mcspi_lld.h

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/*
 *  Copyright (C) 2023-24 Texas Instruments Incorporated
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions
 *  are met:
 *
 *    Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 *    Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the
 *    distribution.
 *
 *    Neither the name of Texas Instruments Incorporated nor the names of
 *    its contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 *  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
#ifndef MCSPI_LLD_H_
#define MCSPI_LLD_H_
 
/* ========================================================================== */
/*                             Include Files                                  */
/* ========================================================================== */
#include <stdint.h>
#include <stdbool.h>
#include <drivers/hw_include/csl_types.h>
#include <drivers/hw_include/cslr_mcspi.h>
#include <drivers/hw_include/cslr.h>
 
#ifdef __cplusplus
extern "C" {
#endif
 
/* ========================================================================== */
/*                           Macros & Typedefs                                */
/* ========================================================================== */
 
/*  pointer for DMA Handle  */
typedef void *MCSPI_DmaHandle;
/*  pointer for DMA Channel Config */
typedef void *MCSPI_DmaChConfig;
 
/* function pointer to get clock ticks */
typedef uint32_t (*MCSPI_clockGet) (void);
 
 
#define MCSPI_STATUS_SUCCESS         ((int32_t)0)
 
#define MCSPI_STATUS_FAILURE         ((int32_t)-1)
 
#define MCSPI_TIMEOUT                ((int32_t)-2)
 
#define MCSPI_INVALID_PARAM          ((int32_t)-3)
 
#define MCSPI_STATUS_BUSY            ((int32_t)-4)
 
#define MCSPI_INVALID_STATE          ((int32_t)-5)
 
#define MCSPI_NO_WAIT                ((uint32_t)0)
 
#define MCSPI_WAIT_FOREVER           ((uint32_t)-1)
 
#define MCSPI_STATE_RESET            ((uint32_t)0U)
 
#define MCSPI_STATE_READY            ((uint32_t)1U)
 
#define MCSPI_STATE_BUSY             ((uint32_t)2U)
 
#define MCSPI_STATE_ERROR            ((uint32_t)3U)
 
#define MCSPI_CHANNEL_0                 (0U)
#define MCSPI_CHANNEL_1                 (1U)
#define MCSPI_CHANNEL_2                 (2U)
#define MCSPI_CHANNEL_3                 (3U)
 
#define MCSPI_OPER_MODE_POLLED                 (0U)
#define MCSPI_OPER_MODE_INTERRUPT              (1U)
#define MCSPI_OPER_MODE_DMA                    (2U)
 
#define MCSPI_MAX_NUM_CHANNELS          (4U)
 
#define MCSPI_TRANSFER_COMPLETED        ((int32_t)0U)
#define MCSPI_TRANSFER_STARTED          ((int32_t)1U)
#define MCSPI_TRANSFER_CANCELLED        ((int32_t)2U)
#define MCSPI_TRANSFER_FAILED           ((int32_t)3U)
#define MCSPI_TRANSFER_CSN_DEASSERT     ((int32_t)4U)
#define MCSPI_TRANSFER_TIMEOUT          ((int32_t)5U)
 
#define MCSPI_MS_MODE_CONTROLLER        (CSL_MCSPI_MODULCTRL_MS_MASTER)
 
#define MCSPI_MS_MODE_PERIPHERAL        (CSL_MCSPI_MODULCTRL_MS_SLAVE)
 
#define MCSPI_FF_POL0_PHA0              (0U)
#define MCSPI_FF_POL0_PHA1              (1U)
#define MCSPI_FF_POL1_PHA0              (2U)
#define MCSPI_FF_POL1_PHA1              (3U)
 
#define MCSPI_CS_POL_HIGH               (CSL_MCSPI_CH0CONF_EPOL_ACTIVEHIGH)
 
#define MCSPI_CS_POL_LOW                (CSL_MCSPI_CH0CONF_EPOL_ACTIVELOW)
 
