        {
            if (kLPUART_ParityDisabled != config->parityMode)
            {
                temp |= LPUART_CTRL_M_MASK; /* Eight data bits and one parity bit */
            }
        }

        base->CTRL = temp;

#if defined(FSL_FEATURE_LPUART_HAS_STOP_BIT_CONFIG_SUPPORT) && FSL_FEATURE_LPUART_HAS_STOP_BIT_CONFIG_SUPPORT
        /* set stop bit per char */
        temp       = base->BAUD & ~LPUART_BAUD_SBNS_MASK;
        base->BAUD = temp | LPUART_BAUD_SBNS((uint8_t)config->stopBitCount);
#endif

#if defined(FSL_FEATURE_LPUART_HAS_FIFO) && FSL_FEATURE_LPUART_HAS_FIFO
        /* Set tx/rx WATER watermark
           Note:
           Take care of the RX FIFO, RX interrupt request only assert when received bytes
           equal or more than RX water mark, there is potential issue if RX water
           mark larger than 1.
           For example, if RX FIFO water mark is 2, upper layer needs 5 bytes and
           5 bytes are received. the last byte will be saved in FIFO but not trigger
           RX interrupt because the water mark is 2.
         */
        base->WATER = (((uint32_t)(config->rxFifoWatermark) << 16U) | config->txFifoWatermark);

        /* Enable tx/rx FIFO */
        base->FIFO |= (LPUART_FIFO_TXFE_MASK | LPUART_FIFO_RXFE_MASK);

        /* Flush FIFO */
        base->FIFO |= (LPUART_FIFO_TXFLUSH_MASK | LPUART_FIFO_RXFLUSH_MASK);
#endif

        /* Clear all status flags */
        temp = (LPUART_STAT_RXEDGIF_MASK | LPUART_STAT_IDLE_MASK | LPUART_STAT_OR_MASK | LPUART_STAT_NF_MASK |
                LPUART_STAT_FE_MASK | LPUART_STAT_PF_MASK);

#if defined(FSL_FEATURE_LPUART_HAS_LIN_BREAK_DETECT) && FSL_FEATURE_LPUART_HAS_LIN_BREAK_DETECT
        temp |= LPUART_STAT_LBKDIF_MASK;
#endif

#if defined(FSL_FEATURE_LPUART_HAS_ADDRESS_MATCHING) && FSL_FEATURE_LPUART_HAS_ADDRESS_MATCHING
        temp |= (LPUART_STAT_MA1F_MASK | LPUART_STAT_MA2F_MASK);
#endif

#if defined(FSL_FEATURE_LPUART_HAS_MODEM_SUPPORT) && FSL_FEATURE_LPUART_HAS_MODEM_SUPPORT
        /* Set the CTS configuration/TX CTS source. */
        base->MODIR |= LPUART_MODIR_TXCTSC(config->txCtsConfig) | LPUART_MODIR_TXCTSSRC(config->txCtsSource);
        if (true == config->enableRxRTS)
        {
            /* Enable the receiver RTS(request-to-send) function. */
            base->MODIR |= LPUART_MODIR_RXRTSE_MASK;
        }
        if (true == config->enableTxCTS)
        {
            /* Enable the CTS(clear-to-send) function. */
            base->MODIR |= LPUART_MODIR_TXCTSE_MASK;
        }
#endif

        /* Set data bits order. */
        if (true == config->isMsb)
        {
            temp |= LPUART_STAT_MSBF_MASK;
        }
        else
        {
            temp &= ~LPUART_STAT_MSBF_MASK;
        }

        base->STAT |= temp;

        /* Enable TX/RX base on configure structure. */
        temp = base->CTRL;
        if (true == config->enableTx)
        {
            temp |= LPUART_CTRL_TE_MASK;
        }

        if (true == config->enableRx)
        {
            temp |= LPUART_CTRL_RE_MASK;
        }

        base->CTRL = temp;
#if defined(FSL_FEATURE_LPUART_HAS_TIMEOUT) && FSL_FEATURE_LPUART_HAS_TIMEOUT
        /* Timeout configuration. */
        base->REIR = (uint32_t)config->timeoutConfig.rxExtendedTimeoutValue;
        base->TEIR = (uint32_t)config->timeoutConfig.txExtendedTimeoutValue;
        base->TOCR |= (uint32_t)config->timeoutConfig.rxCounter0.enableCounter |
                      ((uint32_t)config->timeoutConfig.rxCounter1.enableCounter << 1U) |
                      ((uint32_t)config->timeoutConfig.txCounter0.enableCounter << 2U) |
                      ((uint32_t)config->timeoutConfig.txCounter1.enableCounter << 3U);
        base->TIMEOUT[0] = ((uint32_t)config->timeoutConfig.rxCounter0.timeoutCondition << 30U) |
                           (uint32_t)config->timeoutConfig.rxCounter0.timeoutValue;
        base->TIMEOUT[1] = ((uint32_t)config->timeoutConfig.rxCounter1.timeoutCondition << 30U) |
                           (uint32_t)config->timeoutConfig.rxCounter1.timeoutValue;
        base->TIMEOUT[2] = ((uint32_t)config->timeoutConfig.txCounter0.timeoutCondition << 30U) |
                           (uint32_t)config->timeoutConfig.txCounter0.timeoutValue;
        base->TIMEOUT[3] = ((uint32_t)config->timeoutConfig.txCounter1.timeoutCondition << 30U) |
                           (uint32_t)config->timeoutConfig.txCounter1.timeoutValue;
#endif

        /* Siglewire configuration. */
#if defined(FSL_FEATURE_LPUART_HAS_HDCR) && FSL_FEATURE_LPUART_HAS_HDCR
        base->HDCR = (uint32_t)config->rtsDelay << 8U;
        if (config->enableSingleWire)
        {
            base->HDCR |= 0xFUL;
        }
#endif
    }
    return status;
}
/*!
 * brief Deinitializes a LPUART instance.
 *
 * This function waits for transmit to complete, disables TX and RX, and disables the LPUART clock.
 *
 * param base LPUART peripheral base address.
 */
void LPUART_Deinit(LPUART_Type *base)
{
    uint32_t temp;

#if defined(FSL_FEATURE_LPUART_HAS_FIFO) && FSL_FEATURE_LPUART_HAS_FIFO
    /* Wait tx FIFO send out*/
    while (0U != ((base->WATER & LPUART_WATER_TXCOUNT_MASK) >> LPUART_WATER_TXWATER_SHIFT))
    {
    }
#endif
    /* Wait last char shift out */
    while (0U == (base->STAT & LPUART_STAT_TC_MASK))
    {
    }

    /* Clear all status flags */
    temp = (LPUART_STAT_RXEDGIF_MASK | LPUART_STAT_IDLE_MASK | LPUART_STAT_OR_MASK | LPUART_STAT_NF_MASK |
            LPUART_STAT_FE_MASK | LPUART_STAT_PF_MASK);

#if defined(FSL_FEATURE_LPUART_HAS_LIN_BREAK_DETECT) && FSL_FEATURE_LPUART_HAS_LIN_BREAK_DETECT
    temp |= LPUART_STAT_LBKDIF_MASK;
#endif

#if defined(FSL_FEATURE_LPUART_HAS_ADDRESS_MATCHING) && FSL_FEATURE_LPUART_HAS_ADDRESS_MATCHING
    temp |= (LPUART_STAT_MA1F_MASK | LPUART_STAT_MA2F_MASK);
#endif

    base->STAT |= temp;

    /* Disable the module. */
    base->CTRL = 0U;

#if !(defined(LPFLEXCOMM_INIT_NOT_USED_IN_DRIVER) && LPFLEXCOMM_INIT_NOT_USED_IN_DRIVER)
    LP_FLEXCOMM_Deinit(LPUART_GetInstance(base));
#endif
}

/*!
 * brief Gets the default configuration structure.
 *
 * This function initializes the LPUART configuration structure to a default value. The default
 * values are:
 *   lpuartConfig->baudRate_Bps = 115200U;
 *   lpuartConfig->parityMode = kLPUART_ParityDisabled;
 *   lpuartConfig->dataBitsCount = kLPUART_EightDataBits;
 *   lpuartConfig->isMsb = false;
 *   lpuartConfig->stopBitCount = kLPUART_OneStopBit;
 *   lpuartConfig->txFifoWatermark = 0;
 *   lpuartConfig->rxFifoWatermark = 1;
 *   lpuartConfig->rxIdleType = kLPUART_IdleTypeStartBit;
 *   lpuartConfig->rxIdleConfig = kLPUART_IdleCharacter1;
 *   lpuartConfig->enableTx = false;
 *   lpuartConfig->enableRx = false;
 *
 * param config Pointer to a configuration structure.
 */
void LPUART_GetDefaultConfig(lpuart_config_t *config)
{
    assert(NULL != config);

