Re: [Emc-users] Printrboard and LinuxCNC

[Dave C. <lin...@gm...>]

The original Smooth Stepper also suffered from USB issues which seemed 
to be related to grounding or isolation issues??

Steve probably knows a lot more about that than I do.

The later designed, Ethernet Smooth Stepper device does not seem to 
exhibit similar issues.

Dave



On 2/28/2014 10:32 AM, Steve Stallings wrote:
> Andy's description of the Mach external pulser API
> is correct.
>
> The device driver gets to select the length of the
> buffer and also select a "pulses per time slice"
> or a way-point version of the data.
>
> USB under Windows seems to require at least 1 second
> of buffered data to be workable. Not pleasant, but
> lots of people use it anyway. USB itself is not the
> problem, it is the Windows protocol stack that can
> cause significant delays. It is optimized for throughput
> not minimum latency.
>
> E-Stop, limits, homing, probing, and threading are the
> responsibility of the device and its driver. This results
> in lots of complicated code in the driver and significant
> variations in performance from one type of device to another.
>
> Steve Stallings
>
>
>   
>
>> -----Original Message-----
>> From: andy pugh [mailto:bod...@gm...]
>> Sent: Friday, February 28, 2014 8:52 AM
>> To: Enhanced Machine Controller (EMC)
>> Subject: Re: [Emc-users] Printrboard and LinuxCNC
>>
>> On 28 February 2014 13:36, Michael Haberler
>> <ma...@ma...> wrote:
>>
>>>> The question, then, is how come Mach3 can have USB
>> cabling, but LinuxCNC
>>>> can't? (see the KX* mills from Arc Eurotrade in the UK;
>> now with USB input)
>>> I have no idea about that API uses over USB, but I'd be curious
>> There is a clue on page 26 here:
>> http://www.warp9td.com/documentation/SmoothStepperUserManualV1.0.pdf
>>
>> It looks like the SmoothStepper accepts 1kHz position data, rather
>> similarly to the Mesa and Pico boards. The difference seems to be a
>> buffer of around 1 second.
>> I assume that e-stop (at least) is handled on-board. I rather assume
>> that limit switches and homing need to be too.
>>
>> -- 
>> atp
>> If you can't fix it, you don't own it.
>> http://www.ifixit.com/Manifesto
>>
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