#define MCSPI_TR_MODE_TX_RX             (CSL_MCSPI_CH0CONF_TRM_TRANSRECEI)
#define MCSPI_TR_MODE_RX_ONLY           (CSL_MCSPI_CH0CONF_TRM_RECEIVONLY)
#define MCSPI_TR_MODE_TX_ONLY           (CSL_MCSPI_CH0CONF_TRM_TRANSONLY)
 
#define MCSPI_IS_D0                     (CSL_MCSPI_CH0CONF_IS_LINE0)
 
#define MCSPI_IS_D1                     (CSL_MCSPI_CH0CONF_IS_LINE1)
 
#define MCSPI_DPE_ENABLE                (CSL_MCSPI_CH0CONF_DPE0_ENABLED)
 
#define MCSPI_DPE_DISABLE               (CSL_MCSPI_CH0CONF_DPE0_DISABLED)
 
#define MCSPI_SLV_CS_SELECT_0           (CSL_MCSPI_CH0CONF_SPIENSLV_SPIEN0)
#define MCSPI_SLV_CS_SELECT_1           (CSL_MCSPI_CH0CONF_SPIENSLV_SPIEN1)
#define MCSPI_SLV_CS_SELECT_2           (CSL_MCSPI_CH0CONF_SPIENSLV_SPIEN2)
#define MCSPI_SLV_CS_SELECT_3           (CSL_MCSPI_CH0CONF_SPIENSLV_SPIEN3)
 
#define MCSPI_SB_POL_HIGH               (CSL_MCSPI_CH0CONF_SBPOL_HIGHLEVEL)
 
#define MCSPI_SB_POL_LOW                (CSL_MCSPI_CH0CONF_SBPOL_LOWLEVEL)
 
#define MCSPI_TCS0_0_CLK                (CSL_MCSPI_CH0CONF_TCS0_ZEROCYCLEDLY)
 
#define MCSPI_TCS0_1_CLK                (CSL_MCSPI_CH0CONF_TCS0_ONECYCLEDLY)
 
#define MCSPI_TCS0_2_CLK                (CSL_MCSPI_CH0CONF_TCS0_TWOCYCLEDLY)
 
#define MCSPI_TCS0_3_CLK                (CSL_MCSPI_CH0CONF_TCS0_THREECYCLEDLY)
 
#define MCSPI_CH_MODE_SINGLE            (CSL_MCSPI_MODULCTRL_SINGLE_SINGLE)
 
#define MCSPI_CH_MODE_MULTI             (CSL_MCSPI_MODULCTRL_SINGLE_MULTI)
 
#define MCSPI_PINMODE_3PIN              (CSL_MCSPI_MODULCTRL_PIN34_3PINMODE)
#define MCSPI_PINMODE_4PIN              (CSL_MCSPI_MODULCTRL_PIN34_4PINMODE)
 
#define MCSPI_INITDLY_0                 (CSL_MCSPI_MODULCTRL_INITDLY_NODELAY)
 
#define MCSPI_INITDLY_4                 (CSL_MCSPI_MODULCTRL_INITDLY_4CLKDLY)
 
#define MCSPI_INITDLY_8                 (CSL_MCSPI_MODULCTRL_INITDLY_8CLKDLY)
 
#define MCSPI_INITDLY_16                (CSL_MCSPI_MODULCTRL_INITDLY_16CLKDLY)
 
#define MCSPI_INITDLY_32                (CSL_MCSPI_MODULCTRL_INITDLY_32CLKDLY)
 
#define MCSPI_ERROR_TX_UNDERFLOW    (0x00000001U)
#define MCSPI_ERROR_RX_OVERFLOW     (0x00000002U)
 
#define MCSPI_MAX_CLK_DIVIDER_SUPPORTED   (4096U)
 
/* ========================================================================== */
/*                       Advanced Macros & Typedefs                           */
/* ========================================================================== */
 
#define MCSPI_FIFO_LENGTH           (64U)
 
