A couple ounces of glenlivet will help you go to sleep. You are welcome 😁 Stuart
On Mon, Jul 13, 2020, 12:14 PM Ralph Stirling <ralph.stirl...@wallawalla.edu> wrote: > In an ideal world, where Peter has infinite amounts > of time and interest, the entire hal ecosystem could > be put on the fpga. Practically, though, it is tricky to > figure out exactly where the line should be drawn > between servo thread modules running in the main > processor and "base thread" components that run in > the fpga. The fpga is parallel logic, so is well suited > to encoder counters, pwm generators, and step > generators. Motion planning would be a nightmare. > Offset generation is in-between, as you need to > connect different (arbitrary) axes, with different > scaling factors. Similar to electronic gearing, but > with offset as a real-time input. The fpga component > would need to combine the "input" axis feedback, > the "output" axis value, and a source for the cam > profile (lookup table). Size of the lookup table would > be an issue, as well as loading it. Specifying the > profile as an equation would reduce the memory > requirements, but would be arbitrarily complex. > Perhaps a 3rd order polynomial would suffice. I'm > sure Peter would love to implement that as well. > > This would make a great EE senior project if I had > lots of great students falling all over themselves > to grab my project ideas. > > -- Ralph > ________________________________________ > From: Gene Heskett [ghesk...@shentel.net] > Sent: Monday, July 13, 2020 9:33 AM > To: emc-users@lists.sourceforge.net > Subject: Re: [Emc-users] Because the hardware store was 4 miles away... > > > On Monday 13 July 2020 12:00:19 Peter C. Wallace wrote: > > > On Mon, 13 Jul 2020, Ralph Stirling wrote: > > > Date: Mon, 13 Jul 2020 13:15:27 +0000 > > > From: Ralph Stirling <ralph.stirl...@wallawalla.edu> > > > Reply-To: "Enhanced Machine Controller (EMC)" > > > <emc-users@lists.sourceforge.net> > > > To: "Enhanced Machine Controller (EMC)" > > > <emc-users@lists.sourceforge.net> Subject: Re: [Emc-users] Because > > > the hardware store was 4 miles away... > > > > > > Perhaps Peter could write a hostmot2 axis offset module that would > > > run in the fpga. No base thread needed. > > > > > > -- Ralph > > > > Oh No, thats definately the wrong design path, the philosophy here is > > to push all the hard work into someone elses domain... :-) > > ROTFLMAO, Peter see's right thru us. ;-) But seriously, the FPGA does > seem like the ideal place for such a module. On chip com with the chosen > stepgenerator removes that particular bandwidth limit. I could also see > it doubleing the size of the FPGA needed so its not going to be free. I > think, not knowing the first thing about writing FPGA code. :-( > > [...] > > Cheers, Gene Heskett > -- > "There are four boxes to be used in defense of liberty: > soap, ballot, jury, and ammo. Please use in that order." > -Ed Howdershelt (Author) > If we desire respect for the law, we must first make the law respectable. > - Louis D. Brandeis > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
