On 27 February 2017 at 13:49, Gene Heskett <ghesk...@shentel.net> wrote:
> What I wanted was a binary counter, whose individual bitN outputs could
> drive the selN lines of a mux16, thereby selecting the gain to be
> applied to the jogwheel output.

Mux-generic can be driven by an integer (and, possibly usefully for
you, you can also use the bit-inputs to "shift" the selection.)
http://linuxcnc.org/docs/2.7/html/man/man9/mux_generic.9.html

http://linuxcnc.org/docs/2.7/html/man/man9/updown.9.html
Looks like the solution to the counting up and down part.

One slight inconvenience is that updown is S32 out and mux_generic is U32 in.

-- 
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1916

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