dm8148 uboot splash logo issue

Liran Ritkop102360

Hi!

I am using a dm8148 processor with some kind of LCD. I managed to add the backlight and to display a bmp on the LCD at the uboot level. But, The image is flickering and i can't figure out what are the right configured times, as for now i use:

ti814x_vps_configure_venc(VPS_REG_BASE + 0xA000, 800, 816, 878, 938, 480, 489, 495, 525, 0, 1, 1);

The picture i get is flickering. You can see two shots taken from the image in the attached

Also, I attache a part from the data sheet of the LCD.

Can you help me with that issue?

over 12 years ago

0 Margarita Gashova over 12 years ago

TI__Guru* 80190 points

Hello,

What is the software release that you are using here?

Best Regards,

Margarita

0 Liran Ritkop102360 over 12 years ago in reply to Margarita Gashova

Intellectual 300 points

I am using EZSDK 5.04.00.11 with PSP 4.01.00.07 Uboot 4.04.00.01

0 Margarita Gashova over 12 years ago in reply to Liran Ritkop102360

TI__Guru* 80190 points

Hello,

Liran Ritkop102360 said:
I am using EZSDK 5.04.00.11 with PSP 4.01.00.07 Uboot 4.04.00.01

You could check this topic:

http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/717/t/220648.aspx?pi239031349=1

It would be better to contact your local field engineer.

Best Regards,

Margarita

0 Liran Ritkop102360 over 12 years ago in reply to Margarita Gashova

Intellectual 300 points

I'm familiar with the referenced post. I think the problem is at the timings, the thing is that i don't understand how to interpret the timings from the LCD datasheet to the clock structure (m,m2,n fields) and to the hsyncstart, hsyncend, vsyncstart, vsyncend as the arguments at the above function.

0 Brijesh Jadav over 12 years ago in reply to Liran Ritkop102360

TI__Guru**** 475655 points

Hi,

From the above table, you timing informtion is below

pixel clock required =30MHz

Horizontal Timing informtion

sync width = 48

front porch = 40

back porch = 88

Vertical Front Porch

sync width = 3

front porch = 13

back porch = 32

Regards,

Brijesh Jadav

0 Liran Ritkop102360 over 12 years ago in reply to Brijesh Jadav

Intellectual 300 points

Thanks Brijesh, But This i know already.. I just don't know how to use these parameters in order to configure the right numbers in the ti814x_vps_configure_venc function and also in the clock configuration function (the n,m,n2 fields)..

0 Brijesh Jadav over 12 years ago in reply to Liran Ritkop102360

TI__Guru**** 475655 points

Hi,

You could look into the TRM to get the idea about how to calculate these deviders and multipliers. The other way is you run the DVR-RDK, set the mode through sysfs and get these devider values.

Regards,

Brijesh Jadav

Processors

Processors forum

dm8148 uboot splash logo issue