Overview

The MCUXpresso SDK provides a peripheral driver for an SPI function using the Flexible I/O module of MCUXpresso SDK devices.

FlexIO SPI driver includes functional APIs and transactional APIs.

Functional APIs target low-level APIs. Functional APIs can be used for FlexIO SPI initialization/configuration/operation for optimization/customization purpose. Using the functional API requires the knowledge of the FlexIO SPI peripheral and how to organize functional APIs to meet the application requirements. All functional API use the FLEXIO_SPI_Type *base as the first parameter. FlexIO SPI functional operation groups provide the functional API set.

Transactional APIs target high-level APIs. Transactional APIs can be used to enable the peripheral and also in the application if the code size and performance of transactional APIs can satisfy requirements. If the code size and performance are critical requirements, see the transactional API implementation and write custom code. All transactional APIs use the flexio_spi_master_handle_t/flexio_spi_slave_handle_t as the second parameter. Initialize the handle by calling the FLEXIO_SPI_MasterTransferCreateHandle() or FLEXIO_SPI_SlaveTransferCreateHandle() API.

Transactional APIs support asynchronous transfer. This means that the functions FLEXIO_SPI_MasterTransferNonBlocking()/FLEXIO_SPI_SlaveTransferNonBlocking() set up an interrupt for data transfer. When the transfer is complete, the upper layer is notified through a callback function with the kStatus_FLEXIO_SPI_Idle status.

Note that the FlexIO SPI slave driver only supports discontinuous PCS access, which is a limitation. The FlexIO SPI slave driver can support continuous PCS, but the slave cannot adapt discontinuous and continuous PCS automatically. Users can change the timer disable mode in FLEXIO_SPI_SlaveInit manually, from kFLEXIO_TimerDisableOnTimerCompare to kFLEXIO_TimerDisableNever to enable a discontinuous PCS access. Only CPHA = 0 is supported.

Typical use case

FlexIO SPI send/receive using an interrupt method

flexio_spi_master_handle_t g_spiHandle;
FLEXIO_SPI_Type spiDev;
volatile bool txFinished;
static uint8_t srcBuff[BUFFER_SIZE];
static uint8_t destBuff[BUFFER_SIZE];
void FLEXIO_SPI_MasterUserCallback(FLEXIO_SPI_Type *base, flexio_spi_master_handle_t *handle, status_t status, void *userData)
{
    userData = userData;
    if (kStatus_FLEXIO_SPI_Idle == status)
    {
        txFinished = true;
    }
}
void main(void)
{
    //...
    flexio_spi_transfer_t xfer = {0};
    flexio_spi_master_config_t userConfig;
    FLEXIO_SPI_MasterGetDefaultConfig(&userConfig);
    userConfig.baudRate_Bps = 500000U;
    spiDev.flexioBase = BOARD_FLEXIO_BASE;
    spiDev.SDOPinIndex = FLEXIO_SPI_MOSI_PIN;
    spiDev.SDIPinIndex = FLEXIO_SPI_MISO_PIN;
    spiDev.SCKPinIndex = FLEXIO_SPI_SCK_PIN;
    spiDev.CSnPinIndex = FLEXIO_SPI_CSn_PIN;
    spiDev.shifterIndex[0] = 0U;
    spiDev.shifterIndex[1] = 1U;
    spiDev.timerIndex[0] = 0U;
    spiDev.timerIndex[1] = 1U;
    FLEXIO_SPI_MasterInit(&spiDev, &userConfig, FLEXIO_CLOCK_FREQUENCY);
    xfer.txData = srcBuff;
    xfer.rxData = destBuff;
    xfer.dataSize = BUFFER_SIZE;
    xfer.flags = kFLEXIO_SPI_8bitMsb;
    FLEXIO_SPI_MasterTransferCreateHandle(&spiDev, &g_spiHandle, FLEXIO_SPI_MasterUserCallback, NULL);
    FLEXIO_SPI_MasterTransferNonBlocking(&spiDev, &g_spiHandle, &xfer);
    // Send finished.
    while (!txFinished)
    {
    }
        // ...
}