    /* Initializes the configure structure to zero. */
    (void)memset(config, 0, sizeof(*config));

    config->baudRate_Bps  = 115200U;
    config->parityMode    = kLPUART_ParityDisabled;
    config->dataBitsCount = kLPUART_EightDataBits;
    config->isMsb         = false;
#if defined(FSL_FEATURE_LPUART_HAS_STOP_BIT_CONFIG_SUPPORT) && FSL_FEATURE_LPUART_HAS_STOP_BIT_CONFIG_SUPPORT
    config->stopBitCount = kLPUART_OneStopBit;
#endif
#if defined(FSL_FEATURE_LPUART_HAS_FIFO) && FSL_FEATURE_LPUART_HAS_FIFO
    config->txFifoWatermark = 0U;
    config->rxFifoWatermark = 0U;
#endif
#if defined(FSL_FEATURE_LPUART_HAS_MODEM_SUPPORT) && FSL_FEATURE_LPUART_HAS_MODEM_SUPPORT
    config->enableRxRTS = false;
    config->enableTxCTS = false;
    config->txCtsConfig = kLPUART_CtsSampleAtStart;
    config->txCtsSource = kLPUART_CtsSourcePin;
#endif
    config->rxIdleType   = kLPUART_IdleTypeStartBit;
    config->rxIdleConfig = kLPUART_IdleCharacter1;
    config->enableTx     = false;
    config->enableRx     = false;
}

/*!
 * brief Sets the LPUART instance baudrate.
 *
 * This function configures the LPUART module baudrate. This function is used to update
 * the LPUART module baudrate after the LPUART module is initialized by the LPUART_Init.
 * code
 *  LPUART_SetBaudRate(LPUART1, 115200U, 20000000U);
 * endcode
 *
 * param base LPUART peripheral base address.
 * param baudRate_Bps LPUART baudrate to be set.
 * param srcClock_Hz LPUART clock source frequency in HZ.
 * retval kStatus_LPUART_BaudrateNotSupport Baudrate is not supported in the current clock source.
 * retval kStatus_Success Set baudrate succeeded.
 */
status_t LPUART_SetBaudRate(LPUART_Type *base, uint32_t baudRate_Bps, uint32_t srcClock_Hz)
{
    assert(0U < baudRate_Bps);

    status_t status = kStatus_Success;
    uint32_t temp, oldCtrl;
    uint16_t sbr, sbrTemp;
    uint8_t osr, osrTemp;
    uint32_t tempDiff, calculatedBaud, baudDiff;

    /* This LPUART instantiation uses a slightly different baud rate calculation
     * The idea is to use the best OSR (over-sampling rate) possible
     * Note, OSR is typically hard-set to 16 in other LPUART instantiations
     * loop to find the best OSR value possible, one that generates minimum baudDiff
     * iterate through the rest of the supported values of OSR */

    baudDiff = baudRate_Bps;
    osr      = 0U;
    sbr      = 0U;
    for (osrTemp = 4U; osrTemp <= 32U; osrTemp++)
    {
        /* calculate the temporary sbr value   */
        sbrTemp = (uint16_t)((srcClock_Hz * 2U / (baudRate_Bps * (uint32_t)osrTemp) + 1U) / 2U);
        /*set sbrTemp to 1 if the sourceClockInHz can not satisfy the desired baud rate*/
        if (sbrTemp == 0U)
        {
            sbrTemp = 1U;
        }
        else if (sbrTemp > LPUART_BAUD_SBR_MASK)
        {
            sbrTemp = LPUART_BAUD_SBR_MASK;
        }
        else
        {
            /* For MISRA 15.7 */
        }

        /* Calculate the baud rate based on the temporary OSR and SBR values */
        calculatedBaud = srcClock_Hz / ((uint32_t)osrTemp * (uint32_t)sbrTemp);

        tempDiff = calculatedBaud > baudRate_Bps ? (calculatedBaud - baudRate_Bps) : (baudRate_Bps - calculatedBaud);

        if (tempDiff <= baudDiff)
        {
            baudDiff = tempDiff;
            osr      = osrTemp; /* update and store the best OSR value calculated */
            sbr      = sbrTemp; /* update store the best SBR value calculated */
        }
    }

    /* Check to see if actual baud rate is within 3% of desired baud rate
     * based on the best calculate OSR value */
    if (baudDiff < (uint32_t)((baudRate_Bps / 100U) * 3U))
    {
        /* Store CTRL before disable Tx and Rx */
        oldCtrl = base->CTRL;

        /* Disable LPUART TX RX before setting. */
        base->CTRL &= ~(LPUART_CTRL_TE_MASK | LPUART_CTRL_RE_MASK);

        temp = base->BAUD;

        /* Acceptable baud rate, check if OSR is between 4x and 7x oversampling.
         * If so, then "BOTHEDGE" sampling must be turned on */
        if ((osr > 3U) && (osr < 8U))
        {
            temp |= LPUART_BAUD_BOTHEDGE_MASK;
        }

        /* program the osr value (bit value is one less than actual value) */
        temp &= ~LPUART_BAUD_OSR_MASK;
        temp |= LPUART_BAUD_OSR((uint32_t)osr - 1UL);

        /* write the sbr value to the BAUD registers */
        temp &= ~LPUART_BAUD_SBR_MASK;
        base->BAUD = temp | LPUART_BAUD_SBR(sbr);

        /* Restore CTRL. */
        base->CTRL = oldCtrl;
    }
    else
    {
        /* Unacceptable baud rate difference of more than 3%*/
        status = kStatus_LPUART_BaudrateNotSupport;
    }

    return status;
}

/*!
 * brief Enable 9-bit data mode for LPUART.
 *
 * This function set the 9-bit mode for LPUART module. The 9th bit is not used for parity thus can be modified by user.
 *
 * param base LPUART peripheral base address.
 * param enable true to enable, flase to disable.
 */
void LPUART_Enable9bitMode(LPUART_Type *base, bool enable)
{
    assert(base != NULL);

    uint32_t temp = 0U;

    if (enable)
    {
        /* Set LPUART_CTRL_M for 9-bit mode, clear LPUART_CTRL_PE to disable parity. */
        temp = base->CTRL & ~((uint32_t)LPUART_CTRL_PE_MASK | (uint32_t)LPUART_CTRL_M_MASK);
        temp |= (uint32_t)LPUART_CTRL_M_MASK;
        base->CTRL = temp;
    }
    else
    {
        /* Clear LPUART_CTRL_M. */
        base->CTRL &= ~(uint32_t)LPUART_CTRL_M_MASK;
    }
#if defined(FSL_FEATURE_LPUART_HAS_7BIT_DATA_SUPPORT) && FSL_FEATURE_LPUART_HAS_7BIT_DATA_SUPPORT
    /* Clear LPUART_CTRL_M7 to disable 7-bit mode. */
    base->CTRL &= ~(uint32_t)LPUART_CTRL_M7_MASK;
#endif
#if defined(FSL_FEATURE_LPUART_HAS_10BIT_DATA_SUPPORT) && FSL_FEATURE_LPUART_HAS_10BIT_DATA_SUPPORT
    /* Clear LPUART_BAUD_M10 to disable 10-bit mode. */
    base->BAUD &= ~(uint32_t)LPUART_BAUD_M10_MASK;
#endif
}

/*!
 * brief Transmit an address frame in 9-bit data mode.
 *
 * param base LPUART peripheral base address.
 * param address LPUART slave address.
 */
void LPUART_SendAddress(LPUART_Type *base, uint8_t address)
{
    assert(base != NULL);

    uint32_t temp = base->DATA & 0xFFFFFC00UL;
    temp |= ((uint32_t)address | (1UL << LPUART_DATA_R8T8_SHIFT));
    base->DATA = temp;
}

/*!
 * brief Enables LPUART interrupts according to a provided mask.
 *
 * This function enables the LPUART interrupts according to a provided mask. The mask
 * is a logical OR of enumeration members. See the ref _lpuart_interrupt_enable.
 * This examples shows how to enable TX empty interrupt and RX full interrupt:
 * code
 *     LPUART_EnableInterrupts(LPUART1,kLPUART_TxDataRegEmptyInterruptEnable | kLPUART_RxDataRegFullInterruptEnable);
 * endcode
 *
 * param base LPUART peripheral base address.
 * param mask The interrupts to enable. Logical OR of ref _uart_interrupt_enable.
 */
void LPUART_EnableInterrupts(LPUART_Type *base, uint32_t mask)
{
    uint32_t s_atomicOldInt;
    /* Only consider the real interrupt enable bits. */
    mask &= (uint32_t)kLPUART_AllInterruptEnable;

#if defined(FSL_FEATURE_LPUART_HAS_MCR) && FSL_FEATURE_LPUART_HAS_MCR
    /* Modem control interrupt enables */
    base->MCR |= (mask & 0xFUL);
#endif
#if defined(FSL_FEATURE_LPUART_HAS_TIMEOUT) && FSL_FEATURE_LPUART_HAS_TIMEOUT
    /* Timeout interrupt enables. */
    base->TOSR |= ((mask >> 2U) & 0xF00UL);
#endif
    /* Check int enable bits in base->BAUD */
    uint32_t baudRegMask = 0UL;
#if defined(FSL_FEATURE_LPUART_HAS_LIN_BREAK_DETECT) && FSL_FEATURE_LPUART_HAS_LIN_BREAK_DETECT
    baudRegMask |= ((mask << 8U) & LPUART_BAUD_LBKDIE_MASK);
    /* Clear bit 7 from mask */
    mask &= ~(uint32_t)kLPUART_LinBreakInterruptEnable;
#endif
    baudRegMask |= ((mask << 8U) & LPUART_BAUD_RXEDGIE_MASK);
    /* Clear bit 6 from mask */
    mask &= ~(uint32_t)kLPUART_RxActiveEdgeInterruptEnable;

    s_atomicOldInt = DisableGlobalIRQ();
    base->BAUD |= baudRegMask;
    EnableGlobalIRQ(s_atomicOldInt);

