Re: [oopic] Re: reading a high speed D-wave pulse from a compass

thanks Rick. I had read that oopic had a problem with
accurate timing operations.
My thought was that I could start a counter at the
first pulse, then knowing the duration of the pulse
stop the counter after a spcific amount of time. I
think that I could live with it missing one or two
pulses on either end
--- rtstofer <rstofer@pacbell.net> wrote:

> --- In oopic@yahoogroups.com, Jerry Baccari
> <jerry_baccari@...> wrote:
> >
> > I mis-stated the frequency of the pulse. It is
> > actually 50khz. Does this bring it back into the
> realm
> > of the OOPIC?
>
> Sure, the OOPic can count the pulses at that rate.
> The problem is to
> know when to start and stop counting. Looking at
> the scope images
> you sent me off-line, it appears that there is a
> wide front porch
> pulse followed by the pulses to count.
>
> The dickens will be in detecting that front porch.
> Measuring pulse
> widths isn't a strong point for the OOPic. You not
> only need to
> detect the front porch, you need to zero the
> counter. Actually, I
> guess you need to grab the previous reading at this
> time as well.
>
> With a regular PIC, you could time the width of each
> pulse looking
> for a pulse above a certain width. This would be
> used to reset the
> counter. Subsequent pulses would increment the
> counter.
>
> Richard
>
>
>

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