DM816x - SD display through DM8168_DAC_CVBS

Away.liu

Hi all:

We are using dvr_rdk4.1 and dm8168.

I tried to run usecase of demo_vdec_vdis.c , I found the setting by invalid

vdisParams.deviceParams[VDIS_DEV_SD].resolution = VSYS_STD_PAL;

cannot output video through DAC_CVBS(pin of AR20).

The HDMI display is ok. but cvbs output have no video out, the receive of cvbs output are blank all.

If I need to decode and display video use DAC_CVBS ,How should I change the usecase?

Looking forward to any answer.

0 Eason Wang over 9 years ago

Are you using a customized board?

I would suggest use boot logo feature under uboot to make sure the hardware side has no problems.

BR,

Eason

0 Away.liu over 9 years ago in reply to Eason Wang

yes,i am using a customized board.

Tthe HDMI display is ok, the DA_CVBS to dispaly is easy for design, It should be no problem.

0 lastshad0w over 9 years ago in reply to Away.liu

Expert 1385 points

HI liu,

setting of "vdisParams.deviceParams[VDIS_DEV_SD].resolution = VSYS_STD_PAL; "is not enough,

refer the TI_814X_BUILD case of multich_vdec_vdis.c, displayId[1] is SDTV

0 Away.liu over 9 years ago in reply to lastshad0w

HI weige:

I have tried you said before this topic started.

But not effective .

0 Steve Clynes over 9 years ago in reply to Away.liu

Check here for more information on the HDVPSS and SD display sub-systems.

http://processors.wiki.ti.com/index.php/DM816X_AM389X_VPSS_Video_Driver_User_Guide

BR,

Steve

Processors forum