> > >>> Anyone can suggest hot to utilize raspberry pi3 for linuxcnc? > > >> > > >> Yes it works. > > >> I've made a sd-image for the raspi2 and it works without any > > >> changes on the raspi3. > > >> With a mesa 7i90 card over spi. > > >> Although only in testing environment but it works. :) > > > > > > What kind of latency do you see? > > > > With glxgears see attachment. > > That isn't too good. With software stepping, steppers would run, but > seem to stall easily as the requested speeds rose.
I have not read or tested myself how much of an issue jitter on step pulses are. I expect at least some reduced performance and increased noise. I made stepper generator by use of timers on micro controller. They are almost perfect now but there is some jitter around servo thread period since only integer value of pulses are possible and they are evenly spaced. If running stepper at constant speed at for example 2.7 times the servo period will produce a signal with quite a lot of jitter. I have however tested to use decimal point to place flank within servo period and then signal generation get perfect to within accuracy of the timer clock. It is not very hard to add decimal point or in practice cost anything extra so this is certainly the preferred path. Interpolation with decimal is of general use and should work equally well for position control with servos. Why do I bother. Because then I now signal generation is perfect even though it may not matter. Nicklas Karlsson ------------------------------------------------------------------------------ Mobile security can be enabling, not merely restricting. Employees who bring their own devices (BYOD) to work are irked by the imposition of MDM restrictions. Mobile Device Manager Plus allows you to control only the apps on BYO-devices by containerizing them, leaving personal data untouched! https://ad.doubleclick.net/ddm/clk/304595813;131938128;j _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
