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DVI out from Prop with TFP410? — Parallax Forums

DVI out from Prop with TFP410?

RaymanRayman Posts: 14,827
edited 2009-05-04 02:18 in Propeller 1
It'd be nice to have DVI/HDMI output...

Looking over how the BeagleBoard does it, they use a TFP410 from TI...· Seems like we should be able to use the existing VGA drivers and hook up the output pins to this chip instead of the resistors.·

Not so sure how to generate the clock signal though...

Comments

  • johnfl68johnfl68 Posts: 72
    edited 2009-05-02 00:13
    Has anyone had any success with a prop DVI driver/circuit yet???

    Inquiring minds want to know? smilewinkgrin.gif

    John

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    Bernard Abbott: We are the United States Government! We don't do that sort of thing.
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  • tonyp12tonyp12 Posts: 1,951
    edited 2009-05-02 03:19
    http://en.wikipedia.org/wiki/Digital_Visual_Interface

    Minimum clock frequency: 25.175·MHz
    Bits per pixel: 24

    DVI/HDMI are digital serial.
    10 bits provided on each of the three data channels.

    With some·external serial shifting and clocking,
    I could see·that possible·5:6:5 can·be done withe the prop
    ·
  • AleAle Posts: 2,363
    edited 2009-05-02 05:14
    If the clock can be output and 1 pixel per clock is shifted (to have 640x480 or more syncs but I'm not really sure) that IC could be used directly. The unused bits can be grounded. Of course high-color would be nice but the resolution price is a bit high :-(. We need Prop2 !!
  • RaymanRayman Posts: 14,827
    edited 2009-05-03 00:38
    I've got free samples of the TFP410, but haven't yet found the time to draw up the circuit board... But, my plan is to do as Ale suggests and just use the same resolution as the standard Prop VGA driver (6-bit) and ground all the other color pins. I think it will be an improvement just to have the digital transmission, even if the color depth is the same...
  • OwenSOwenS Posts: 173
    edited 2009-05-03 14:48
    Rayman: Repeat the pins, starting with the MSB. For example:

    Prop -> Chip
    R1 -> R7
    R0 -> R6
    R1 -> R5
    R0 -> R4
    ...

    That way you can get the full brightness range
  • RaymanRayman Posts: 14,827
    edited 2009-05-03 21:59
    That's interesting! Have to think about it, but that looks like a good idea.

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    visit http://www.rayslogic.com
  • mctriviamctrivia Posts: 3,772
    edited 2009-05-04 02:18
    if you get this working I am sure you could do well selling as spinstudio module.

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