On Wed, 20 Apr 2016, fritz wrote:
> Date: Wed, 20 Apr 2016 22:15:49 -0400
> From: fritz <fritzli...@gmail.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 5i25/6i25 +7i76 problems with 2.7.4
>
> In the process of upgrading every computer I have, I've come up against some
> problems with my cnc install.
>
> I have tried 4 different linuxcnc installs; 2.6.12 at an intermediate stage,
> and 3 different 2.7.4 installs. I've even tried building from source, so
> technically I've done more than just 4.
>
> First, a i386 Debian Jessie install:
> - from buildbot: 2.7.4-uspace
> - from Jessie backports: 4.4 rt_preempt kernel
>
> Second, a amd64 Debian Jessie install:
> - from buildbot: 2.7.4-uspace
> - from Jessie backports: 4.4 rt_preempt kernel
>
> Third, an install using the current Debian Wheezy iso from linuxcnc.org,
> apt-updated to linuxcnc 2.7.4
>
> My hardware:
> - AMD E350 dual-core with integrated graphics
> - Mesa hostmot2 6i25 + 7i76
>
> The mill:
> - Taig cnc micromill
> - Huang(?) VFD and spindle
> - Gecko 540 stepper driver
>
> I went about upgrading and ended up on linuxcnc 2.6.12. I 'rebuilt' my
> config using pncconf. This had a strange result of that while the stepper
> and digital I/O were working, the 7i76 spindle output no longer worked. I
> even tried doing a new config with pncconf, with the same result.
>
> I saw that linuxcnc 2.7 was stable, so I did an install on a separate drive
> for that. I installed linuxcnc 2.7.4 for uspace. I carried over my conf
> file, and rebuilt the config using pncconf again.
>
> Now, the VFD output works, the digital I/O works, but any axis movement
> results in a following error.
>
> There *is* stepgen output, because I have one stepgen output as the charge
> pump to the Gecko 540, and it clearly indicates when it is enabled.
>
> What is really funny is that even if I increase the following error by orders
> of magnitude, this merely delays the following error, and produces no stepper
> motion at all.
>
> How does linuxcnc make a following error with open-loop steppers?
> How would linuxcnc be able to setup the charge pump stepgen, but not my XYZA
> axis?
>
> Attached is my config files, and one session of verbose debug output.
>
> My next move is to go back to some earlier linuxcnc version, but I'm not sure
> which one, yet.
>
If you had working configuration files, use them. regenerating them with
PnCConf is going to be much harder. There are only a few minor differences
that need changing on the hal files when upgrading from 2.6.x to 2.7.x
and these are easy to do by hand editing the files
>
>
Peter Wallace
Mesa Electronics
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