Simple Stepping

#define pinStp 11  //Steps
#define pinDir 12  //Direction
#define pinEna 10  //Enable the driver (LOW = enabled)
#define pinLed 13  //LED pin

#define stepperStepDelay 50    //Delay between each step
#define stepperSteps 20000     //Number of steps to take
#define stepperEnableDelay 25  //Delay from driver is activated until first step is taken

#define cyclePause 500  //Delay between clockwise and counterclockwise movement


void setup()
{
  Serial.begin(9600);
  pinMode(pinDir, OUTPUT);
  pinMode(pinStp, OUTPUT);
  pinMode(pinEna, OUTPUT);
  pinMode(pinLed, OUTPUT);
}

void loop()
{
  while(true)
  {
    digitalWrite(pinEna, LOW); digitalWrite(pinLed, HIGH); delayMicroseconds(stepperEnableDelay);
    digitalWrite(pinDir, LOW);

    for(int i = 0; i < stepperSteps; i++)
    {
      digitalWrite(pinStp, HIGH);
      digitalWrite(pinStp, LOW);
      delayMicroseconds(stepperStepDelay);
    }

    digitalWrite(pinEna, HIGH); digitalWrite(pinLed, LOW);

    delay(cyclePause);

    digitalWrite(pinEna, LOW); digitalWrite(pinLed, HIGH); delayMicroseconds(stepperEnableDelay);
    digitalWrite(pinDir, HIGH);

    for(int i = 0; i < stepperSteps; i++)
    {
      digitalWrite(pinStp, HIGH);
      digitalWrite(pinStp, LOW);
      delayMicroseconds(stepperStepDelay);
    }

    digitalWrite(pinEna, HIGH); digitalWrite(pinLed, LOW);

    delay(cyclePause);
  }
}