On Wed, 2009-09-16 at 08:28 +0100, Steve Blackmore wrote: > On Tue, 15 Sep 2009 20:24:16 -0500, you wrote: > > >On Tue, 2009-09-15 at 11:06 -0400, Dave wrote: > > >IMO you'd want it to be no more than a pulse wide or the threading may > >start at any of the pulses that the index spans. > > Strange behaviour? - It should start on either the rising or falling > edge, if it starts anywhere else it needs fixing. > > Steve Blackmore
I guess that what I'm saying is that the index pulse does not serve as a software interrupt that says to the computer, "stop everything and run this code." EMC2 is not interrupt driven. It is loop driven. As such it reads machine state every so often and bases its next actions on what it sees. A properly set up system should see both the index pulse and the position pulse during the same position pulse after index changes but it is easily possible to create a system that would not. The rising or falling edge of a single signal is a "red herring" issue except for those specific hardware boards that use hardware interrupts. HTH Rayh ------------------------------------------------------------------------------ Come build with us! The BlackBerry® 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/devconf _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
