FTDI EVE3 GPU --> VGA

Rayman

Here's another way to use the EVE series of GPUs with P2.
Previously used ADV7125 to convert 24-bit colors to VGA: http://forums.parallax.com/discussion/172283/ftdi-eve3-gpu-vga

Here I'm using the P2 to convert the 24-bit colors to VGA using DACs.
Also using P2 to generate clock for EVE3 chip.

So far, got regular VGA mode, 640x480, working.
May not be able to get much better with this board because the color pins aren't in the best position.
I need a shift to get them in position.

I'm currently using 2 cogs to do this. One just parrots the EVE3's sync signals. The other parrots the colors.
Here's the infinite loop that reads the 24-bit colors from INB and then sends it to DACs:

FastPixelLoop
              rep       @.end3,#0 'loop forever
              mov       c,inb
              waitse2
              shl       c,#8
              setdacs   c
.end3

If the colors where on better pins, could get rid of the mov and the shl instructions and probably get higher resolution.
But, I should be able to at least see if a higher resolution will work on a better board.

Wuerfel_21

You could probably get away with just one cog - wait for hsync, emit sync pulse/back porch, do the color copy loop (but counted 640 times), go back to waiting. Needs some special case for VSync, I guess.

Rayman

Maybe could do syncs in main cog using interrupts... Or, maybe can do other things with the sync cog... Something for later...

Rayman

Having some luck getting the Gameduino code working on P2.

Tubular

Nice going Rayman!

Rayman

Thanks. Here's some more screenshots...

There was a bug in the Matrix Orbital library that set me back a while...
It wouldn't draw numbers because the command# for that was wrong...
Fixed like this:

#define CMD_NUMBER           0xFFFFFF2E//RJA fixed this 0xFFFFFF38

Rayman

Working up to more impressive Gameduino examples...

Rayman

Got jnr and frogger codes working (I think).
but, need to add user input somehow to tell for sure...