> On 29 Apr 2020, at 12:34 pm, John Dammeyer <[email protected]> wrote:
>
>
>
>> -----Original Message-----
>> From: Peter C. Wallace [mailto:[email protected]]
>>>> double step on this page may do that
>>>> <http://linuxcnc.org/docs/2.8/html/hal/parallel-port.html
>>>> <http://linuxcnc.org/docs/2.8/html/hal/parallel-port.html>>
>>>
>>> Nope. From the doc. "What is the maximum step rate? Remember, two periods
>>> to
>>> make a step. You settled on 16uS for the period, so a step takes 32uS. That
>>> works out to a not bad 31,250 steps per second."
>
>
>>> The clue in that bit of text is the step len and step hold times are not
>>> nanoseconds but BASE_PERIOD events. So my original thoughts are still
>>> correct. The BASE_PERIOD is chosen to create the fastest possible step rate
>>> within reason taking into account latency.
>>>
>>> Now the source code makes more sense. Was a bit confusing thinking the
>>> steplen was nanoseconds.
>>>
>>
>> The steplen _is_ specified in nanoseconds, and you can generate 1 step per
>> base
>> thread invocation by using the double step mode (reset mode)
>>
>> This is described in the hal_parport manual
>>
>>
> I couldn't find that reset mode in the hal_parport. At least not how you
> could have a step that lasted 5uS when the base period was 35uS. How's that
> timing calculated?
setp parport.0.reset-time 5000
In the doc I linked earlier
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