flexcomm/spi/fsl_spi.c

/*
 * Copyright (c) 2016, Freescale Semiconductor, Inc.
 * Copyright 2016-2020,2022 NXP
 * All rights reserved.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

#include "fsl_spi.h"
#include "fsl_flexcomm.h"

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

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

/* Note:  FIFOCFG[SIZE] has always value 1 = 8 items depth */

#if defined(FSL_FEATURE_SPI_FIFOSIZE_CFG) && (FSL_FEATURE_SPI_FIFOSIZE_CFG)
#define SPI_FIFO_DEPTH(base) 4
#else
#define SPI_FIFO_DEPTH(base) ((((base)->FIFOCFG & SPI_FIFOCFG_SIZE_MASK) >> SPI_FIFOCFG_SIZE_SHIFT) << 3)
#endif /*FSL_FEATURE_SPI_FIFOSIZE_CFG*/

/* Convert transfer count to transfer bytes. dataWidth is a
 * range <0,15>. Range <8,15> represents 2B transfer */
#define SPI_COUNT_TO_BYTES(dataWidth, count) ((count) << ((dataWidth) >> 3U))
#define SPI_BYTES_TO_COUNT(dataWidth, bytes) ((bytes) >> ((dataWidth) >> 3U))
#if defined(FSL_FEATURE_SPI_IS_SSEL_PIN_COUNT_EQUAL_TO_THREE) && (FSL_FEATURE_SPI_IS_SSEL_PIN_COUNT_EQUAL_TO_THREE)
#define SPI_SSELPOL_MASK ((SPI_CFG_SPOL0_MASK) | (SPI_CFG_SPOL1_MASK) | (SPI_CFG_SPOL2_MASK))
#else
#if (defined(FSL_FEATURE_SPI_SSEL_COUNT) && (FSL_FEATURE_SPI_SSEL_COUNT == 2))
#define SPI_SSELPOL_MASK ((SPI_CFG_SPOL0_MASK) | (SPI_CFG_SPOL1_MASK))
#else
#define SPI_SSELPOL_MASK ((SPI_CFG_SPOL0_MASK) | (SPI_CFG_SPOL1_MASK) | (SPI_CFG_SPOL2_MASK) | (SPI_CFG_SPOL3_MASK))
#endif /* FSL_FEATURE_SPI_SSEL_COUNT == 2 */
#endif /*FSL_FEATURE_SPI_IS_SSEL_PIN_COUNT_EQUAL_TO_THREE*/

/*!
 * @brief Used for conversion from `flexcomm_irq_handler_t` to `flexcomm_spi_master_irq_handler_t` and
 * `flexcomm_spi_slave_irq_handler_t`.
 */
typedef union spi_to_flexcomm
{
    flexcomm_spi_master_irq_handler_t spi_master_handler;
    flexcomm_spi_slave_irq_handler_t spi_slave_handler;
    flexcomm_irq_handler_t flexcomm_handler;
} spi_to_flexcomm_t;

/*******************************************************************************
 * Variables
 ******************************************************************************/
/*! @brief internal SPI config array */
static spi_config_t g_configs[FSL_FEATURE_SOC_SPI_COUNT] = {(spi_data_width_t)0};

/*! @brief Array to map SPI instance number to base address. */
static const uint32_t s_spiBaseAddrs[FSL_FEATURE_SOC_SPI_COUNT] = SPI_BASE_ADDRS;

/*! @brief IRQ name array */
static const IRQn_Type s_spiIRQ[] = SPI_IRQS;

/* @brief Dummy data for each instance. This data is used when user's tx buffer is NULL*/
volatile uint8_t s_dummyData[FSL_FEATURE_SOC_SPI_COUNT] = {0};
/*******************************************************************************
 * Code
 ******************************************************************************/

/* Get the index corresponding to the FLEXCOMM */
/*! brief Returns instance number for SPI peripheral base address. */
uint32_t SPI_GetInstance(SPI_Type *base)
{
    uint32_t i;

    for (i = 0U; i < (uint32_t)FSL_FEATURE_SOC_SPI_COUNT; i++)
    {
        if ((uint32_t)base == s_spiBaseAddrs[i])
        {
            break;
        }
    }

    assert(i < (uint32_t)FSL_FEATURE_SOC_SPI_COUNT);
    return i;
}

/*!
 * brief Set up the dummy data.
 *
 * param base SPI peripheral address.
 * param dummyData Data to be transferred when tx buffer is NULL.
 */
void SPI_SetDummyData(SPI_Type *base, uint8_t dummyData)
{
    uint32_t instance     = SPI_GetInstance(base);
    s_dummyData[instance] = dummyData;
}

/*!
 * brief Returns the configurations.
 *
 * param base SPI peripheral address.
 * return return configurations which contain datawidth and SSEL numbers.
 *         return data type is a pointer of spi_config_t.
 */
void *SPI_GetConfig(SPI_Type *base)
{
    uint32_t instance;
    instance = SPI_GetInstance(base);
    return &g_configs[instance];
}

/*!
 * brief  Sets the SPI master configuration structure to default values.
 *
 * The purpose of this API is to get the configuration structure initialized for use in SPI_MasterInit().
 * User may use the initialized structure unchanged in SPI_MasterInit(), or modify
 * some fields of the structure before calling SPI_MasterInit(). After calling this API,
 * the master is ready to transfer.
 * Example:
   code
   spi_master_config_t config;
   SPI_MasterGetDefaultConfig(&config);
   endcode
 *
 * param config pointer to master config structure
 */
void SPI_MasterGetDefaultConfig(spi_master_config_t *config)
{
    assert(NULL != config);

