steppermotor only few steps

Projects Programming
14

The for-loop could it be like this?

{
      digitalWrite(dirPin,HIGH); 
      for(int x = 0; x < 200; x++) 
            {
            digitalWrite(stepPin,HIGH); 
            delayMicroseconds(500); 
            digitalWrite(stepPin,LOW); 
            delayMicroseconds(500); 
            }
    }

The StateChangeDetection I found on the pages of Arduino but I can't figure it out how to do it!