Changing LCD panel resolution

Rainier Lamers

basing my design on the SHARP-lq0431dg01.c driver from the AM3517-evm. This has 480x270 pixels.

I need to drive a 800x480 pixel display. I modified the SHARP driver for the resolution and timings and the display works fine, however there seems to be something wrong with the frame buffer.

Images created by ts_calibrate appear to be intended for a 1024x768 display, same for the Ti startup screen (with the progress bar) so the image appears low and to the right. I added a 800x480 entry to the modedb.c and even fb.modes file, tried omapfb.mode on the kernel command line - no change.

Note that ts_calibrate reports correct resolution. fbset -i also reports correct resolution (but all timings show as 0).

Is there anything else that needs to be modified or set to get the correct frame buffer logical/virtual resolution ?

Rainier

over 12 years ago

0 Miroslav Kiradzhiyski XID over 12 years ago

TI__Mastermind 25235 points

Hi Rainier,

Please read the following: http://processors.wiki.ti.com/index.php/How_to_Recalibrate_the_Touchscreen

The pointercal file also has the resolution size inside it. Try deleting it before using ts_calibrate.

Best regards,
Miroslav

0 Rainier Lamers over 12 years ago in reply to Miroslav Kiradzhiyski XID

Prodigy 220 points

Pointercal file is not present.

Problem is also seen running Matrix. Icons appear to be formatted for a 1024x768 screen despite fbset -i reporting 800x480 for both resolution and virtual resolution.

Rainier

0 Miroslav Kiradzhiyski XID over 12 years ago in reply to Rainier Lamers

TI__Mastermind 25235 points

Hi Rainier,

Please check the Linux forum for a solution. I believe this is a configuration issue, but I'm not exactly sure what you are missing. The guys over the Linux forum should be able to help you.

Best regards,
Miroslav

Processors

Processors forum

Changing LCD panel resolution