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

    config->enableLoopback            = false;
    config->enableMaster              = true;
    config->polarity                  = kSPI_ClockPolarityActiveHigh;
    config->phase                     = kSPI_ClockPhaseFirstEdge;
    config->direction                 = kSPI_MsbFirst;
    config->baudRate_Bps              = 500000U;
    config->dataWidth                 = kSPI_Data8Bits;
    config->sselNum                   = kSPI_Ssel0;
    config->txWatermark               = (uint8_t)kSPI_TxFifo0;
    config->rxWatermark               = (uint8_t)kSPI_RxFifo1;
    config->sselPol                   = kSPI_SpolActiveAllLow;
    config->delayConfig.preDelay      = 0U;
    config->delayConfig.postDelay     = 0U;
    config->delayConfig.frameDelay    = 0U;
    config->delayConfig.transferDelay = 0U;
}

/*!
 * brief Initializes the SPI with master configuration.
 *
 * The configuration structure can be filled by user from scratch, or be set with default
 * values by SPI_MasterGetDefaultConfig(). After calling this API, the slave is ready to transfer.
 * Example
   code
   spi_master_config_t config = {
   .baudRate_Bps = 400000,
   ...
   };
   SPI_MasterInit(SPI0, &config);
   endcode
 *
 * param base SPI base pointer
 * param config pointer to master configuration structure
 * param srcClock_Hz Source clock frequency.
 */
status_t SPI_MasterInit(SPI_Type *base, const spi_master_config_t *config, uint32_t srcClock_Hz)
{
    status_t result = kStatus_Success;
    uint32_t instance;
    uint32_t tmpConfig;

    /* assert params */
    assert(!((NULL == base) || (NULL == config) || (0U == srcClock_Hz)));
    if ((NULL == base) || (NULL == config) || (0U == srcClock_Hz))
    {
        return kStatus_InvalidArgument;
    }

    /* initialize flexcomm to SPI mode */
    result = FLEXCOMM_Init(base, FLEXCOMM_PERIPH_SPI);
    if (kStatus_Success != result)
    {
        return result;
    }

    /* set divider */
    result = SPI_MasterSetBaud(base, config->baudRate_Bps, srcClock_Hz);
    if (kStatus_Success != result)
    {
        return result;
    }

    /* get instance number */
    instance = SPI_GetInstance(base);

    /* configure SPI mode */
    tmpConfig = base->CFG;
    tmpConfig &= ~(SPI_CFG_MASTER_MASK | SPI_CFG_LSBF_MASK | SPI_CFG_CPHA_MASK | SPI_CFG_CPOL_MASK | SPI_CFG_LOOP_MASK |
                   SPI_CFG_ENABLE_MASK | SPI_SSELPOL_MASK);
    /* phase */
    tmpConfig |= SPI_CFG_CPHA(config->phase);
    /* polarity */
    tmpConfig |= SPI_CFG_CPOL(config->polarity);
    /* direction */
    tmpConfig |= SPI_CFG_LSBF(config->direction);
    /* master mode */
    tmpConfig |= SPI_CFG_MASTER(1);
    /* loopback */
    tmpConfig |= SPI_CFG_LOOP(config->enableLoopback);
    /* configure active level for all CS */
    tmpConfig |= ((uint32_t)config->sselPol & (SPI_SSELPOL_MASK));
    base->CFG = tmpConfig;

    /* store configuration */
    g_configs[instance].dataWidth = config->dataWidth;
    g_configs[instance].sselNum   = config->sselNum;
    /* enable FIFOs */
    base->FIFOCFG |= SPI_FIFOCFG_EMPTYTX_MASK | SPI_FIFOCFG_EMPTYRX_MASK;
    base->FIFOCFG |= SPI_FIFOCFG_ENABLETX_MASK | SPI_FIFOCFG_ENABLERX_MASK;
    /* trigger level - empty txFIFO, one item in rxFIFO */
    tmpConfig = base->FIFOTRIG & (~(SPI_FIFOTRIG_RXLVL_MASK | SPI_FIFOTRIG_TXLVL_MASK));
    tmpConfig |= SPI_FIFOTRIG_TXLVL(config->txWatermark) | SPI_FIFOTRIG_RXLVL(config->rxWatermark);
    /* enable generating interrupts for FIFOTRIG levels */
    tmpConfig |= SPI_FIFOTRIG_TXLVLENA_MASK | SPI_FIFOTRIG_RXLVLENA_MASK;
    /* set FIFOTRIG */
    base->FIFOTRIG = tmpConfig;

    /* Set the delay configuration. */
    SPI_SetTransferDelay(base, &config->delayConfig);
    /* Set the dummy data. */
    SPI_SetDummyData(base, (uint8_t)SPI_DUMMYDATA);

    SPI_Enable(base, config->enableMaster);
    return kStatus_Success;
}

/*!
 * brief  Sets the SPI slave configuration structure to default values.
 *
 * The purpose of this API is to get the configuration structure initialized for use in SPI_SlaveInit().
 * Modify some fields of the structure before calling SPI_SlaveInit().
 * Example:
   code
   spi_slave_config_t config;
   SPI_SlaveGetDefaultConfig(&config);
   endcode
 *
 * param config pointer to slave configuration structure
 */
void SPI_SlaveGetDefaultConfig(spi_slave_config_t *config)
{
    assert(NULL != config);

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

    config->enableSlave = true;
    config->polarity    = kSPI_ClockPolarityActiveHigh;
    config->phase       = kSPI_ClockPhaseFirstEdge;
    config->direction   = kSPI_MsbFirst;
    config->dataWidth   = kSPI_Data8Bits;
    config->txWatermark = (uint8_t)kSPI_TxFifo0;
    config->rxWatermark = (uint8_t)kSPI_RxFifo1;
    config->sselPol     = kSPI_SpolActiveAllLow;
}