FlexIO_SPI Send/Receive in DMA way

    dma_handle_t g_spiTxDmaHandle;
    dma_handle_t g_spiRxDmaHandle;
    flexio_spi_master_handle_t g_spiHandle;
    FLEXIO_SPI_Type spiDev;
    volatile bool txFinished;
    static uint8_t srcBuff[BUFFER_SIZE];
    static uint8_t destBuff[BUFFER_SIZE];
    void FLEXIO_SPI_MasterUserCallback(FLEXIO_SPI_Type *base, flexio_spi_master_dma_handle_t *handle, status_t status, void *userData)
    {
        userData = userData;
        if (kStatus_FLEXIO_SPI_Idle == status)
        {
            txFinished = true;
        }
    }
    void main(void)
    {
        flexio_spi_transfer_t xfer = {0};
        flexio_spi_master_config_t userConfig;
        FLEXIO_SPI_MasterGetDefaultConfig(&userConfig);
        userConfig.baudRate_Bps = 500000U;
        spiDev.flexioBase = BOARD_FLEXIO_BASE;
        spiDev.SDOPinIndex = FLEXIO_SPI_MOSI_PIN;
        spiDev.SDIPinIndex = FLEXIO_SPI_MISO_PIN;
        spiDev.SCKPinIndex = FLEXIO_SPI_SCK_PIN;
        spiDev.CSnPinIndex = FLEXIO_SPI_CSn_PIN;
        spiDev.shifterIndex[0] = 0U;
        spiDev.shifterIndex[1] = 1U;
        spiDev.timerIndex[0] = 0U;
        spiDev.timerIndex[1] = 1U;
        /* Init DMAMUX. */
        DMAMUX_Init(EXAMPLE_FLEXIO_SPI_DMAMUX_BASEADDR)
        /* Init the DMA/EDMA module */
#if defined(FSL_FEATURE_SOC_DMA_COUNT) && FSL_FEATURE_SOC_DMA_COUNT > 0U
        DMA_Init(EXAMPLE_FLEXIO_SPI_DMA_BASEADDR);
        DMA_CreateHandle(&txHandle, EXAMPLE_FLEXIO_SPI_DMA_BASEADDR, FLEXIO_SPI_TX_DMA_CHANNEL);
        DMA_CreateHandle(&rxHandle, EXAMPLE_FLEXIO_SPI_DMA_BASEADDR, FLEXIO_SPI_RX_DMA_CHANNEL);
#endif /* FSL_FEATURE_SOC_DMA_COUNT */
#if defined(FSL_FEATURE_SOC_EDMA_COUNT) && FSL_FEATURE_SOC_EDMA_COUNT > 0U
        edma_config_t edmaConfig;
        EDMA_GetDefaultConfig(&edmaConfig);
        EDMA_Init(EXAMPLE_FLEXIO_SPI_DMA_BASEADDR, &edmaConfig);
        EDMA_CreateHandle(&txHandle, EXAMPLE_FLEXIO_SPI_DMA_BASEADDR, FLEXIO_SPI_TX_DMA_CHANNEL);
        EDMA_CreateHandle(&rxHandle, EXAMPLE_FLEXIO_SPI_DMA_BASEADDR, FLEXIO_SPI_RX_DMA_CHANNEL);
#endif /* FSL_FEATURE_SOC_EDMA_COUNT */
        dma_request_source_tx = (dma_request_source_t)(FLEXIO_DMA_REQUEST_BASE + spiDev.shifterIndex[0]);
        dma_request_source_rx = (dma_request_source_t)(FLEXIO_DMA_REQUEST_BASE + spiDev.shifterIndex[1]);
        /* Requests  DMA channels for transmit and receive. */
        DMAMUX_SetSource(EXAMPLE_FLEXIO_SPI_DMAMUX_BASEADDR, FLEXIO_SPI_TX_DMA_CHANNEL, (dma_request_source_t)dma_request_source_tx);
        DMAMUX_SetSource(EXAMPLE_FLEXIO_SPI_DMAMUX_BASEADDR, FLEXIO_SPI_RX_DMA_CHANNEL, (dma_request_source_t)dma_request_source_rx);
        DMAMUX_EnableChannel(EXAMPLE_FLEXIO_SPI_DMAMUX_BASEADDR, FLEXIO_SPI_TX_DMA_CHANNEL);
        DMAMUX_EnableChannel(EXAMPLE_FLEXIO_SPI_DMAMUX_BASEADDR, FLEXIO_SPI_RX_DMA_CHANNEL);
        FLEXIO_SPI_MasterInit(&spiDev, &userConfig, FLEXIO_CLOCK_FREQUENCY);
        /* Initializes the buffer. */
        for (i = 0; i < BUFFER_SIZE; i++)
        {
            srcBuff[i] = i;
        }
        /* Sends to the slave. */
        xfer.txData = srcBuff;
        xfer.rxData = destBuff;
        xfer.dataSize = BUFFER_SIZE;
        xfer.flags = kFLEXIO_SPI_8bitMsb;
        FLEXIO_SPI_MasterTransferCreateHandleDMA(&spiDev, &g_spiHandle, FLEXIO_SPI_MasterUserCallback, NULL, &g_spiTxDmaHandle, &g_spiRxDmaHandle);
        FLEXIO_SPI_MasterTransferDMA(&spiDev, &g_spiHandle, &xfer);
        // Send finished.
        while (!txFinished)
        {
        }
        // ...
    }

Data Structures
struct	FLEXIO_SPI_Type
	Define FlexIO SPI access structure typedef. More...

struct	flexio_spi_master_config_t
	Define FlexIO SPI master configuration structure. More...

struct	flexio_spi_slave_config_t
	Define FlexIO SPI slave configuration structure. More...

struct	flexio_spi_transfer_t
	Define FlexIO SPI transfer structure. More...

struct	flexio_spi_master_handle_t
	Define FlexIO SPI handle structure. More...

Macros
#define	FLEXIO_SPI_DUMMYDATA (0xFFFFU)
	FlexIO SPI dummy transfer data, the data is sent while txData is NULL. More...

#define	SPI_RETRY_TIMES 0U /* Define to zero means keep waiting until the flag is assert/deassert. */
	Retry times for waiting flag. More...

Typedefs
typedef flexio_spi_master_handle_t	flexio_spi_slave_handle_t
	Slave handle is the same with master handle. More...

typedef void(*	flexio_spi_master_transfer_callback_t )(FLEXIO_SPI_Type base, flexio_spi_master_handle_t handle, status_t status, void *userData)
	FlexIO SPI master callback for finished transmit.

typedef void(*	flexio_spi_slave_transfer_callback_t )(FLEXIO_SPI_Type base, flexio_spi_slave_handle_t handle, status_t status, void *userData)
	FlexIO SPI slave callback for finished transmit.

