Hope this proposition has not been covered elsewhere...
I am to a degree rather rusty and rather out of my depth as I have not done much tinkering since 6502/Z80 days
Anyways, here goes.
The Gertboard has provision for an Atmel '328
There is now a version of EMC2 for the AT328 Arduino
So the proposition is essentially splitting EMC2, the brains & front end/GUI of emc2 on the Pi while the realtime priority IO is done by the AT'328 on the Gertboard. This would allow (could it be done?) the rest of the IO on the Gertboard to look after the low priority non realtime IO for other functions for a workable and flexible CNC - Robotics solution.
Keeps the hardware all RPi/Gertboard.
So that is the concept I have imagineered.
Is this a sane proposition? Or am I well past at my sell by date?
I am not the guy to do this.....