hi again, Am 26.02.19 um 16:15 schrieb TJoseph Powderly: > very interesting > i use RPi3B with LinuxCNC and rt-preempt, headless over wired ethernet
thanks for this feedback! I know, that it is possible to run linuxCNC on raspi itself. I build one some years ago (http://erste.de/cerec1.avi) I did it just for fun - but it works ;-) and with a working eth-connection, it should be no problem, to increase the number of ports. the bottleneck is the max. number of packets which can be sent (and read) by the rt-kernel(s). possible payload of this driver are over 300 IO-pins without any changes in the timing behavior. because a raspberry or arduino is able to detect a rising and falling edge, it is not necessary to waste a full square-wave for each motor step. and again to the other posters: I know, that several mesa-cards available. tey may be fine... but I do not have one. and linuxCNC works with a raspberry (or arduino) also - why not publish a driver for it? maybe, linuxCNC wins some new users in this way... but to use an edge-driven IO seems to be impossible without touching stepgen.c (or wasting eth-bandwidth for obsolete squares) regards wicki _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
