is it possible to use raspberry pi and slaved Adafruit Grand Central M4 Express

It been while seance I've looked at switching from flashcuts controller to Linuxcnc , The mcu's out currently for the hobbyist are starting have more power than what is in the flashcut controller . My question can run a raspbery pi and slave a/or some Adafruit Grand Central M4 Express boards? The end goal is to have 3-4 axis close loop servo with gecko 320x drive . I want linuxcnc to control the pid . Am I asking to much out of that class hardware ?

If you mean by closed loop HYBRID stuff with no Return to the Controller YES

if the Servos communicate with the Running controller PC NO

Better to use a REAL PC at 40USD and a Parport BOB at 10USD

you can get up to 2Mio steps while raspberry alows a max of 100k

so for running the encoder loop to linuxcnc I'm better off with a desktop pc then ? A usb parallel port wouldn't work do to timing ?

tony978 wrote:

so for running the encoder loop to linuxcnc I'm better off with a desktop pc then ? A usb parallel port wouldn't work do to timing ?

as fas as I know: no

which latency-time do you need?
last days, I got 125usec. to slow for me

but I think, its a problem of the RT-configuration at both sides
(raspberry & PC).

erste.de/rasPiCat.html

more tests will follow....

I totally scraped the idea . I realized I have to go with a PC for running my a axis as a lathe spindle and to use some of the more advanced features of this software .