Than found something about CALIBRATING STEPPER with microsteps but couldn't understand code clearly.
Micro steps are something that is a property of the motor's driver. They divide a step into 2, 4, 8, or 16 ( sometimes more ) steps. But when the motor is powered down you loose any fractional step and the motor reverts to the normal steps. However in your case as your required angle is a whole number of steps there should be no need for it.
Half stepping is described here:-
http://www.thebox.myzen.co.uk/Workshop/Motors_3.html
Have you made sure your motor is one that has 200 steps per revolution?
The other stuff simply moves the motor until a hall sensor detects a magnet. This gives you a fixed point of reference when you power up. However it could be used to calibrate every revolution. You could even put a magnet on every position and just pulse until your sensor sees the magnet.
