The code does not allow to modify the pins used for limits (and control)

[mstrens]

Pins used for detecting limits on X,YZ trigger interrupts. The interrupts are linked to a specific NVIC_IRQChannel (EXTI15_10_IRQn ).
So all 3 pins have to be in the range 10 to 15.

This should be at least documented in cpu_map.h.

A similar issue exists for pins used for controls (range must be 5 to 9).

I found this issue when I had to redefine the pins used for step/dir/enable because I had to use 5 volt compliant pins for the stepper drivers I am using .

[robomechs]

see #17