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Looking for Camera Interface Support

Mike Fontes57049
Prodigy 30 points
Other Parts Discussed in Thread: DM3730

Hi,

 

I am getting ready to develop a system using a CMOS Line Sensor and the DM3730 processor.  I would like to find a way to connect the sensor  through and A/D running at ~40 Mhz to the CISP interface on the processor.  Has anyone done this?  I have been checking out the Camera Interface information in the sprugn4c app note.  It is highly software and register intensive.  That is great, but it doesn't answer hardware based questions.  Is there a similar document that is more hardware based?  Is there an apps person who can help me with the details?

 

Mike Fontes

  • 0
    Genius 3685 points

    Hi Mike,

    I think you can find what you are missing in the DM3730 datasheet, which you can find at: http://focus.ti.com/lit/ds/symlink/dm3730.pdf

     Best regards - Good luck
      Søren

  • 0 in reply to Soren Steen Christensen
    TI__Intellectual 1280 points

    Mike,

    Some additional information.  Cam_xclka/cam_xclkb could be used to drive clk pulse generator input of line sensor as well as clk generator of ADC to synchronize data path.  In this mode of operation you would need to provide HS/VS signals.  Refer to Section 6.2.4.1 of 37xx TRM, SPRUGN4, Parallel Generic Configuration Protocol and Data Format in reference to synchronization signals and data timing for this generic sync mode of operation.

  • 0 in reply to JamesJ35562
    Prodigy 30 points

    James,

    Thanks for the pointers into the specs.  I have been looking at them trying to decide which signals I have to create and what I could get out of the 3730.  That is why I sent out this request.  I was wondering if anyone had already interfaced an A/D directly to the 3730, running at a high speed like I need, and using the Camera input.  It seems a natural job for the peripheral.  I was hoping for some more detailed schematic info for this type of application, but what I am finding is more of the programmer's reference register based descriptions.

  • 0 in reply to Mike Fontes57049
    Genius 3685 points

    Hi Mike,

    I have interfaces several different kind of sensors/chips to the camera input port of OMAP, and there is really not that much to it seen from a HW point of view :-) The SW is the problem.

    Basically you need 8-12 bits of data signals, H/V-sync and a pixel-clock (all highly configurable). You can as well have the main clock either provided by OMAP or input to OMAP AFAIR. Normally you will as well have some kind of auxiliary connection (SPI/I2C) for configuring the input device. Last but not least you need to make sure all your signals are 1V8 logic, and you will be just fine...

    In case you can tell a little more about which A/D-converter you plan to interface it will be easier for people to give relevant advice...

    Best regards - Good luck - I hope this helped
      Søren