/*!
 * brief Initializes the SPI with slave configuration.
 *
 * The configuration structure can be filled by user from scratch or be set with
 * default values by SPI_SlaveGetDefaultConfig().
 * After calling this API, the slave is ready to transfer.
 * Example
   code
    spi_slave_config_t config = {
    .polarity = flexSPIClockPolarity_ActiveHigh;
    .phase = flexSPIClockPhase_FirstEdge;
    .direction = flexSPIMsbFirst;
    ...
    };
    SPI_SlaveInit(SPI0, &config);
   endcode
 *
 * param base SPI base pointer
 * param config pointer to slave configuration structure
 */
status_t SPI_SlaveInit(SPI_Type *base, const spi_slave_config_t *config)
{
    status_t result = kStatus_Success;
    uint32_t instance;
    uint32_t tmpConfig;

    /* assert params */
    assert(!((NULL == base) || (NULL == config)));
    if ((NULL == base) || (NULL == config))
    {
        return kStatus_InvalidArgument;
    }
    /* configure flexcomm to SPI, enable clock gate */
    result = FLEXCOMM_Init(base, FLEXCOMM_PERIPH_SPI);
    if (kStatus_Success != result)
    {
        return result;
    }

    instance = SPI_GetInstance(base);

    /* configure SPI mode */
    tmpConfig = base->CFG;
    tmpConfig &= ~(SPI_CFG_MASTER_MASK | SPI_CFG_LSBF_MASK | SPI_CFG_CPHA_MASK | SPI_CFG_CPOL_MASK |
                   SPI_CFG_ENABLE_MASK | SPI_SSELPOL_MASK);
    /* phase */
    tmpConfig |= SPI_CFG_CPHA(config->phase);
    /* polarity */
    tmpConfig |= SPI_CFG_CPOL(config->polarity);
    /* direction */
    tmpConfig |= SPI_CFG_LSBF(config->direction);
    /* configure active level for all CS */
    tmpConfig |= ((uint32_t)config->sselPol & (SPI_SSELPOL_MASK));
    base->CFG = tmpConfig;

    /* store configuration */
    g_configs[instance].dataWidth = config->dataWidth;
    /* empty and enable FIFOs */
    base->FIFOCFG |= SPI_FIFOCFG_EMPTYTX_MASK | SPI_FIFOCFG_EMPTYRX_MASK;
    base->FIFOCFG |= SPI_FIFOCFG_ENABLETX_MASK | SPI_FIFOCFG_ENABLERX_MASK;
    /* trigger level - empty txFIFO, one item in rxFIFO */
    tmpConfig = base->FIFOTRIG & (~(SPI_FIFOTRIG_RXLVL_MASK | SPI_FIFOTRIG_TXLVL_MASK));
    tmpConfig |= SPI_FIFOTRIG_TXLVL(config->txWatermark) | SPI_FIFOTRIG_RXLVL(config->rxWatermark);
    /* enable generating interrupts for FIFOTRIG levels */
    tmpConfig |= SPI_FIFOTRIG_TXLVLENA_MASK | SPI_FIFOTRIG_RXLVLENA_MASK;
    /* set FIFOTRIG */
    base->FIFOTRIG = tmpConfig;

    SPI_SetDummyData(base, (uint8_t)SPI_DUMMYDATA);

    SPI_Enable(base, config->enableSlave);
    return kStatus_Success;
}

/*!
 * brief De-initializes the SPI.
 *
 * Calling this API resets the SPI module, gates the SPI clock.
 * The SPI module can't work unless calling the SPI_MasterInit/SPI_SlaveInit to initialize module.
 *
 * param base SPI base pointer
 */
void SPI_Deinit(SPI_Type *base)
{
    /* Assert arguments */
    assert(NULL != base);
    /* Disable interrupts, disable dma requests, disable peripheral */
    base->FIFOINTENCLR = SPI_FIFOINTENCLR_TXERR_MASK | SPI_FIFOINTENCLR_RXERR_MASK | SPI_FIFOINTENCLR_TXLVL_MASK |
                         SPI_FIFOINTENCLR_RXLVL_MASK;
    base->FIFOCFG &= ~(SPI_FIFOCFG_DMATX_MASK | SPI_FIFOCFG_DMARX_MASK);
    base->CFG &= ~(SPI_CFG_ENABLE_MASK);
}

/*!
 * brief Enables the DMA request from SPI txFIFO.
 *
 * param base SPI base pointer
 * param enable True means enable DMA, false means disable DMA
 */
void SPI_EnableTxDMA(SPI_Type *base, bool enable)
{
    if (enable)
    {
        base->FIFOCFG |= SPI_FIFOCFG_DMATX_MASK;
    }
    else
    {
        base->FIFOCFG &= ~SPI_FIFOCFG_DMATX_MASK;
    }
}

/*!
 * brief Enables the DMA request from SPI rxFIFO.
 *
 * param base SPI base pointer
 * param enable True means enable DMA, false means disable DMA
 */
void SPI_EnableRxDMA(SPI_Type *base, bool enable)
{
    if (enable)
    {
        base->FIFOCFG |= SPI_FIFOCFG_DMARX_MASK;
    }
    else
    {
        base->FIFOCFG &= ~SPI_FIFOCFG_DMARX_MASK;
    }
}

