NoDMA

touchgfx/hal/NoDMA.hpp

This is an "empty" DMA subclass that does nothing except assert if accidentally used. An instance of this object can be used if DMA support is not desired.

See: DMA_Interface

Inherits from: DMA_Interface

Public Functions

virtual void	flush()
	Block until all DMA transfers are complete.
virtual BlitOperations	getBlitCaps()
	No blit operations supported by this DMA implementation.
	NoDMA()
virtual void	setupDataCopy(const BlitOp & blitOp)
	Asserts if used.
virtual void	setupDataFill(const BlitOp & blitOp)
	Asserts if used.
virtual void	signalDMAInterrupt()
	Does nothing.

Additional inherited members

Public Functions inherited from DMA_Interface

virtual void	addToQueue(const BlitOp & op)
	Inserts a BlitOp for processing.
bool	getAllowed() const
	Gets whether a DMA operation is allowed to begin.
virtual DMAType	getDMAType()
	Function for obtaining the DMA type of the concrete DMA_Interface implementation.
bool	getReserved() const
	Gets whether a DMA operation is reserved by rendering.
virtual void	initialize()
	Perform initialization.
uint8_t	isDmaQueueEmpty()
	Query if the DMA queue is empty.
uint8_t	isDmaQueueFull()
	Query if the DMA queue is full.
bool	isDMARunning()
	Query if the DMA is running.
void	setAllowed(bool allowed)
	Sets whether or not a DMA operation is allowed to begin.
void	setReserved(bool reserved)
	Sets whether or not a DMA operation is reserved by rendering.
virtual void	start()
	Signals that DMA transfers can start.
virtual	~DMA_Interface()
	Finalizes an instance of the DMA_Interface class.

Protected Functions inherited from DMA_Interface

virtual void	disableAlpha()
	Configures blit-op hardware for solid operation (no alpha-blending)
	DMA_Interface(DMA_Queue & dmaQueue)
	Constructs a DMA Interface object.
virtual void	enableAlpha(uint8_t alpha)
	Configures blit-op hardware for alpha-blending.
virtual void	enableCopyWithTransparentPixels(uint8_t alpha)
	Configures blit-op hardware for alpha-blending while simultaneously skipping transparent pixels.
virtual void	execute()
	Performs a queued blit-op.
virtual void	executeCompleted()
	To be called when blit-op has been performed.
virtual void	seedExecution()
	Called when elements are added to the DMA-queue.
virtual void	waitForFrameBufferSemaphore()
	Waits until framebuffer semaphore is available (i.e.

Protected Attributes inherited from DMA_Interface

bool	isAllowed
	true if DMA transfers are currently allowed.
bool	isReserved
	true if DMA is reserved for for HW rendering
bool	isRunning
	true if a DMA transfer is currently ongoing.
DMA_Queue &	queue
	Reference to the DMA queue.

Public Functions Documentation

flush

virtual void flush	(			)

Block until all DMA transfers are complete.

Since this particular DMA does not do anything, return immediately.

Reimplements: touchgfx::DMA_Interface::flush

getBlitCaps

virtual BlitOperations getBlitCaps	(			)

No blit operations supported by this DMA implementation.

Returns:

Zero (no blit ops supported).

Reimplements: touchgfx::DMA_Interface::getBlitCaps

NoDMA

NoDMA	(			)

setupDataCopy

virtual void setupDataCopy	(	const BlitOp &	blitOp	)

Asserts if used.

Parameters:

blitOp	The blit operation to be performed by this DMA instance.

Reimplements: touchgfx::DMA_Interface::setupDataCopy

setupDataFill

virtual void setupDataFill	(	const BlitOp &	blitOp	)

Asserts if used.

Parameters:

blitOp	The blit operation to be performed by this DMA instance.

Reimplements: touchgfx::DMA_Interface::setupDataFill

signalDMAInterrupt

virtual void signalDMAInterrupt	(			)

Does nothing.

Reimplements: touchgfx::DMA_Interface::signalDMAInterrupt