Enumerations
enum	{ kStatus_FLEXIO_SPI_Busy = MAKE_STATUS(kStatusGroup_FLEXIO_SPI, 1), kStatus_FLEXIO_SPI_Idle = MAKE_STATUS(kStatusGroup_FLEXIO_SPI, 2), kStatus_FLEXIO_SPI_Error = MAKE_STATUS(kStatusGroup_FLEXIO_SPI, 3), kStatus_FLEXIO_SPI_Timeout }
	Error codes for the FlexIO SPI driver. More...

enum	flexio_spi_clock_phase_t { kFLEXIO_SPI_ClockPhaseFirstEdge = 0x0U, kFLEXIO_SPI_ClockPhaseSecondEdge = 0x1U }
	FlexIO SPI clock phase configuration. More...

enum	flexio_spi_shift_direction_t { kFLEXIO_SPI_MsbFirst = 0, kFLEXIO_SPI_LsbFirst = 1 }
	FlexIO SPI data shifter direction options. More...

enum	flexio_spi_data_bitcount_mode_t { kFLEXIO_SPI_8BitMode = 0x08U, kFLEXIO_SPI_16BitMode = 0x10U }
	FlexIO SPI data length mode options. More...

enum	_flexio_spi_interrupt_enable { kFLEXIO_SPI_TxEmptyInterruptEnable = 0x1U, kFLEXIO_SPI_RxFullInterruptEnable = 0x2U }
	Define FlexIO SPI interrupt mask. More...

enum	_flexio_spi_status_flags { kFLEXIO_SPI_TxBufferEmptyFlag = 0x1U, kFLEXIO_SPI_RxBufferFullFlag = 0x2U }
	Define FlexIO SPI status mask. More...

enum	_flexio_spi_dma_enable { kFLEXIO_SPI_TxDmaEnable = 0x1U, kFLEXIO_SPI_RxDmaEnable = 0x2U, kFLEXIO_SPI_DmaAllEnable = 0x3U }
	Define FlexIO SPI DMA mask. More...

enum	_flexio_spi_transfer_flags { kFLEXIO_SPI_8bitMsb = 0x1U, kFLEXIO_SPI_8bitLsb = 0x2U, kFLEXIO_SPI_16bitMsb = 0x9U, kFLEXIO_SPI_16bitLsb = 0xaU }
	Define FlexIO SPI transfer flags. More...

Driver version
#define	FSL_FLEXIO_SPI_DRIVER_VERSION (MAKE_VERSION(2, 2, 0))
	FlexIO SPI driver version 2.2.0. More...

FlexIO SPI Configuration
void	FLEXIO_SPI_MasterInit (FLEXIO_SPI_Type base, flexio_spi_master_config_t masterConfig, uint32_t srcClock_Hz)
	Ungates the FlexIO clock, resets the FlexIO module, configures the FlexIO SPI master hardware, and configures the FlexIO SPI with FlexIO SPI master configuration. More...

void	FLEXIO_SPI_MasterDeinit (FLEXIO_SPI_Type *base)
	Resets the FlexIO SPI timer and shifter config. More...

void	FLEXIO_SPI_MasterGetDefaultConfig (flexio_spi_master_config_t *masterConfig)
	Gets the default configuration to configure the FlexIO SPI master. More...

void	FLEXIO_SPI_SlaveInit (FLEXIO_SPI_Type base, flexio_spi_slave_config_t slaveConfig)
	Ungates the FlexIO clock, resets the FlexIO module, configures the FlexIO SPI slave hardware configuration, and configures the FlexIO SPI with FlexIO SPI slave configuration. More...

void	FLEXIO_SPI_SlaveDeinit (FLEXIO_SPI_Type *base)
	Gates the FlexIO clock. More...

void	FLEXIO_SPI_SlaveGetDefaultConfig (flexio_spi_slave_config_t *slaveConfig)
	Gets the default configuration to configure the FlexIO SPI slave. More...

Status
uint32_t	FLEXIO_SPI_GetStatusFlags (FLEXIO_SPI_Type *base)
	Gets FlexIO SPI status flags. More...

void	FLEXIO_SPI_ClearStatusFlags (FLEXIO_SPI_Type *base, uint32_t mask)
	Clears FlexIO SPI status flags. More...

Interrupts
void	FLEXIO_SPI_EnableInterrupts (FLEXIO_SPI_Type *base, uint32_t mask)
	Enables the FlexIO SPI interrupt. More...

void	FLEXIO_SPI_DisableInterrupts (FLEXIO_SPI_Type *base, uint32_t mask)
	Disables the FlexIO SPI interrupt. More...

DMA Control
void	FLEXIO_SPI_EnableDMA (FLEXIO_SPI_Type *base, uint32_t mask, bool enable)
	Enables/disables the FlexIO SPI transmit DMA. More...

static uint32_t	FLEXIO_SPI_GetTxDataRegisterAddress (FLEXIO_SPI_Type *base, flexio_spi_shift_direction_t direction)
	Gets the FlexIO SPI transmit data register address for MSB first transfer. More...

static uint32_t	FLEXIO_SPI_GetRxDataRegisterAddress (FLEXIO_SPI_Type *base, flexio_spi_shift_direction_t direction)
	Gets the FlexIO SPI receive data register address for the MSB first transfer. More...

