-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 4/9/2012 6:28 PM, Peter C. Wallace wrote: > On Mon, 9 Apr 2012, Charles Steinkuehler wrote: > >> Date: Mon, 09 Apr 2012 18:21:12 -0500 From: Charles Steinkuehler >> <char...@steinkuehler.net> <snip> > <quote "configs/hm2-stepper/7i43-small.ini"> # Step timing is 40 us > steplen + 40 us stepspace # That gives 80 us step period = 12.5 KHz > step freq # # Bah, even software stepping can handle that, hm2 > doesnt buy you much with # such slow steppers. # </quote> > > Questions: > > 1) Why is the step rate so low on the 7I43? I don't see any > direct reason in the hm2 HDL design, the LinuxCNC software, or the > EPP port limitations that should require this low step rate. What > am I missing? > >> Because the example file is a real example file for a specific >> step drive that just happens to have those timings > >> The actual hardware limitation on steprate is ClockLow/4 (for a >> 7I43 this is 50 MHz/4 = 12.5 MHz)
That makes much more sense. Thanks! - -- Charles Steinkuehler char...@steinkuehler.net -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAk+DdU8ACgkQLywbqEHdNFyBjQCcCFyMyNbzr0Ifgqmu3LL1LTau VSUAn10rYH/c+ba38YkQO6k+d5gF7s4Q =eydd -----END PGP SIGNATURE----- ------------------------------------------------------------------------------ For Developers, A Lot Can Happen In A Second. Boundary is the first to Know...and Tell You. Monitor Your Applications in Ultra-Fine Resolution. Try it FREE! http://p.sf.net/sfu/Boundary-d2dvs2 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
