FlexIO eDMA I2S Driver

Overview

Data Structures
struct	flexio_i2s_edma_handle_t
	FlexIO I2S DMA transfer handle, users should not touch the content of the handle. More...

Typedefs
typedef void(*	flexio_i2s_edma_callback_t )(FLEXIO_I2S_Type *base, flexio_i2s_edma_handle_t *handle, status_t status, void *userData)
	FlexIO I2S eDMA transfer callback function for finish and error.

eDMA Transactional
void	FLEXIO_I2S_TransferTxCreateHandleEDMA (FLEXIO_I2S_Type *base, flexio_i2s_edma_handle_t *handle, flexio_i2s_edma_callback_t callback, void *userData, edma_handle_t *dmaHandle)
	Initializes the FlexIO I2S eDMA handle. More...
void	FLEXIO_I2S_TransferRxCreateHandleEDMA (FLEXIO_I2S_Type *base, flexio_i2s_edma_handle_t *handle, flexio_i2s_edma_callback_t callback, void *userData, edma_handle_t *dmaHandle)
	Initializes the FlexIO I2S Rx eDMA handle. More...
void	FLEXIO_I2S_TransferSetFormatEDMA (FLEXIO_I2S_Type *base, flexio_i2s_edma_handle_t *handle, flexio_i2s_format_t *format, uint32_t srcClock_Hz)
	Configures the FlexIO I2S Tx audio format. More...
status_t	FLEXIO_I2S_TransferSendEDMA (FLEXIO_I2S_Type *base, flexio_i2s_edma_handle_t *handle, flexio_i2s_transfer_t *xfer)
	Performs a non-blocking FlexIO I2S transfer using DMA. More...
status_t	FLEXIO_I2S_TransferReceiveEDMA (FLEXIO_I2S_Type *base, flexio_i2s_edma_handle_t *handle, flexio_i2s_transfer_t *xfer)
	Performs a non-blocking FlexIO I2S receive using eDMA. More...
void	FLEXIO_I2S_TransferAbortSendEDMA (FLEXIO_I2S_Type *base, flexio_i2s_edma_handle_t *handle)
	Aborts a FlexIO I2S transfer using eDMA. More...
void	FLEXIO_I2S_TransferAbortReceiveEDMA (FLEXIO_I2S_Type *base, flexio_i2s_edma_handle_t *handle)
	Aborts a FlexIO I2S receive using eDMA. More...
status_t	FLEXIO_I2S_TransferGetSendCountEDMA (FLEXIO_I2S_Type *base, flexio_i2s_edma_handle_t *handle, size_t *count)
	Gets the remaining bytes to be sent. More...
status_t	FLEXIO_I2S_TransferGetReceiveCountEDMA (FLEXIO_I2S_Type *base, flexio_i2s_edma_handle_t *handle, size_t *count)
	Get the remaining bytes to be received. More...

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Data Structure Documentation

struct _flexio_i2s_edma_handle

Data Fields
edma_handle_t *	dmaHandle
	DMA handler for FlexIO I2S send.
uint8_t	bytesPerFrame
	Bytes in a frame.
uint8_t	nbytes
	eDMA minor byte transfer count initially configured. More...
uint32_t	state
	Internal state for FlexIO I2S eDMA transfer.
flexio_i2s_edma_callback_t	callback
	Callback for users while transfer finish or error occurred.
void *	userData
	User callback parameter.
edma_tcd_t	tcd [FLEXIO_I2S_XFER_QUEUE_SIZE+1U]
	TCD pool for eDMA transfer. More...
flexio_i2s_transfer_t	queue [FLEXIO_I2S_XFER_QUEUE_SIZE]
	Transfer queue storing queued transfer. More...
size_t	transferSize [FLEXIO_I2S_XFER_QUEUE_SIZE]
	Data bytes need to transfer.
volatile uint8_t	queueUser
	Index for user to queue transfer. More...
volatile uint8_t	queueDriver
	Index for driver to get the transfer data and size.

Field Documentation

uint8_t flexio_i2s_edma_handle_t::nbytes

edma_tcd_t flexio_i2s_edma_handle_t::tcd[FLEXIO_I2S_XFER_QUEUE_SIZE+1U]

flexio_i2s_transfer_t flexio_i2s_edma_handle_t::queue[FLEXIO_I2S_XFER_QUEUE_SIZE]

volatile uint8_t flexio_i2s_edma_handle_t::queueUser

Function Documentation

void FLEXIO_I2S_TransferTxCreateHandleEDMA	(	FLEXIO_I2S_Type *	base,
		flexio_i2s_edma_handle_t *	handle,
		flexio_i2s_edma_callback_t	callback,
		void *	userData,
		edma_handle_t *	dmaHandle
	)

This function initializes the FlexIO I2S master DMA handle which can be used for other FlexIO I2S master transactional APIs. Usually, for a specified FlexIO I2S instance, call this API once to get the initialized handle.