Bus Operations
static void	FLEXIO_SPI_Enable (FLEXIO_SPI_Type *base, bool enable)
	Enables/disables the FlexIO SPI module operation. More...

void	FLEXIO_SPI_MasterSetBaudRate (FLEXIO_SPI_Type *base, uint32_t baudRate_Bps, uint32_t srcClockHz)
	Sets baud rate for the FlexIO SPI transfer, which is only used for the master. More...

static void	FLEXIO_SPI_WriteData (FLEXIO_SPI_Type *base, flexio_spi_shift_direction_t direction, uint16_t data)
	Writes one byte of data, which is sent using the MSB method. More...

static uint16_t	FLEXIO_SPI_ReadData (FLEXIO_SPI_Type *base, flexio_spi_shift_direction_t direction)
	Reads 8 bit/16 bit data. More...

status_t	FLEXIO_SPI_WriteBlocking (FLEXIO_SPI_Type base, flexio_spi_shift_direction_t direction, const uint8_t buffer, size_t size)
	Sends a buffer of data bytes. More...

status_t	FLEXIO_SPI_ReadBlocking (FLEXIO_SPI_Type base, flexio_spi_shift_direction_t direction, uint8_t buffer, size_t size)
	Receives a buffer of bytes. More...

status_t	FLEXIO_SPI_MasterTransferBlocking (FLEXIO_SPI_Type base, flexio_spi_transfer_t xfer)
	Receives a buffer of bytes. More...

Transactional
status_t	FLEXIO_SPI_MasterTransferCreateHandle (FLEXIO_SPI_Type base, flexio_spi_master_handle_t handle, flexio_spi_master_transfer_callback_t callback, void *userData)
	Initializes the FlexIO SPI Master handle, which is used in transactional functions. More...

status_t	FLEXIO_SPI_MasterTransferNonBlocking (FLEXIO_SPI_Type base, flexio_spi_master_handle_t handle, flexio_spi_transfer_t *xfer)
	Master transfer data using IRQ. More...

void	FLEXIO_SPI_MasterTransferAbort (FLEXIO_SPI_Type base, flexio_spi_master_handle_t handle)
	Aborts the master data transfer, which used IRQ. More...

status_t	FLEXIO_SPI_MasterTransferGetCount (FLEXIO_SPI_Type base, flexio_spi_master_handle_t handle, size_t *count)
	Gets the data transfer status which used IRQ. More...

void	FLEXIO_SPI_MasterTransferHandleIRQ (void spiType, void spiHandle)
	FlexIO SPI master IRQ handler function. More...

status_t	FLEXIO_SPI_SlaveTransferCreateHandle (FLEXIO_SPI_Type base, flexio_spi_slave_handle_t handle, flexio_spi_slave_transfer_callback_t callback, void *userData)
	Initializes the FlexIO SPI Slave handle, which is used in transactional functions. More...

status_t	FLEXIO_SPI_SlaveTransferNonBlocking (FLEXIO_SPI_Type base, flexio_spi_slave_handle_t handle, flexio_spi_transfer_t *xfer)
	Slave transfer data using IRQ. More...

static void	FLEXIO_SPI_SlaveTransferAbort (FLEXIO_SPI_Type base, flexio_spi_slave_handle_t handle)
	Aborts the slave data transfer which used IRQ, share same API with master. More...

static status_t	FLEXIO_SPI_SlaveTransferGetCount (FLEXIO_SPI_Type base, flexio_spi_slave_handle_t handle, size_t *count)
	Gets the data transfer status which used IRQ, share same API with master. More...

void	FLEXIO_SPI_SlaveTransferHandleIRQ (void spiType, void spiHandle)
	FlexIO SPI slave IRQ handler function. More...

Data Structure Documentation

struct FLEXIO_SPI_Type

Data Fields
FLEXIO_Type *	flexioBase
	FlexIO base pointer. More...

uint8_t	SDOPinIndex
	Pin select for data output. More...

uint8_t	SDIPinIndex
	Pin select for data input. More...

uint8_t	SCKPinIndex
	Pin select for clock. More...

uint8_t	CSnPinIndex
	Pin select for enable. More...

uint8_t	shifterIndex [2]
	Shifter index used in FlexIO SPI. More...

uint8_t	timerIndex [2]
	Timer index used in FlexIO SPI. More...

Field Documentation

FLEXIO_Type* FLEXIO_SPI_Type::flexioBase

uint8_t FLEXIO_SPI_Type::SDOPinIndex

uint8_t FLEXIO_SPI_Type::SDIPinIndex

uint8_t FLEXIO_SPI_Type::SCKPinIndex

uint8_t FLEXIO_SPI_Type::CSnPinIndex

uint8_t FLEXIO_SPI_Type::shifterIndex[2]

uint8_t FLEXIO_SPI_Type::timerIndex[2]

struct flexio_spi_master_config_t

Data Fields
bool	enableMaster
	Enable/disable FlexIO SPI master after configuration. More...

bool	enableInDoze
	Enable/disable FlexIO operation in doze mode. More...

bool	enableInDebug
	Enable/disable FlexIO operation in debug mode. More...

bool	enableFastAccess
	Enable/disable fast access to FlexIO registers, fast access requires the FlexIO clock to be at least twice the frequency of the bus clock. More...

uint32_t	baudRate_Bps
	Baud rate in Bps. More...

flexio_spi_clock_phase_t	phase
	Clock phase. More...

flexio_spi_data_bitcount_mode_t	dataMode
	8bit or 16bit mode. More...

Field Documentation

bool flexio_spi_master_config_t::enableMaster

bool flexio_spi_master_config_t::enableInDoze

bool flexio_spi_master_config_t::enableInDebug

bool flexio_spi_master_config_t::enableFastAccess

uint32_t flexio_spi_master_config_t::baudRate_Bps

flexio_spi_clock_phase_t flexio_spi_master_config_t::phase

flexio_spi_data_bitcount_mode_t flexio_spi_master_config_t::dataMode

struct flexio_spi_slave_config_t

Data Fields
bool	enableSlave
	Enable/disable FlexIO SPI slave after configuration. More...

bool	enableInDoze
	Enable/disable FlexIO operation in doze mode. More...

bool	enableInDebug
	Enable/disable FlexIO operation in debug mode. More...

bool	enableFastAccess
	Enable/disable fast access to FlexIO registers, fast access requires the FlexIO clock to be at least twice the frequency of the bus clock. More...

flexio_spi_clock_phase_t	phase
	Clock phase. More...

flexio_spi_data_bitcount_mode_t	dataMode
	8bit or 16bit mode. More...

