hi Paul:
yes we do plan to provide access to jtag pins of the fpga. the code in fpga is
not open source, though. but you can install your own code.
Mario:
the board will look like servo device to emc as it will feedback the
pulse-counter as the actual position.
as far as cal. lookup table, it seems like you need encoder feedback so you can
avoid table lookup. is this a normal thing with stepper drivers that they sag?
If a table lookup is really needed, it can supported in the driver code.
since we are targetting this board for emc, what can be better than the emc
mailing list.
regards,
Anton B.
www.vitalsystem.com
----- Original Message ----
From: Mario. <[EMAIL PROTECTED]>
To: EMC developers <emc-developers@lists.sourceforge.net>
Sent: Wednesday, December 19, 2007 12:21:52 PM
Subject: Re: [Emc-developers] Stepper Controller
It would be nice if you also implemented a callibration table, as my
microstepping unit is able of extreme amounts of microsteps, but they
are not exact, so that you could run one axis at a time at various
speeds and remember what the sagging behind the assumed position was
and compensate for that.
Ideal controller would be one which would be a servo drive, so that
the EMC would only command position and controller would catch /do
whatever necessary to be in that position in time specified etc..
Why don't you make a mail-list where you would send mail to people
interested as you make changes to the project.
On Dec 19, 2007 8:02 PM, Anton Buzinski <[EMAIL PROTECTED]> wrote:
>
>
>
> hi Mario,
>
> we are hoping to have the pci board in beta testing in the next couple of
> months. will know the pricing then. keep in touch as we will be looking for
> potential beta testers.
>
> thank you
> Anton
>
>
>
>
>
>
>
> ----- Original Message ----
> From: Mario. <[EMAIL PROTECTED]>
> To: EMC developers <emc-developers@lists.sourceforge.net>
> Sent: Wednesday, December 19, 2007 11:45:29 AM
> Subject: Re: [Emc-developers] Stepper Controller
>
> Currently the step resolution and encoder resolution are independent (but
> stepper use with encoder is not that used much).
> When you are going to make the board, could you please post the pricing and
> availability too? The other guy who made similar board for PCI (USB is
> useless due to unpredictable latencies) was not able to post about pricing or
> sale for months after the announcement that they have it ready :(.
>
>
> On Dec 19, 2007 7:41 PM, Anton Buzinski <[EMAIL PROTECTED]> wrote:
>
> >
> >
> >
> > hello EMC team,
> >
> > we are working on a stepper controller board in pci and usb format that
> > will provide high step rates (upto 5mhz or so). we are trying to figure
> > out how the driver might work. could you tell us what api or global
> > variables we can use to findout the axis command position for the current
> > cycle and the configured number of pulses per unit?
> >
> > if we use an encoder interface for feedback to emc (instead of just a step
> > pulse counter), the encoder resolution may or may not match the motor steps
> > per rev. how do we deal with this discrepency? will emc allow user to
> > enter both encoder resolution as well as motor step resolution?
> >
> > thank you
> > Anton B.
> > www.vitalsystem.com
> >
> >
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