Re: following error question

[Jon Elson <elson-at-pico-systems.com>]

Richard Everett wrote:

>
> Ok, now I am getting confused.  What is smdromod?  It sounds like that
> actually performs better than steppermod or freqmod.  What are the ups and
> downs of using smdromod?

smdromod is a derivative of freqmod which accepts encoder inputs from the
Dan Mauch/Tom Kulaga DRO interface board as position feedback.  freqmod
and smdromod have a step pulse generation task that runs at a high rate
determined mostly by experimentation, such that it just allows enough free
time for the rest of EMC, linux, Xwindows, etc. to give reasonable response.
You need a pretty fast computer to run it at the 16 uS interval that Dale is
running his at.  steppermod and freqmod do not use external feedback, so they
are "open loop".

Jon