Drawing raw pixels to screen..

[jollen]

On Thu, 23 Nov 2006 12:45:26 -0500, Richard Franks wrote

> 
> Fundamental to this though, is how quickly the Neo1973 can update its
> display - is it possible to get some FPS figures for just a simple 
> for XY loop?

For FPS calucation, pluse and porch should first be determined. The typical
values for Samsung 2.83" TFT-LCD goes:

VSPW	1
VBPD	9

VFPD	2
HSPW	5
HBPD	19
HFPD	2

HCLK	133

And HCLK is 133 for s3c2410 with 266 MHz operation mode. Then, 240*320 is 38.8
MHZ in frame rate if 'MVAL' field of LCDCON4 register of s3c2410 is set to 18.

It's the MVAL that determines the resulting frame rate, for 480*640 with the
same pulse and porch values:

*IF* frame frame is suggested to be ABOUT 38.8MHz, then the MVAL should be set
to 4 therefore IN THIS CASE.

Tuning and patchof Linux fb machine-dependent driver should be considered.


--
Jollen Chen [Jollen at jollen dot org]
Website [zh-TW]: http://www.jollen.org
Blog [zh-TW]: http://www.jollen.org/blog/