Control single stepper motor without library

DRV8825_stepper_motor.ino

const int dirPin = 8;
const int stepPin = 9;
const int enablePin = 7;

void setup() {
  pinMode(enablePin, OUTPUT);
  pinMode(stepPin, OUTPUT);
  pinMode(dirPin, OUTPUT);

  digitalWrite(enablePin, LOW);
}

void loop() {
  const int steps = 2000;
  const int delayMicros = 500;
  const int delayMillis = 1000;

  digitalWrite(dirPin, HIGH);
  for (int i = 0; i < steps; i++) {
    digitalWrite(stepPin, HIGH);
    delayMicroseconds(delayMicros);
    digitalWrite(stepPin, LOW);
    delayMicroseconds(delayMicros);
  }
  delay(delayMillis);

  digitalWrite(dirPin, LOW);
  for (int i = 0; i < steps; i++) {
    digitalWrite(stepPin, HIGH);
    delayMicroseconds(delayMicros);
    digitalWrite(stepPin, LOW);
    delayMicroseconds(delayMicros);
  }
  delay(delayMillis);
}