On Fri, 23 Oct 2009, Chris Radek wrote: > Date: Fri, 23 Oct 2009 14:15:01 -0500 > From: Chris Radek <ch...@timeguy.com> > Reply-To: "Enhanced Machine Controller (EMC)" > <emc-users@lists.sourceforge.net> > To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> > Subject: Re: [Emc-users] threading Z oscillation depends on encoder PPR > > On Fri, Oct 23, 2009 at 11:33:15AM -0700, Peter C. Wallace wrote: > >> Its still is a quadrature decoder but it only counts on one edge (rising edge >> of A in this case, state of B on rising edge of A determines direction) > > If this is true, it is not a correct decoding. > > Imagine B is high, and A goes high/low/high/low/high/low > > correct decoding is +1, -1, +1, -1, ... > > The scheme you suggest gives an incorrect +1, +1, +1, ... >
Well, its what I would call an up/down counter but EMC uses that name to describe a counter with count-up and count-down inputs. Its the input side of a step/direction count source. You are correct that it will not correctly count position on reversals so I was wrong to call it a X1 quadarture counter... It should however be fine for threading. A true X1 counter would be easy to arrange but would have to be another counter mode > > ------------------------------------------------------------------------------ > Come build with us! The BlackBerry(R) Developer Conference in SF, CA > is the only developer event you need to attend this year. Jumpstart your > developing skills, take BlackBerry mobile applications to market and stay > ahead of the curve. Join us from November 9 - 12, 2009. Register now! > http://p.sf.net/sfu/devconference > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > Peter Wallace Mesa Electronics (\__/) (='.'=) This is Bunny. Copy and paste bunny into your (")_(") signature to help him gain world domination. ------------------------------------------------------------------------------ Come build with us! The BlackBerry(R) Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9 - 12, 2009. Register now! http://p.sf.net/sfu/devconference _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
