On Wed, 25 Jul 2012, Chris Morley wrote:

> Date: Wed, 25 Jul 2012 00:47:48 +0000
> From: Chris Morley <chrisinnana...@hotmail.com>
> Reply-To: "Enhanced Machine Controller (EMC)"
>     <emc-users@lists.sourceforge.net>
> To: EMC <emc-users@lists.sourceforge.net>
> Subject: Re: [Emc-users] xml for G540 and pncconf with 5i25?
> 
>
>
>
>> Date: Tue, 24 Jul 2012 17:28:53 -0500
>> From: sie...@gmail.com
>> To: emc-users@lists.sourceforge.net
>> Subject: [Emc-users] xml for G540 and pncconf with 5i25?
>>
>> I got a G540 so I switched over the 5i25 firmware to the G540x2.  Was there
>> an XML file for use with pncconf?   I did some searching and couldn't come
>> up with anything.  I had used the prob_rfx2 xml with the BOB I had
>> previously.
>>
>> Thanks
>> Bryce
>
> I have not made a XML file for this yet... I thought it had a charge pump 
> component,
> which PNCconf doesn't know about but I can not see that in the PIN file, so I
> should be able to build one the PNCconf can already use... I'll see if I have 
> time tonight.
>
> Chris M

The latest G540 configuration uses a one output stepgen for the chargepump 
due to that rather annoying G540 "feature" that the chargepump needs a
10 KHz frequency which would force the use of a base thread if the bit was 
just GPIO (dont know why 500 Hz would not have done, oh well)

The chargepump stepgens are at the end numerically so dont interfere with 
the G540s stepgen assignment (they are stepgen 8 (P3) and 9 (P2))


There are a couple ways to get a square wave out of the stepgen. One is to set 
the position scale to 10000, set stepgen output mode to quadrature and 
operating mode to velocity and finally set the velocity to .25 (this is .25 
instead of 1 because quadrature mode counts 4x as fast at step/dir mode)



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Peter Wallace
Mesa Electronics

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