#define MCSPI_RX_FIFO_ENABLE         ((uint32_t) CSL_MCSPI_CH0CONF_FFER_FFENABLED \
                                      <<                                      \
                                      CSL_MCSPI_CH0CONF_FFER_SHIFT)
 
#define MCSPI_RX_FIFO_DISABLE        ((uint32_t) CSL_MCSPI_CH0CONF_FFER_FFDISABLED \
                                      << CSL_MCSPI_CH0CONF_FFER_SHIFT)
 
#define MCSPI_TX_FIFO_ENABLE         ((uint32_t) CSL_MCSPI_CH0CONF_FFEW_FFENABLED \
                                      << CSL_MCSPI_CH0CONF_FFEW_SHIFT)
 
#define MCSPI_TX_FIFO_DISABLE        ((uint32_t) CSL_MCSPI_CH0CONF_FFEW_FFDISABLED \
                                      << CSL_MCSPI_CH0CONF_FFEW_SHIFT)
 
#define MCSPI_REG_OFFSET            (0x14U)
 
#define MCSPI_CHCONF(x)             ((uint32_t) CSL_MCSPI_CH0CONF +            \
                                     (uint32_t) ((uint32_t) MCSPI_REG_OFFSET * \
                                                 (uint32_t) (x)))
 
#define MCSPI_CHSTAT(x)             ((uint32_t) CSL_MCSPI_CH0STAT +            \
                                     (uint32_t) ((uint32_t) MCSPI_REG_OFFSET * \
                                                 (uint32_t) (x)))
 
#define MCSPI_CHCTRL(x)             ((uint32_t) CSL_MCSPI_CH0CTRL +            \
                                     (uint32_t) ((uint32_t) MCSPI_REG_OFFSET * \
                                                 (uint32_t) (x)))
 
#define MCSPI_CHTX(x)               ((uint32_t) CSL_MCSPI_TX0 +                \
                                     (uint32_t) ((uint32_t) MCSPI_REG_OFFSET * \
                                                 (uint32_t) (x)))
 
#define MCSPI_CHRX(x)               ((uint32_t) CSL_MCSPI_RX0 +                \
                                     (uint32_t) ((uint32_t) MCSPI_REG_OFFSET * \
                                                 (uint32_t) (x)))
 
#define MCSPI_CLKD_MASK             (0x0FU)
 
#define MCSPI_IRQSTATUS_CLEAR_ALL   (CSL_MCSPI_IRQSTATUS_EOW_MASK |            \
                                     CSL_MCSPI_IRQSTATUS_WKS_MASK |            \
                                     CSL_MCSPI_IRQSTATUS_RX3_FULL_MASK |       \
                                     CSL_MCSPI_IRQSTATUS_TX3_UNDERFLOW_MASK |  \
                                     CSL_MCSPI_IRQSTATUS_TX3_EMPTY_MASK |      \
                                     CSL_MCSPI_IRQSTATUS_RX2_FULL_MASK |       \
                                     CSL_MCSPI_IRQSTATUS_TX2_UNDERFLOW_MASK |  \
                                     CSL_MCSPI_IRQSTATUS_TX2_EMPTY_MASK |      \
                                     CSL_MCSPI_IRQSTATUS_RX1_FULL_MASK |       \
                                     CSL_MCSPI_IRQSTATUS_TX1_UNDERFLOW_MASK |  \
                                     CSL_MCSPI_IRQSTATUS_TX1_EMPTY_MASK |      \
                                     CSL_MCSPI_IRQSTATUS_RX0_OVERFLOW_MASK |   \
                                     CSL_MCSPI_IRQSTATUS_RX0_FULL_MASK |       \
                                     CSL_MCSPI_IRQSTATUS_TX0_UNDERFLOW_MASK |  \
                                     CSL_MCSPI_IRQSTATUS_TX0_EMPTY_MASK)
 