Field Documentation

bool flexio_spi_slave_config_t::enableSlave

bool flexio_spi_slave_config_t::enableInDoze

bool flexio_spi_slave_config_t::enableInDebug

bool flexio_spi_slave_config_t::enableFastAccess

flexio_spi_clock_phase_t flexio_spi_slave_config_t::phase

flexio_spi_data_bitcount_mode_t flexio_spi_slave_config_t::dataMode

struct flexio_spi_transfer_t

Data Fields
uint8_t *	txData
	Send buffer. More...

uint8_t *	rxData
	Receive buffer. More...

size_t	dataSize
	Transfer bytes. More...

uint8_t	flags
	FlexIO SPI control flag, MSB first or LSB first. More...

Field Documentation

uint8_t* flexio_spi_transfer_t::txData

uint8_t* flexio_spi_transfer_t::rxData

size_t flexio_spi_transfer_t::dataSize

uint8_t flexio_spi_transfer_t::flags

struct _flexio_spi_master_handle

typedef for flexio_spi_master_handle_t in advance.

Data Fields
uint8_t *	txData
	Transfer buffer. More...

uint8_t *	rxData
	Receive buffer. More...

size_t	transferSize
	Total bytes to be transferred. More...

volatile size_t	txRemainingBytes
	Send data remaining in bytes. More...

volatile size_t	rxRemainingBytes
	Receive data remaining in bytes. More...

volatile uint32_t	state
	FlexIO SPI internal state. More...

uint8_t	bytePerFrame
	SPI mode, 2bytes or 1byte in a frame.

flexio_spi_shift_direction_t	direction
	Shift direction. More...

flexio_spi_master_transfer_callback_t	callback
	FlexIO SPI callback. More...

void *	userData
	Callback parameter. More...

Field Documentation

uint8_t* flexio_spi_master_handle_t::txData

uint8_t* flexio_spi_master_handle_t::rxData

size_t flexio_spi_master_handle_t::transferSize

volatile size_t flexio_spi_master_handle_t::txRemainingBytes

volatile size_t flexio_spi_master_handle_t::rxRemainingBytes

volatile uint32_t flexio_spi_master_handle_t::state

flexio_spi_shift_direction_t flexio_spi_master_handle_t::direction

flexio_spi_master_transfer_callback_t flexio_spi_master_handle_t::callback

void* flexio_spi_master_handle_t::userData

Macro Definition Documentation

#define FSL_FLEXIO_SPI_DRIVER_VERSION (MAKE_VERSION(2, 2, 0))

#define FLEXIO_SPI_DUMMYDATA (0xFFFFU)

#define SPI_RETRY_TIMES 0U /* Define to zero means keep waiting until the flag is assert/deassert. */

Typedef Documentation

typedef flexio_spi_master_handle_t flexio_spi_slave_handle_t

Enumeration Type Documentation

anonymous enum

Enumerator
kStatus_FLEXIO_SPI_Busy	FlexIO SPI is busy.
kStatus_FLEXIO_SPI_Idle	SPI is idle.
kStatus_FLEXIO_SPI_Error	FlexIO SPI error.
kStatus_FLEXIO_SPI_Timeout	FlexIO SPI timeout polling status flags.

enum flexio_spi_clock_phase_t

Enumerator
kFLEXIO_SPI_ClockPhaseFirstEdge	First edge on SPSCK occurs at the middle of the first cycle of a data transfer.
kFLEXIO_SPI_ClockPhaseSecondEdge	First edge on SPSCK occurs at the start of the first cycle of a data transfer.

enum flexio_spi_shift_direction_t

Enumerator
kFLEXIO_SPI_MsbFirst	Data transfers start with most significant bit.
kFLEXIO_SPI_LsbFirst	Data transfers start with least significant bit.

enum flexio_spi_data_bitcount_mode_t

Enumerator
kFLEXIO_SPI_8BitMode	8-bit data transmission mode.
kFLEXIO_SPI_16BitMode	16-bit data transmission mode.

enum _flexio_spi_interrupt_enable

Enumerator
kFLEXIO_SPI_TxEmptyInterruptEnable	Transmit buffer empty interrupt enable.
kFLEXIO_SPI_RxFullInterruptEnable	Receive buffer full interrupt enable.

enum _flexio_spi_status_flags

Enumerator
kFLEXIO_SPI_TxBufferEmptyFlag	Transmit buffer empty flag.
kFLEXIO_SPI_RxBufferFullFlag	Receive buffer full flag.

enum _flexio_spi_dma_enable

Enumerator
kFLEXIO_SPI_TxDmaEnable	Tx DMA request source.
kFLEXIO_SPI_RxDmaEnable	Rx DMA request source.
kFLEXIO_SPI_DmaAllEnable	All DMA request source.

enum _flexio_spi_transfer_flags

Enumerator
kFLEXIO_SPI_8bitMsb	FlexIO SPI 8-bit MSB first.
kFLEXIO_SPI_8bitLsb	FlexIO SPI 8-bit LSB first.
kFLEXIO_SPI_16bitMsb	FlexIO SPI 16-bit MSB first.
kFLEXIO_SPI_16bitLsb	FlexIO SPI 16-bit LSB first.

