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is it possible to use ADV7280M to capture analog video on OMAP4460

Guohui Li1
Prodigy 170 points

Hi,

      we are using ADV7280M to convert analog video data to digital mipi csi2 format, but we face the problem that omap4 always get the broken color bar from csi2 interface, it cann't get the correct image. we found that csi2 can get the interrupt of frame end, but the data is the broken color bar like this:

i tried to configure adv7280m to output single color bar, Boundary Box test pattern or external cvbs camera, but it always output the below image.

so i doubt that the MIPI CSI interface of ADV7280M is not compatible with the OMAP4 CSi2?

in addition, i searched on this forum, some people have used tvp515x to capture analog video, but it seems that nobody has used adv7280M on omap44xx, so is it possible to use adv7280m for capturing cvbs data on OMAP4 platform? thanks very much

  • 0
    TI__Guru**** 161600 points

    Hello,

    The chip you are using ADV7280M converts the analog video signals into a YCrCb 4:2:2 video data stream that is compatible withthe 8-bit ITU-R BT.656 interface standard.

     Now as you can see from Section 8.2.5.1.1 ISS CSI2 Protocol and Data Format OMAP4460 CSI-2 does not support the BT.656 format.  So you cannot connect the ADV7280M to OMAP4460 CSI port.

    Instead you should use the parallel port (CPI) of OMAP4460, as it supports BT.656 data format. 

    Best Regards,

    Yordan

  • 0 in reply to Yordan Kovachev
    Prodigy 170 points

    Hi, Yordan:

           we have debugged the adv7280M, and we found a hardware bug on it, after fixed, omap4 can capture image from adv7280M now.

           in fact, BT.656 also belongs to  format of yuv4:2:2 8bit,  adv7280M will convert the embedded sync within BT.656 stream to short sync packet according to  MIPI-CSI2 protocal,  so it can be captured by omap4 CSI2 interface. 

          thanks.

  • 0 in reply to Guohui Li1
    Prodigy 40 points

    Hi Guohui Li1,

    We are currently facing a problem similar to yours with the colour. Could you elaborate on the hardware problem you found and fixed please?

    Many thanks.

  • 0 in reply to Neil Race
    Prodigy 170 points
    the probelm is associated with the clock and voltage, could you send you adv7280m part of your schematic to me: guohuili@xfengche.com,
    with your schematic, maybe i can fix the probelm specially, thanks you.