OK, now I think I'm starting to wrap my head around why it is not working. Even with my software encoder sampling on the base-thread, with this line:
addf hm2_5i23.0.read servo-thread updated I/O values were only being read from the 5i23 on the servo-thread. A bit counter intuitive to me, but clear in hindsight. I presume I could remedy this by running the hm2_5i23.0.read function on the base-thread. Peter: I know you have advised against this approach as inefficient use of the PC's CPU, but presuming it is workable performance-wise, is there any functional reason I should not do this? Would I also want to do it for hm2_5i23.0.write or is there no need? Thanks much, Scott On Sat, Mar 17, 2012 at 10:55 AM, Peter C. Wallace <p...@mesanet.com> wrote: > On Sat, 17 Mar 2012, Scott Hasse wrote: > > > Date: Sat, 17 Mar 2012 10:43:56 -0500 > > From: Scott Hasse <scott.ha...@gmail.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] Voltage to frequency for analog input > > > >> But this is really really wasteful > > > > Presuming my PC can handle a reasonable base-thread rate, is it really > > wasteful of a scarce resource? > > Depending on the thread rate, you may use 20% or more of your PCs > horsepower > doing I/O. Also the hardware encoder counter will do a better job of > frequency > counting, even high res counting of low frequencies (it uses a 1MHz > timestamp > for inverse time frequency calculation) than the software encoder counter > (which uses the jittery basethread for timestamping). > > > > > > It seems if I want to use a "real" encoder counter given my configuration > > I'll need a custom 5i23 firmware? > > Possible but since you only need one more encoder counter, theres possibly > a > bitfile that will do (depending on what other functions you have) > > > > > Thanks! > > > > Scott > > > > On Sat, Mar 17, 2012 at 10:01 AM, Peter C. Wallace <p...@mesanet.com> > wrote: > > > >> On Sat, 17 Mar 2012, Scott Hasse wrote: > >> > snip---------------------------------------------------------------------- > >>> > >>> It acts like it is sampling the encoder at the servo-thread frequency, > >>> despite the update-counters function being bound to the base-thread. > >> When > >>> I view the configuration from axis, the base-thread does show the > >>> encoder.update-counters > >>> function bound to it. > >> > >> > >> You probably are sampling at the servo thread, to avoid this you would > >> have to > >> do the the hm2_read at the base thread. > >> > >> But this is really really wasteful, much better to use a real encoder > >> counter > >> (and dump the base thread sucking computer resources altogether) > >> > >> Peter Wallace > >> > >> > >> > >> > ------------------------------------------------------------------------------ > >> This SF email is sponsosred by: > >> Try Windows Azure free for 90 days Click Here > >> http://p.sf.net/sfu/sfd2d-msazure > >> _______________________________________________ > >> Emc-users mailing list > >> Emc-users@lists.sourceforge.net > >> https://lists.sourceforge.net/lists/listinfo/emc-users > >> > > > ------------------------------------------------------------------------------ > > This SF email is sponsosred by: > > Try Windows Azure free for 90 days Click Here > > http://p.sf.net/sfu/sfd2d-msazure > > _______________________________________________ > > 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. > > > > ------------------------------------------------------------------------------ > This SF email is sponsosred by: > Try Windows Azure free for 90 days Click Here > http://p.sf.net/sfu/sfd2d-msazure > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ This SF email is sponsosred by: Try Windows Azure free for 90 days Click Here http://p.sf.net/sfu/sfd2d-msazure _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