/* ========================================================================== */
/*                         Structure Declarations                             */
/* ========================================================================== */
 
typedef struct
{
    uint32_t                channel;
    uint32_t                csDisable;
    uint32_t                dataSize;
    uint32_t                count;
    void                   *txBuf;
    void                   *rxBuf;
    void                   *args;
    uint32_t                timeout;
    uint32_t                status;
} MCSPI_Transaction;
 
typedef struct MCSPI_ExtendedParams_s
{
    uint32_t                channel;
    uint32_t                csDisable;
    uint32_t               dataSize;
    void                   *args;
} MCSPI_ExtendedParams;
 
typedef struct
{
    uint32_t                chNum;
    uint32_t                frameFormat;
    uint32_t                bitRate;
    uint32_t                csPolarity;
    uint32_t                trMode;
    uint32_t                inputSelect;
    uint32_t                dpe0;
    uint32_t                dpe1;
    uint32_t                slvCsSelect;
    uint32_t                startBitEnable;
    uint32_t                startBitPolarity;
    uint32_t                turboEnable;
    uint32_t                csIdleTime;
    uint32_t                defaultTxData;
    uint32_t                txFifoTrigLvl;
    uint32_t                rxFifoTrigLvl;
} MCSPI_ChConfig;
 
/* ========================================================================== */
/*                      Function pointers Declarations                        */
/* ========================================================================== */
 
typedef void (*MCSPI_transferCallbackFxn) (void *args, uint32_t transferStatus);
 
typedef void (*MCSPI_errorCallbackFxn) (void *args, uint32_t transferStatus);
 
/* ========================================================================== */
/*                  Internal/Private Structure Declarations                   */
/* ========================================================================== */
 
typedef struct
{
    /*
     * User parameters
     */
    MCSPI_ChConfig  *chCfg;
    uint32_t        dmaChConfigNum;
    /*
     * State variables
     */
    uint32_t                isOpen;
    uint32_t                csDisable;
    uint32_t                csEnable;
    uint8_t                *curTxBufPtr;
    uint8_t                *curRxBufPtr;
    uint32_t                curTxWords;
    uint32_t                curRxWords;
    /*
     * MCSPI derived variables
     */
    uint8_t                 bufWidthShift;
    uint32_t                dataWidthBitMask;
    uint32_t                effTxFifoDepth;
    uint32_t                effRxFifoDepth;
    uint32_t                intrMask;
    MCSPI_DmaChConfig       dmaChCfg;
    uint32_t                chConfRegVal;
    uint32_t                chCtrlRegVal;
    uint32_t                systRegVal;
} MCSPI_ChObject;
 
typedef struct
{
    uint32_t                            inputClkFreq;
    uint32_t                            intrNum;
    uint32_t                            operMode;
    uint8_t                             intrPriority;
    uint32_t                            chMode;
    uint32_t                            pinMode;
    uint32_t                            initDelay;
    uint32_t                            multiWordAccess;
    uint32_t                            msMode;
    uint32_t                            chEnabled[MCSPI_MAX_NUM_CHANNELS];
    MCSPI_ChObject                      chObj[MCSPI_MAX_NUM_CHANNELS];
    MCSPI_DmaHandle                     mcspiDmaHandle;
    MCSPI_clockGet                      clockP_get;
    /* clock usec to tick */
    MCSPI_transferCallbackFxn           transferCallbackFxn;
    MCSPI_errorCallbackFxn              errorCallbackFxn;
} MCSPILLD_InitObject, *MCSPILLD_InitHandle;
 
typedef struct
{
    uint32_t                baseAddr;
    /*
     * User parameters
     */
    uint32_t                 state;
    void                    *transferMutex;
    MCSPILLD_InitHandle      hMcspiInit;
    uint32_t                 errorFlag;
    /*
     * Transfer parameters
     */
    uint32_t                transferChannel;
    uint32_t                transferCsDisable;
    uint32_t                transferDataSize;
    MCSPI_Transaction       transaction;
    void*                   args;
} MCSPILLD_Object, *MCSPILLD_Handle;
 
