[olug] Parallel port interrupt

[Eric Penne]

Rethinking my previous post.  The maximum pulses per second should be:

1/(0.010+0.000069) = 99.3 or 99 full pulses.  Much faster.  I'm pretty
sure we can handle this.

>
> With the right settings from a non-realtime kernel using a
> gettimeofday() and a parallel port interrupt signal, I think the minimum
> number of pulses per second that we could detect would be 1/(0.010 +
> 0.069) = 12.7 or 12 full pulses.  Therefore as long as the power meter
> doesn't pulse more than 10 times/second we won't be worried.  Switching
> to a real time kernel probably won't give us more than 30 pulses per
> second.  In that case we may need to switch to another option of using a
> microcontroller as the interrupt handler that just outputs RS232 to the
> control PC.
>
> FYI
> Eric
>
>
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