On 12/25/2012 8:14 PM, Charles Steinkuehler wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > Happy Holidays! > > Now that the hm2_pci driver works in user-space, and the Christmas > turkey is cooked (and eaten!), I've managed to absorb enough details > to write some code for the BeagleBone PRU and perform some initial > timing tests. > > As things stand now, I expect to be able to implement a > general-purpose PRU solution that can implement step/dir, up/down, pwm > (or delta-sigma modulation), and anything else anyone wants to code up > for all available PRU pins (14 PRU0 pins available on the 'bone) that > can run with a cycle time of around 5 uS or less (ie: 5000 nS base > period with virtually zero latency jitter, in LinuxCNC software > stepgen terms). > > Even better, if you simplify the task, fold common channel control > values together (step length, dir setup/hold, etc), and keep state > data in registers, I think it should be possible to implement a 3D > printer (or generic 4-axis CNC + 2 PWM) in a 1 uS thread. And there > are still dedicated hardware timers and encoder inputs available as well! > > Of course, the proof is in the pudding, so keep an eye out on Michael > Haberler's git repo...I'll commit code there once it does something > useful. > > Oh, and Michael: Thanks for the PRU tools! The "debugger" may be > limited, but it's *WAY* better than nothing! > > - -- > Charles Steinkuehler > Charles:
I'm surprised not to see responses already but maybe everyone else has been as preoccupied as I have been. A BeagleBone arrived here on Monday so I'm all set to sample your tasty "pudding" :-) My 12-year old grandson's favorite word for things that impress him is "epic." I think what you have outlined is epic. If it turns out it's possible only to deliver half as much performance it would be semi-epic, which is still awesome in my book!. Regards, Kent ------------------------------------------------------------------------------ Master Visual Studio, SharePoint, SQL, ASP.NET, C# 2012, HTML5, CSS, MVC, Windows 8 Apps, JavaScript and much more. Keep your skills current with LearnDevNow - 3,200 step-by-step video tutorials by Microsoft MVPs and experts. ON SALE this month only -- learn more at: http://p.sf.net/sfu/learnmore_122712 _______________________________________________ Emc-developers mailing list Emc-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-developers
