Re: [CAD_CAM_EDM_DRO] Re: step pulse timing resolution

Sorry mat, I misunderstood your question. I think that using 8192
interrupts/second and then always interrupting at that frquency, I should be
able to make a table of how often to pulse. This gives me a granularity of
122 us (roughly) and then by using a common algorithm (similar to that used
for drawing lines in x,y axis) pulse at the algorithm calculated times. It
won't be perfect , but it just might work to make a very smooth linear ramp.
On the
other hand I could be wasting my time, but thats what programming is all
about.

Art

----- Original Message -----
From: "Matt Shaver" <mshaver@...>
To: <CAD_CAM_EDM_DRO@egroups.com>
Sent: Friday, October 13, 2000 5:18 AM
Subject: Re: [CAD_CAM_EDM_DRO] Re: step pulse timing resolution


> > From: Jon Elson <jmelson@...>
>
> > >Matt Shaver wrote:
> >
> > > > From: Art Fenerty <fenerty@...>
> > > > I do have a question though, how many pulses/second are actually
> > > required
> > > > for most people. A VXD is not very
> > > > hard to write for up to 8192 pulses per second
>
> > > I'd like the following output step rates:
> > >
> > > 8000 Hz
> > > 7999 Hz
> > > 7998 Hz
> > > <...>
> > > 3 Hz
> > > 2 Hz
> > > 1 Hz
> > > .9 Hz
> > > etc.
> > >
> > > Can this be done without locking up the GUI? If so, how?
>
> > Nope, can't be done by a CPU. 8000 Hz is a period of 125 uS, 7999 Hz is
> > a period
> > of 125.016 uS, or only a difference of 16 nS! You SURE can't interrupt
> > a Pentium - ANY pentium - every 16 nS!
>
> OK, I admit I should have thought this through a little more. Of course I
> don't need that fine a granularity, I just need finer granularity than
we've
> been able to achieve thus far with software only solutions. The point I
was
> trying to make was that achieving maximum pulse rates isn't really the
> problem with software based stepper control. I would like to know what
sort
> of granularity Art thinks he can get out of his VXD solution, and how he's
> going to do it.
>
> Matt
>
>
>
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