/* ========================================================================== */
/*                          Function Declarations                             */
/* ========================================================================== */
 
/* Low level HW functions */
void MCSPI_reset(uint32_t baseAddr);
void MCSPI_clearAllIrqStatus(uint32_t baseAddr);
void MCSPI_stop(MCSPILLD_Handle hMcspi, MCSPI_ChObject *chObj, uint32_t chNum);
void MCSPI_setChDataSize(uint32_t baseAddr, MCSPI_ChObject *chObj,
                         uint32_t dataSize, uint32_t csDisable);
 
static inline void MCSPI_intrStatusClear(const MCSPI_ChObject *chObj,
                                         uint32_t baseAddr, uint32_t intFlags)
{
    /* Clear the SSB bit in the MCSPI_SYST register. */
    CSL_REG32_WR(baseAddr + CSL_MCSPI_SYST, chObj->systRegVal);
    /* Clear the interrupt status. */
    CSL_REG32_WR(baseAddr + CSL_MCSPI_IRQSTATUS, intFlags);
}
 
/* ========================================================================== */
/*                          Function Declarations                             */
/* ========================================================================== */
 
int32_t MCSPI_lld_init(MCSPILLD_Handle hMcspi);
 
int32_t MCSPI_lld_initDma(MCSPILLD_Handle hMcspi);
int32_t MCSPI_lld_deInit(MCSPILLD_Handle hMcspi);
 
int32_t MCSPI_lld_deInitDma(MCSPILLD_Handle hMcspi);
 
int32_t MCSPI_lld_write(MCSPILLD_Handle hMcspi, void *txBuf, uint32_t count, uint32_t timeout,
                        const MCSPI_ExtendedParams *extendedParams);
 
int32_t MCSPI_lld_writeIntr(MCSPILLD_Handle hMcspi, void *txBuf, uint32_t count, uint32_t timeout,
                            const MCSPI_ExtendedParams *extendedParams);
 
int32_t MCSPI_lld_writeDma(MCSPILLD_Handle hMcspi, void * txBuf, uint32_t count,
                           uint32_t timeout, const MCSPI_ExtendedParams *extendedParams);
 
int32_t MCSPI_lld_read(MCSPILLD_Handle hMcspi, void * rxBuf, uint32_t count, uint32_t timeout,
                       const MCSPI_ExtendedParams *extendedParams);
 
int32_t MCSPI_lld_readIntr(MCSPILLD_Handle hMcspi, void * rxBuf, uint32_t count, uint32_t timeout,
                           const MCSPI_ExtendedParams *extendedParams);
 
int32_t MCSPI_lld_readDma(MCSPILLD_Handle hMcspi, void * rxBuf, uint32_t count,
                          uint32_t timeout, const MCSPI_ExtendedParams *extendedParams);
int32_t MCSPI_lld_readWrite(MCSPILLD_Handle hMcspi, void *txBuf, void *rxBuf, uint32_t count,
                            uint32_t timeout, const MCSPI_ExtendedParams *extendedParams);
int32_t MCSPI_lld_readWriteIntr(MCSPILLD_Handle hMcspi, void *txBuf, void *rxBuf, uint32_t count,
                                uint32_t timeout, const MCSPI_ExtendedParams *extendedParams);
int32_t MCSPI_lld_readWriteDma(MCSPILLD_Handle hMcspi, void *txBuf, void *rxBuf, uint32_t count,
                               uint32_t timeout, const MCSPI_ExtendedParams *extendedParams);
 
int32_t MCSPI_lld_readWriteCancel(MCSPILLD_Handle hMcspi);
 
int32_t MCSPI_lld_readWriteDmaCancel(MCSPILLD_Handle hMcspi);
 
int32_t MCSPI_lld_transfer(MCSPILLD_Handle hMcspi, MCSPI_Transaction *transaction);
 
