On Wed, 5 Sep 2001, Ron wrote:
> I guess my first question would be, if your talking NTSC video at
> 60 fields per second i.e. normal 30 frames per second video, why
> are you bothering to use RTLinux in the first place, even an
> old 33mhz 486 can service interrupt rates that low (and do large
> amounts of processing in the interrupt service routine) without
> breaking a sweat. I've done it myself some years ago with a frame
> grabber I designed around the old philips SAA7195 chip set. Try
> doing what you need to do in userland, just as a test, I'll bet
> you'll see that 16ms is a very very long time on any newer
> processor.
The frame grabber can indeed service the interrupts without a problem, but I
need to know, with an error of at most 1 or 2 ms, exactly when the frame was
taken. I know that I would be likely to be within that margin 99% of the
time, but I really need consistent precision....
Loren
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