Re: Watchdog - all is forgiven


Everett M. Greene wrote:

I've always been impressed by the person who exhibited
the patience of Job in twiddling the 30 or so parameters
until the board worked.

I've been that person. When I was getting the first Digi-Frame up and
running, I had no complete documentation for the VGA controller. A lot
of it was something like this:

Document A:
For more details on this, see Document B where it is explained in
detail.

Document B:
This information has been moved to Document A.

So I used their demo kit to dump out all the CRTC and sequencer
registers (documented and undocumented) for a standard 640x480 VGA
mode. I also dumped out all the documented nonstandard registers. Then
I put a bunch of pushbuttons on my target system and wrote a program
that would let me play with all the parameters. When I got a stable
picture on my LCD, I hit the "dump" button and got a header file... :)

.