Actions
Forum Thread Details
  • State Not Answered
  • Replies 2 replies
  • Subscribers 313 subscribers
  • Views 181 views
  • Users 0 members are here
Related

Access video data in bare Metal

Former Member

Hello,

Right now we have the following configuration working on Zedboard with FMC imageon card

Video (HDMI) in --> Handwritten Video Processing IP(HDL) --->AXI4 stream --->VDMA (High Preformance AXI)---> DDR3 ---> VDMA(High Preformance AXI) --->AXI4 stream --->Video Out

We want to put some handwritten Video processing algorithm code in C in ARM, but not sure how to access access video data in the ARM.  Which functions should I use?

  • 0

    The AXI_VDMA core's driver can be used to start/stop the video DMA.  It can also be used to obtain the current frame store number, as well as the base address for each frame store.

    If you cannot start/stop the video DMA due to real-time requirements, then an interrupt routine should be used to monitor which frame store is currently ready (and not being accessed by the input or output video paths).

    Let me know if this helps.

    Regards,

    Mario.

  • 0 in reply to albertabeef

    Yup, that helped! we just need to figure out now the interrupt part now.  currently we let VDMA write the video to DDR, our code reads the image, processes it and put's it back in the DDR at a different location and have it stream out.  Since we have no interrupts, we are dropping some frames.  The reference design was huge.

    One last question?  I am finding that the locking of HDMI input is random.  Sometime it locks in, sometimes it doesn't.  Inspite of several rebuilds, with exact settings of Vivado and SDK the behavior of video locking in is random.  Can you comment on this, please? :)

    Cheers,
    Pre from MathWorks