int32_t MCSPI_lld_transferIntr(MCSPILLD_Handle hMcspi, MCSPI_Transaction *transaction);
 
int32_t MCSPI_lld_transferDma(MCSPILLD_Handle hMcspi, MCSPI_Transaction *transaction);
 
void MCSPI_lld_controllerIsr(void* args);
 
void MCSPI_lld_peripheralIsr(void* args);
 
int32_t MCSPI_lld_getState(MCSPILLD_Handle hMcspi);
 
int32_t MCSPI_lld_transferCancel(MCSPILLD_Handle hMcspi);
 
int32_t MCSPI_lld_transferDmaCancel(MCSPILLD_Handle hMcspi);
 
static inline void MCSPI_lld_ChConfig_init(MCSPI_ChConfig *chConfig);
 
static inline void MCSPI_lld_Transaction_init(MCSPI_Transaction *trans);
 
uint32_t MCSPI_lld_getBaseAddr(MCSPILLD_Handle handle);
 
int32_t MCSPI_lld_reConfigFifo(MCSPILLD_Handle handle,
                               uint32_t chNum,
                               uint32_t numWordsRxTx);
 
static inline uint8_t MCSPI_getBufWidthShift(uint32_t dataSize);
 
static inline uint32_t MCSPI_readChStatusReg(uint32_t baseAddr, uint32_t chNum);
 
static inline uint32_t MCSPI_readChCtrlReg(uint32_t baseAddr, uint32_t chNum);
 
static inline void MCSPI_writeChCtrlReg(uint32_t baseAddr, uint32_t chNum,
                       uint32_t regVal);
 
static inline uint32_t MCSPI_readChConf(uint32_t baseAddr, uint32_t chNum);
 
static inline void MCSPI_writeChConfReg(uint32_t baseAddr, uint32_t chNum,
                       uint32_t regVal);
 
static inline void MCSPI_writeTxDataReg(uint32_t baseAddr,
                                        uint32_t txData,
                                        uint32_t chNum);
 
static inline void MCSPI_enableTxFIFO(uint32_t baseAddr, uint32_t chNum,
                                      uint32_t enableFlag);
 
static inline void MCSPI_enableRxFIFO(uint32_t baseAddr, uint32_t chNum,
                                      uint32_t enableFlag);
 
static inline uint32_t MCSPI_readRxDataReg(uint32_t baseAddr,
                                           uint32_t chNum);
 
static inline void MCSPI_setDataWidth(uint32_t baseAddr, uint32_t chNum,
                                      uint32_t dataWidth);
 
/* ========================================================================== */
/*                       Static Function Definitions                          */
/* ========================================================================== */
 
static inline void MCSPI_lld_ChConfig_init(MCSPI_ChConfig *chConfig)
{
    if(chConfig != NULL)
    {
        chConfig->chNum             = MCSPI_CHANNEL_0;
        chConfig->frameFormat       = MCSPI_FF_POL0_PHA0;
        chConfig->bitRate           = 1000000U;
        chConfig->csPolarity        = MCSPI_CS_POL_LOW;
        chConfig->trMode            = MCSPI_TR_MODE_TX_RX;
        chConfig->inputSelect       = MCSPI_IS_D1;
        chConfig->dpe0              = MCSPI_DPE_ENABLE;
        chConfig->dpe1              = MCSPI_DPE_DISABLE;
        chConfig->slvCsSelect       = MCSPI_SLV_CS_SELECT_0;
        chConfig->startBitEnable    = FALSE;
        chConfig->startBitPolarity  = MCSPI_SB_POL_LOW;
        chConfig->csIdleTime        = MCSPI_TCS0_0_CLK;
        chConfig->defaultTxData     = 0x00000000U;
    }
}
 
static inline void MCSPI_lld_Transaction_init(MCSPI_Transaction *trans)
{
    if(trans != NULL)
    {
        trans->channel   = 0U;
        trans->csDisable = TRUE;
        trans->dataSize  = 8U;
        trans->count     = 0U;
        trans->txBuf     = NULL;
        trans->rxBuf     = NULL;
        trans->args      = NULL;
        trans->timeout   = MCSPI_WAIT_FOREVER;
    }
}
 
