On Mon, 29 Apr 2013, Gregg Eshelman wrote: > Date: Mon, 29 Apr 2013 01:51:22 -0700 (PDT) > From: Gregg Eshelman <g_ala...@yahoo.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] [utf-8] Beaglebone LinuxCNC starterkit: ready-to-run > SD card image > > --- On Sun, 4/28/13, Peter C. Wallace <p...@mesanet.com> wrote: > >> I dont think the case for servo systems is very good without >> some additional hardware. The BBB has just three possible >> hardware encoder counters. Software encoder counters could >> be done by the PRU but they would not be comparable to >> hardware encoder counters in performance (hardware can do >> MHz count rates and more importantly multi MHZ oversampling >> for digital filtering). Also you lose one hardware encoder >> if you use the on card flash memory and one more if you use >> video. > > What about the network port? Don't use the video and use network for control. > Could you multiplex encoder data to make two work like four, albeit at a > slower rate?
You could multiplex encoder data using a PRU software encoder (If you ran out of pins) but this would 1/2 the software data capture rate. I dont think its possible to mux the hardware encoders. Encoder capture might also be possible with DMA, I havent looked into PRU DMA capabilities yet > > ------------------------------------------------------------------------------ > Try New Relic Now & We'll Send You this Cool Shirt > New Relic is the only SaaS-based application performance monitoring service > that delivers powerful full stack analytics. Optimize and monitor your > browser, app, & servers with just a few lines of code. Try New Relic > and get this awesome Nerd Life shirt! http://p.sf.net/sfu/newrelic_d2d_apr > _______________________________________________ > 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. ------------------------------------------------------------------------------ Try New Relic Now & We'll Send You this Cool Shirt New Relic is the only SaaS-based application performance monitoring service that delivers powerful full stack analytics. Optimize and monitor your browser, app, & servers with just a few lines of code. Try New Relic and get this awesome Nerd Life shirt! http://p.sf.net/sfu/newrelic_d2d_apr _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
