On Sun, 20 Jan 2008, Anders Wallin wrote: > Date: Sun, 20 Jan 2008 10:43:07 +0200 > From: Anders Wallin <[EMAIL PROTECTED]> > 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] Analog to PWM or pulse-train ? > >> A simple Voltage to frequency converter would probably do, for example the >> AD654 in 8 pin DIP is probably quite a better than required. (500KHz max >> frequency, .03% linearity) >> I would count the frequency with one of the spare encoder counters (set up >> for >> up/down mode) and use count difference accumulated over some number of sample >> periods (to average out the sample period jitter) > > I am using the Hostmot-4 config which can provide 50 kHz PWM output. > Can up/down encoder counter mode be specified from the EMC driver? Or > are some VHDL changes needed? > I assume I would connect the AD654 to an encoder A-channel and just > ground the B-channel ? > > AW >
Yes, its in all HOSTMOT configurations but you must somehow set bit 10 of the CCR to enable UP/DOWN = 1X mode. In 1X mode A = Clk and B = Dir. B high means count. > > ------------------------------------------------------------------------- > This SF.net email is sponsored by: Microsoft > Defy all challenges. Microsoft(R) Visual Studio 2008. > http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ > _______________________________________________ > 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.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
