【求教】步进电机不会用啊

#include <Stepper.h>
const int stepsPerRevolution = 64;
Stepper myStepper(stepsPerRevolution, 8,9);
void setup()
{
myStepper.setSpeed(200);
Serial.begin(9600);
}
void loop() {
myStepper.step(stepsPerRevolution/2);
delay(1000);
}
怎么让步进一直转... 我把最后的delay删了他就不动了..