Two-dimension stepper control with potentiometers

[johnwasser]

@beepboopbob

For one of the two axes, the motor runs very slow and changing #define YMAX_DRIVER_PULSE_PERIOD_US doesn't seem to affect it. I'm having trouble understanding why, since the code is the same for each axis.

I don't see any problem in the code. If you change:

#define XPOT_PIN           A0
#define YPOT_PIN           A1

to

#define XPOT_PIN           A1
#define YPOT_PIN           A0

Does the problem move to the X axis? If so, that would indicate a hardware problem with the pot on A1