Overview

Files
file	fsl_sai_dma.h

Data Structures
struct	sai_dma_handle_t
	SAI DMA transfer handle, users should not touch the content of the handle. More...

Typedefs
typedef void(*	sai_dma_callback_t )(I2S_Type base, sai_dma_handle_t handle, status_t status, void *userData)
	Define SAI DMA callback.

DMA Transactional
void	SAI_TransferTxCreateHandleDMA (I2S_Type base, sai_dma_handle_t handle, sai_dma_callback_t callback, void userData, dma_handle_t dmaHandle)
	Initializes the SAI master DMA handle. More...

void	SAI_TransferRxCreateHandleDMA (I2S_Type base, sai_dma_handle_t handle, sai_dma_callback_t callback, void userData, dma_handle_t dmaHandle)
	Initializes the SAI slave DMA handle. More...

void	SAI_TransferTxSetFormatDMA (I2S_Type base, sai_dma_handle_t handle, sai_transfer_format_t *format, uint32_t mclkSourceClockHz, uint32_t bclkSourceClockHz)
	Configures the SAI Tx audio format. More...

void	SAI_TransferRxSetFormatDMA (I2S_Type base, sai_dma_handle_t handle, sai_transfer_format_t *format, uint32_t mclkSourceClockHz, uint32_t bclkSourceClockHz)
	Configures the SAI Rx audio format. More...

status_t	SAI_TransferSendDMA (I2S_Type base, sai_dma_handle_t handle, sai_transfer_t *xfer)
	Performs a non-blocking SAI transfer using DMA. More...

status_t	SAI_TransferReceiveDMA (I2S_Type base, sai_dma_handle_t handle, sai_transfer_t *xfer)
	Performs a non-blocking SAI transfer using DMA. More...

void	SAI_TransferAbortSendDMA (I2S_Type base, sai_dma_handle_t handle)
	Aborts a SAI transfer using DMA. More...

void	SAI_TransferAbortReceiveDMA (I2S_Type base, sai_dma_handle_t handle)
	Aborts a SAI transfer using DMA. More...

status_t	SAI_TransferGetSendCountDMA (I2S_Type base, sai_dma_handle_t handle, size_t *count)
	Gets byte count sent by SAI. More...

status_t	SAI_TransferGetReceiveCountDMA (I2S_Type base, sai_dma_handle_t handle, size_t *count)
	Gets byte count received by SAI. More...

Data Structure Documentation

struct _sai_dma_handle

Data Fields
dma_handle_t *	dmaHandle
	DMA handler for SAI send.

uint8_t	bytesPerFrame
	Bytes in a frame.

uint8_t	channel
	Which Data channel SAI use.

uint32_t	state
	SAI DMA transfer internal state.

sai_dma_callback_t	callback
	Callback for users while transfer finish or error occured.

void *	userData
	User callback parameter.

sai_transfer_t	saiQueue [SAI_XFER_QUEUE_SIZE]
	Transfer queue storing queued transfer. More...

size_t	transferSize [SAI_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

sai_transfer_t sai_dma_handle_t::saiQueue[SAI_XFER_QUEUE_SIZE]

volatile uint8_t sai_dma_handle_t::queueUser

Function Documentation

void SAI_TransferTxCreateHandleDMA	(	I2S_Type *	base,
		sai_dma_handle_t *	handle,
		sai_dma_callback_t	callback,
		void *	userData,
		dma_handle_t *	dmaHandle
	)

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

Parameters

base	SAI base pointer.
handle	SAI DMA handle pointer.
base	SAI peripheral base address.
callback	Pointer to user callback function.
userData	User parameter passed to the callback function.
dmaHandle	DMA handle pointer, this handle shall be static allocated by users.

void SAI_TransferRxCreateHandleDMA	(	I2S_Type *	base,
		sai_dma_handle_t *	handle,
		sai_dma_callback_t	callback,
		void *	userData,
		dma_handle_t *	dmaHandle
	)

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

Parameters

base	SAI base pointer.
handle	SAI DMA handle pointer.
base	SAI peripheral base address.
callback	Pointer to user callback function.
userData	User parameter passed to the callback function.
dmaHandle	DMA handle pointer, this handle shall be static allocated by users.

void SAI_TransferTxSetFormatDMA	(	I2S_Type *	base,
		sai_dma_handle_t *	handle,
		sai_transfer_format_t *	format,
		uint32_t	mclkSourceClockHz,
		uint32_t	bclkSourceClockHz
	)

The audio format can be changed at run-time. This function configures the sample rate and audio data format to be transferred. This function also sets the eDMA parameter according to the format.