static inline uint8_t MCSPI_getBufWidthShift(uint32_t dataSize)
{
    uint8_t bufWidthShift = 0U;
 
    if(dataSize <= 8U)
    {
        bufWidthShift = 0U;
    }
    else if(dataSize <= 16U)
    {
        bufWidthShift = 1U;
    }
    else
    {
        bufWidthShift = 2U;
    }
 
    return bufWidthShift;
}
 
static inline uint32_t MCSPI_readChStatusReg(uint32_t baseAddr, uint32_t chNum)
{
    /* Return the status from MCSPI_CHSTAT register. */
    return (CSL_REG32_RD(baseAddr + MCSPI_CHSTAT(chNum)));
}
 
static inline uint32_t MCSPI_readChCtrlReg(uint32_t baseAddr, uint32_t chNum)
{
    return CSL_REG32_RD(baseAddr + MCSPI_CHCTRL(chNum));
}
 
static inline void MCSPI_writeChCtrlReg(uint32_t baseAddr, uint32_t chNum,
                                        uint32_t regVal)
{
    CSL_REG32_WR(baseAddr + MCSPI_CHCTRL(chNum), regVal);
}
 
static inline uint32_t MCSPI_readChConf(uint32_t baseAddr, uint32_t chNum)
{
    return CSL_REG32_RD(baseAddr + MCSPI_CHCONF(chNum));
}
 
static inline void MCSPI_writeChConfReg(uint32_t baseAddr, uint32_t chNum,
                                        uint32_t regVal)
{
    CSL_REG32_WR(baseAddr + MCSPI_CHCONF(chNum), regVal);
}
 
static inline void MCSPI_writeTxDataReg(uint32_t baseAddr,
                                        uint32_t txData,
                                        uint32_t chNum)
{
    /* Load the MCSPI_TX register with the data to be transmitted */
    CSL_REG32_WR(baseAddr + MCSPI_CHTX(chNum), txData);
}
 
static inline void MCSPI_enableTxFIFO(uint32_t baseAddr,
                                      uint32_t chNum,
                                      uint32_t enableFlag)
{
    /* Set the FFEW field with user sent value. */
    CSL_REG32_FINS(
        baseAddr + MCSPI_CHCONF(chNum),
        MCSPI_CH0CONF_FFEW,
        enableFlag >> CSL_MCSPI_CH0CONF_FFEW_SHIFT);
}
 
static inline void MCSPI_enableRxFIFO(uint32_t baseAddr,
                                      uint32_t chNum,
                                      uint32_t enableFlag)
{
    /* Set the FFER field with the user sent value. */
    CSL_REG32_FINS(
        baseAddr + MCSPI_CHCONF(chNum),
        MCSPI_CH0CONF_FFER,
        enableFlag >> CSL_MCSPI_CH0CONF_FFER_SHIFT);
}
 
static inline uint32_t MCSPI_readRxDataReg(uint32_t baseAddr, uint32_t chNum)
{
    /* Return the data present in the MCSPI_RX register. */
    return (CSL_REG32_RD(baseAddr + MCSPI_CHRX(chNum)));
}
 
static inline void MCSPI_setDataWidth(uint32_t baseAddr, uint32_t chNum,
                                      uint32_t dataWidth)
{
    uint32_t regVal;
 
    regVal = CSL_REG32_RD(baseAddr + MCSPI_CHCONF(chNum));
    CSL_FINS(regVal, MCSPI_CH0CONF_WL, (dataWidth - 1U));
    CSL_REG32_WR(baseAddr + MCSPI_CHCONF(chNum), regVal);
}
 
#ifdef __cplusplus
}
#endif
 
#endif /* #ifndef MCSPI_LLD_H_ */