Peter C. Wallace wrote:
> , and I
> believe Pico systems is adding this feature as well.
>
Yes, our UPC board (PWM servo controller) has had the firmware support
for this for several years.
I finally found some time to bang my head around the driver software to
use the timestamp info to perfo
On Sat, 19 Feb 2011, Jon Elson wrote:
> Date: Sat, 19 Feb 2011 14:08:40 -0600
> From: Jon Elson
> Reply-To: "Enhanced Machine Controller (EMC)"
>
> To: "Enhanced Machine Controller (EMC)"
> Subject: Re: [Emc-users] Servo counts
>
> Roland Jolliv
Roland Jollivet wrote:
> I see. And is the time stamp used as an integral part of the EMC
> calculation? Or rather, does the Pluto interface for example, also supply
> the same info?
>
> What I'm also wanting to know is;
> If a system has 4 axis, that's 4 x (4x8) bytes to read per sample (=128
> by
Roland Jollivet wrote:
>
> So what I'm wondering is why do the Mesa cards use 32 bit counters for the
> encoders?
>
> Would a 16bit counter not suffice? It just seems that there is a lot of time
> spent reading redundant numbers from encoders, and that things could be
> simplified with 16 bits.
>
>
Roland Jollivet wrote:
> I see. And is the time stamp used as an integral part of the EMC
> calculation? Or rather, does the Pluto interface for example, also supply
> the same info?
>
> What I'm also wanting to know is;
> If a system has 4 axis, that's 4 x (4x8) bytes to read per sample (=128
> by
Roland Jollivet wrote:
> Hi all
>
> I'm trying to figure something out;
>
> With a servo type system using quadrature feedback, I see that "*the EMC ini
> file uses two variables, FERROR and MIN_FERROR to define acceptable
> following error for each axis. Think of MIN_FERROR as the following error
On Sat, 19 Feb 2011, Roland Jollivet wrote:
> Date: Sat, 19 Feb 2011 14:56:19 +0200
> From: Roland Jollivet
> Reply-To: "Enhanced Machine Controller (EMC)"
>
> To: "Enhanced Machine Controller (EMC)"
> Subject: [Emc-users] Servo counts
>
> I se
On 19 February 2011 12:56, Roland Jollivet wrote:
> Is it practical(for a low cost encoder board) to have only 8bits per
> encoder.
Yes, that would almost certainly work fine, but the EMC2 component
would have to track it with a 64-bit internal counter.
Luckily, by a quirk of signed binary, addi
On 19 February 2011 10:35, Roland Jollivet wrote:
> Surely there is no need to have a 32 bit counter? A 16 bit counter should
> suffice?
Yes and no. The Mesa FPGAs actually use a 16 bit counter, but this is
expanded to 64 bits by the EMC2 drivers, then re-exported to the HAL
pins as 32 bits.
I t
e:
>
> > Date: Sat, 19 Feb 2011 12:35:27 +0200
> > From: Roland Jollivet
> > Reply-To: "Enhanced Machine Controller (EMC)"
> >
> > To: "Enhanced Machine Controller (EMC)" >
> > Subject: [Emc-users] Servo counts
> >
> > Hi
On Sat, 19 Feb 2011, Roland Jollivet wrote:
> Date: Sat, 19 Feb 2011 12:35:27 +0200
> From: Roland Jollivet
> Reply-To: "Enhanced Machine Controller (EMC)"
>
> To: "Enhanced Machine Controller (EMC)"
> Subject: [Emc-users] Servo counts
>
> H
With 32 bit counters, in most cases, you don't have to worry about roll
over at all..
Dealing with roll over issues can be tricky..
Dave
On 2/19/2011 5:35 AM, Roland Jollivet wrote:
> Hi all
>
> I'm trying to figure something out;
>
> With a servo type system using quadrature feedback, I see th
Hi all
I'm trying to figure something out;
With a servo type system using quadrature feedback, I see that "*the EMC ini
file uses two variables, FERROR and MIN_FERROR to define acceptable
following error for each axis. Think of MIN_FERROR as the following error
allowed at very low velocity and FE
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