#if defined(FSL_FEATURE_LPUART_HAS_FIFO) && FSL_FEATURE_LPUART_HAS_FIFO
    /* Check int enable bits in base->FIFO */

    s_atomicOldInt = DisableGlobalIRQ();
    base->FIFO     = (base->FIFO & ~(LPUART_FIFO_TXOF_MASK | LPUART_FIFO_RXUF_MASK)) |
                 (mask & (LPUART_FIFO_TXOFE_MASK | LPUART_FIFO_RXUFE_MASK));
    EnableGlobalIRQ(s_atomicOldInt);

    /* Clear bit 9 and bit 8 from mask */
    mask &= ~((uint32_t)kLPUART_TxFifoOverflowInterruptEnable | (uint32_t)kLPUART_RxFifoUnderflowInterruptEnable);
#endif

    /* Check int enable bits in base->CTRL */
    s_atomicOldInt = DisableGlobalIRQ();
    base->CTRL |= mask;
    EnableGlobalIRQ(s_atomicOldInt);
}

/*!
 * brief Disables  LPUART interrupts according to a provided mask.
 *
 * This function disables the LPUART interrupts according to a provided mask. The mask
 * is a logical OR of enumeration members. See ref _lpuart_interrupt_enable.
 * This example shows how to disable the TX empty interrupt and RX full interrupt:
 * code
 *     LPUART_DisableInterrupts(LPUART1,kLPUART_TxDataRegEmptyInterruptEnable | kLPUART_RxDataRegFullInterruptEnable);
 * endcode
 *
 * param base LPUART peripheral base address.
 * param mask The interrupts to disable. Logical OR of ref _lpuart_interrupt_enable.
 */
void LPUART_DisableInterrupts(LPUART_Type *base, uint32_t mask)
{
    uint32_t s_atomicOldInt;
    /* Only consider the real interrupt enable bits. */
    mask &= (uint32_t)kLPUART_AllInterruptEnable;

#if defined(FSL_FEATURE_LPUART_HAS_MCR) && FSL_FEATURE_LPUART_HAS_MCR
    /* Modem control interrupts. */
    base->MCR &= ~(mask & 0xFUL);
#endif
#if defined(FSL_FEATURE_LPUART_HAS_TIMEOUT) && FSL_FEATURE_LPUART_HAS_TIMEOUT
    /* Timeout interrupt enables. */
    base->TOSR &= ~((mask >> 2U) & 0xF00UL);
#endif

    /* Clear int enable bits in base->BAUD */
    uint32_t baudRegMask = 0UL;
#if defined(FSL_FEATURE_LPUART_HAS_LIN_BREAK_DETECT) && FSL_FEATURE_LPUART_HAS_LIN_BREAK_DETECT
    baudRegMask |= ((mask << 8U) & LPUART_BAUD_LBKDIE_MASK);
    /* Clear bit 7 from mask */
    mask &= ~(uint32_t)kLPUART_LinBreakInterruptEnable;
#endif
    baudRegMask |= ((mask << 8U) & LPUART_BAUD_RXEDGIE_MASK);
    /* Clear bit 6 from mask */
    mask &= ~(uint32_t)kLPUART_RxActiveEdgeInterruptEnable;

    s_atomicOldInt = DisableGlobalIRQ();
    base->BAUD &= ~baudRegMask;
    EnableGlobalIRQ(s_atomicOldInt);

#if defined(FSL_FEATURE_LPUART_HAS_FIFO) && FSL_FEATURE_LPUART_HAS_FIFO
    /* Check int enable bits in base->FIFO */

    s_atomicOldInt = DisableGlobalIRQ();
    base->FIFO     = (base->FIFO & ~(LPUART_FIFO_TXOF_MASK | LPUART_FIFO_RXUF_MASK)) &
                 ~(mask & (LPUART_FIFO_TXOFE_MASK | LPUART_FIFO_RXUFE_MASK));
    EnableGlobalIRQ(s_atomicOldInt);
    /* Clear bit 9 and bit 8 from mask */
    mask &= ~((uint32_t)kLPUART_TxFifoOverflowInterruptEnable | (uint32_t)kLPUART_RxFifoUnderflowInterruptEnable);
#endif

    /* Clear int enable bits in base->CTRL */
    s_atomicOldInt = DisableGlobalIRQ();
    base->CTRL &= ~mask;
    EnableGlobalIRQ(s_atomicOldInt);
}

/*!
 * brief Gets enabled LPUART interrupts.
 *
 * This function gets the enabled LPUART interrupts. The enabled interrupts are returned
 * as the logical OR value of the enumerators ref _lpuart_interrupt_enable. To check
 * a specific interrupt enable status, compare the return value with enumerators
 * in ref _lpuart_interrupt_enable.
 * For example, to check whether the TX empty interrupt is enabled:
 * code
 *     uint32_t enabledInterrupts = LPUART_GetEnabledInterrupts(LPUART1);
 *
 *     if (kLPUART_TxDataRegEmptyInterruptEnable & enabledInterrupts)
 *     {
 *         ...
 *     }
 * endcode
 *
 * param base LPUART peripheral base address.
 * return LPUART interrupt flags which are logical OR of the enumerators in ref _lpuart_interrupt_enable.
 */
uint32_t LPUART_GetEnabledInterrupts(LPUART_Type *base)
{
    /* Check int enable bits in base->CTRL */
    uint32_t temp = (uint32_t)(base->CTRL & 0xFF0C000UL);

#if defined(FSL_FEATURE_LPUART_HAS_MCR) && FSL_FEATURE_LPUART_HAS_MCR
    /* Check modem control interrupts. */
    temp |= (base->MCR & 0xFUL);
#endif
#if defined(FSL_FEATURE_LPUART_HAS_TIMEOUT) && FSL_FEATURE_LPUART_HAS_TIMEOUT
    /* Check timeout control interrupts. */
    temp |= ((base->TOCR & 0xF00UL) << 2U);
#endif

    /* Check int enable bits in base->BAUD */
    temp = (temp & ~(uint32_t)kLPUART_RxActiveEdgeInterruptEnable) | ((base->BAUD & LPUART_BAUD_RXEDGIE_MASK) >> 8U);
#if defined(FSL_FEATURE_LPUART_HAS_LIN_BREAK_DETECT) && FSL_FEATURE_LPUART_HAS_LIN_BREAK_DETECT
    temp = (temp & ~(uint32_t)kLPUART_LinBreakInterruptEnable) | ((base->BAUD & LPUART_BAUD_LBKDIE_MASK) >> 8U);
#endif

#if defined(FSL_FEATURE_LPUART_HAS_FIFO) && FSL_FEATURE_LPUART_HAS_FIFO
    /* Check int enable bits in base->FIFO */
    temp =
        (temp & ~((uint32_t)kLPUART_TxFifoOverflowInterruptEnable | (uint32_t)kLPUART_RxFifoUnderflowInterruptEnable)) |
        (base->FIFO & (LPUART_FIFO_TXOFE_MASK | LPUART_FIFO_RXUFE_MASK));
#endif

    return temp;
}

/*!
 * brief Gets LPUART status flags.
 *
 * This function gets all LPUART status flags. The flags are returned as the logical
 * OR value of the enumerators ref _lpuart_flags. To check for a specific status,
 * compare the return value with enumerators in the ref _lpuart_flags.
 * For example, to check whether the TX is empty:
 * code
 *     if (kLPUART_TxDataRegEmptyFlag & LPUART_GetStatusFlags(LPUART1))
 *     {
 *         ...
 *     }
 * endcode
 *
 * param base LPUART peripheral base address.
 * return LPUART status flags which are ORed by the enumerators in the _lpuart_flags.
 */
uint32_t LPUART_GetStatusFlags(LPUART_Type *base)
{
    uint32_t temp;

    temp = (base->STAT & 0xC1FFC000UL);
#if defined(FSL_FEATURE_LPUART_HAS_MCR) && FSL_FEATURE_LPUART_HAS_MCR
    temp |= ((base->MSR & 0xFUL) << 2U);
#endif
#if defined(FSL_FEATURE_LPUART_HAS_TIMEOUT) && FSL_FEATURE_LPUART_HAS_TIMEOUT
    temp |= ((base->TOSR & 0xF00UL) << 2U);
#endif
#if defined(FSL_FEATURE_LPUART_HAS_FIFO) && FSL_FEATURE_LPUART_HAS_FIFO
    temp |= (base->FIFO &
             (LPUART_FIFO_TXEMPT_MASK | LPUART_FIFO_RXEMPT_MASK | LPUART_FIFO_TXOF_MASK | LPUART_FIFO_RXUF_MASK)) >>
            16U;
#endif
    /* Only keeps the status bits */
    temp &= (uint32_t)kLPUART_AllFlags;
    return temp;
}