/*!
 * brief Sets the baud rate for SPI transfer. This is only used in master.
 *
 * param base SPI base pointer
 * param baudrate_Bps baud rate needed in Hz.
 * param srcClock_Hz SPI source clock frequency in Hz.
 */
status_t SPI_MasterSetBaud(SPI_Type *base, uint32_t baudrate_Bps, uint32_t srcClock_Hz)
{
    uint32_t tmpDiv;

    /* assert params */
    assert(!((NULL == base) || (0U == baudrate_Bps) || (0U == srcClock_Hz)));
    if ((NULL == base) || (0U == baudrate_Bps) || (0U == srcClock_Hz))
    {
        return kStatus_InvalidArgument;
    }

    /* calculate baudrate, round up the result */
    tmpDiv = ((srcClock_Hz * 10U) / baudrate_Bps + 5U) / 10U - 1U;
    if (tmpDiv > 0xFFFFU)
    {
        return kStatus_SPI_BaudrateNotSupport;
    }
    base->DIV &= ~SPI_DIV_DIVVAL_MASK;
    base->DIV |= SPI_DIV_DIVVAL(tmpDiv);
    return kStatus_Success;
}

/*!
 * brief Writes a data into the SPI data register.
 *
 * param base SPI base pointer
 * param data needs to be write.
 * param configFlags transfer configuration options ref spi_xfer_option_t
 */
void SPI_WriteData(SPI_Type *base, uint16_t data, uint32_t configFlags)
{
    uint32_t control = 0U;
    uint32_t instance;

    /* check params */
    assert(NULL != base);
    /* get and check instance */
    instance = SPI_GetInstance(base);

    /* set data width */
    control |= (uint32_t)SPI_FIFOWR_LEN((g_configs[instance].dataWidth));
    /* set sssel */
    control |= (SPI_DEASSERT_ALL & (~SPI_DEASSERTNUM_SSEL((uint32_t)(g_configs[instance].sselNum))));
    /* mask configFlags */
    control |= (configFlags & (uint32_t)SPI_FIFOWR_FLAGS_MASK);
    /* control should not affect lower 16 bits */
    assert(0U == (control & 0xFFFFU));
    base->FIFOWR = data | control;
}

/*!
 * brief Initializes the SPI master handle.
 *
 * This function initializes the SPI master handle which can be used for other SPI master transactional APIs. Usually,
 * for a specified SPI instance, call this API once to get the initialized handle.
 *
 * param base SPI peripheral base address.
 * param handle SPI handle pointer.
 * param callback Callback function.
 * param userData User data.
 */
status_t SPI_MasterTransferCreateHandle(SPI_Type *base,
                                        spi_master_handle_t *handle,
                                        spi_master_callback_t callback,
                                        void *userData)
{
    /* check 'base' */
    assert(NULL != base);
    /* check 'handle' */
    assert(NULL != handle);

    uint32_t instance;
    spi_to_flexcomm_t handler;

    /* get flexcomm instance by 'base' param */
    instance = SPI_GetInstance(base);

    (void)memset(handle, 0, sizeof(*handle));
    /* Initialize the handle */
    if ((base->CFG & SPI_CFG_MASTER_MASK) != 0U)
    {
        handler.spi_master_handler = SPI_MasterTransferHandleIRQ;
        FLEXCOMM_SetIRQHandler(base, handler.flexcomm_handler, handle);
    }
    else
    {
        handler.spi_slave_handler = SPI_SlaveTransferHandleIRQ;
        FLEXCOMM_SetIRQHandler(base, handler.flexcomm_handler, handle);
    }

    handle->dataWidth = (uint8_t)(g_configs[instance].dataWidth);
    /* in slave mode, the sselNum is not important */
    handle->sselNum     = (uint8_t)(g_configs[instance].sselNum);
    handle->txWatermark = (uint8_t)SPI_FIFOTRIG_TXLVL_GET(base);
    handle->rxWatermark = (uint8_t)SPI_FIFOTRIG_RXLVL_GET(base);
    handle->callback    = callback;
    handle->userData    = userData;

    /* Enable SPI NVIC */
    (void)EnableIRQ(s_spiIRQ[instance]);

    return kStatus_Success;
}

/*!
 * brief Transfers a block of data using a polling method.
 *
 * param base SPI base pointer
 * param xfer pointer to spi_xfer_config_t structure
 * retval kStatus_Success Successfully start a transfer.
 * retval kStatus_InvalidArgument Input argument is invalid.
 * retval kStatus_SPI_Timeout The transfer timed out and was aborted.
 */
status_t SPI_MasterTransferBlocking(SPI_Type *base, spi_transfer_t *xfer)
{
    uint32_t instance;
    uint32_t tx_ctrl = 0U, last_ctrl = 0U;
    uint32_t tmp32, rxRemainingBytes, txRemainingBytes, dataWidth;
    uint32_t toReceiveCount = 0;
    const uint8_t *txData;
    uint8_t *rxData;
    uint32_t fifoDepth;
#if SPI_RETRY_TIMES
    uint32_t waitTimes = SPI_RETRY_TIMES;
#endif

    /* check params */
    assert(!((NULL == base) || (NULL == xfer) || ((NULL == xfer->txData) && (NULL == xfer->rxData))));
    if ((NULL == base) || (NULL == xfer) || ((NULL == xfer->txData) && (NULL == xfer->rxData)))
    {
        return kStatus_InvalidArgument;
    }

    fifoDepth        = SPI_FIFO_DEPTH(base);
    txData           = xfer->txData;
    rxData           = xfer->rxData;
    txRemainingBytes = (txData != NULL) ? xfer->dataSize : 0U;
    rxRemainingBytes = (rxData != NULL) ? xfer->dataSize : 0U;

    instance  = SPI_GetInstance(base);
    dataWidth = (uint32_t)(g_configs[instance].dataWidth);

