I wonder if information is available regarding the precise definition of the set Acceleration value.
When changing the stepping from full to 1/n steps - does the defined value refer to full steps or microsteps? I.e., when using '100' for full steps does the value need to change to '400' when using 1/4 step to achieve the same acceleration (rotation/s/s)?
The AccleStepper library does not know whether the stepper driver is doing full steps or microsteps. Acceleration is steps per second per second. If you are using microstepping you will need more steps per second for the same speed.
...R