On Wed, 25 Oct 2023, Todd Zuercher wrote:

Date: Wed, 25 Oct 2023 12:22:40 +0000
From: Todd Zuercher <to...@pgrahamdunn.com>
Reply-To: "Enhanced Machine Controller (EMC)"
    <emc-users@lists.sourceforge.net>
To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net>
Subject: [Emc-users] Mesa Step Pulses?

Hello,

It is my understanding that the step pulses generated by Mesa cards are always the minimum pulse length set by for example hm2_5i25.0.stepgen.00.steplen, only the space between the pulses is varied by the step rate, is that correct?

I was reading the manual for the new drive I was planning to use in my next build and see that the drive calls a preference of a 50% duty cycle for step pulse inputs. I am guessing that it may have something to do with how the drive's pulse filtering system works, such that for maximum noise filtering and step reliability having the pulse length be approximately equal to the step spacing gives the best results.

So my questions are; Would it be possible to make a Mesa card output a 50% duty cycle step pattern instead of the current default pattern? And would doing this even be worth the effort?

Its possible with a minor firmware change and LinuxCNC driver
change to enable the mode.


Todd Zuercher
P. Graham Dunn Inc.<http://www.pgrahamdunn.com/index.php>
630 Henry Street
Dalton, Ohio 44618
Phone:  (330)828-2105ext. 2031


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Peter Wallace
Mesa Electronics


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