Jeff Epler wrote: > [thread moved to emc-developers] > On Thu, Aug 14, 2008 at 09:17:31AM -0600, Sebastian Kuzminsky wrote: >> Peter suggested a fix for the 5i20 stepgen problem. I've implemented >> it, but I dont have access to the machine with my test hardware so this >> is basically untested. It compiles... >> >> If someone wants to try it out before I test it tonight, it's available >> here (http or bzr): >> >> <http://highlab.com/~seb/bzr/emc2/5i20-stepgen-fix> >> >> This is against CVS TRUNK, though the change should work identically on >> 2.2.6. The only change is in src/hal/drivers/mesa-hostmot2/stepgen.c. > > This does allow the step generator to move, but it behaves oddly. Here > are the links to the two halscope screenshots I sent earlier on irc: > http://emergent.unpy.net/files/sandbox/hm2-step-scoped.png > http://emergent.unpy.net/files/sandbox/hm2-step-scoped2.png > > Jeff
I'm just guessing based on the regular stepgen, so this may be totally wrong. Eric's earlier observation that the mesa stepgen doesn't export a max-accel pin surprised me, because the "position loops" built into stepgen _need_ an accel limit to do their math. I don't know if Seb implemented position mode the same way that stepgen does it (it would be nice if he did). But the velocity strangeness in your second scope pic seems like something that could happen if the accel limit was way off (or missing). Regards, John Kasunich ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