Function Documentation

void FLEXIO_SPI_MasterInit	(	FLEXIO_SPI_Type *	base,
		flexio_spi_master_config_t *	masterConfig,
		uint32_t	srcClock_Hz
	)

The configuration structure can be filled by the user, or be set with default values by the FLEXIO_SPI_MasterGetDefaultConfig().

Note: 1.FlexIO SPI master only support CPOL = 0, which means clock inactive low. 2.For FlexIO SPI master, the input valid time is 1.5 clock cycles, for slave the output valid time is 2.5 clock cycles. So if FlexIO SPI master communicates with other spi IPs, the maximum baud rate is FlexIO clock frequency divided by 2*2=4. If FlexIO SPI master communicates with FlexIO SPI slave, the maximum baud rate is FlexIO clock frequency divided by (1.5+2.5)*2=8.

Example

FLEXIO_SPI_Type spiDev = {
.flexioBase = FLEXIO,
.SDOPinIndex = 0,
.SDIPinIndex = 1,
.SCKPinIndex = 2,
.CSnPinIndex = 3,
.shifterIndex = {0,1},
.timerIndex = {0,1}
};
flexio_spi_master_config_t config = {
.enableMaster = true,
.enableInDoze = false,
.enableInDebug = true,
.enableFastAccess = false,
.baudRate_Bps = 500000,
.phase = kFLEXIO_SPI_ClockPhaseFirstEdge,
.direction = kFLEXIO_SPI_MsbFirst,
.dataMode = kFLEXIO_SPI_8BitMode
};
FLEXIO_SPI_MasterInit(&spiDev, &config, srcClock_Hz);

Parameters

base	Pointer to the FLEXIO_SPI_Type structure.
masterConfig	Pointer to the flexio_spi_master_config_t structure.
srcClock_Hz	FlexIO source clock in Hz.

void FLEXIO_SPI_MasterDeinit ( FLEXIO_SPI_Type * base )

Parameters

base	Pointer to the FLEXIO_SPI_Type.

void FLEXIO_SPI_MasterGetDefaultConfig ( flexio_spi_master_config_t * masterConfig )

The configuration can be used directly by calling the FLEXIO_SPI_MasterConfigure(). Example:

flexio_spi_master_config_t masterConfig;

FLEXIO_SPI_MasterGetDefaultConfig(&masterConfig);

Parameters

masterConfig Pointer to the flexio_spi_master_config_t structure.

void FLEXIO_SPI_SlaveInit	(	FLEXIO_SPI_Type *	base,
		flexio_spi_slave_config_t *	slaveConfig
	)

The configuration structure can be filled by the user, or be set with default values by the FLEXIO_SPI_SlaveGetDefaultConfig().

Note: 1.Only one timer is needed in the FlexIO SPI slave. As a result, the second timer index is ignored. 2.FlexIO SPI slave only support CPOL = 0, which means clock inactive low. 3.For FlexIO SPI master, the input valid time is 1.5 clock cycles, for slave the output valid time is 2.5 clock cycles. So if FlexIO SPI slave communicates with other spi IPs, the maximum baud rate is FlexIO clock frequency divided by 3*2=6. If FlexIO SPI slave communicates with FlexIO SPI master, the maximum baud rate is FlexIO clock frequency divided by (1.5+2.5)*2=8. Example
FLEXIO_SPI_Type spiDev = {

.flexioBase = FLEXIO,

.SDOPinIndex = 0,

.SDIPinIndex = 1,

.SCKPinIndex = 2,

.CSnPinIndex = 3,

.shifterIndex = {0,1},

.timerIndex = {0}

};

flexio_spi_slave_config_t config = {

.enableSlave = true,

.enableInDoze = false,

.enableInDebug = true,

.enableFastAccess = false,

.phase = kFLEXIO_SPI_ClockPhaseFirstEdge,

.direction = kFLEXIO_SPI_MsbFirst,

.dataMode = kFLEXIO_SPI_8BitMode

};

FLEXIO_SPI_SlaveInit(&spiDev, &config);

Parameters

base	Pointer to the FLEXIO_SPI_Type structure.
slaveConfig	Pointer to the flexio_spi_slave_config_t structure.

void FLEXIO_SPI_SlaveDeinit ( FLEXIO_SPI_Type * base )

Parameters

base	Pointer to the FLEXIO_SPI_Type.

void FLEXIO_SPI_SlaveGetDefaultConfig ( flexio_spi_slave_config_t * slaveConfig )

The configuration can be used directly for calling the FLEXIO_SPI_SlaveConfigure(). Example:

flexio_spi_slave_config_t slaveConfig;

FLEXIO_SPI_SlaveGetDefaultConfig(&slaveConfig);

Parameters

slaveConfig Pointer to the flexio_spi_slave_config_t structure.

uint32_t FLEXIO_SPI_GetStatusFlags ( FLEXIO_SPI_Type * base )

Parameters

base	Pointer to the FLEXIO_SPI_Type structure.

Returns

status flag; Use the status flag to AND the following flag mask and get the status.

kFLEXIO_SPI_TxEmptyFlag
kFLEXIO_SPI_RxEmptyFlag

void FLEXIO_SPI_ClearStatusFlags	(	FLEXIO_SPI_Type *	base,
		uint32_t	mask
	)

Parameters

base	Pointer to the FLEXIO_SPI_Type structure.
mask	status flag The parameter can be any combination of the following values: kFLEXIO_SPI_TxEmptyFlag kFLEXIO_SPI_RxEmptyFlag

void FLEXIO_SPI_EnableInterrupts	(	FLEXIO_SPI_Type *	base,
		uint32_t	mask
	)

This function enables the FlexIO SPI interrupt.