    /* dataSize (in bytes) is not aligned to 16bit (2B) transfer */
    if ((dataWidth > (uint32_t)kSPI_Data8Bits) && ((xfer->dataSize & 0x1U) != 0U))
    {
        return kStatus_InvalidArgument;
    }

    /* clear tx/rx errors and empty FIFOs */
    base->FIFOCFG |= SPI_FIFOCFG_EMPTYTX_MASK | SPI_FIFOCFG_EMPTYRX_MASK;
    base->FIFOSTAT |= SPI_FIFOSTAT_TXERR_MASK | SPI_FIFOSTAT_RXERR_MASK;
    /* select slave to talk with */
    tx_ctrl |= (SPI_DEASSERT_ALL & (~SPI_DEASSERTNUM_SSEL((uint32_t)(g_configs[instance].sselNum))));
    /* set width of data - range asserted at entry */
    tx_ctrl |= SPI_FIFOWR_LEN(dataWidth);
    /* delay for frames */
    tx_ctrl |= ((xfer->configFlags & (uint32_t)kSPI_FrameDelay) != 0U) ? (uint32_t)kSPI_FrameDelay : 0U;
    /* end of transfer */
    last_ctrl |= ((xfer->configFlags & (uint32_t)kSPI_FrameAssert) != 0U) ? (uint32_t)kSPI_FrameAssert : 0U;
    /* last index of loop */
    while ((txRemainingBytes != 0U) || (rxRemainingBytes != 0U) || (toReceiveCount != 0U))
    {
#if SPI_RETRY_TIMES
        if (--waitTimes == 0U)
        {
            return kStatus_SPI_Timeout;
        }
#endif
        /* if rxFIFO is not empty */
        if ((base->FIFOSTAT & SPI_FIFOSTAT_RXNOTEMPTY_MASK) != 0U)
        {
            tmp32 = base->FIFORD;
            /* rxBuffer is not empty */
            if (rxRemainingBytes != 0U)
            {
                *(rxData++) = (uint8_t)tmp32;
                rxRemainingBytes--;
                /* read 16 bits at once */
                if (dataWidth > 8U)
                {
                    *(rxData++) = (uint8_t)(tmp32 >> 8);
                    rxRemainingBytes--;
                }
            }
            /* decrease number of data expected to receive */
            toReceiveCount -= 1U;
        }
        /* transmit if txFIFO is not full and data to receive does not exceed FIFO depth */
        if (((base->FIFOSTAT & SPI_FIFOSTAT_TXNOTFULL_MASK) != 0U) && (toReceiveCount < fifoDepth) &&
            ((txRemainingBytes != 0U) || (rxRemainingBytes >= SPI_COUNT_TO_BYTES(dataWidth, toReceiveCount + 1U))))
        {
            /* txBuffer is not empty */
            if (txRemainingBytes != 0U)
            {
                tmp32 = *(txData++);
                txRemainingBytes--;
                /* write 16 bit at once */
                if (dataWidth > 8U)
                {
                    tmp32 |= ((uint32_t)(*(txData++))) << 8U;
                    txRemainingBytes--;
                }
                if (txRemainingBytes == 0U)
                {
                    tx_ctrl |= last_ctrl;
                }
            }
            else
            {
                tmp32 = (uint32_t)s_dummyData[instance];
                tmp32 |= (uint32_t)s_dummyData[instance] << 8U;
                /* last transfer */
                if (rxRemainingBytes == SPI_COUNT_TO_BYTES(dataWidth, toReceiveCount + 1U))
                {
                    tx_ctrl |= last_ctrl;
                }
            }
            /* send data */
            tmp32        = tx_ctrl | tmp32;
            base->FIFOWR = tmp32;
            toReceiveCount += 1U;
        }
    }
    /* wait if TX FIFO of previous transfer is not empty */
#if SPI_RETRY_TIMES
    waitTimes = SPI_RETRY_TIMES;
    while ((0U == (base->FIFOSTAT & SPI_FIFOSTAT_TXEMPTY_MASK)) && (0U != --waitTimes))
#else
    while (0U == (base->FIFOSTAT & SPI_FIFOSTAT_TXEMPTY_MASK))
#endif
    {
    }
#if SPI_RETRY_TIMES
    if (waitTimes == 0U)
    {
        return kStatus_SPI_Timeout;
    }
#endif
    return kStatus_Success;
}

/*!
 * brief Performs a non-blocking SPI interrupt transfer.
 *
 * param base SPI peripheral base address.
 * param handle pointer to spi_master_handle_t structure which stores the transfer state
 * param xfer pointer to spi_xfer_config_t structure
 * retval kStatus_Success Successfully start a transfer.
 * retval kStatus_InvalidArgument Input argument is invalid.
 * retval kStatus_SPI_Busy SPI is not idle, is running another transfer.
 */
status_t SPI_MasterTransferNonBlocking(SPI_Type *base, spi_master_handle_t *handle, spi_transfer_t *xfer)
{
    /* check params */
    assert(
        !((NULL == base) || (NULL == handle) || (NULL == xfer) || ((NULL == xfer->txData) && (NULL == xfer->rxData))));
    if ((NULL == base) || (NULL == handle) || (NULL == xfer) || ((NULL == xfer->txData) && (NULL == xfer->rxData)))
    {
        return kStatus_InvalidArgument;
    }

