> -----Original Message-----
> From: Peter C. Wallace [mailto:p...@mesanet.com]
> Sent: April-09-21 10:59 AM
> To: Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] Small PC for use with 7i90 / 7i96?
>
> On Fri, 9 Apr 2021, John Dammeyer wrote:
>
> > Date: Fri, 9 Apr 2021 10:34:30 -0700
> > From: John Dammeyer < <mailto:jo...@autoartisans.com>
> > jo...@autoartisans.com>
> > Reply-To: "Enhanced Machine Controller (EMC)"
> > < <mailto:emc-users@lists.sourceforge.net>
> > emc-users@lists.sourceforge.net>
> > To: "'Enhanced Machine Controller (EMC)'" <
> > <mailto:emc-users@lists.sourceforge.net> emc-users@lists.sourceforge.net>
> > Subject: Re: [Emc-users] Small PC for use with 7i90 / 7i96?
> >
> >> From: andy pugh [ <mailto:bodge...@gmail.com> mailto:bodge...@gmail.com]
> >
> > On Fri, 9 Apr 2021 at 17:40, John Dammeyer <
> > <mailto:jo...@autoartisans.com> jo...@autoartisans.com> wrote:
> >
> > > Your photo of the 7I80 is clearer than the one on the MESA site. But I
> > > can't figure out what the difference is between the 7I80DB-
> 16
> > and -25. Which one do you have and why?
> >
> > It's a "16" as it has a 16 k-gate Startan 6 FPGA. The "25" has 25 k-gates.
> >
> > You can fit a bigger, more complicated, firmware on the 25k one. I am
> > not sure if any 7i80 firmwares need the 25kgates.
> >
> > I have the one that I have because that's the one PCW gave me as a
> > development sample ;-)
> >
> >Ah! Now that makes sense. Possibly the larger could be used to allow a
> >non-firmware reprogramming to allow step/dir _or_ pwm/dir on the same two
> >pins.
> >Right now my MESA 7I92H can't do that while an Ethernet Smooth Stepper with
> >MACH can.
> >
> >But that's an apples and oranges comparison from what I understand because of
> >what happens inside the FPGA on both.
> >
> >John
>
> You could do this in hal either by using the stepgen as a PDM generator
> (assuming the PWM is just filtered to obtain a analog voltage)
> or disabling the stepgen and using software PWM (low PWM frequency only)
Thanks for the idea Peter,
In this case it's one of those really cheap 0-10V modules from China. So IIRC,
it's a 1kHz PWM. I'm only able to get 240 Hz at the low end.
How do I set up a software PWM verses step/gen? The adaptor board I built
takes the same two pins and routes it out as step/gen and PWM into the little
module. The Bergerda Servo drive is where a parameter is selected for one or
the other since I bring the analog and the step/gen into the drive.
DB-25 for step/dir/select/fault and a small green 2 pin connector for 0-10V
from the module stacked on top. The connection to the Break Out Board is just
those 4 pins.
John
> Peter Wallace
> Mesa Electronics
>
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