On Tue, Nov 28, 2006 at 07:50:32PM -0500, Ed Nisley wrote: > I attached a digital 'scope to the Z axis step & direction > signals. They're clean digital pulses, good amplitudes, no > noise worth mentioning. The step signal shows the expected > ramping-up and ramping-down frequencies at about the right > rates. > > However, the direction signal misbehaves! > > Erratically, occasionally, but reproduceably (if I'm > patient), the direction signal changes while the step > signal is pulsing. For example, it will change from 1 to 0 > to 1 (high - low - high) while I'm holding down the PgUp > key (not calling for a direction change). The other axis > behave similarly. > > The changes seem to be in the tens-to-hundreds of > millisecond range and generally occur at the leading or > trailing ends of the motion, not in the middle, but that > may just be my observations so far.
Hi Ed, thanks for your excellent troubleshooting and report. Have you also observed these incorrect direction changes on halscope hooked to the parport pins (at the HAL level)? The answer to this will shed a lot of light and nicely partition the problem space (a negative answer will eliminate the vast majority of the EMC2 program). Chris ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