/*!
 * brief Clears status flags with a provided mask.
 *
 * This function clears LPUART status flags with a provided mask. Automatically cleared flags
 * can't be cleared by this function.
 * Flags that can only cleared or set by hardware are:
 *    kLPUART_TxDataRegEmptyFlag, kLPUART_TransmissionCompleteFlag, kLPUART_RxDataRegFullFlag,
 *    kLPUART_RxActiveFlag, kLPUART_NoiseErrorInRxDataRegFlag, kLPUART_ParityErrorInRxDataRegFlag,
 *    kLPUART_TxFifoEmptyFlag,kLPUART_RxFifoEmptyFlag
 * Note: This API should be called when the Tx/Rx is idle, otherwise it takes no effects.
 *
 * param base LPUART peripheral base address.
 * param mask the status flags to be cleared. The user can use the enumerators in the
 *  _lpuart_status_flag_t to do the OR operation and get the mask.
 * return 0 succeed, others failed.
 * retval kStatus_LPUART_FlagCannotClearManually The flag can't be cleared by this function but
 *         it is cleared automatically by hardware.
 * retval kStatus_Success Status in the mask are cleared.
 */
status_t LPUART_ClearStatusFlags(LPUART_Type *base, uint32_t mask)
{
    uint32_t temp;
    status_t status;

    /* Only deal with the clearable flags */
    mask &= (uint32_t)kLPUART_AllClearFlags;

#if defined(FSL_FEATURE_LPUART_HAS_MCR) && FSL_FEATURE_LPUART_HAS_MCR
    /* Modem status */
    base->MSR = ((mask >> 2U) & 0xFUL);
#endif
#if defined(FSL_FEATURE_LPUART_HAS_TIMEOUT) && FSL_FEATURE_LPUART_HAS_TIMEOUT
    /* Timeout status */
    base->TOSR = ((mask >> 2U) & 0xF00UL);
#endif
#if defined(FSL_FEATURE_LPUART_HAS_FIFO) && FSL_FEATURE_LPUART_HAS_FIFO
    /* Status bits in FIFO register */
    if ((mask & ((uint32_t)kLPUART_TxFifoOverflowFlag | (uint32_t)kLPUART_RxFifoUnderflowFlag)) != 0U)
    {
        /* Get the FIFO register value and mask the rx/tx FIFO flush bits and the status bits that can be W1C in case
           they are written 1 accidentally. */
        temp = (uint32_t)base->FIFO;
        temp &= (uint32_t)(~(LPUART_FIFO_TXFLUSH_MASK | LPUART_FIFO_RXFLUSH_MASK | LPUART_FIFO_TXOF_MASK |
                             LPUART_FIFO_RXUF_MASK));
        temp |= (mask << 16U) & (LPUART_FIFO_TXOF_MASK | LPUART_FIFO_RXUF_MASK);
        base->FIFO = temp;
    }
#endif
    /* Status bits in STAT register */
    /* First get the STAT register value and mask all the bits that not represent status, then OR with the status bit
     * that is to be W1C */
    temp       = (base->STAT & 0x3E000000UL) | mask;
    base->STAT = temp;
    /* If some flags still pending. */
    if (0U != (mask & LPUART_GetStatusFlags(base)))
    {
        status = kStatus_LPUART_FlagCannotClearManually;
    }
    else
    {
        status = kStatus_Success;
    }

    return status;
}

/*!
 * brief Writes to the transmitter register using a blocking method.
 *
 * This function polls the transmitter register, first waits for the register to be empty or TX FIFO to have room,
 * and writes data to the transmitter buffer, then waits for the data to be sent out to bus.
 *
 * param base LPUART peripheral base address.
 * param data Start address of the data to write.
 * param length Size of the data to write.
 * retval kStatus_LPUART_Timeout Transmission timed out and was aborted.
 * retval kStatus_Success Successfully wrote all data.
 */
status_t LPUART_WriteBlocking(LPUART_Type *base, const uint8_t *data, size_t length)
{
    assert(NULL != data);

    const uint8_t *dataAddress = data;
    size_t transferSize        = length;

#if UART_RETRY_TIMES
    uint32_t waitTimes;
#endif

    while (0U != transferSize)
    {
#if UART_RETRY_TIMES
        waitTimes = UART_RETRY_TIMES;
        while ((0U == (base->STAT & LPUART_STAT_TDRE_MASK)) && (0U != --waitTimes))
#else
        while (0U == (base->STAT & LPUART_STAT_TDRE_MASK))
#endif
        {
        }
#if UART_RETRY_TIMES
        if (0U == waitTimes)
        {
            return kStatus_LPUART_Timeout;
        }
#endif
        base->DATA = *(dataAddress);
        dataAddress++;
        transferSize--;
    }
    /* Ensure all the data in the transmit buffer are sent out to bus. */
#if UART_RETRY_TIMES
    waitTimes = UART_RETRY_TIMES;
    while ((0U == (base->STAT & LPUART_STAT_TC_MASK)) && (0U != --waitTimes))
#else
    while (0U == (base->STAT & LPUART_STAT_TC_MASK))
#endif
    {
    }
#if UART_RETRY_TIMES
    if (0U == waitTimes)
    {
        return kStatus_LPUART_Timeout;
    }
#endif
    return kStatus_Success;
}

/*!
 * brief Writes to the transmitter register using a blocking method in 9bit or 10bit mode.
 *
 * note This function only support 9bit or 10bit transfer.
 *       Please make sure only 10bit of data is valid and other bits are 0.
 *
 * param base LPUART peripheral base address.
 * param data Start address of the data to write.
 * param length Size of the data to write.
 * retval kStatus_LPUART_Timeout Transmission timed out and was aborted.
 * retval kStatus_Success Successfully wrote all data.
 */
status_t LPUART_WriteBlocking16bit(LPUART_Type *base, const uint16_t *data, size_t length)
{
    assert(NULL != data);

    const uint16_t *dataAddress = data;
    size_t transferSize         = length;

#if UART_RETRY_TIMES
    uint32_t waitTimes;
#endif

    while (0U != transferSize)
    {
#if UART_RETRY_TIMES
        waitTimes = UART_RETRY_TIMES;
        while ((0U == (base->STAT & LPUART_STAT_TDRE_MASK)) && (0U != --waitTimes))
#else
        while (0U == (base->STAT & LPUART_STAT_TDRE_MASK))
#endif
        {
        }
#if UART_RETRY_TIMES
        if (0U == waitTimes)
        {
            return kStatus_LPUART_Timeout;
        }
#endif
        base->DATA = *(dataAddress);
        dataAddress++;
        transferSize--;
    }
    /* Ensure all the data in the transmit buffer are sent out to bus. */
#if UART_RETRY_TIMES
    waitTimes = UART_RETRY_TIMES;
    while ((0U == (base->STAT & LPUART_STAT_TC_MASK)) && (0U != --waitTimes))
#else
    while (0U == (base->STAT & LPUART_STAT_TC_MASK))
#endif
    {
    }
#if UART_RETRY_TIMES
    if (0U == waitTimes)
    {
        return kStatus_LPUART_Timeout;
    }
#endif
    return kStatus_Success;
}

/*!
 * brief Reads the receiver data register using a blocking method.
 *
 * This function polls the receiver register, waits for the receiver register full or receiver FIFO
 * has data, and reads data from the TX register.
 *
 * param base LPUART peripheral base address.
 * param data Start address of the buffer to store the received data.
 * param length Size of the buffer.
 * retval kStatus_LPUART_RxHardwareOverrun Receiver overrun happened while receiving data.
 * retval kStatus_LPUART_NoiseError Noise error happened while receiving data.
 * retval kStatus_LPUART_FramingError Framing error happened while receiving data.
 * retval kStatus_LPUART_ParityError Parity error happened while receiving data.
 * retval kStatus_LPUART_Timeout Transmission timed out and was aborted.
 * retval kStatus_Success Successfully received all data.
 */
status_t LPUART_ReadBlocking(LPUART_Type *base, uint8_t *data, size_t length)
{
    assert(NULL != data);

    status_t status = kStatus_Success;
    uint32_t statusFlag;
    uint8_t *dataAddress = data;

#if defined(FSL_FEATURE_LPUART_HAS_7BIT_DATA_SUPPORT) && FSL_FEATURE_LPUART_HAS_7BIT_DATA_SUPPORT
    uint32_t ctrl        = base->CTRL;
    bool isSevenDataBits = (((ctrl & LPUART_CTRL_M7_MASK) != 0U) ||
                            (((ctrl & LPUART_CTRL_M_MASK) == 0U) && ((ctrl & LPUART_CTRL_PE_MASK) != 0U)));
#endif

