Klemen Dovrtel wrote: > Hello everybody, > > I am using fpga to monitor the incremental encoder and transfer the axis > absolute position to pc using parallel port and epp communication. When I run > the Axis GUI I am getting some strange following errors. I found out that > occasionally i get some bad axis position data transfer from the fpga. But > what is very strange that this happens only when the axis moves in negative > direction and never when it moves positive direction or stays still (please > see the image attached)). So i thought there must be some bug in pfga > encoder, not in epp communication, but i have no idea what could possibly be > wrong - the code is very simple (i pasted it below). > > Maybe you should read out the individual bytes of the position report and put them in a file. One possibility is that you are not "freezing" a valid n-byte count before reading out the individual bytes of the count over the EPP port. The Pico Systems boards, and I'll bet the Mesa boards, too, have a holding register that freezes all 24-bit position counts for all axes before reading them a byte at a time. I don't see such a holding register in your VHDL.
That's just one guess as to the cause. Jon ------------------------------------------------------------------------------ Everyone hates slow websites. So do we. Make your web apps faster with AppDynamics Download AppDynamics Lite for free today: http://p.sf.net/sfu/appdyn_d2d_feb _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
