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