    /* dataSize (in bytes) is not aligned to 16bit (2B) transfer */
    assert(!((handle->dataWidth > (uint8_t)kSPI_Data8Bits) && ((xfer->dataSize & 0x1U) != 0U)));
    if ((handle->dataWidth > (uint8_t)kSPI_Data8Bits) && ((xfer->dataSize & 0x1U) != 0U))
    {
        return kStatus_InvalidArgument;
    }

    /* Check if SPI is busy */
    if (handle->state == (uint32_t)kStatus_SPI_Busy)
    {
        return kStatus_SPI_Busy;
    }

    /* Set the handle information */
    handle->txData = xfer->txData;
    handle->rxData = xfer->rxData;
    /* set count */
    handle->txRemainingBytes = (xfer->txData != NULL) ? xfer->dataSize : 0U;
    handle->rxRemainingBytes = (xfer->rxData != NULL) ? xfer->dataSize : 0U;
    handle->totalByteCount   = xfer->dataSize;
    /* other options */
    handle->toReceiveCount = 0;
    handle->configFlags    = xfer->configFlags;
    /* Set the SPI state to busy */
    handle->state = (uint32_t)kStatus_SPI_Busy;
    /* clear FIFOs when transfer starts */
    base->FIFOCFG |= SPI_FIFOCFG_EMPTYTX_MASK | SPI_FIFOCFG_EMPTYRX_MASK;
    base->FIFOSTAT |= SPI_FIFOSTAT_TXERR_MASK | SPI_FIFOSTAT_RXERR_MASK;
    /* enable generating txIRQ and rxIRQ, first transfer is fired by empty txFIFO */
    base->FIFOINTENSET |= SPI_FIFOINTENSET_TXLVL_MASK | SPI_FIFOINTENSET_RXLVL_MASK;
    return kStatus_Success;
}

/*!
 * brief Transfers a block of data using a polling method.
 *
 * This function will do a half-duplex transfer for SPI master, This is a blocking function,
 * which does not retuen until all transfer have been completed. And data transfer mechanism is half-duplex,
 * users can set transmit first or receive first.
 *
 * param base SPI base pointer
 * param xfer pointer to spi_half_duplex_transfer_t structure
 * return status of status_t.
 */
status_t SPI_MasterHalfDuplexTransferBlocking(SPI_Type *base, spi_half_duplex_transfer_t *xfer)
{
    assert(xfer != NULL);

    spi_transfer_t tempXfer = {0};
    status_t status;

    if (xfer->isTransmitFirst)
    {
        tempXfer.txData   = xfer->txData;
        tempXfer.rxData   = NULL;
        tempXfer.dataSize = xfer->txDataSize;
    }
    else
    {
        tempXfer.txData   = NULL;
        tempXfer.rxData   = xfer->rxData;
        tempXfer.dataSize = xfer->rxDataSize;
    }
    /* If the pcs pin keep assert between transmit and receive. */
    if (xfer->isPcsAssertInTransfer)
    {
        tempXfer.configFlags = (xfer->configFlags) & (~(uint32_t)kSPI_FrameAssert);
    }
    else
    {
        tempXfer.configFlags = (xfer->configFlags) | (uint32_t)kSPI_FrameAssert;
    }

    status = SPI_MasterTransferBlocking(base, &tempXfer);

    if (status != kStatus_Success)
    {
        return status;
    }

    if (xfer->isTransmitFirst)
    {
        tempXfer.txData   = NULL;
        tempXfer.rxData   = xfer->rxData;
        tempXfer.dataSize = xfer->rxDataSize;
    }
    else
    {
        tempXfer.txData   = xfer->txData;
        tempXfer.rxData   = NULL;
        tempXfer.dataSize = xfer->txDataSize;
    }
    tempXfer.configFlags = xfer->configFlags;

    /* SPI transfer blocking. */
    status = SPI_MasterTransferBlocking(base, &tempXfer);

    return status;
}

/*!
 * brief Performs a non-blocking SPI interrupt transfer.
 *
 * This function using polling way to do the first half transimission and using interrupts to
 * do the second half transimission, the transfer mechanism is half-duplex.
 * When do the second half transimission, code will return right away. When all data is transferred,
 * the callback function is called.
 *
 * param base SPI peripheral base address.
 * param handle pointer to spi_master_handle_t structure which stores the transfer state
 * param xfer pointer to spi_half_duplex_transfer_t structure
 * return status of status_t.
 */
status_t SPI_MasterHalfDuplexTransferNonBlocking(SPI_Type *base,
                                                 spi_master_handle_t *handle,
                                                 spi_half_duplex_transfer_t *xfer)
{
    assert(xfer != NULL);
    assert(handle != NULL);
    spi_transfer_t tempXfer = {0};
    status_t status;

    if (xfer->isTransmitFirst)
    {
        tempXfer.txData   = xfer->txData;
        tempXfer.rxData   = NULL;
        tempXfer.dataSize = xfer->txDataSize;
    }
    else
    {
        tempXfer.txData   = NULL;
        tempXfer.rxData   = xfer->rxData;
        tempXfer.dataSize = xfer->rxDataSize;
    }
    /* If the PCS pin keep assert between transmit and receive. */
    if (xfer->isPcsAssertInTransfer)
    {
        tempXfer.configFlags = (xfer->configFlags) & (~(uint32_t)kSPI_FrameAssert);
    }
    else
    {
        tempXfer.configFlags = (xfer->configFlags) | (uint32_t)kSPI_FrameAssert;
    }

    status = SPI_MasterTransferBlocking(base, &tempXfer);
    if (status != kStatus_Success)
    {
        return status;
    }