#if UART_RETRY_TIMES
    uint32_t waitTimes;
#endif

    while (0U != (length--))
    {
#if UART_RETRY_TIMES
        waitTimes = UART_RETRY_TIMES;
#endif
#if defined(FSL_FEATURE_LPUART_HAS_FIFO) && FSL_FEATURE_LPUART_HAS_FIFO
        while (0U == ((base->WATER & LPUART_WATER_RXCOUNT_MASK) >> LPUART_WATER_RXCOUNT_SHIFT))
#else
        while (0U == (base->STAT & LPUART_STAT_RDRF_MASK))
#endif
        {
#if UART_RETRY_TIMES
            if (0U == --waitTimes)
            {
                status = kStatus_LPUART_Timeout;
                break;
            }
#endif
            statusFlag = LPUART_GetStatusFlags(base);

            if (0U != (statusFlag & (uint32_t)kLPUART_RxOverrunFlag))
            {
                status = ((kStatus_Success == LPUART_ClearStatusFlags(base, (uint32_t)kLPUART_RxOverrunFlag)) ?
                              (kStatus_LPUART_RxHardwareOverrun) :
                              (kStatus_LPUART_FlagCannotClearManually));
                /* Other error flags(FE, NF, and PF) are prevented from setting once OR is set, no need to check other
                 * error flags*/
                break;
            }

            if (0U != (statusFlag & (uint32_t)kLPUART_ParityErrorFlag))
            {
                status = ((kStatus_Success == LPUART_ClearStatusFlags(base, (uint32_t)kLPUART_ParityErrorFlag)) ?
                              (kStatus_LPUART_ParityError) :
                              (kStatus_LPUART_FlagCannotClearManually));
            }

            if (0U != (statusFlag & (uint32_t)kLPUART_FramingErrorFlag))
            {
                status = ((kStatus_Success == LPUART_ClearStatusFlags(base, (uint32_t)kLPUART_FramingErrorFlag)) ?
                              (kStatus_LPUART_FramingError) :
                              (kStatus_LPUART_FlagCannotClearManually));
            }

            if (0U != (statusFlag & (uint32_t)kLPUART_NoiseErrorFlag))
            {
                status = ((kStatus_Success == LPUART_ClearStatusFlags(base, (uint32_t)kLPUART_NoiseErrorFlag)) ?
                              (kStatus_LPUART_NoiseError) :
                              (kStatus_LPUART_FlagCannotClearManually));
            }
            if (kStatus_Success != status)
            {
                break;
            }
        }

        if (kStatus_Success == status)
        {
#if defined(FSL_FEATURE_LPUART_HAS_7BIT_DATA_SUPPORT) && FSL_FEATURE_LPUART_HAS_7BIT_DATA_SUPPORT
            if (isSevenDataBits)
            {
                *(dataAddress) = (uint8_t)(base->DATA & 0x7FU);
                dataAddress++;
            }
            else
            {
                *(dataAddress) = (uint8_t)base->DATA;
                dataAddress++;
            }
#else
            *(dataAddress) = (uint8_t)base->DATA;
            dataAddress++;
#endif
        }
        else
        {
            break;
        }
    }

    return status;
}

/*!
 * brief Reads the receiver data register in 9bit or 10bit mode.
 *
 * note This function only support 9bit or 10bit transfer.
 *
 * param base LPUART peripheral base address.
 * param data Start address of the buffer to store the received data by 16bit, only 10bit is valid.
 * param length Size of the buffer.
 * retval kStatus_LPUART_RxHardwareOverrun Receiver overrun happened while receiving data.
 * retval kStatus_LPUART_NoiseError Noise error happened while receiving data.
 * retval kStatus_LPUART_FramingError Framing error happened while receiving data.
 * retval kStatus_LPUART_ParityError Parity error happened while receiving data.
 * retval kStatus_LPUART_Timeout Transmission timed out and was aborted.
 * retval kStatus_Success Successfully received all data.
 */
status_t LPUART_ReadBlocking16bit(LPUART_Type *base, uint16_t *data, size_t length)
{
    assert(NULL != data);

    status_t status = kStatus_Success;
    uint32_t statusFlag;
    uint16_t *dataAddress = data;

#if UART_RETRY_TIMES
    uint32_t waitTimes;
#endif

    while (0U != (length--))
    {
#if UART_RETRY_TIMES
        waitTimes = UART_RETRY_TIMES;
#endif
#if defined(FSL_FEATURE_LPUART_HAS_FIFO) && FSL_FEATURE_LPUART_HAS_FIFO
        while (0U == ((base->WATER & LPUART_WATER_RXCOUNT_MASK) >> LPUART_WATER_RXCOUNT_SHIFT))
#else
        while (0U == (base->STAT & LPUART_STAT_RDRF_MASK))
#endif
        {
#if UART_RETRY_TIMES
            if (0U == --waitTimes)
            {
                status = kStatus_LPUART_Timeout;
                break;
            }
#endif
            statusFlag = LPUART_GetStatusFlags(base);

            if (0U != (statusFlag & (uint32_t)kLPUART_RxOverrunFlag))
            {
                /*
                 * $Branch Coverage Justification$
                 * $ref fsl_lpuart_c_ref_2$.
                 */
                status = ((kStatus_Success == LPUART_ClearStatusFlags(base, (uint32_t)kLPUART_RxOverrunFlag)) ?
                              (kStatus_LPUART_RxHardwareOverrun) :
                              (kStatus_LPUART_FlagCannotClearManually));
                /* Other error flags(FE, NF, and PF) are prevented from setting once OR is set, no need to check other
                 * error flags*/
                break;
            }

            if (0U != (statusFlag & (uint32_t)kLPUART_ParityErrorFlag))
            {
                /*
                 * $Branch Coverage Justification$
                 * $ref fsl_lpuart_c_ref_2$.
                 */
                status = ((kStatus_Success == LPUART_ClearStatusFlags(base, (uint32_t)kLPUART_ParityErrorFlag)) ?
                              (kStatus_LPUART_ParityError) :
                              (kStatus_LPUART_FlagCannotClearManually));
            }

            if (0U != (statusFlag & (uint32_t)kLPUART_FramingErrorFlag))
            {
                /*
                 * $Branch Coverage Justification$
                 * $ref fsl_lpuart_c_ref_2$.
                 */
                status = ((kStatus_Success == LPUART_ClearStatusFlags(base, (uint32_t)kLPUART_FramingErrorFlag)) ?
                              (kStatus_LPUART_FramingError) :
                              (kStatus_LPUART_FlagCannotClearManually));
            }

            if (0U != (statusFlag & (uint32_t)kLPUART_NoiseErrorFlag))
            {
                /*
                 * $Branch Coverage Justification$
                 * $ref fsl_lpuart_c_ref_2$.
                 */
                status = ((kStatus_Success == LPUART_ClearStatusFlags(base, (uint32_t)kLPUART_NoiseErrorFlag)) ?
                              (kStatus_LPUART_NoiseError) :
                              (kStatus_LPUART_FlagCannotClearManually));
            }
            if (kStatus_Success != status)
            {
                break;
            }
        }
        if (kStatus_Success == status)
        {
            *(dataAddress) = (uint16_t)(base->DATA & 0x03FFU);
            dataAddress++;
        }
        else
        {
            break;
        }
    }

    return status;
}

/*!
 * brief Initializes the LPUART handle.
 *
 * This function initializes the LPUART handle, which can be used for other LPUART
 * transactional APIs. Usually, for a specified LPUART instance,
 * call this API once to get the initialized handle.
 *
 * The LPUART driver supports the "background" receiving, which means that user can set up
 * an RX ring buffer optionally. Data received is stored into the ring buffer even when the
 * user doesn't call the LPUART_TransferReceiveNonBlocking() API. If there is already data received
 * in the ring buffer, the user can get the received data from the ring buffer directly.
 * The ring buffer is disabled if passing NULL as p ringBuffer.
 *
 * param base LPUART peripheral base address.
 * param handle LPUART handle pointer.
 * param callback Callback function.
 * param userData User data.
 */
void LPUART_TransferCreateHandle(LPUART_Type *base,
                                 lpuart_handle_t *handle,
                                 lpuart_transfer_callback_t callback,
                                 void *userData)
{
    assert(NULL != handle);

    /* Get instance from peripheral base address. */
    uint32_t instance = LPUART_GetInstance(base);

    lpuart_to_lpflexcomm_t handler;
    handler.lpuart_handler = LPUART_TransferHandleIRQ;

#if defined(FSL_FEATURE_LPUART_HAS_7BIT_DATA_SUPPORT) && FSL_FEATURE_LPUART_HAS_7BIT_DATA_SUPPORT
    uint32_t ctrl        = base->CTRL;
    bool isSevenDataBits = (((ctrl & LPUART_CTRL_M7_MASK) != 0U) ||
                            (((ctrl & LPUART_CTRL_M_MASK) == 0U) && ((ctrl & LPUART_CTRL_PE_MASK) != 0U)));
#endif

    /* Zero the handle. */
    (void)memset(handle, 0, sizeof(lpuart_handle_t));

    /* Set the TX/RX state. */
    handle->rxState = (uint8_t)kLPUART_RxIdle;
    handle->txState = (uint8_t)kLPUART_TxIdle;

    /* Set the callback and user data. */
    handle->callback = callback;
    handle->userData = userData;

#if defined(FSL_FEATURE_LPUART_HAS_7BIT_DATA_SUPPORT) && FSL_FEATURE_LPUART_HAS_7BIT_DATA_SUPPORT
    /* Initial seven data bits flag */
    handle->isSevenDataBits = isSevenDataBits;
#endif
    handle->is16bitData = false;

    /* Save the handle in global variables to support the double weak mechanism. */
    LP_FLEXCOMM_SetIRQHandler(LPUART_GetInstance(base), handler.lpflexcomm_handler, handle, LP_FLEXCOMM_PERIPH_LPUART);

    /* Enable interrupt in NVIC. */
    (void)EnableIRQ(s_lpuartIRQ[instance]);
}

/*!
 * brief Sets up the RX ring buffer.
 *
 * This function sets up the RX ring buffer to a specific UART handle.
 *
 * When the RX ring buffer is used, data received is stored into the ring buffer even when
 * the user doesn't call the UART_TransferReceiveNonBlocking() API. If there is already data received
 * in the ring buffer, the user can get the received data from the ring buffer directly.
 *
 * note When using RX ring buffer, one byte is reserved for internal use. In other
 * words, if p ringBufferSize is 32, then only 31 bytes are used for saving data.
 *
 * param base LPUART peripheral base address.
 * param handle LPUART handle pointer.
 * param ringBuffer Start address of ring buffer for background receiving. Pass NULL to disable the ring buffer.
 * param ringBufferSize size of the ring buffer.
 */
void LPUART_TransferStartRingBuffer(LPUART_Type *base,
                                    lpuart_handle_t *handle,
                                    uint8_t *ringBuffer,
                                    size_t ringBufferSize)
{
    assert(NULL != handle);
    assert(NULL != ringBuffer);

