FlexIO eDMA Camera Driver

Overview

Data Structures
struct	flexio_camera_edma_handle_t
	Camera eDMA handle. More...

Typedefs
typedef void(*	flexio_camera_edma_transfer_callback_t )(FLEXIO_CAMERA_Type *base, flexio_camera_edma_handle_t *handle, status_t status, void *userData)
	Camera transfer callback function. More...

eDMA transactional
status_t	FLEXIO_CAMERA_TransferCreateHandleEDMA (FLEXIO_CAMERA_Type *base, flexio_camera_edma_handle_t *handle, flexio_camera_edma_transfer_callback_t callback, void *userData, edma_handle_t *rxEdmaHandle)
	Initializes the Camera handle, which is used in transactional functions. More...
status_t	FLEXIO_CAMERA_TransferReceiveEDMA (FLEXIO_CAMERA_Type *base, flexio_camera_edma_handle_t *handle, flexio_camera_transfer_t *xfer)
	Receives data using eDMA. More...
void	FLEXIO_CAMERA_TransferAbortReceiveEDMA (FLEXIO_CAMERA_Type *base, flexio_camera_edma_handle_t *handle)
	Aborts the receive data which used the eDMA. More...
status_t	FLEXIO_CAMERA_TransferGetReceiveCountEDMA (FLEXIO_CAMERA_Type *base, flexio_camera_edma_handle_t *handle, size_t *count)
	Gets the remaining bytes to be received. More...

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Data Structure Documentation

struct _flexio_camera_edma_handle

Forward declaration of the handle typedef.

Data Fields
flexio_camera_edma_transfer_callback_t	callback
	Callback function. More...
void *	userData
	Camera callback function parameter. More...
size_t	rxSize
	Total bytes to be received. More...
edma_handle_t *	rxEdmaHandle
	The eDMA RX channel used. More...
uint8_t	nbytes
	eDMA minor byte transfer count initially configured. More...
volatile uint8_t	rxState
	RX transfer state.

Field Documentation

flexio_camera_edma_transfer_callback_t flexio_camera_edma_handle_t::callback

void* flexio_camera_edma_handle_t::userData

size_t flexio_camera_edma_handle_t::rxSize

edma_handle_t* flexio_camera_edma_handle_t::rxEdmaHandle

uint8_t flexio_camera_edma_handle_t::nbytes

Typedef Documentation

typedef void(* flexio_camera_edma_transfer_callback_t)(FLEXIO_CAMERA_Type *base, flexio_camera_edma_handle_t *handle, status_t status, void *userData)

Function Documentation

status_t FLEXIO_CAMERA_TransferCreateHandleEDMA	(	FLEXIO_CAMERA_Type *	base,
		flexio_camera_edma_handle_t *	handle,
		flexio_camera_edma_transfer_callback_t	callback,
		void *	userData,
		edma_handle_t *	rxEdmaHandle
	)

Parameters

base	Pointer to the FLEXIO_CAMERA_Type.
handle	Pointer to flexio_camera_edma_handle_t structure.
callback	The callback function.
userData	The parameter of the callback function.
rxEdmaHandle	User requested DMA handle for RX DMA transfer.

Return values

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

status_t FLEXIO_CAMERA_TransferReceiveEDMA	(	FLEXIO_CAMERA_Type *	base,
		flexio_camera_edma_handle_t *	handle,
		flexio_camera_transfer_t *	xfer
	)

This function receives data using eDMA. This is a non-blocking function, which returns right away. When all data is received, the receive callback function is called.

Parameters

base	Pointer to the FLEXIO_CAMERA_Type.
handle	Pointer to the flexio_camera_edma_handle_t structure.
xfer	Camera eDMA transfer structure, see flexio_camera_transfer_t.

Return values

kStatus_Success	if succeeded, others failed.
kStatus_CAMERA_RxBusy	Previous transfer on going.

void FLEXIO_CAMERA_TransferAbortReceiveEDMA	(	FLEXIO_CAMERA_Type *	base,
		flexio_camera_edma_handle_t *	handle
	)

This function aborts the receive data which used the eDMA.

Parameters

base	Pointer to the FLEXIO_CAMERA_Type.
handle	Pointer to the flexio_camera_edma_handle_t structure.

status_t FLEXIO_CAMERA_TransferGetReceiveCountEDMA	(	FLEXIO_CAMERA_Type *	base,
		flexio_camera_edma_handle_t *	handle,
		size_t *	count
	)

This function gets the number of bytes still not received.

Parameters

base	Pointer to the FLEXIO_CAMERA_Type.
handle	Pointer to the flexio_camera_edma_handle_t structure.
count	Number of bytes sent so far by the non-blocking transaction.

Return values

kStatus_Success	Succeed get the transfer count.
kStatus_InvalidArgument	The count parameter is invalid.