I have the Rev B version of the Propeller Project Board USB, and I think I'm seeing the same issue reported by the OP. I can run the VGA Text Demo from the OBEX, but it will blink off, and then come back on after a few seconds. Sometimes it takes a few downloads before it starts running. I'm trying to run another program I developed that runs at 640x480 resolution, but it never displays.
I tried drilling out the trace as described in the previous post, but it doesn't make any difference. BTW, what is the magenta trace that goes around the XI pin? I want to make sure I didn't accidentally hit that trace.
Has anybody seen any problems with VGA on the PPB USB? I have another board, but I don't want to spend a lot of time on it if there's a generic problem with VGA on this board.
Dave, I think it's safe to assume the magenta line is the part outline of the crystal in the layout software. You can see traces on three of the four layers in the CAD image. From the image of the real board, it's clear there isn't a trace on the top layer.
I suppose it's possible it could be on the same layer as the brown traces but a rounded trace like that wouldn't make much sense. Besides, you can also see a little of the magenta outline of the Propeller chip which give extra weight to the idea magenta is used to show part outlines.
It looks like I missed the XI trace the first time, so I drilled a bigger hole, and now the VGA works. I was concerned about hitting another trace, but the magenta line does look like the outline of the crystal, and not a trace. Thanks, Duane.
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I tried drilling out the trace as described in the previous post, but it doesn't make any difference. BTW, what is the magenta trace that goes around the XI pin? I want to make sure I didn't accidentally hit that trace.
Has anybody seen any problems with VGA on the PPB USB? I have another board, but I don't want to spend a lot of time on it if there's a generic problem with VGA on this board.
I suppose it's possible it could be on the same layer as the brown traces but a rounded trace like that wouldn't make much sense. Besides, you can also see a little of the magenta outline of the Propeller chip which give extra weight to the idea magenta is used to show part outlines.