I'm very much at the stepper learning phase ...
Using the L6470 how would you command two or three motors to work in close co-ordination. For example to get motor A to do 612 steps, motor B 476 steps and motor C 211 steps all starting and ending at the same time? (and to forestall smart-alecs, I don't mean that the start time and end time are the same :))
(I think I know how to do this with an A4988).
...R