Re: High stepper rate troubles

["Lawrence Glaister" <lg-at-jfm.bc.ca>]

you probably need to increase the PERIOD variable from 0.000016 to something
like 0.000048, and I would try using freqmod instead of steppermod.o. ( I am
running the latest cvs release on redhat 6.2 with 2.2.14 kernel patched with
rtlinux_2_2a). I'm not sure if the older versions of emc
have the freqmod.o module. The above period works with my P133. I can get
away with 0.000032 but there is very jerky gui interaction at that rate.
0.000016 definitely locks me up when the motor controller module loads.
=======================================================
Lawrence Glaister VE7IT             email: lg-at-jfm.bc.ca
1462 Madrona Drive                  http://jfm.bc.ca
Nanoose Bay BC Canada
V9P 9C9
=======================================================
----- Original Message -----
From: John Weismiller <johnweis-at-home.com>
To: Multiple recipients of list <emc-at-nist.gov>
Sent: Thursday, November 23, 2000 12:31 PM
Subject: High stepper rate troubles


>
> Hello all,
>
> I am a hobbyist with a CNC converted Sherline mill using steppers
> driven by Geckodrive G201 stepper drives.  I am running emc-0.9-25 with
> steppermod.o.
>
> With my setup, I get a INPUT_SCALE of 40000.  This value is so high that
> it crashes the computer after the modules have been loaded.  It looks to
> me like there are too many interrupt per second so nothing else gets a
> chance to run.
>
> So my question is this:  How do I fix it?  I tried lowering the
> MAX_VELOCITY variable, but that did not help.
>
> Thanks,
> John.
>
>
>