On Fri, 21 Jan 2011, Chris Morley wrote:
Date: Fri, 21 Jan 2011 02:16:20 +0000
From: Chris Morley <chrisinnana...@hotmail.com>
Reply-To: "Enhanced Machine Controller (EMC)"
<emc-users@lists.sourceforge.net>
To: EMC <emc-users@lists.sourceforge.net>
Subject: [Emc-users] FW: Problem fast thread on Ubuntu 10.04 EMC 2.4.6
From: chrisinnana...@hotmail.com
To: klemen.oze...@gmail.com
Subject: RE: [Emc-users] Problem fast thread on Ubuntu 10.04 EMC 2.4.6
Date: Fri, 21 Jan 2011 02:09:48 +0000
Sorry I meant to send this to the list.
Date: Thu, 20 Jan 2011 21:44:54 +0100
From: klemen.oze...@gmail.com
To: Emc-users@lists.sourceforge.net
Subject: [Emc-users] Problem fast thread on Ubuntu 10.04 EMC 2.4.6
Dear All,
what could be the reason that on Ubuntu 10.04 with EMC 2.4.6 I always get an
error when i want to start old configuration from EMC 2.3... see error
message below + HAL and INI file (this are files made by pncconf - new one
<snip>
HAL file:
# Generated by PNCconf at Sun Jan 16 10:33:41 2011
# If you make changes to this file, they will be
# overwritten when you run PNCconf again
loadrt trivkins
loadrt [EMCMOT]EMCMOT servo_period_nsec=[EMCMOT]SERVO_PERIOD
num_joints=[TRAJ]AXES
#počasnejši thread za classicladder
loadrt threads name1=fast-thread period1=80000
loadrt probe_parport
The reason is because the line that loads the threads is not correct, there is
no period
length given for the first thread, so it picks one and then the second thread
happens
to be shorter then it causing an error.
Was there a reason that you needed to edit the pncconf file? Not that there is
anything
wrong with that I just looking for feedback about pncconf.
There has been quite a few bug fixes to pncconf since 2.3 it may be worth
starting
fresh and building a new config.
One thing I might warn you about is that in practice using a fast thread with
the Mesa
boards doesn't usually work well. In fact later versions of pncconf do not
allow you to
add a base (fast) thread for this reason. When I was testing steppers using Mesa
and a config with a base thread the steppers were unusable, after removing the
base
thread (which actually did nothing) the steppers magically worked well. Other
users
have reported that if you play with the values you can come up with a values for
the base thread and servo thread that will work but I wouldn't recommend this.
It has to do with the base thread interrupting the servo thread .
I wonder if you could use pwm gen to produce the charge pump signal?
Chris M
Actually AFAICT theres no problem with a fast thread and servos (klemens
situation), the problem only shows up in some systems with step generators and
only if a base thread is invoked but not used, which is why the developer
did not see it (why have a base thread if it is not used)
If you have any evidence that the base thread causes a problem if it actually
runs something I would like to hear about it...
Peter Wallace
Mesa Electronics
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