8051 Video

[ahmedragia21]

Hi, How is it possible to use something like 89S52 to make a PAL video or VGA ? i know vga isnt possible cuz it needs more than 24Mhz .. also can i use only C for doing it ?

 

[Ubergeek63]

not going to happen, even spectacularly powerful processors use dedicated hardware to generate video signals.

Dan

 

[ahmedragia21]

I wonder , but i saw someone made NTSC/PAL using PIC16F84 ! and another one made VGA using 16F84... how ?

 

[Ubergeek63]

do you want video or a simple test pattern? Even a simple test pattern requires a lot more than simply software.

Dan

 

[ahmedragia21]

I want to do something like a pong game on the 8051.

 

[3v0]

I want to do something like a pong game on the 8051.

Why would you want to try this with a processor with so little power ?

 

[littletransistor]

One of the sites I've checked out used a PIC 16F84 to output video. But I don't think it'll be *very* easy though.

In the meantime there's other chips which can provide CRT output.

 

[3v0]

But why? Sort of like moving with golf cart instead of a moving truck. You can get the job done but !

 

[ronsimpson]

“I wonder , but i saw someone made NTSC/PAL using PIC16F84 ! and another one made VGA using 16F84... how ?”
____________________
There are many articles describing what you are looking for. It generally takes all the CPU time to draw video. A pong game has very low resolution so a slower computer can be used. During ‘blanking’ time the CPU is free to do some thinking.
As to the old 8051, there are 100mip 8051s available. They run circles around a 5mip 16F84.

 

[ahmedragia21]

3vo, how did you know that the processor is too little for this operation ?

 

[mramos1]

ahmedragia21, Read this, see if it helps.

**broken link removed**

 

[Nigel Goodwin]

Why would you want to try this with a processor with so little power ?

You can run Pong perfectly well on a lowly PIC 16F84, so it doesn't have any massive power requirements. I built a Pong game years ago using one - just as good as the original arcade games.

 

[3v0]

You can run Pong perfectly well on a lowly PIC 16F84, so it doesn't have any massive power requirements. I built a Pong game years ago using one - just as good as the original arcade games.

I get to be wrong once in a while and I stand corrected.

But .... if I were to build a video project I would like some headroom.

3v0

 

[Nigel Goodwin]

I get to be wrong once in a while and I stand corrected.

But .... if I were to build a video project I would like some headroom.

In which case consult books like the 'Cheap Video Cookbook', which use a few cheap TTL chips to generate video using a micro.

But really it depends how much processor time you can afford to waste, as opposed to how much extra silicon you can afford to use.

 

[Ubergeek63]

Pong...ok.
</TITLE> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" /> <title>ePanorama.net - Circuits
**broken link removed**
You need to be able to repeatably get an 11MHz pixel rate. You can use 1.1MHz if the smallest "pixel" you want is 10 pixels wide, and so on for straight PAL. I suspect pong was a larger number than that.

Dan

 

[Nigel Goodwin]

Pong...ok.
</TITLE> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" /> <title>ePanorama.net - Circuits
**broken link removed**
You need to be able to repeatably get an 11MHz pixel rate. You can use 1.1MHz if the smallest "pixel" you want is 10 pixels wide, and so on for straight PAL. I suspect pong was a larger number than that.

You've obviously seen Pong, the requirements aren't very demanding

 

[Ubergeek63]

You've obviously seen Pong, the requirements aren't very demanding

Yep! Poor pong, the atari 2600 killed her! Video table tennis at pizza places

I date myself, oh well.

With out the details it sounded like he wanted to do animation or something and that was simply not going to happen. So many do not realize what goes into even putting up a static image!

Dan

EDIT: by static image I was thinking of a photo frame

 

[blueroomelectronics]

The video cookbook used a KIM1 connected to some shift registers and graphic EPROM 2716 and level circuitry. It was also memory mapped, interrupt driven and could also work with the Z80