Yeah, I know I could hardwire it to work. I would rather not. Especially since the software is capable of doing what I want, at least with other drivers. If I can do it in software, the cabling is much simpler. Thanks for the suggestion, though. On Jul 26, 2014 10:23 PM, "Gene Heskett" <[email protected]> wrote:
> On Saturday 26 July 2014 23:46:50 Russel Ingram did opine > And Gene did reply: > > I'm trying to get a Beaglebone Black with a Xylotex parallel port cape > > to drive a Gecko G540 and everything works fine if I want a plain old > > three axis setup, but my ultimate goal is to have a pair of steppers > > that both take the same step commands but in opposite directions to > > drive opposite ends of the Y axis on the router I'm building. It looks > > pretty simple in the parport hal I had when I had it hooked up to a > > PC, but the PRU hal examples seem a bit less straightforward. Is it > > possible to do this with the PRU driver? > > > I would setup 2 drivers from one stepgen, and reverse a winding on one > motor. That way you don't have to worry about the backwards motor, just > wire it that way and you don't have to putz with the software portion. > > That will of course need a small patch board cut into the parport cable > between the parport and the xylotex so one stepgen is sent to 2 drivers on > the xylotex card. The std cable can't do that. > > I do think I'd not do a final torque up on the motor couplings until I had > let one of them slip enough at driver powerup time so the motors aren't > fighting each other by half a step. At powerup, the xylotex's come up in > a consistent state. If the couplings are then locked down after allowing > that slippage, it should be good till the next time you take it apart. > > There are other ways, and you should use the one that fits your needs > best, this may not be it, its just one way. > > Cheers, Gene Heskett > -- > "There are four boxes to be used in defense of liberty: > soap, ballot, jury, and ammo. Please use in that order." > -Ed Howdershelt (Author) > Genes Web page <http://geneslinuxbox.net:6309/gene> > US V Castleman, SCOTUS, Mar 2014 is grounds for Impeaching SCOTUS > > > ------------------------------------------------------------------------------ > Want fast and easy access to all the code in your enterprise? Index and > search up to 200,000 lines of code with a free copy of Black Duck > Code Sight - the same software that powers the world's largest code > search on Ohloh, the Black Duck Open Hub! Try it now. > http://p.sf.net/sfu/bds > _______________________________________________ > Emc-developers mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-developers > ------------------------------------------------------------------------------ Want fast and easy access to all the code in your enterprise? Index and search up to 200,000 lines of code with a free copy of Black Duck Code Sight - the same software that powers the world's largest code search on Ohloh, the Black Duck Open Hub! Try it now. http://p.sf.net/sfu/bds _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
