[U-Boot-Users] 16bit BPP color depth image on LCD

[U-Boot-Users] 16bit BPP color depth image on LCD

[Praveen VS]

Hello,

Our board is customised board based on PXA255 processor, in that we have
the samsung Color LCD Controller( S6B33B0A) . 

The LCD is not interfaced to the Default PXA255 LCD pins.
IN our board the LCD controller ChipsSelect is connected to the Static
Chipselect 4 of PXA255 The LCD is a 16bpp LCD.

We are able to initialise the LCD. We are able to get the plain colors
sucessfully. We are trying to display u-boot logo on this  16bpp LCD.But
it is not displaying..

When we looked at code bmp_logo.c , we found utility called bmp_logo, 
which converts bmp file into header
This header file is for 8 bpp & has a bmp palette field.
It tries to write the Pallette info on to Palette Ram of PXA255.

But our LCD controller is external & doesn't have pallette RAM.It only
has a standard DisplayRAM The 16 bit colors which this controller
supports doesn't have the Pallete information.

How can we display the logo of 16bpp color depth image onto the LCD.in
U-boot?

Thanks
Reagrds
Praveen

[U-Boot-Users] 16bit BPP color depth image on LCD

[Praveen VS]

Hello,

Our board is customised board based on PXA255 processor, 
in that we have the samsung Color LCD Controller( S6B33B0A) . 

The LCD is not interfaced to the Default PXA255 LCD pins.
IN our board the LCD controller ChipsSelect is connected to
 the Static Chipselect 4 of PXA255 The LCD is a 16bpp LCD.

We are able to initialise the LCD.
 We are able to get the plain colors sucessfully.
 We are trying to display u-boot logo on this  16bpp LCD.
But it is not displaying..

When we looked at code bmp_logo.c , we found utility called bmp_logo, 
which converts bmp file into header
This header file is for 8 bpp & has a bmp palette field.
It tries to write the Pallette info on to Palette Ram of PXA255.

But our LCD controller is external & doesn't have pallette RAM.
It only has a standard DisplayRAM .
The 16 bit colors which this controller supports doesn't have the
Pallete information.

How can we display the logo of 16bpp color depth image onto the LCD.in
U-boot?

Thanks
Reagrds
Praveen

[U-Boot-Users] 16bit BPP color depth image on LCD

[Andrew Dyer]

On Fri, 25 Feb 2005 11:23:00 +0530, Praveen VS <praveen@spacomp.com> wrote:
> Hello,
> 
> When we looked at code bmp_logo.c , we found utility called bmp_logo,
> which converts bmp file into header
> This header file is for 8 bpp & has a bmp palette field.
> It tries to write the Pallette info on to Palette Ram of PXA255.
> 

It sounds like you need to write a driver for your LCD controller chip...

If you look at the code which actually displays the image (don't have my
source tree handy right now) you'll see that it takes the palette data and
expands it out to the appropriate colors depending on the type of display
color setup you have.  We have it working fine on a 32 bpp display which
is 8-8-8 color, but the principle is the same for 5-6-5.


-- 
Hardware, n.:
        The parts of a computer system that can be kicked.

[U-Boot-Users] 16bit BPP color depth image on LCD

[Hinko Kocevar]

Praveen VS wrote:

> 
> We are able to initialise the LCD. We are able to get the plain colors
> sucessfully. We are trying to display u-boot logo on this  16bpp LCD.But
> it is not displaying..
> 

I have some patch laying around - it was submited to this list some time 
ago but I guess it didn't make it in... You are probably interested in 
just one function here - bitmap_plot().

If I recall correctly it was working for me, but right now I'm not in 
position to test it.

HTH,
hk


-- 
hinko <dot> kocevar <at> iskramedical <dot> si
Hinko Kocevar, embedded systems developer
Iskra Medical d.o.o., Stegne 23, 1k LJ, SLO-EU

	"A? r?n"	|	[Analects XII:22]
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