    /* Setup the ring buffer address */
    handle->rxRingBuffer = ringBuffer;
    if (!handle->is16bitData)
    {
        handle->rxRingBufferSize = ringBufferSize;
    }
    else
    {
        handle->rxRingBufferSize = ringBufferSize / 2U;
    }
    handle->rxRingBufferHead = 0U;
    handle->rxRingBufferTail = 0U;

    /* Disable and re-enable the global interrupt to protect the interrupt enable register during read-modify-wrte. */
    uint32_t irqMask = DisableGlobalIRQ();
    /* Enable the interrupt to accept the data when user need the ring buffer. */
    base->CTRL |= (uint32_t)(LPUART_CTRL_RIE_MASK | LPUART_CTRL_ORIE_MASK);
    EnableGlobalIRQ(irqMask);
}

/*!
 * brief Aborts the background transfer and uninstalls the ring buffer.
 *
 * This function aborts the background transfer and uninstalls the ring buffer.
 *
 * param base LPUART peripheral base address.
 * param handle LPUART handle pointer.
 */
void LPUART_TransferStopRingBuffer(LPUART_Type *base, lpuart_handle_t *handle)
{
    assert(NULL != handle);

    if (handle->rxState == (uint8_t)kLPUART_RxIdle)
    {
        /* Disable and re-enable the global interrupt to protect the interrupt enable register during read-modify-wrte.
         */
        uint32_t irqMask = DisableGlobalIRQ();
        base->CTRL &= ~(uint32_t)(LPUART_CTRL_RIE_MASK | LPUART_CTRL_ORIE_MASK);
        EnableGlobalIRQ(irqMask);
    }

    handle->rxRingBuffer     = NULL;
    handle->rxRingBufferSize = 0U;
    handle->rxRingBufferHead = 0U;
    handle->rxRingBufferTail = 0U;
}

/*!
 * brief Transmits a buffer of data using the interrupt method.
 *
 * This function send data using an interrupt method. This is a non-blocking function, which
 * returns directly without waiting for all data written to the transmitter register. When
 * all data is written to the TX register in the ISR, the LPUART driver calls the callback
 * function and passes the ref kStatus_LPUART_TxIdle as status parameter.
 *
 * note The kStatus_LPUART_TxIdle is passed to the upper layer when all data are written
 * to the TX register. However, there is no check to ensure that all the data sent out. Before disabling the TX,
 * check the kLPUART_TransmissionCompleteFlag to ensure that the transmit is finished.
 *
 * param base LPUART peripheral base address.
 * param handle LPUART handle pointer.
 * param xfer LPUART transfer structure, see #lpuart_transfer_t.
 * retval kStatus_Success Successfully start the data transmission.
 * retval kStatus_LPUART_TxBusy Previous transmission still not finished, data not all written to the TX register.
 * retval kStatus_InvalidArgument Invalid argument.
 */
status_t LPUART_TransferSendNonBlocking(LPUART_Type *base, lpuart_handle_t *handle, lpuart_transfer_t *xfer)
{
    assert(NULL != handle);
    assert(NULL != xfer);
    assert(NULL != xfer->txData);
    assert(0U != xfer->dataSize);

    status_t status;

    /* Return error if current TX busy. */
    if ((uint8_t)kLPUART_TxBusy == handle->txState)
    {
        status = kStatus_LPUART_TxBusy;
    }
    else
    {
        if (!handle->is16bitData)
        {
            handle->txData = xfer->txData;
        }
        else
        {
            handle->txData16 = xfer->txData16;
        }
        handle->txDataSize    = xfer->dataSize;
        handle->txDataSizeAll = xfer->dataSize;
        handle->txState       = (uint8_t)kLPUART_TxBusy;

        /* Disable and re-enable the global interrupt to protect the interrupt enable register during read-modify-wrte.
         */
        uint32_t irqMask = DisableGlobalIRQ();
        /* Enable transmitter interrupt. */
        base->CTRL |= (uint32_t)LPUART_CTRL_TIE_MASK;
        EnableGlobalIRQ(irqMask);

        status = kStatus_Success;
    }

    return status;
}

/*!
 * brief Aborts the interrupt-driven data transmit.
 *
 * This function aborts the interrupt driven data sending. The user can get the remainBtyes to find out
 * how many bytes are not sent out.
 *
 * param base LPUART peripheral base address.
 * param handle LPUART handle pointer.
 */
void LPUART_TransferAbortSend(LPUART_Type *base, lpuart_handle_t *handle)
{
    assert(NULL != handle);

    /* Disable and re-enable the global interrupt to protect the interrupt enable register during read-modify-wrte. */
    uint32_t irqMask = DisableGlobalIRQ();
    base->CTRL &= ~(uint32_t)(LPUART_CTRL_TIE_MASK | LPUART_CTRL_TCIE_MASK);
    EnableGlobalIRQ(irqMask);

    handle->txDataSize = 0;
    handle->txState    = (uint8_t)kLPUART_TxIdle;
}

/*!
 * brief Gets the number of bytes that have been sent out to bus.
 *
 * This function gets the number of bytes that have been sent out to bus by an interrupt method.
 *
 * param base LPUART peripheral base address.
 * param handle LPUART handle pointer.
 * param count Send bytes count.
 * retval kStatus_NoTransferInProgress No send in progress.
 * retval kStatus_InvalidArgument Parameter is invalid.
 * retval kStatus_Success Get successfully through the parameter \p count;
 */
status_t LPUART_TransferGetSendCount(LPUART_Type *base, lpuart_handle_t *handle, uint32_t *count)
{
    assert(NULL != handle);
    assert(NULL != count);

    status_t status      = kStatus_Success;
    size_t tmptxDataSize = handle->txDataSize;

    if ((uint8_t)kLPUART_TxIdle == handle->txState)
    {
        status = kStatus_NoTransferInProgress;
    }
    else
    {
#if defined(FSL_FEATURE_LPUART_HAS_FIFO) && FSL_FEATURE_LPUART_HAS_FIFO
        *count = handle->txDataSizeAll - tmptxDataSize -
                 ((base->WATER & LPUART_WATER_TXCOUNT_MASK) >> LPUART_WATER_TXCOUNT_SHIFT);
#else
        if ((base->STAT & (uint32_t)kLPUART_TxDataRegEmptyFlag) != 0U)
        {
            *count = handle->txDataSizeAll - tmptxDataSize;
        }
        else
        {
            *count = handle->txDataSizeAll - tmptxDataSize - 1U;
        }
#endif
    }

    return status;
}

/*!
 * brief Receives a buffer of data using the interrupt method.
 *
 * This function receives data using an interrupt method. This is a non-blocking function
 * which returns without waiting to ensure that all data are received.
 * If the RX ring buffer is used and not empty, the data in the ring buffer is copied and
 * the parameter p receivedBytes shows how many bytes are copied from the ring buffer.
 * After copying, if the data in the ring buffer is not enough for read, the receive
 * request is saved by the LPUART driver. When the new data arrives, the receive request
 * is serviced first. When all data is received, the LPUART driver notifies the upper layer
 * through a callback function and passes a status parameter ref kStatus_UART_RxIdle.
 * For example, the upper layer needs 10 bytes but there are only 5 bytes in ring buffer.
 * The 5 bytes are copied to xfer->data, which returns with the
 * parameter p receivedBytes set to 5. For the remaining 5 bytes, the newly arrived data is
 * saved from xfer->data[5]. When 5 bytes are received, the LPUART driver notifies the upper layer.
 * If the RX ring buffer is not enabled, this function enables the RX and RX interrupt
 * to receive data to xfer->data. When all data is received, the upper layer is notified.
 *
 * param base LPUART peripheral base address.
 * param handle LPUART handle pointer.
 * param xfer LPUART transfer structure, see #uart_transfer_t.
 * param receivedBytes Bytes received from the ring buffer directly.
 * retval kStatus_Success Successfully queue the transfer into the transmit queue.
 * retval kStatus_LPUART_RxBusy Previous receive request is not finished.
 * retval kStatus_InvalidArgument Invalid argument.
 */
status_t LPUART_TransferReceiveNonBlocking(LPUART_Type *base,
                                           lpuart_handle_t *handle,
                                           lpuart_transfer_t *xfer,
                                           size_t *receivedBytes)
{
    assert(NULL != handle);
    assert(NULL != xfer);
    assert(NULL != xfer->rxData);
    assert(0U != xfer->dataSize);

    uint32_t i;
    status_t status;
    uint32_t irqMask;
    /* How many bytes to copy from ring buffer to user memory. */
    size_t bytesToCopy = 0U;
    /* How many bytes to receive. */
    size_t bytesToReceive;
    /* How many bytes currently have received. */
    size_t bytesCurrentReceived;