    if (xfer->isTransmitFirst)
    {
        tempXfer.txData   = NULL;
        tempXfer.rxData   = xfer->rxData;
        tempXfer.dataSize = xfer->rxDataSize;
    }
    else
    {
        tempXfer.txData   = xfer->txData;
        tempXfer.rxData   = NULL;
        tempXfer.dataSize = xfer->txDataSize;
    }
    tempXfer.configFlags = xfer->configFlags;

    status = SPI_MasterTransferNonBlocking(base, handle, &tempXfer);

    return status;
}

/*!
 * brief Gets the master transfer count.
 *
 * This function gets the master transfer count.
 *
 * param base SPI peripheral base address.
 * param handle Pointer to the spi_master_handle_t structure which stores the transfer state.
 * param count The number of bytes transferred by using the non-blocking transaction.
 * return status of status_t.
 */
status_t SPI_MasterTransferGetCount(SPI_Type *base, spi_master_handle_t *handle, size_t *count)
{
    assert(NULL != handle);

    if (NULL == count)
    {
        return kStatus_InvalidArgument;
    }

    /* Catch when there is not an active transfer. */
    if (handle->state != (uint32_t)kStatus_SPI_Busy)
    {
        *count = 0;
        return kStatus_NoTransferInProgress;
    }

    *count = handle->totalByteCount - handle->rxRemainingBytes;
    return kStatus_Success;
}

/*!
 * brief SPI master aborts a transfer using an interrupt.
 *
 * This function aborts a transfer using an interrupt.
 *
 * param base SPI peripheral base address.
 * param handle Pointer to the spi_master_handle_t structure which stores the transfer state.
 */
void SPI_MasterTransferAbort(SPI_Type *base, spi_master_handle_t *handle)
{
    assert(NULL != handle);

    /* Disable interrupt requests*/
    base->FIFOINTENSET &= ~(SPI_FIFOINTENSET_TXLVL_MASK | SPI_FIFOINTENSET_RXLVL_MASK);
    /* Empty FIFOs */
    base->FIFOCFG |= SPI_FIFOCFG_EMPTYTX_MASK | SPI_FIFOCFG_EMPTYRX_MASK;

    handle->state            = (uint32_t)kStatus_SPI_Idle;
    handle->txRemainingBytes = 0U;
    handle->rxRemainingBytes = 0U;
}

static void SPI_TransferHandleIRQInternal(SPI_Type *base, spi_master_handle_t *handle)
{
    uint32_t tx_ctrl = 0U, last_ctrl = 0U, tmp32;
    bool loopContinue;
    uint32_t fifoDepth;
    /* Get flexcomm instance by 'base' param */
    uint32_t instance = SPI_GetInstance(base);
    size_t txRemainingBytes;
    size_t rxRemainingBytes;
    uint8_t toReceiveCount;

    /* check params */
    assert((NULL != base) && (NULL != handle) && ((NULL != handle->txData) || (NULL != handle->rxData)));

    fifoDepth = SPI_FIFO_DEPTH(base);
    /* select slave to talk with */
    tx_ctrl |= ((uint32_t)SPI_DEASSERT_ALL & (uint32_t)SPI_ASSERTNUM_SSEL(handle->sselNum));
    /* set width of data */
    tx_ctrl |= SPI_FIFOWR_LEN(handle->dataWidth);
    /* delay for frames */
    tx_ctrl |= ((handle->configFlags & (uint32_t)kSPI_FrameDelay) != 0U) ? (uint32_t)kSPI_FrameDelay : 0U;
    /* end of transfer */
    last_ctrl |= ((handle->configFlags & (uint32_t)kSPI_FrameAssert) != 0U) ? (uint32_t)kSPI_FrameAssert : 0U;
    do
    {
        loopContinue = false;

        /* rxFIFO is not empty */
        if ((base->FIFOSTAT & SPI_FIFOSTAT_RXNOTEMPTY_MASK) != 0U)
        {
            tmp32 = base->FIFORD;
            /* rxBuffer is not empty */
            if (handle->rxRemainingBytes != 0U)
            {
                /* low byte must go first */
                *(handle->rxData++) = (uint8_t)tmp32;
                handle->rxRemainingBytes--;
                /* read 16 bits at once */
                if (handle->dataWidth > (uint8_t)kSPI_Data8Bits)
                {
                    *(handle->rxData++) = (uint8_t)(tmp32 >> 8);
                    handle->rxRemainingBytes--;
                }
            }

            /* decrease number of data expected to receive */
            handle->toReceiveCount -= 1;
            loopContinue = true;
        }

        /* - txFIFO is not full
         * - we cannot cause rxFIFO overflow by sending more data than is the depth of FIFO
         * - txBuffer is not empty or the next 'toReceiveCount' data can fit into rxBuffer
         */
        txRemainingBytes = handle->txRemainingBytes;
        rxRemainingBytes = handle->rxRemainingBytes;
        toReceiveCount   = (handle->toReceiveCount > 0) ? (uint8_t)handle->toReceiveCount : 0U;
        if (((base->FIFOSTAT & SPI_FIFOSTAT_TXNOTFULL_MASK) != 0U) && ((uint32_t)toReceiveCount < fifoDepth) &&
            ((txRemainingBytes != 0U) ||
             (rxRemainingBytes >= SPI_COUNT_TO_BYTES(handle->dataWidth, (uint32_t)toReceiveCount + 1U))))
        {
            /* txBuffer is not empty */
            if ((txRemainingBytes != 0U) && (handle->txData != NULL))
            {
                /* low byte must go first */
                tmp32 = *(handle->txData++);
                handle->txRemainingBytes--;
                txRemainingBytes = handle->txRemainingBytes;
                /* write 16 bit at once */
                if (handle->dataWidth > (uint8_t)kSPI_Data8Bits)
                {
                    tmp32 |= ((uint32_t)(*(handle->txData++))) << 8U;
                    handle->txRemainingBytes--;
                    txRemainingBytes = handle->txRemainingBytes;
                }
                /* last transfer */
                if (handle->txRemainingBytes == 0U)
                {
                    tx_ctrl |= last_ctrl;
                }
            }
            else
            {
                tmp32 = (uint32_t)s_dummyData[instance];
                tmp32 |= (uint32_t)s_dummyData[instance] << 8U;
                /* last transfer */
                if (rxRemainingBytes == SPI_COUNT_TO_BYTES(handle->dataWidth, (uint32_t)toReceiveCount + 1U))
                {
                    tx_ctrl |= last_ctrl;
                }
            }
            /* send data */
            tmp32        = tx_ctrl | tmp32;
            base->FIFOWR = tmp32;
            /* increase number of expected data to receive */
            handle->toReceiveCount += 1;
            toReceiveCount = (handle->toReceiveCount > 0) ? (uint8_t)handle->toReceiveCount : 0U;
            loopContinue   = true;
        }
    } while (loopContinue);
}

