MityDSP::tcDspQvga16 Class Reference

The tcDspQvga16 class provides access to a 16-bit color QVGA (320x240 pixel) display device. More...

#include <core/DspQvga16.h>

Inheritance diagram for MityDSP::tcDspQvga16:

Public Member Functions
	tcDspQvga16 (void apAddress, tcDspFpgaDma apDma, int anDmaChannel, bool abPortrait=false)
	This constructor is used to open a tcDspQvga16 16-bit Quarter VGA display interface.
virtual	~tcDspQvga16 ()
	Default destructor.
virtual bool	SetFrameBuffer (void *apBuffer)
	Updates the current frame buffer, and initiates DMA transfer from the provided buffer.
virtual void	SetBacklight (float anPercent)
	This method sets the QVGA backlighting to the specified level.
virtual float	GetBacklight (void)
	This method retrieves the current QVGA backlighting level.
virtual bool	FlipDisplay (bool abFlip)
	This method is used to flip (or un-flip) the QVGA display presentation.
virtual bool	IsFlipped (void)
	This method indicates whether or not the display is currently flipped.
Protected Attributes
volatile unsigned int *	mpBaseAddr
	TouchScreen base address.
float	mnBacklightDutyPercent
	Current backlight duty cycle (percent).
unsigned int	mnBacklightDutyCounts
	Current backlight duty cycle (counts).
bool	mbDisplayFlipped
	True if display is flipped.
Static Protected Attributes
static const int	gnBacklightMinValue = 0
	minimum backlight duty cycle value
static const int	gnBacklightMaxValue = 256
	maximum backlight duty cycle value
static const int	gnStartStopDelayMsec = 200
	startup/shutdown delay (msec)
static unsigned int	mnTicksPerMsec = CLK_countspms() / CLK_getprd()
	Number of clocks per millisecond.

Detailed Description

The tcDspQvga16 class provides access to a 16-bit color QVGA (320x240 pixel) display device.

It is derived from the tcDspDisplayDriver base class to provide a consistent interface to the underlying frame buffer. Additional functions to set and get the display backlighting are provided. An instance of the tcDspFpgaDma class must be provided to exchange data with the device. This driver in turn may be used to setup direct access to the device's frame buffer, or may be used in conjunction with the tcDisplay class.

See also:: tcDspQvga16 Page

Constructor & Destructor Documentation

tcDspQvga16::tcDspQvga16	(	void *	apAddress,
		tcDspFpgaDma *	apDma,
		int	anDmaChannel,
		bool	abPortrait = `false`
	)

This constructor is used to open a tcDspQvga16 16-bit Quarter VGA display interface.

This constructor registers the required FPGA DMA interface with the base class.

Parameters:

`[in]`	apAddress	Base Address of the 16-bit QVGA core
`[in]`	apDma	Pointer to an instance of tcDspFpgaDma to use to provide access to the frame buffer.
`[in]`	anDmaChannel	The DMA channel in apDma to use.
`[in]`	abPortrait	True if the display is scanned in portrait mode, false if in landscape (default: false).

Returns:: None.

See also:: DspQvga16.h; DspDisplayDriver.h

tcDspQvga16::~tcDspQvga16 ( ) [virtual]

Default destructor.

Returns:: None.

Member Function Documentation

bool tcDspQvga16::SetFrameBuffer ( void * apBuffer ) [virtual]

Updates the current frame buffer, and initiates DMA transfer from the provided buffer.

If NULL, DMA is disabled. In addition, if the frame buffer is transitioning from NULL, the LCD startup procedure is performed. Similarly, if transitioning to NULL, the shutdown procedure is performed.

Parameters:

[in] apBuffer Pointer to the new frame buffer.