    /* How to get data:
       1. If RX ring buffer is not enabled, then save xfer->data and xfer->dataSize
          to lpuart handle, enable interrupt to store received data to xfer->data. When
          all data received, trigger callback.
       2. If RX ring buffer is enabled and not empty, get data from ring buffer first.
          If there are enough data in ring buffer, copy them to xfer->data and return.
          If there are not enough data in ring buffer, copy all of them to xfer->data,
          save the xfer->data remained empty space to lpuart handle, receive data
          to this empty space and trigger callback when finished. */

    if ((uint8_t)kLPUART_RxBusy == handle->rxState)
    {
        status = kStatus_LPUART_RxBusy;
    }
    else
    {
        bytesToReceive       = xfer->dataSize;
        bytesCurrentReceived = 0;

        /* If RX ring buffer is used. */
        if (NULL != handle->rxRingBuffer)
        {
            /* Disable and re-enable the global interrupt to protect the interrupt enable register during
             * read-modify-wrte. */
            irqMask = DisableGlobalIRQ();
            /* Disable LPUART RX IRQ, protect ring buffer. */
            base->CTRL &= ~(uint32_t)(LPUART_CTRL_RIE_MASK | LPUART_CTRL_ORIE_MASK);
            EnableGlobalIRQ(irqMask);

            /* How many bytes in RX ring buffer currently. */
            bytesToCopy = LPUART_TransferGetRxRingBufferLength(base, handle);

            if (0U != bytesToCopy)
            {
                bytesToCopy = MIN(bytesToReceive, bytesToCopy);

                bytesToReceive -= bytesToCopy;

                /* Copy data from ring buffer to user memory. */
                for (i = 0U; i < bytesToCopy; i++)
                {
                    if (!handle->is16bitData)
                    {
                        xfer->rxData[bytesCurrentReceived] = handle->rxRingBuffer[handle->rxRingBufferTail];
                    }
                    else
                    {
                        xfer->rxData16[bytesCurrentReceived] = handle->rxRingBuffer16[handle->rxRingBufferTail];
                    }
                    bytesCurrentReceived++;

                    /* Wrap to 0. Not use modulo (%) because it might be large and slow. */
                    if (((uint32_t)handle->rxRingBufferTail + 1U) == handle->rxRingBufferSize)
                    {
                        handle->rxRingBufferTail = 0U;
                    }
                    else
                    {
                        handle->rxRingBufferTail++;
                    }
                }
            }

            /* If ring buffer does not have enough data, still need to read more data. */
            if (0U != bytesToReceive)
            {
                /* No data in ring buffer, save the request to LPUART handle. */
                if (!handle->is16bitData)
                {
                    handle->rxData = &xfer->rxData[bytesCurrentReceived];
                }
                else
                {
                    handle->rxData16 = &xfer->rxData16[bytesCurrentReceived];
                }
                handle->rxDataSize    = bytesToReceive;
                handle->rxDataSizeAll = xfer->dataSize;
                handle->rxState       = (uint8_t)kLPUART_RxBusy;
            }

            /* Disable and re-enable the global interrupt to protect the interrupt enable register during
             * read-modify-wrte. */
            irqMask = DisableGlobalIRQ();
            /* Re-enable LPUART RX IRQ. */
            base->CTRL |= (uint32_t)(LPUART_CTRL_RIE_MASK | LPUART_CTRL_ORIE_MASK);
            EnableGlobalIRQ(irqMask);

            /* Call user callback since all data are received. */
            if (0U == bytesToReceive)
            {
                if (NULL != handle->callback)
                {
                    handle->callback(base, handle, kStatus_LPUART_RxIdle, handle->userData);
                }
            }
        }
        /* Ring buffer not used. */
        else
        {
            if (!handle->is16bitData)
            {
                handle->rxData = &xfer->rxData[bytesCurrentReceived];
            }
            else
            {
                handle->rxData16 = &xfer->rxData16[bytesCurrentReceived];
            }
            handle->rxDataSize    = bytesToReceive;
            handle->rxDataSizeAll = bytesToReceive;
            handle->rxState       = (uint8_t)kLPUART_RxBusy;

            /* Disable and re-enable the global interrupt to protect the interrupt enable register during
             * read-modify-wrte. */
            irqMask = DisableGlobalIRQ();
            /* Enable RX interrupt. */
            base->CTRL |= (uint32_t)(LPUART_CTRL_RIE_MASK | LPUART_CTRL_ILIE_MASK | LPUART_CTRL_ORIE_MASK);
            EnableGlobalIRQ(irqMask);
        }

        /* Return the how many bytes have read. */
        if (NULL != receivedBytes)
        {
            *receivedBytes = bytesCurrentReceived;
        }

        status = kStatus_Success;
    }

    return status;
}

/*!
 * brief Aborts the interrupt-driven data receiving.
 *
 * This function aborts the interrupt-driven data receiving. The user can get the remainBytes to find out
 * how many bytes not received yet.
 *
 * param base LPUART peripheral base address.
 * param handle LPUART handle pointer.
 */
void LPUART_TransferAbortReceive(LPUART_Type *base, lpuart_handle_t *handle)
{
    assert(NULL != handle);

    /* Only abort the receive to handle->rxData, the RX ring buffer is still working. */
    if (NULL == handle->rxRingBuffer)
    {
        /* Disable and re-enable the global interrupt to protect the interrupt enable register during read-modify-wrte.
         */
        uint32_t irqMask = DisableGlobalIRQ();
        /* Disable RX interrupt. */
        base->CTRL &= ~(uint32_t)(LPUART_CTRL_RIE_MASK | LPUART_CTRL_ILIE_MASK | LPUART_CTRL_ORIE_MASK);
        EnableGlobalIRQ(irqMask);
    }

    handle->rxDataSize = 0U;
    handle->rxState    = (uint8_t)kLPUART_RxIdle;
}

/*!
 * brief Gets the number of bytes that have been received.
 *
 * This function gets the number of bytes that have been received.
 *
 * param base LPUART peripheral base address.
 * param handle LPUART handle pointer.
 * param count Receive bytes count.
 * retval kStatus_NoTransferInProgress No receive in progress.
 * retval kStatus_InvalidArgument Parameter is invalid.
 * retval kStatus_Success Get successfully through the parameter \p count;
 */
status_t LPUART_TransferGetReceiveCount(LPUART_Type *base, lpuart_handle_t *handle, uint32_t *count)
{
    assert(NULL != handle);
    assert(NULL != count);

    status_t status      = kStatus_Success;
    size_t tmprxDataSize = handle->rxDataSize;

    if ((uint8_t)kLPUART_RxIdle == handle->rxState)
    {
        status = kStatus_NoTransferInProgress;
    }
    else
    {
        *count = handle->rxDataSizeAll - tmprxDataSize;
    }

    return status;
}

/*!
 * brief LPUART IRQ handle function.
 *
 * This function handles the LPUART transmit and receive IRQ request.
 *
 * param instance LPUART instance.
 * param irqHandle LPUART handle pointer.
 */
void LPUART_TransferHandleIRQ(uint32_t instance, void *irqHandle)
{
    assert(NULL != irqHandle);
    assert(instance < ARRAY_SIZE(s_lpuartBases));
    LPUART_Type *base = s_lpuartBases[instance];
    uint8_t count;
    uint8_t tempCount;
    uint32_t status            = LPUART_GetStatusFlags(base);
    uint32_t enabledInterrupts = LPUART_GetEnabledInterrupts(base);
    uint16_t tpmRxRingBufferHead;
    uint32_t tpmData;
    uint32_t irqMask;
    lpuart_handle_t *handle = (lpuart_handle_t *)irqHandle;

    /* If RX overrun. */
    if ((uint32_t)kLPUART_RxOverrunFlag == ((uint32_t)kLPUART_RxOverrunFlag & status))
    {
        /* Clear overrun flag, otherwise the RX does not work. */
        base->STAT = ((base->STAT & 0x3FE00000U) | LPUART_STAT_OR_MASK);

        /* Trigger callback. */
        if (NULL != (handle->callback))
        {
            handle->callback(base, handle, kStatus_LPUART_RxHardwareOverrun, handle->userData);
        }
    }

    /* If IDLE flag is set and the IDLE interrupt is enabled. */
    if ((0U != ((uint32_t)kLPUART_IdleLineFlag & status)) &&
        (0U != ((uint32_t)kLPUART_IdleLineInterruptEnable & enabledInterrupts)))
    {
#if defined(FSL_FEATURE_LPUART_HAS_FIFO) && FSL_FEATURE_LPUART_HAS_FIFO
        count = ((uint8_t)((base->WATER & LPUART_WATER_RXCOUNT_MASK) >> LPUART_WATER_RXCOUNT_SHIFT));

        while ((0U != handle->rxDataSize) && (0U != count))
        {
            tempCount = (uint8_t)MIN(handle->rxDataSize, count);

            /* Using non block API to read the data from the registers. */
            if (!handle->is16bitData)
            {
                LPUART_ReadNonBlocking(base, handle->rxData, tempCount);
                handle->rxData = &handle->rxData[tempCount];
            }
            else
            {
                LPUART_ReadNonBlocking16bit(base, handle->rxData16, tempCount);
                handle->rxData16 = &handle->rxData16[tempCount];
            }
            handle->rxDataSize -= tempCount;
            count -= tempCount;

