LPUART DMA Driver

Overview

Data Structures
struct	lpuart_dma_handle_t
	LPUART DMA handle. More...

Typedefs
typedef void(*	lpuart_dma_transfer_callback_t )(LPUART_Type *base, lpuart_dma_handle_t *handle, status_t status, void *userData)
	LPUART transfer callback function. More...

EDMA transactional
void	LPUART_TransferCreateHandleDMA (LPUART_Type *base, lpuart_dma_handle_t *handle, lpuart_dma_transfer_callback_t callback, void *userData, dma_handle_t *txDmaHandle, dma_handle_t *rxDmaHandle)
	Initializes the LPUART handle which is used in transactional functions. More...
status_t	LPUART_TransferSendDMA (LPUART_Type *base, lpuart_dma_handle_t *handle, lpuart_transfer_t *xfer)
	Sends data using DMA. More...
status_t	LPUART_TransferReceiveDMA (LPUART_Type *base, lpuart_dma_handle_t *handle, lpuart_transfer_t *xfer)
	Receives data using DMA. More...
void	LPUART_TransferAbortSendDMA (LPUART_Type *base, lpuart_dma_handle_t *handle)
	Aborts the sent data using DMA. More...
void	LPUART_TransferAbortReceiveDMA (LPUART_Type *base, lpuart_dma_handle_t *handle)
	Aborts the received data using DMA. More...
status_t	LPUART_TransferGetSendCountDMA (LPUART_Type *base, lpuart_dma_handle_t *handle, uint32_t *count)
	Gets the number of bytes written to the LPUART TX register. More...
status_t	LPUART_TransferGetReceiveCountDMA (LPUART_Type *base, lpuart_dma_handle_t *handle, uint32_t *count)
	Gets the number of received bytes. More...

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Data Structure Documentation

struct _lpuart_dma_handle

Data Fields
lpuart_dma_transfer_callback_t	callback
	Callback function. More...
void *	userData
	LPUART callback function parameter. More...
size_t	rxDataSizeAll
	Size of the data to receive. More...
size_t	txDataSizeAll
	Size of the data to send out. More...
dma_handle_t *	txDmaHandle
	The DMA TX channel used. More...
dma_handle_t *	rxDmaHandle
	The DMA RX channel used. More...
volatile uint8_t	txState
	TX transfer state. More...
volatile uint8_t	rxState
	RX transfer state.

Field Documentation

lpuart_dma_transfer_callback_t lpuart_dma_handle_t::callback

void* lpuart_dma_handle_t::userData

size_t lpuart_dma_handle_t::rxDataSizeAll

size_t lpuart_dma_handle_t::txDataSizeAll

dma_handle_t* lpuart_dma_handle_t::txDmaHandle

dma_handle_t* lpuart_dma_handle_t::rxDmaHandle

volatile uint8_t lpuart_dma_handle_t::txState

Typedef Documentation

typedef void(* lpuart_dma_transfer_callback_t)(LPUART_Type *base, lpuart_dma_handle_t *handle, status_t status, void *userData)

Function Documentation

void LPUART_TransferCreateHandleDMA	(	LPUART_Type *	base,
		lpuart_dma_handle_t *	handle,
		lpuart_dma_transfer_callback_t	callback,
		void *	userData,
		dma_handle_t *	txDmaHandle,
		dma_handle_t *	rxDmaHandle
	)

Parameters

base	LPUART peripheral base address.
handle	Pointer to lpuart_dma_handle_t structure.
callback	Callback function.
userData	User data.
txDmaHandle	User-requested DMA handle for TX DMA transfer.
rxDmaHandle	User-requested DMA handle for RX DMA transfer.

status_t LPUART_TransferSendDMA	(	LPUART_Type *	base,
		lpuart_dma_handle_t *	handle,
		lpuart_transfer_t *	xfer
	)

This function sends data using DMA. This is a non-blocking function, which returns right away. When all data is sent, the send callback function is called.

Parameters

base	LPUART peripheral base address.
handle	LPUART handle pointer.
xfer	LPUART DMA transfer structure. See lpuart_transfer_t.

Return values

kStatus_Success	if succeed, others failed.
kStatus_LPUART_TxBusy	Previous transfer on going.
kStatus_InvalidArgument	Invalid argument.

status_t LPUART_TransferReceiveDMA	(	LPUART_Type *	base,
		lpuart_dma_handle_t *	handle,
		lpuart_transfer_t *	xfer
	)

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

Parameters

base	LPUART peripheral base address.
handle	Pointer to lpuart_dma_handle_t structure.
xfer	LPUART DMA transfer structure. See lpuart_transfer_t.

Return values

kStatus_Success	if succeed, others failed.
kStatus_LPUART_RxBusy	Previous transfer on going.
kStatus_InvalidArgument	Invalid argument.

void LPUART_TransferAbortSendDMA	(	LPUART_Type *	base,
		lpuart_dma_handle_t *	handle
	)

This function aborts send data using DMA.

Parameters

base	LPUART peripheral base address
handle	Pointer to lpuart_dma_handle_t structure

void LPUART_TransferAbortReceiveDMA	(	LPUART_Type *	base,
		lpuart_dma_handle_t *	handle
	)

This function aborts the received data using DMA.

Parameters

base	LPUART peripheral base address
handle	Pointer to lpuart_dma_handle_t structure

status_t LPUART_TransferGetSendCountDMA	(	LPUART_Type *	base,
		lpuart_dma_handle_t *	handle,
		uint32_t *	count
	)

This function gets the number of bytes that have been written to LPUART TX register by DMA.

Parameters

base	LPUART peripheral base address.
handle	LPUART handle pointer.
count	Send bytes count.

Return values

kStatus_NoTransferInProgress	No send in progress.
kStatus_InvalidArgument	Parameter is invalid.
kStatus_Success	Get successfully through the parameter count;

status_t LPUART_TransferGetReceiveCountDMA	(	LPUART_Type *	base,
		lpuart_dma_handle_t *	handle,
		uint32_t *	count
	)

This function gets the number of received bytes.

Parameters

base	LPUART peripheral base address.
handle	LPUART handle pointer.
count	Receive bytes count.

Return values

kStatus_NoTransferInProgress	No receive in progress.
kStatus_InvalidArgument	Parameter is invalid.
kStatus_Success	Get successfully through the parameter count;