Re: [Machinekit] Re: Configuring a 10Khz charge pump for a G540 gecko using BeagleBone Black running machinekit

2018-03-23 Thread Tom M 
Bart Dring had created a cape called a Rosetta Bone which could use either
a grbl shield, a parallel port or a ramps shield..  Bart had gifted me a
blank board which worked fine for the parallel port, but had some issues
with the ramps..  so the cape never really got into production.

I noticed that Alex has created a cape for a parallel port that you can get
from OSH park.  Thisprobably would work.
https://github.com/machinekoder/bb-parallel-port-cape

On Fri, Mar 23, 2018, 4:01 PM mrarmyant  wrote:

> How did you get the G540 to work with the bbb?  Been looking all over the
> place on how to get a parallel port out of it.
>
> On Wednesday, February 1, 2017 at 12:10:49 AM UTC-6, Tom M wrote:
>>
>>
>> We almost almost finished configuring our cnc build at the makerspace I
>> belong to.
>>
>> Since the G540 has a charge pump, we thought we would take advantage of
>> it.
>> (We we're debating if we even need to since we don't think the bbb has
>> the start issues that a pc parallel port does.
>>
>> My understanding is that the G540 needs a charge pump frequency of 10Khz
>>
>> It seems that config files that we started with was only setup with a
>> 500hz servo-thread
>>
>> I suspect the servo thread is setup within the calls made at this line..
>>
>> https://github.com/Workshop88/machinekit/blob/OptimizePru/configs/ARM/BeagleBone/RosettaBoneGecko/RosettaBoneGecko.hal#L43
>> )
>> Is this correct?
>>
>> We tried setting up a 10Khz thread here:
>> https://github.com/Workshop88/machinekit/blob/OptimizePru/configs/ARM/BeagleBone/RosettaBoneGecko/RosettaBoneGecko.hal#L31
>> When we put a scope on the charge pump signal it was very erratic and the
>> gecko faulted.  (I was fine when it was on the servo thread but too slow)
>> (When we had the charge pump hooked to the 500Hz servo thread we got a
>> very nice signal.
>>
>> Are there any technical issues regarding the BBB that I'm not taking
>> account?
>> Thanks,
>> Tom
>>
>>
>> http://wiki.linuxcnc.org/cgi-bin/wiki.pl?About_Charge_Pumps
>>
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[Machinekit] Re: Configuring a 10Khz charge pump for a G540 gecko using BeagleBone Black running machinekit

2018-03-23 Thread mrarmyant 
How did you get the G540 to work with the bbb?  Been looking all over the 
place on how to get a parallel port out of it.

On Wednesday, February 1, 2017 at 12:10:49 AM UTC-6, Tom M wrote:
>
>
> We almost almost finished configuring our cnc build at the makerspace I 
> belong to.
>
> Since the G540 has a charge pump, we thought we would take advantage of it.
> (We we're debating if we even need to since we don't think the bbb has the 
> start issues that a pc parallel port does.
>
> My understanding is that the G540 needs a charge pump frequency of 10Khz
>
> It seems that config files that we started with was only setup with a 
> 500hz servo-thread 
>
> I suspect the servo thread is setup within the calls made at this line..
>
> https://github.com/Workshop88/machinekit/blob/OptimizePru/configs/ARM/BeagleBone/RosettaBoneGecko/RosettaBoneGecko.hal#L43
> )
> Is this correct?
>
> We tried setting up a 10Khz thread here: 
> https://github.com/Workshop88/machinekit/blob/OptimizePru/configs/ARM/BeagleBone/RosettaBoneGecko/RosettaBoneGecko.hal#L31
> When we put a scope on the charge pump signal it was very erratic and the 
> gecko faulted.  (I was fine when it was on the servo thread but too slow)
> (When we had the charge pump hooked to the 500Hz servo thread we got a 
> very nice signal.
>
> Are there any technical issues regarding the BBB that I'm not taking  
> account?
> Thanks,
> Tom
>
>
> http://wiki.linuxcnc.org/cgi-bin/wiki.pl?About_Charge_Pumps
>

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