On Tue, Oct 13, 2009 at 06:48:09AM -0500, Chris Radek wrote: > I think the assumption that there will be no direction change in this > case is not right. I have noticed that the software stepgen will > "prefer" direction set one way while idle and it will always do that. > I think the Mesa stepgen is a similar algorithm. You could verify it > but you would need to use a real scope I guess.
It looks like the "direction" output of the hostmot2 stepgen is simply the sign bit of the step rate. That means that when a zero velocity is requested, the "direction" output will want to always settle to 0. This is in the vhdl, not the software driver. Changing it (for instance, to only change "direction" when steprate is nonzero) would require updated device firmwares. Jeff ------------------------------------------------------------------------------ Come build with us! The BlackBerry(R) Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9 - 12, 2009. Register now! http://p.sf.net/sfu/devconference _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
