[FAQ] TDA4VM: Display for more than 1920 input resolution

JaeWook Kim

Intellectual 370 points

Part Number: TDA4VM

Dear TI,

I have a custom board that working with 2560x800 resolution DSI display.

I'm trying to display 2560x800 resolution image combined two camera as below using "app_multi_cam".

CAM 1(1280x800)

CAM 2 (1280x800)

(Actually when I checked the final file got by set the config "en_out_img_write" in app_multi_cam.cfg, it is properly combined)

But when I try this, Only CAM1 image is full screen(2560x800) displayed. It looks that scale up to 2560x800.

I think if output width is bigger than 1920, there is some problem.

Could you let me know how to display 2560 width image in app_multi_cam?

Thanks,

Jaewook

over 3 years ago

0 Brijesh Jadav over 3 years ago

TI__Guru**** 467595 points

Hi Jaewook,

Do you mean 1920x800 resolution is getting upscaled to 2560x800? So you still see both the camera output, but second camera output is not complete..? Can you please confirm this understanding?

When you say DSI got it working with 2560x800 resolution, did you check with some input image? or it was with some fixed color bar pattern?

Regards,

Brijesh

0 JaeWook Kim over 3 years ago in reply to Brijesh Jadav

Intellectual 370 points

Hi Brijesh,

Thank you for the quick reply.

I'd like to show image file that is final output image combined in app_multi_cam.

But for some reason, I can't upload large size files.

At first, this is my goal.

Both cam 1 and cam 2 are down-scaled to 1280x800.

And these are combined side by side to 2560x800 properly in app_multi_cam.

However, cam1 image is shown on both DISPLAY 1 and 2 as upscaled 2560x800.

The cam2 is shown properly on DISPLAY 2.

On DISPLAY 2, camera 1 and camera 2 are overlap.

I used camera input image instead of fixed color bar pattern.

Please let me know if you don't understand anything.

Thanks,

Jaewook

0 JaeWook Kim over 3 years ago in reply to JaeWook Kim

Intellectual 370 points

Hi Brijesh,

Sorry, I missed an answer to your question.

I checked the DSI 2560x800 operation by color bar pattern, app_tidl and app_single_cam application.

Thanks,

Jaewook.

0 Brijesh Jadav over 3 years ago in reply to JaeWook Kim

TI__Guru**** 467595 points

Hi Jaekwook,

There is one fix in the DSS driver, which potentially could affect resolution beyond 1920.

Could you please apply attached patch on ti-processor-sdk-rtos-j721e-evm-07_03_00_07\pdk_jacinto_07_03_00_29\packages\ti\csl folder and try it again?

/cfs-file/__key/communityserver-discussions-components-files/791/0001_2D00_DSS_2D00_CSL_2D00_FL_2D00_Bug_2D00_Fix_2D00_PDK_2D00_9681_2D00_DSS_2D00_displays_2D00_corrupted_2D00_d.patch

As i understand correctly, the camera captures image at 1920x1080 resolution, but you downscale them to 1280x800 and put them side by side using mosaic node, transmit this resolution 2560x800 via DSI and split them in serializer. Is this correct understanding?

Regards,

Brijesh

0 JaeWook Kim over 3 years ago in reply to Brijesh Jadav

Intellectual 370 points

Hi Brijesh,

That's right. You are perfectly understood.

After apply your patch. It's working well.

I really appreciate you.

Best Regards,

Jaewook

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[FAQ] TDA4VM: Display for more than 1920 input resolution