Parameters

base	FlexIO I2S peripheral base address.
handle	FlexIO I2S eDMA handle pointer.
callback	FlexIO I2S eDMA callback function called while finished a block.
userData	User parameter for callback.
dmaHandle	eDMA handle for FlexIO I2S. This handle is a static value allocated by users.

void FLEXIO_I2S_TransferRxCreateHandleEDMA	(	FLEXIO_I2S_Type *	base,
		flexio_i2s_edma_handle_t *	handle,
		flexio_i2s_edma_callback_t	callback,
		void *	userData,
		edma_handle_t *	dmaHandle
	)

This function initializes the FlexIO I2S slave DMA handle which can be used for other FlexIO I2S master transactional APIs. Usually, for a specified FlexIO I2S instance, call this API once to get the initialized handle.

Parameters

base	FlexIO I2S peripheral base address.
handle	FlexIO I2S eDMA handle pointer.
callback	FlexIO I2S eDMA callback function called while finished a block.
userData	User parameter for callback.
dmaHandle	eDMA handle for FlexIO I2S. This handle is a static value allocated by users.

void FLEXIO_I2S_TransferSetFormatEDMA	(	FLEXIO_I2S_Type *	base,
		flexio_i2s_edma_handle_t *	handle,
		flexio_i2s_format_t *	format,
		uint32_t	srcClock_Hz
	)

Audio format can be changed in run-time of FlexIO I2S. This function configures the sample rate and audio data format to be transferred. This function also sets the eDMA parameter according to format.

Parameters

base	FlexIO I2S peripheral base address.
handle	FlexIO I2S eDMA handle pointer
format	Pointer to FlexIO I2S audio data format structure.
srcClock_Hz	FlexIO I2S clock source frequency in Hz, it should be 0 while in slave mode.

Return values

kStatus_Success	Audio format set successfully.
kStatus_InvalidArgument	The input arguments is invalid.

status_t FLEXIO_I2S_TransferSendEDMA	(	FLEXIO_I2S_Type *	base,
		flexio_i2s_edma_handle_t *	handle,
		flexio_i2s_transfer_t *	xfer
	)

Note

This interface returned immediately after transfer initiates. Users should call FLEXIO_I2S_GetTransferStatus to poll the transfer status and check whether the FlexIO I2S transfer is finished.

Parameters

base	FlexIO I2S peripheral base address.
handle	FlexIO I2S DMA handle pointer.
xfer	Pointer to DMA transfer structure.

Return values

kStatus_Success	Start a FlexIO I2S eDMA send successfully.
kStatus_InvalidArgument	The input arguments is invalid.
kStatus_TxBusy	FlexIO I2S is busy sending data.

status_t FLEXIO_I2S_TransferReceiveEDMA	(	FLEXIO_I2S_Type *	base,
		flexio_i2s_edma_handle_t *	handle,
		flexio_i2s_transfer_t *	xfer
	)

Note

This interface returned immediately after transfer initiates. Users should call FLEXIO_I2S_GetReceiveRemainingBytes to poll the transfer status and check whether the FlexIO I2S transfer is finished.

Parameters

base	FlexIO I2S peripheral base address.
handle	FlexIO I2S DMA handle pointer.
xfer	Pointer to DMA transfer structure.

Return values

kStatus_Success	Start a FlexIO I2S eDMA receive successfully.
kStatus_InvalidArgument	The input arguments is invalid.
kStatus_RxBusy	FlexIO I2S is busy receiving data.

void FLEXIO_I2S_TransferAbortSendEDMA	(	FLEXIO_I2S_Type *	base,
		flexio_i2s_edma_handle_t *	handle
	)

Parameters

base	FlexIO I2S peripheral base address.
handle	FlexIO I2S DMA handle pointer.

void FLEXIO_I2S_TransferAbortReceiveEDMA	(	FLEXIO_I2S_Type *	base,
		flexio_i2s_edma_handle_t *	handle
	)

Parameters

base	FlexIO I2S peripheral base address.
handle	FlexIO I2S DMA handle pointer.

status_t FLEXIO_I2S_TransferGetSendCountEDMA	(	FLEXIO_I2S_Type *	base,
		flexio_i2s_edma_handle_t *	handle,
		size_t *	count
	)

Parameters

base	FlexIO I2S peripheral base address.
handle	FlexIO I2S DMA handle pointer.
count	Bytes sent.

Return values

kStatus_Success	Succeed get the transfer count.
kStatus_NoTransferInProgress	There is not a non-blocking transaction currently in progress.

status_t FLEXIO_I2S_TransferGetReceiveCountEDMA	(	FLEXIO_I2S_Type *	base,
		flexio_i2s_edma_handle_t *	handle,
		size_t *	count
	)

Parameters

base	FlexIO I2S peripheral base address.
handle	FlexIO I2S DMA handle pointer.
count	Bytes received.

Return values

kStatus_Success	Succeed get the transfer count.
kStatus_NoTransferInProgress	There is not a non-blocking transaction currently in progress.