On 10 Jan 2007 09:28:03 -0800, the renowned "wallge"
<[email protected]> wrote:

>I would like to superimpose some text into a video stream coming from a
>camera into my fpga.
>Lets say I would like to print the values of several registers to the
>screen as simple ascii text. This text would be superimposed over the
>incoming video stream. Does anyone know if there exists a core, or some
>free vhdl floating around somewhere to do this kind of thing?
>I have seen some cores that do VGA timing generation, then insert pixel
>values values from a look up table (but these dont do text from what I
>can tell, and must be controlled by a microprocessor).
>
>The problem with these is that they dont really do what I want. Really
>what I want is a function that would
>convert the value of a register into say, hex or base 10 ascii text,
>and then count the number of
>rows/columns of video coming in, and insert black or white pixels into
>the video stream as appropriate to make those characters appear
>(superimposed) on the output video stream.
>
>Anyone have any ideas or thoughts?
>
>thanks.

You might get some hints by looking at the data sheet for the STV5730A
OSD chip.


Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
[email protected] Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com