            /* If rxDataSize is 0, invoke rx idle callback.*/
            if (0U == (handle->rxDataSize))
            {
                handle->rxState = (uint8_t)kLPUART_RxIdle;

                if (NULL != handle->callback)
                {
                    handle->callback(base, handle, kStatus_LPUART_RxIdle, handle->userData);
                }
            }
        }
#endif
        /* Clear IDLE flag.*/
        base->STAT = ((base->STAT & 0x3FE00000U) | LPUART_STAT_IDLE_MASK);

        /* If rxDataSize is 0, disable rx ready, overrun and idle line interrupt.*/
        if (0U == handle->rxDataSize)
        {
            /* Disable and re-enable the global interrupt to protect the interrupt enable register during
             * read-modify-wrte. */
            irqMask = DisableGlobalIRQ();
            base->CTRL &= ~(uint32_t)(LPUART_CTRL_RIE_MASK | LPUART_CTRL_ILIE_MASK | LPUART_CTRL_ORIE_MASK);
            EnableGlobalIRQ(irqMask);
        }
        /* Invoke callback if callback is not NULL and rxDataSize is not 0. */
        else if (NULL != handle->callback)
        {
            handle->callback(base, handle, kStatus_LPUART_IdleLineDetected, handle->userData);
        }
        else
        {
            /* Avoid MISRA 15.7 */
        }
    }
    /* Receive data register full */
    if ((0U != ((uint32_t)kLPUART_RxDataRegFullFlag & status)) &&
        (0U != ((uint32_t)kLPUART_RxDataRegFullInterruptEnable & enabledInterrupts)))
    {
        /* Get the size that can be stored into buffer for this interrupt. */
#if defined(FSL_FEATURE_LPUART_HAS_FIFO) && FSL_FEATURE_LPUART_HAS_FIFO
        count = ((uint8_t)((base->WATER & LPUART_WATER_RXCOUNT_MASK) >> LPUART_WATER_RXCOUNT_SHIFT));
#else
        count = 1;
#endif

        /* If handle->rxDataSize is not 0, first save data to handle->rxData. */
        while ((0U != handle->rxDataSize) && (0U != count))
        {
#if defined(FSL_FEATURE_LPUART_HAS_FIFO) && FSL_FEATURE_LPUART_HAS_FIFO
            tempCount = (uint8_t)MIN(handle->rxDataSize, count);
#else
            tempCount = 1;
#endif

            /* Using non block API to read the data from the registers. */
            if (!handle->is16bitData)
            {
                LPUART_ReadNonBlocking(base, handle->rxData, tempCount);
                handle->rxData = &handle->rxData[tempCount];
            }
            else
            {
                LPUART_ReadNonBlocking16bit(base, handle->rxData16, tempCount);
                handle->rxData16 = &handle->rxData16[tempCount];
            }
            handle->rxDataSize -= tempCount;
            count -= tempCount;

            /* If all the data required for upper layer is ready, trigger callback. */
            if (0U == handle->rxDataSize)
            {
                handle->rxState = (uint8_t)kLPUART_RxIdle;

                if (NULL != handle->callback)
                {
                    handle->callback(base, handle, kStatus_LPUART_RxIdle, handle->userData);
                }
            }
        }

        /* If use RX ring buffer, receive data to ring buffer. */
        if (NULL != handle->rxRingBuffer)
        {
            while (0U != count--)
            {
                /* If RX ring buffer is full, trigger callback to notify over run. */
                if (LPUART_TransferIsRxRingBufferFull(base, handle))
                {
                    if (NULL != handle->callback)
                    {
                        handle->callback(base, handle, kStatus_LPUART_RxRingBufferOverrun, handle->userData);
                    }
                }

                /* If ring buffer is still full after callback function, the oldest data is overridden. */
                if (LPUART_TransferIsRxRingBufferFull(base, handle))
                {
                    /* Increase handle->rxRingBufferTail to make room for new data. */
                    if (((uint32_t)handle->rxRingBufferTail + 1U) == handle->rxRingBufferSize)
                    {
                        handle->rxRingBufferTail = 0U;
                    }
                    else
                    {
                        handle->rxRingBufferTail++;
                    }
                }

                /* Read data. */
                tpmRxRingBufferHead = handle->rxRingBufferHead;
                tpmData             = base->DATA;
#if defined(FSL_FEATURE_LPUART_HAS_7BIT_DATA_SUPPORT) && FSL_FEATURE_LPUART_HAS_7BIT_DATA_SUPPORT
                if (handle->isSevenDataBits)
                {
                    handle->rxRingBuffer[tpmRxRingBufferHead] = (uint8_t)(tpmData & 0x7FU);
                }
                else
                {
                    if (!handle->is16bitData)
                    {
                        handle->rxRingBuffer[tpmRxRingBufferHead] = (uint8_t)tpmData;
                    }
                    else
                    {
                        handle->rxRingBuffer16[tpmRxRingBufferHead] = (uint16_t)(tpmData & 0x3FFU);
                    }
                }
#else
                if (!handle->is16bitData)
                {
                    handle->rxRingBuffer[tpmRxRingBufferHead] = (uint8_t)tpmData;
                }
                else
                {
                    handle->rxRingBuffer16[tpmRxRingBufferHead] = (uint16_t)(tpmData & 0x3FFU);
                }
#endif

                /* Increase handle->rxRingBufferHead. */
                if (((uint32_t)handle->rxRingBufferHead + 1U) == handle->rxRingBufferSize)
                {
                    handle->rxRingBufferHead = 0U;
                }
                else
                {
                    handle->rxRingBufferHead++;
                }
            }
        }
        /* If no receive requst pending, stop RX interrupt. */
        else if (0U == handle->rxDataSize)
        {
            /* Disable and re-enable the global interrupt to protect the interrupt enable register during
             * read-modify-wrte. */
            irqMask = DisableGlobalIRQ();
            base->CTRL &= ~(uint32_t)(LPUART_CTRL_RIE_MASK | LPUART_CTRL_ORIE_MASK | LPUART_CTRL_ILIE_MASK);
            EnableGlobalIRQ(irqMask);
        }
        else
        {
        }
    }

    /* Send data register empty and the interrupt is enabled. */
    if ((0U != ((uint32_t)kLPUART_TxDataRegEmptyFlag & status)) &&
        (0U != ((uint32_t)kLPUART_TxDataRegEmptyInterruptEnable & enabledInterrupts)))
    {
/* Get the bytes that available at this moment. */
#if defined(FSL_FEATURE_LPUART_HAS_FIFO) && FSL_FEATURE_LPUART_HAS_FIFO
        count = (uint8_t)FSL_FEATURE_LPUART_FIFO_SIZEn(base) -
                (uint8_t)((base->WATER & LPUART_WATER_TXCOUNT_MASK) >> LPUART_WATER_TXCOUNT_SHIFT);
#else
        count = 1;
#endif

        while ((0U != handle->txDataSize) && (0U != count))
        {
#if defined(FSL_FEATURE_LPUART_HAS_FIFO) && FSL_FEATURE_LPUART_HAS_FIFO
            tempCount = (uint8_t)MIN(handle->txDataSize, count);
#else
            tempCount = 1;
#endif

            /* Using non block API to write the data to the registers. */
            if (!handle->is16bitData)
            {
                LPUART_WriteNonBlocking(base, handle->txData, tempCount);
                handle->txData = &handle->txData[tempCount];
            }
            else
            {
                LPUART_WriteNonBlocking16bit(base, handle->txData16, tempCount);
                handle->txData16 = &handle->txData16[tempCount];
            }
            handle->txDataSize -= tempCount;
            count -= tempCount;

            /* If all the data are written to data register, notify user with the callback, then TX finished. */
            if (0U == handle->txDataSize)
            {
                /* Disable and re-enable the global interrupt to protect the interrupt enable register during
                 * read-modify-wrte. */
                irqMask = DisableGlobalIRQ();
                /* Disable TX register empty interrupt and enable transmission completion interrupt. */
                base->CTRL = (base->CTRL & ~LPUART_CTRL_TIE_MASK) | LPUART_CTRL_TCIE_MASK;
                EnableGlobalIRQ(irqMask);
            }
        }
    }

    /* Transmission complete and the interrupt is enabled. */
    if ((0U != ((uint32_t)kLPUART_TransmissionCompleteFlag & status)) &&
        (0U != ((uint32_t)kLPUART_TransmissionCompleteInterruptEnable & enabledInterrupts)))
    {
        /* Set txState to idle only when all data has been sent out to bus. */
        handle->txState = (uint8_t)kLPUART_TxIdle;

        /* Disable and re-enable the global interrupt to protect the interrupt enable register during read-modify-wrte.
         */
        irqMask = DisableGlobalIRQ();
        /* Disable transmission complete interrupt. */
        base->CTRL &= ~(uint32_t)LPUART_CTRL_TCIE_MASK;
        EnableGlobalIRQ(irqMask);

        /* Trigger callback. */
        if (NULL != handle->callback)
        {
            handle->callback(base, handle, kStatus_LPUART_TxIdle, handle->userData);
        }
    }
}

/*!
 * brief LPUART Error IRQ handle function.
 *
 * This function handles the LPUART error IRQ request.
 *
 * param base LPUART peripheral base address.
 * param irqHandle LPUART handle pointer.
 */
void LPUART_TransferHandleErrorIRQ(LPUART_Type *base, void *irqHandle)
{
    /* To be implemented by User. */
}
