> Changing track, again, the charge pump signal may not be the best thing > to use, because all it would take is noise on the line to mimic the > pump. I think I should make some sort of data pump component, such as > send out a byte every servo period, then have the watchdog watcher check > for the proper byte. This changes the form of the link between EMC2 and > the watcher, and maybe the parameter setting requirements, or lack > thereof. This reminds me of a previous project I was considering, but > forgot about, which is to use a data stream to fail-safe limit > switches. > > I have more thinking to do, carry on. > -- > Kirk Wallace > http://www.wallacecompany.com/machine_shop/ > http://www.wallacecompany.com/E45/index.html > California, USA
Maybe a simple watchdog that avoids the noise trigger issue would be a DPLL that locks onto the chargepump signal. Once locked it enables its output and stops rate tracking. Any subsequent variation in rate (beyond some margin) would trigger a watchdog bite. If run from the servo loop this rate tolerance could be quite small so at 1 mS servo thread, the watchdog could bite at 1.1 ms(and .9 mS). This also does not require any watchdog timeout setting jumpers etc. > > > ------------------------------------------------------------------------------ > What happens now with your Lotus Notes apps - do you make another costly > upgrade, or settle for being marooned without product support? Time to move > off Lotus Notes and onto the cloud with Force.com, apps are easier to build, > use, and manage than apps on traditional platforms. Sign up for the Lotus > Notes Migration Kit to learn more. http://p.sf.net/sfu/salesforce-d2d > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > Peter Wallace Mesa Electronics (\__/) (='.'=) This is Bunny. Copy and paste bunny into your (")_(") signature to help him gain world domination. ------------------------------------------------------------------------------ What happens now with your Lotus Notes apps - do you make another costly upgrade, or settle for being marooned without product support? Time to move off Lotus Notes and onto the cloud with Force.com, apps are easier to build, use, and manage than apps on traditional platforms. Sign up for the Lotus Notes Migration Kit to learn more. http://p.sf.net/sfu/salesforce-d2d _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