/*!
 * brief Interrupts the handler for the SPI.
 *
 * param base SPI peripheral base address.
 * param handle pointer to spi_master_handle_t structure which stores the transfer state.
 */
void SPI_MasterTransferHandleIRQ(SPI_Type *base, spi_master_handle_t *handle)
{
    assert((NULL != base) && (NULL != handle));
    size_t txRemainingBytes;
    uint8_t toReceiveCount;

    /* IRQ behaviour:
     * - first interrupt is triggered by empty txFIFO. The transfer function
     *   then tries empty rxFIFO and fill txFIFO interleaved that results to
     *   strategy to process as many items as possible.
     * - the next IRQs can be:
     *      rxIRQ from nonempty rxFIFO which requires to empty rxFIFO.
     *      txIRQ from empty txFIFO which requires to refill txFIFO.
     * - last interrupt is triggered by empty txFIFO. The last state is
     *   known by empty rxBuffer and txBuffer. If there is nothing to receive
     *   or send - both operations have been finished and interrupts can be
     *   disabled.
     */

    /* Data to send or read or expected to receive */
    if ((handle->txRemainingBytes != 0U) || (handle->rxRemainingBytes != 0U) || (handle->toReceiveCount != 0))
    {
        /* Transmit or receive data */
        SPI_TransferHandleIRQInternal(base, handle);
        /* No data to send or read or receive. Transfer ends. Set txTrigger to 0 level and
         * enable txIRQ to confirm when txFIFO becomes empty */
        if ((0U == handle->txRemainingBytes) && (0U == handle->rxRemainingBytes) && (0 == handle->toReceiveCount))
        {
            base->FIFOTRIG = base->FIFOTRIG & (~SPI_FIFOTRIG_TXLVL_MASK);
            base->FIFOINTENSET |= SPI_FIFOINTENSET_TXLVL_MASK;
        }
        else
        {
            uint32_t rxRemainingCount = SPI_BYTES_TO_COUNT(handle->dataWidth, handle->rxRemainingBytes);
            /* If, there are no data to send or rxFIFO is already filled with necessary number of dummy data,
             * disable txIRQ. From this point only rxIRQ is used to receive data without any transmission */
            toReceiveCount = (handle->toReceiveCount > 0) ? (uint8_t)handle->toReceiveCount : 0U;
            if ((0U == handle->txRemainingBytes) && (rxRemainingCount <= toReceiveCount))
            {
                base->FIFOINTENCLR = SPI_FIFOINTENCLR_TXLVL_MASK;
            }
            /* Nothing to receive or transmit, but we still have pending data which are bellow rxLevel.
             * Cannot clear rxFIFO, txFIFO might be still active */
            if (rxRemainingCount == 0U)
            {
                txRemainingBytes = handle->txRemainingBytes;
                if ((txRemainingBytes == 0U) && (toReceiveCount != 0U) &&
                    (toReceiveCount < SPI_FIFOTRIG_RXLVL_GET(base) + 1U))
                {
                    base->FIFOTRIG = (base->FIFOTRIG & (~SPI_FIFOTRIG_RXLVL_MASK)) |
                                     SPI_FIFOTRIG_RXLVL((uint32_t)toReceiveCount - 1U);
                }
            }
            else
            {
                /* Expected to receive less data than rxLevel value, we have to update rxLevel */
                if (rxRemainingCount < (SPI_FIFOTRIG_RXLVL_GET(base) + 1U))
                {
                    base->FIFOTRIG =
                        (base->FIFOTRIG & (~SPI_FIFOTRIG_RXLVL_MASK)) | SPI_FIFOTRIG_RXLVL(rxRemainingCount - 1U);
                }
            }
        }
    }
    else
    {
        /* Empty txFIFO is confirmed. Disable IRQs and restore triggers values */
        base->FIFOINTENCLR = SPI_FIFOINTENCLR_RXLVL_MASK | SPI_FIFOINTENCLR_TXLVL_MASK;
        base->FIFOTRIG     = (base->FIFOTRIG & (~(SPI_FIFOTRIG_RXLVL_MASK | SPI_FIFOTRIG_RXLVL_MASK))) |
                         SPI_FIFOTRIG_RXLVL(handle->rxWatermark) | SPI_FIFOTRIG_TXLVL(handle->txWatermark);
        /* set idle state and call user callback */
        handle->state = (uint32_t)kStatus_SPI_Idle;
        if (handle->callback != NULL)
        {
            (handle->callback)(base, handle, handle->state, handle->userData);
        }
    }
}