On Tue, Feb 03, 2009 at 07:13:38PM +0100, Peter blodow wrote:
> I hesitate to call stepconf for investigating because I'm afraid my
> changes will be overwritten and I have to do them all anew. Besides:
> is there a way to preserve my changes from stepconf?

You're right, you shouldn't do this, and it will erase all your changes.

Basically, the BASE_PERIOD defines the maximum step rate, because
(outside of 'doublestep' mode, which you've disabled to get long step
pulses) it takes at least 2*BASE_PERIOD ns to perform one step.

To get the maximum possible step rate, decrease BASE_PERIOD.  You will
get the highest possible step rate when BASE_PERIOD is at least as big
as 50000, your step length and space.  There will always be a small
difference between the BASE_PERIOD you request and the one you get --
while emc is running, you can see what you got with 'halcmd show thread'
in a terminal.

On my system, BASE_PERIOD=50286 was the best value, because smaller
numbers gave an actual period of 49448ns or below.

With BASE_PERIOD=50286, your maximum step rate will be 9.9431253kHz.

Jeff

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