On Tue, Oct 02, 2007 at 02:20:26PM -0500, Sam Sokolik wrote:
> the only other thing I can think of is that the max step/sec is a bit on the
> low side. But I don't know a good safe step rate to put on paper. (~20k/s
> w/Parport) - expecially because 2.2 will have doublefreq which will increase
> the step rate a bit more.
A ~108kHz square wave on a standard PC parallel port, produced by emc
"TRUNK" and captured on a scope:
http://emergent.unpy.net/index.cgi-files/sandbox/img_7714-medium.jpg
the scope measured the period as 9.182uS (but this figure varied as the
scope ran); the pc says the period should be 9.219uS.
This was not a "full" emc; it was the simplest hal configuration that
will toggle an output pin at high rate:
loadrt threads name1=fast period1=10000 fp1=0
loadrt hal_parport cfg=0x378
addf parport.0.write fast
addf parport.0.reset fast
setp parport.0.pin-02-out 1
setp parport.0.pin-02-out-reset 1
start
Jeff
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