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'[EE] VGA output from AVR'
2006\03\06@200029 by Russell McMahon

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Too universal for AVR tag

       http://www.atmel.com/journal/documents/issue6/Pg40_42_VideoAdapter.pdf

His page thereon (Russian and English versions)

       http://www.vga-avr.narod.ru/

This (brilliant) project outputs video to a VGA monitor using an 16
MHz ATMega16 plus a resistor and a crystal. Add a few more resistors
and diodes for the composite video version. While the implementation
is acknowledged by the originator to be 'quick and dirty" it is
brilliantly done given that so many people have said how hard such a
task is. He implements 20 lines of 38 characters in 640 x 480 mode
but, having this design as a proof of concept and coding guide, better
densities should be achievable. Adding a hardware shift register or 3
may well significantly increase potential throughput.

As a bonus it accepts async serial input and also does composite video
out. Also does PAL & SECAM. Doesn't make coffee.

Cornell sourced AVR video generator

       http://instruct1.cit.cornell.edu/courses/ee476/video/


           RM

2006\03\06@202739 by David VanHorn

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I'm impressed.  Something like this has been on my "to-do" list for a while,
but I never really needed it for anything.

The AVR excells at high speed bit-twiddling.  Blowing pixels out at
4Mpixels/sec on an 8 MHz processor is achievable, but it does take some
thinking.

2006\03\07@092607 by fred jones

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1) wish there was a PIC version.
2) accept text to be displayed serially
3) overlay on top of a composite signal
4) output the mixed video in composite format

Asking too much?  :0)

FJ

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Doesn't make coffee.

Cornell sourced AVR video generator

        http://instruct1.cit.cornell.edu/courses/ee476/video/


            RM

2006\03\07@093942 by William Couture

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On 3/7/06, fred jones <spam_OUTboattowTakeThisOuTspamhotmail.com> wrote:
> 1) wish there was a PIC version.

http://yusoft.kulichki.com/english/pic/my_proj.htm

> 2) accept text to be displayed serially
> 3) overlay on top of a composite signal
> 4) output the mixed video in composite format

http://dt.prohosting.com/pic/

> Asking too much?  :0)

You can ask for anything.  Whether or not you get it is another
matter entirely.

Bill

--
Psst...  Hey, you... Buddy...  Want a kitten?  straycatblues.petfinder.org

2006\03\07@094007 by David VanHorn

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On 3/7/06, fred jones <.....boattowKILLspamspam@spam@hotmail.com> wrote:
>
> 1) wish there was a PIC version.


I've seen pics do this, though with much lower resolution


2) accept text to be displayed serially
> 3) overlay on top of a composite signal
> 4) output the mixed video in composite format


A little more difficult, but not that bad.
You need to detect H and V sync in the video signal, and use that to kick
off the video generation.

Asking too much?  :0)


Other than point #1, I don't think so.

2006\03\07@102607 by fred jones

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They used to make a chip, STV5730A, that easily interfaced with a PIC to do
this but unfortunately they discontinued it and I haven't found a similar
replacement.

http://www.blackboxcamera.com/Stv5730a/STV5730A.htm


=====================================================
From: "David VanHorn" <dvanhornspamKILLspammicrobrix.com>

> 1) wish there was a PIC version.


I've seen pics do this, though with much lower resolution


2) accept text to be displayed serially
> 3) overlay on top of a composite signal
> 4) output the mixed video in composite format


A little more difficult, but not that bad.
You need to detect H and V sync in the video signal, and use that to kick
off the video generation.

Asking too much?  :0)


Other than point #1, I don't think so.


2006\03\07@112151 by Harold Hallikainen

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As I've mentioned before, it'd be great to have a chip with an SPI
interface that would output VGA video!

Harold


{Quote hidden}

> -

2006\03\07@124822 by David VanHorn

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On 3/7/06, Harold Hallikainen <.....haroldKILLspamspam.....hallikainen.com> wrote:
>
> As I've mentioned before, it'd be great to have a chip with an SPI
> interface that would output VGA video!


A programmed AVR? :)

2006\03\07@125915 by William Couture

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And, while I remember old stuff:

  www.speechchips.com/shop/item.asp?itemid=7
  http://www.speechchips.com/shop/item.asp?itemid=14

Bill

--
Psst...  Hey, you... Buddy...  Want a kitten?  straycatblues.petfinder.org

2006\03\07@132012 by David VanHorn

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On 3/7/06, William Couture <EraseMEbcouturespam_OUTspamTakeThisOuTgmail.com> wrote:
>
> And, while I remember old stuff:
>
>   www.speechchips.com/shop/item.asp?itemid=7
>   http://www.speechchips.com/shop/item.asp?itemid=14


Hmm.. Which 8 pin AVR would I use for this... :)
I'd be MOST impressed with an implementation in the tiny-11, since it has no
ram.

2006\03\07@142336 by Robert Rolf

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BOB-3 from http://www.decadenet.com/bob3/bob3.html $99 USD.
Cheats a bit by using an OSD display chip, but it's turnkey.

Dontronics has VGA flavors, including a  USB version
http://www.dontronics.com/micro-vga.html
for somewhat less. No video in.

Robert

fred jones wrote:
{Quote hidden}

2006\03\08@042107 by Alan B. Pearce

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>> As I've mentioned before, it'd be great to have a
>> chip with an SPI interface that would output VGA video!
>
>A programmed AVR? :)

Well, I have suggested here before, that I see a dsPic as ideal for this,
with its high PLL multiplier to get internal processing rates that could do
something with the video stream.

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