TDA4VM: How can I reduce the time spent on the Display nodes

Wang Wang

Intellectual 310 points

Part Number: TDA4VM

Hi TI，

We are working on the TDA4 , SDK 0703.

We use the display node to display 1920*720*2 image.(Image size is 1920 * 720 * 2)

The performance is as below:

About 45 fps.

NODE: CAPTURE1: capture_node: avg = 1484 usecs, min/max = 98 / 3381862 usecs, #executions = 21501
NODE: DISPLAY2: display_node: avg = 20929 usecs, min/max = 14836 / 45226 usecs, #executions = 21501
NODE: DISPLAY1: display_node: avg = 20906 usecs, min/max = 74 / 27336 usecs, #executions = 21501

So , is there any solution to reduce the display node time?

Thanks a lot !

over 2 years ago

0 Brijesh Jadav over 2 years ago

TI__Guru**** 475965 points

Display node does not really take much, it just submits the frame to the driver and comes out. At what fps you have configured capture and display? Can you please share some more info? it could be just because of fps mismatch between capture and display..

Rgds,

Brijesh

0 Wang Wang over 2 years ago in reply to Brijesh Jadav

Intellectual 310 points

Hi TI,

Could you show me how or where to set the capture frequency?

Our sensors and screens are working at 60fps.

Best!

0 Brijesh Jadav over 2 years ago in reply to Wang Wang

TI__Guru**** 475965 points

Frequency for capture is set in the sensor, it cannot be set in the CSIRX.

If your capture and display both are running at 60fps, this ie 20ms is just coming due to capture and display unaligned. capture and display are not exactly aligned, so display could report time at max upto 33ms..

Regards,

Brijesh

0 Wang Wang over 2 years ago in reply to Brijesh Jadav

Intellectual 310 points

Thanks Brijesh,

So , could you show us how to align the capture and display ?

Best!

0 Brijesh Jadav over 2 years ago in reply to Wang Wang

TI__Guru**** 475965 points

There is no example available in SDK to align capture and display...

0 Wang Wang over 2 years ago in reply to Brijesh Jadav

Intellectual 310 points

, so what should I do now?

0 Brijesh Jadav over 2 years ago in reply to Wang Wang

TI__Guru**** 475965 points

Please understand that it is not loading of the DSS node or it does not increase loading on R5F. It is just the difference between capture and display causing this bit higher time..

Why do want to reduce this time? or what exactly issue are you facing?

0 Wang Wang over 2 years ago in reply to Brijesh Jadav

Intellectual 310 points

Hello Brijesh，

I have solved the problem.

This is because of LVDS 'data transfer speed (TI941 1.5G).

It doesn't fit the image. (Size 1920*720 60fps, only 45fps available).

So when I changed the size of the output image to 1280*720, 58~59 fps was available.

Best !

Yann

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TDA4VM: How can I reduce the time spent on the Display nodes