On 28 September 2010 23:48, Steve Blackmore <st...@pilotltd.net> wrote:
>
> Is there any documentation for
>
> spindle-rpm-filtered ??

No. It is a signal name, and the next paragraph says "assuming that
spindle-rpm-filtered already exists"

signal names (the first item in a  "net" command) can be freely chosen
and are created as required.

You would need to add the following to the HAL file to create it (and
make it work)

loadrt lowpass count=1
…
…
addf lowpass.0  servo-thread
…
…
setp lowpass.0.gain 0.01
net spindle-rpm-unfiltered => lowpass.0.in
net spindle-rpm-filtered <= lowpass.0.out

The last line creates the spindle-rpm-filtered signal name
the gain value will need to be adjusted to suit.

http://www.linuxcnc.org/docview/html//man/man9/lowpass.9.html

-- 
atp

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