Parameters

base	Pointer to the FLEXIO_SPI_Type structure.
mask	interrupt source. The parameter can be any combination of the following values: kFLEXIO_SPI_RxFullInterruptEnable kFLEXIO_SPI_TxEmptyInterruptEnable

void FLEXIO_SPI_DisableInterrupts	(	FLEXIO_SPI_Type *	base,
		uint32_t	mask
	)

This function disables the FlexIO SPI interrupt.

Parameters

base	Pointer to the FLEXIO_SPI_Type structure.
mask	interrupt source The parameter can be any combination of the following values: kFLEXIO_SPI_RxFullInterruptEnable kFLEXIO_SPI_TxEmptyInterruptEnable

void FLEXIO_SPI_EnableDMA	(	FLEXIO_SPI_Type *	base,
		uint32_t	mask,
		bool	enable
	)

This function enables/disables the FlexIO SPI Tx DMA, which means that asserting the kFLEXIO_SPI_TxEmptyFlag does/doesn't trigger the DMA request.

Parameters

base	Pointer to the FLEXIO_SPI_Type structure.
mask	SPI DMA source.
enable	True means enable DMA, false means disable DMA.

static uint32_t FLEXIO_SPI_GetTxDataRegisterAddress	(	FLEXIO_SPI_Type *	base,
		flexio_spi_shift_direction_t	direction
	)

inlinestatic

This function returns the SPI data register address, which is mainly used by DMA/eDMA.

Parameters

base	Pointer to the FLEXIO_SPI_Type structure.
direction	Shift direction of MSB first or LSB first.

Returns: FlexIO SPI transmit data register address.

static uint32_t FLEXIO_SPI_GetRxDataRegisterAddress	(	FLEXIO_SPI_Type *	base,
		flexio_spi_shift_direction_t	direction
	)

inlinestatic

This function returns the SPI data register address, which is mainly used by DMA/eDMA.

Parameters

base	Pointer to the FLEXIO_SPI_Type structure.
direction	Shift direction of MSB first or LSB first.

Returns: FlexIO SPI receive data register address.

static void FLEXIO_SPI_Enable	(	FLEXIO_SPI_Type *	base,
		bool	enable
	)

inlinestatic

Parameters

base	Pointer to the FLEXIO_SPI_Type.
enable	True to enable, false does not have any effect.

void FLEXIO_SPI_MasterSetBaudRate	(	FLEXIO_SPI_Type *	base,
		uint32_t	baudRate_Bps,
		uint32_t	srcClockHz
	)

Parameters

base	Pointer to the FLEXIO_SPI_Type structure.
baudRate_Bps	Baud Rate needed in Hz.
srcClockHz	SPI source clock frequency in Hz.

static void FLEXIO_SPI_WriteData	(	FLEXIO_SPI_Type *	base,
		flexio_spi_shift_direction_t	direction,
		uint16_t	data
	)

inlinestatic

Note: This is a non-blocking API, which returns directly after the data is put into the data register but the data transfer is not finished on the bus. Ensure that the TxEmptyFlag is asserted before calling this API.

Parameters

base	Pointer to the FLEXIO_SPI_Type structure.
direction	Shift direction of MSB first or LSB first.
data	8 bit/16 bit data.

static uint16_t FLEXIO_SPI_ReadData	(	FLEXIO_SPI_Type *	base,
		flexio_spi_shift_direction_t	direction
	)

inlinestatic

Note: This is a non-blocking API, which returns directly after the data is read from the data register. Ensure that the RxFullFlag is asserted before calling this API.

Parameters

base	Pointer to the FLEXIO_SPI_Type structure.
direction	Shift direction of MSB first or LSB first.

Returns: 8 bit/16 bit data received.

status_t FLEXIO_SPI_WriteBlocking	(	FLEXIO_SPI_Type *	base,
		flexio_spi_shift_direction_t	direction,
		const uint8_t *	buffer,
		size_t	size
	)

Note: This function blocks using the polling method until all bytes have been sent.

Parameters

base	Pointer to the FLEXIO_SPI_Type structure.
direction	Shift direction of MSB first or LSB first.
buffer	The data bytes to send.
size	The number of data bytes to send.

Return values

kStatus_Success	Successfully create the handle.
kStatus_FLEXIO_SPI_Timeout	The transfer timed out and was aborted.

status_t FLEXIO_SPI_ReadBlocking	(	FLEXIO_SPI_Type *	base,
		flexio_spi_shift_direction_t	direction,
		uint8_t *	buffer,
		size_t	size
	)

Note: This function blocks using the polling method until all bytes have been received.

Parameters

base	Pointer to the FLEXIO_SPI_Type structure.
direction	Shift direction of MSB first or LSB first.
buffer	The buffer to store the received bytes.
size	The number of data bytes to be received.
direction	Shift direction of MSB first or LSB first.

Return values

kStatus_Success	Successfully create the handle.
kStatus_FLEXIO_SPI_Timeout	The transfer timed out and was aborted.

status_t FLEXIO_SPI_MasterTransferBlocking	(	FLEXIO_SPI_Type *	base,
		flexio_spi_transfer_t *	xfer
	)

Note: This function blocks via polling until all bytes have been received.

Parameters

base	pointer to FLEXIO_SPI_Type structure
xfer	FlexIO SPI transfer structure, see flexio_spi_transfer_t.

