RE: Homing STG

[Kurtis Martineau <klmartineau-at-shaw.ca>]

Thanks Les,

But newstg seems to work the same and is not stoping on the encoder index
pulse.
There must be something that I am missing here...a hardware
configuration...#define for 4 axis board....?

How fast are you able to come into our home switch?  (I've tried various
rates from a crawl on up) Do you manually jog until you're close and then
home the last inch or so?

Also, is anyone using a slowdown switch to reduce a rapid traverse to a safe
homing velocity, during an axis homing cycle?

Any other comments? ( Paul? )

Kurtis


> -----Original Message-----
> From: emc-at-nist.gov [emc-at-nist.gov]On Behalf Of Les Watts
> Sent: Tuesday, August 27, 2002 7:52 AM
> To: Multiple recipients of list
> Subject: Re: Homing STG
>
>
>
> Hi Kurtis!
>
> Ah yes the homing problem with stg II.
>
> Yes I am getting the homing to work fine with STG II 8 axis,
> but Paul and I had to hack the code a little to get it to work.
> After the stg II came out homing ceased to work.
>
> Specifically When we looked at any of the EMCMOT code
> we could not find anyplace where registers IDLEN (index pulse
> latch enable) at offset 0x409 and SELDI (select index pulse) at
> offset 0x40B were written to. So we wrote all 1's to IDLEN
> to enable all axes index pulses and all 0's to SELDI to select
> index pulse latching rather than external latching (P2 pin 39).
>
> I believe Paul cleaned up this crude fix with something a little
> more structured for the CVS sources but I think you  might
> be the first to test it.
>
> I have continued to run with the original hack as I am familiar
> with c but a linux newbie so am reluctant to recompile stuff and
> the hack works perfectly fine.
>
>
> He wrote to me about the better fix as follows:
>
> ------------------------------------------------------------------
> ----------
> ------
> "I added the following few lines to newstg.c at line 82 and also to stg2.c
> at
> 1820. I thought it a little cleaner and easier to follow than the
> hack I did
> on your machine.
>
>  /*  Need to set up registers to allow the use of index pulse P.C. */
>   if (MAX_AXES > 4)
>  {
>   bySelectBits = 0xff;
>   } else  {
>   bySelectBits = 0x0f;
>  }
> SelectIndexOrExtLatch(bySelectBits);
> EnableCounterLatchOnIndexOrExt(bySelectBits);
>
> I expect I'll need to add something similar to the old STG driver
> as I hear
> some people are using EMC with the model 1 cards."
> -----------------------------------------------------------------------
>
>
> But if you are using the 4 axis version Matt had the same problem
> a good while ago and I think took it to Will who adapted some
> STG code which compiled to newstgmod.o. If you get this
> I think it will work with the 4 axis board. But it did not for the 8
> axis hence our fix. In any event Paul's new code is for 8 axis as
> well as 4.
>
> Try newstgmod.o. compiled (I think) from newstg.c .Let's see if we can get
> Paul to
>  chime in here about the latest fix ( I think he has been busy)... the
> intention is to have
> one EMCMOT that will work with all stg boards type I or II with any axis
> configuration. In getting you fixed up we can hopefully make that happen.
> It probably IS fixed... just use newstgmod. If folks test this
> with all card
> combinations and it works I suggest we get rid of all the other old stg
> EMCMOT files.
>
> Les
>
> Leslie Watts
> L M Watts Furniture
> Tiger, Georgia USA
> http://www.alltel.net/~leswatts/wattsfurniturewp.html
> engineering page:
> http://www.alltel.net/~leswatts/shop.html
>
> ----- Original Message -----
> From: "Kurtis Martineau" <klmartineau-at-shaw.ca>
> To: "Multiple recipients of list" <emc-at-nist.gov>
> Sent: Monday, August 26, 2002 8:36 PM
> Subject: Homing STG
>
>
> >
> > Has anyone been able to home a STG axis using a home switch and
> an encoder
> > index pulse?
> >
> > I understand that Paul has made some modifications to the
> relevant code,
> > but I still haven't been able to get this to work.
> >
> > I am using the BDI 2-12 and have recently updated the latest
> sources from
> > the SourceForge site using:
> >
> > cvs -d:pserver:anonymous-at-cvs.EMC.sourceforge.net:/cvsroot/emc login
> > cvs -z3 -d:pserver:anonymous-at-cvs.EMC.sourceforge.net:/cvsroot/emc co emc
> > cvs -z3 -d:pserver:anonymous-at-cvs.EMC.sourceforge.net:/cvsroot/emc co
> rcslib
> >
> > I have the following setup:
> > a STG model 2, 4 axis card.
> > EMCMOT= stg2mod.o
> > An encoder that is directly coupled to my motor with A B Z
> channels wired
> > correctly to the STG board.
> > I scope the encoder pulses and there is definitely a 5V pulse
> every rev of
> > the encoder.
> > My setup is tuned and working.
> > If I recompile with the  # define NO_INDEX_PULSE uncommented in
> extstgmot.c,
> > I can home off the home switch only.
> >
> > Any advice?
> >
> > Kurtis
> >
> >
> >
> >
>
>