On Thu, 26 Sep 2013, Thomas Kaiser wrote: > Date: Thu, 26 Sep 2013 23:33:53 +0200 > From: Thomas Kaiser <c...@kaiser-linux.li> > Reply-To: "Enhanced Machine Controller (EMC)" > <emc-users@lists.sourceforge.net> > To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> > Subject: [Emc-users] Homebrew BOB > > Hello > > I read this page > http://wiki.linuxcnc.org/cgi-bin/wiki.pl?About_Charge_Pumps. > > What is needed to make sure the BOB is only active when LinuxCNC is up, > running and healthy? > > When LinuxCNC is not running, some outputs are in the wrong state. > Therefore, I would like to enable the BOB only when LinuxCNC is running > and out of Emergency Off. > > I use a 5i20 Mesa PCI card with a homebrew BOB. > > Thomas >
You can certainly make a chargepump, but it may be simpler for the BOB to just use the default I/O state of the 5I20 outputs when linuxcnc is not running (pulled up to 5V with 3.3K pullup resistors). Because of this, FPGA outputs should be assumed to be active low. Unlike a parallel port that may be probed by the BIOS at startup so have undefined states, the FPGA pins are defined at startup and after a watchdog bite (they will be pulled high) Peter Wallace Mesa Electronics ------------------------------------------------------------------------------ October Webinars: Code for Performance Free Intel webinars can help you accelerate application performance. Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from the latest Intel processors and coprocessors. See abstracts and register > http://pubads.g.doubleclick.net/gampad/clk?id=60133471&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