Return values

kStatus_Success	Successfully create the handle.
kStatus_FLEXIO_SPI_Timeout	The transfer timed out and was aborted.

status_t FLEXIO_SPI_MasterTransferCreateHandle	(	FLEXIO_SPI_Type *	base,
		flexio_spi_master_handle_t *	handle,
		flexio_spi_master_transfer_callback_t	callback,
		void *	userData
	)

Parameters

base	Pointer to the FLEXIO_SPI_Type structure.
handle	Pointer to the flexio_spi_master_handle_t structure to store the transfer state.
callback	The callback function.
userData	The parameter of the callback function.

Return values

kStatus_Success	Successfully create the handle.
kStatus_OutOfRange	The FlexIO type/handle/ISR table out of range.

status_t FLEXIO_SPI_MasterTransferNonBlocking	(	FLEXIO_SPI_Type *	base,
		flexio_spi_master_handle_t *	handle,
		flexio_spi_transfer_t *	xfer
	)

This function sends data using IRQ. This is a non-blocking function, which returns right away. When all data is sent out/received, the callback function is called.

Parameters

base	Pointer to the FLEXIO_SPI_Type structure.
handle	Pointer to the flexio_spi_master_handle_t structure to store the transfer state.
xfer	FlexIO SPI transfer structure. See flexio_spi_transfer_t.

Return values

kStatus_Success	Successfully start a transfer.
kStatus_InvalidArgument	Input argument is invalid.
kStatus_FLEXIO_SPI_Busy	SPI is not idle, is running another transfer.

void FLEXIO_SPI_MasterTransferAbort	(	FLEXIO_SPI_Type *	base,
		flexio_spi_master_handle_t *	handle
	)

Parameters

base	Pointer to the FLEXIO_SPI_Type structure.
handle	Pointer to the flexio_spi_master_handle_t structure to store the transfer state.

status_t FLEXIO_SPI_MasterTransferGetCount	(	FLEXIO_SPI_Type *	base,
		flexio_spi_master_handle_t *	handle,
		size_t *	count
	)

Parameters

base	Pointer to the FLEXIO_SPI_Type structure.
handle	Pointer to the flexio_spi_master_handle_t structure to store the transfer state.
count	Number of bytes transferred so far by the non-blocking transaction.

Return values

kStatus_InvalidArgument	count is Invalid.
kStatus_Success	Successfully return the count.

void FLEXIO_SPI_MasterTransferHandleIRQ	(	void *	spiType,
		void *	spiHandle
	)

Parameters

spiType	Pointer to the FLEXIO_SPI_Type structure.
spiHandle	Pointer to the flexio_spi_master_handle_t structure to store the transfer state.

status_t FLEXIO_SPI_SlaveTransferCreateHandle	(	FLEXIO_SPI_Type *	base,
		flexio_spi_slave_handle_t *	handle,
		flexio_spi_slave_transfer_callback_t	callback,
		void *	userData
	)

Parameters

base	Pointer to the FLEXIO_SPI_Type structure.
handle	Pointer to the flexio_spi_slave_handle_t structure to store the transfer state.
callback	The callback function.
userData	The parameter of the callback function.

Return values

kStatus_Success	Successfully create the handle.
kStatus_OutOfRange	The FlexIO type/handle/ISR table out of range.

status_t FLEXIO_SPI_SlaveTransferNonBlocking	(	FLEXIO_SPI_Type *	base,
		flexio_spi_slave_handle_t *	handle,
		flexio_spi_transfer_t *	xfer
	)

This function sends data using IRQ. This is a non-blocking function, which returns right away. When all data is sent out/received, the callback function is called.

Parameters

handle	Pointer to the flexio_spi_slave_handle_t structure to store the transfer state.
base	Pointer to the FLEXIO_SPI_Type structure.
xfer	FlexIO SPI transfer structure. See flexio_spi_transfer_t.

Return values

kStatus_Success	Successfully start a transfer.
kStatus_InvalidArgument	Input argument is invalid.
kStatus_FLEXIO_SPI_Busy	SPI is not idle; it is running another transfer.

static void FLEXIO_SPI_SlaveTransferAbort	(	FLEXIO_SPI_Type *	base,
		flexio_spi_slave_handle_t *	handle
	)

inlinestatic

Parameters

base	Pointer to the FLEXIO_SPI_Type structure.
handle	Pointer to the flexio_spi_slave_handle_t structure to store the transfer state.

static status_t FLEXIO_SPI_SlaveTransferGetCount	(	FLEXIO_SPI_Type *	base,
		flexio_spi_slave_handle_t *	handle,
		size_t *	count
	)

inlinestatic

Parameters

base	Pointer to the FLEXIO_SPI_Type structure.
handle	Pointer to the flexio_spi_slave_handle_t structure to store the transfer state.
count	Number of bytes transferred so far by the non-blocking transaction.

Return values

kStatus_InvalidArgument	count is Invalid.
kStatus_Success	Successfully return the count.

void FLEXIO_SPI_SlaveTransferHandleIRQ	(	void *	spiType,
		void *	spiHandle
	)

Parameters

spiType	Pointer to the FLEXIO_SPI_Type structure.
spiHandle	Pointer to the flexio_spi_slave_handle_t structure to store the transfer state.

Overview

Typical use case

FlexIO SPI send/receive using an interrupt method

FlexIO_SPI Send/Receive in DMA way

Data Structures

Macros

Typedefs

Enumerations

Driver version

FlexIO SPI Configuration

Status

Interrupts

DMA Control

Bus Operations

Transactional

Data Structure Documentation

Data Fields

Field Documentation

Data Fields

Field Documentation

Data Fields

Field Documentation

Data Fields

Field Documentation

Data Fields

Field Documentation

Macro Definition Documentation

Typedef Documentation

Enumeration Type Documentation

Function Documentation