Parameters

base	SAI base pointer.
handle	SAI DMA handle pointer.
format	Pointer to SAI audio data format structure.
mclkSourceClockHz	SAI master clock source frequency in Hz.
bclkSourceClockHz	SAI bit clock source frequency in Hz. If bit clock source is master. clock, this value should equals to masterClockHz in format.

Return values

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

void SAI_TransferRxSetFormatDMA	(	I2S_Type *	base,
		sai_dma_handle_t *	handle,
		sai_transfer_format_t *	format,
		uint32_t	mclkSourceClockHz,
		uint32_t	bclkSourceClockHz
	)

The audio format can be changed at run-time. This function configures the sample rate and audio data format to be transferred. This function also sets EDMA parameter according to format.

Parameters

base	SAI base pointer.
handle	SAI DMA handle pointer.
format	Pointer to SAI audio data format structure.
mclkSourceClockHz	SAI master clock source frequency in Hz.
bclkSourceClockHz	SAI bit clock source frequency in Hz. If bit clock source is master. clock, this value should equals to masterClockHz in format.

Return values

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

status_t SAI_TransferSendDMA	(	I2S_Type *	base,
		sai_dma_handle_t *	handle,
		sai_transfer_t *	xfer
	)

Note: This interface returns immediately after the transfer initiates. Call the SAI_GetTransferStatus to poll the transfer status to check whether the SAI transfer finished.

Parameters

base	SAI base pointer.
handle	SAI DMA handle pointer.
xfer	Pointer to DMA transfer structure.

Return values

kStatus_Success	Successfully start the data receive.
kStatus_SAI_TxBusy	Previous receive still not finished.
kStatus_InvalidArgument	The input parameter is invalid.

status_t SAI_TransferReceiveDMA	(	I2S_Type *	base,
		sai_dma_handle_t *	handle,
		sai_transfer_t *	xfer
	)

Note: This interface returns immediately after transfer initiates. Call SAI_GetTransferStatus to poll the transfer status to check whether the SAI transfer is finished.

Parameters

base	SAI base pointer
handle	SAI DMA handle pointer.
xfer	Pointer to DMA transfer structure.

Return values

kStatus_Success	Successfully start the data receive.
kStatus_SAI_RxBusy	Previous receive still not finished.
kStatus_InvalidArgument	The input parameter is invalid.

void SAI_TransferAbortSendDMA	(	I2S_Type *	base,
		sai_dma_handle_t *	handle
	)

Parameters

base	SAI base pointer.
handle	SAI DMA handle pointer.

void SAI_TransferAbortReceiveDMA	(	I2S_Type *	base,
		sai_dma_handle_t *	handle
	)

Parameters

base	SAI base pointer.
handle	SAI DMA handle pointer.

status_t SAI_TransferGetSendCountDMA	(	I2S_Type *	base,
		sai_dma_handle_t *	handle,
		size_t *	count
	)

Parameters

base	SAI base pointer.
handle	SAI DMA handle pointer.
count	Bytes count sent by SAI.

Return values

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

status_t SAI_TransferGetReceiveCountDMA	(	I2S_Type *	base,
		sai_dma_handle_t *	handle,
		size_t *	count
	)

Parameters

base	SAI base pointer.
handle	SAI DMA handle pointer.
count	Bytes count received by SAI.

Return values

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

Overview

Files

Data Structures

Typedefs

DMA Transactional

Data Structure Documentation

Data Fields

Field Documentation

Function Documentation