Hello,
I am designing a CNC controller 3 axis. Someone have experience in interpollation linear and circular with FPGA.
All helps are welcome.
Michel.

hi

as i know, the linux cnc project is doing all the interpolation and control loops inside the pc software and not in fpga hardware, but they provide a really flexible fpga firmware for cnc machines.

it's called hostmot2 and provides a framework of components to be integrated into an fpga. basically they have gpio modules, pwm generators, step/direction generators for stepper motors and encoder input stages. could be helpful for your project.

description:
http://linuxcnc.org/docs/html/drivers_hostmot2.html

firmware download:
http://emergent.unpythonic.net/01272896838