I tried this (pyvcp.hal & pyvcp.xml) , but it kept giving me the error
"waiting for component 'pyvcp' to become ready. I don't believe it's in the
.xml file because I substituted a very simple file and it still wouldn't get
past the pyvcp command. It did, however generate the display.
From: Dave Engvall <[EMAIL PROTECTED]>
On Jan 4, 2007, at 10:21 AM, [EMAIL PROTECTED] wrote:
> "James Reed" <[EMAIL PROTECTED]> wrote:
>
>> I try to be an open minded person. SInce I don't understand pyVCP
>> yet, and
>> I know a little about Qt3, I thought trying both would be a good
>> learning
>> experience. I haven't heard much about what the 2 minutes with
>> pyVCP would
>> entail, either. I think I have soemwhat of a grasp on HAL, but
>> that is
>> because of the good documentation EMC has provided.
>
> Both approaches have their own strong points. As Jeff
> demonstrated, the
> Qt code can easily make a nice DRO style display when EMC is running.
> http://axis.unpy.net/01167918097
>
> But it does require EMC to be running - it uses NML to get its
> data, and
> the NML data comes from EMC. That in turn means that a number of EMC
> specific requirements need to be met. For example, if you are
> trying to
> make a DRO for a manual machine, EMC will trip on a following error as
> soon as you turn the crank.
Naw!! Lie to the machine ... set following errors very high. Not nice
but workable.
Software designed to be a DRO is lots cleaner. Too bad the Mauch/
Kaluga boards have disappeared.
Dave
>
> If you want a plain DRO for a manual machine, you'll either need to do
> some programming to make the Qt stuff work without EMC, or you can use
> the HAL+PyVCP approach.
>
> The simplest HAL+PyVCP approach is simply to route the position
> from the
> encoders to PyVCP "number" widgets for display. However, that
> gives you
> the raw position. Wherever the axis was when you powered up will
> be zero,
> and you can't change that.
>
> A nicer DRO has a "zero" button (either one for each axis, or one that
> controls all three axes). When you push it, the display is zeroed and
> all subsequent measurements are made from that point. That is
> quite easy
> to do in HAL. Use a sample/hold block to capture the present
> position,
> and subtract the captured position from the live position for display.
> HAL doesn't have a sample/hold block (yet), but the mux2 block works
> as a sample/hold if you feed its output back to one of its inputs.
>
> I've attached a pair of files, pyvcp-dro.xml and pyvcp-dro.hal, which
> (should) implement a 3 axis DRO with one "zero" button for each axis.
> I say "should" because I'm away from my Linux box and can't test it.
>
> To use, you need CVS HEAD (that's the only version with PyVCP at the
> moment). Put the attached files in the top level directory of the
> checkout, open a shell, and run:
>
> scripts/halrun -I pyvcp-dro.hal
>
> To quit, type "exit" at the halcmd prompt.
>
> Regards,
>
> John Kasunich
>
>
>
>
>
>
> <pyvcp-dro.hal>
> <pyvcp-dro.xml>
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