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[DaVinci dm355] demo issue: black and white video display

Hi,

I have a problem with the dm355 demo. When i run the demo for the first time the output coming from the tv out was black and white.

After some changing in the boot menu i obtained the tv out signal with color, but when i rebooted the dm355 the demo has black and white output.

By the way the encode+decode demo can't run when my input is a color camera.

I think it can be a dm355 hardware problem. What do you think?

Here there is my printenv:

>DM355 EVM # printenv
>bootdelay=3
>baudrate=115200
>bootfile="uImage"
>nfshost=192.168.1.2
>rootpath=/home/workdir/filesys/target
>filesize=183098
>fileaddr=80700000
>ipaddr=192.168.1.3
>serverip=192.168.1.2
>bootcmd=nboot 0x80700000 0 0x400000; bootm
>bootargs=console=ttyS0,115200n8 noinitrd ip=192.168.1.3:192.168.1.2:192.168.1.1:255.255.255.0:::off root=/dev/mtdblock3 rw rootfstype=yaffs2,nolock mem=116M'
>stdin=serial
>stdout=serial
>stderr=serial
>videostd=pal

 

  • davide leoncini said:
    I have a problem with the dm355 demo. When i run the demo for the first time the output coming from the tv out was black and white.

    After some changing in the boot menu i obtained the tv out signal with color, but when i rebooted the dm355 the demo has black and white output.

    Depending on your version of the DVSDK the demos may require extra video options on your bootargs to function, you may want to check your getting started guide to see what bootargs are suggested, this may be leading to some of the problem here, though I have not done much testing with PAL. Also note that if you are wanting to have PAL output from the board that your bootargs needs to contain such a parameter, it varies depending on your DVSDK version though so you will again want to check your getting started guide for what bootargs you should be using for PAL (this should be covered in an appendix).

     

    davide leoncini said:
    By the way the encode+decode demo can't run when my input is a color camera.

    I think it can be a dm355 hardware problem. What do you think?

    This sounds strange, the board should certainly be able to accept a color video input as this is the most common use case and is heavily tested, perhaps the output from your particular camera is not standard, have you tried other composite color video sources? If anything I would expect issues if you were feeding in a black and white video stream with no color, as that might confuse the video decoder and v4l2 driver since it is not used/tested as much. This could also be related to having the board not setup for the video standard (NTSC/PAL) that you are working with.

  • hi,

    its good to see you got output.

    kindly let me know the links you followed for dm355evm.

    Thanks and Regards,

    Mohammed asif.