Stepper motor test with Spark Core

#include "AccelStepperSpark/AccelStepperSpark.h"

// Define the steppers/drivers and the step/dir pins used
AccelStepper stepperSmall(AccelStepper::DRIVER, D5, D4);

// Define Microstepping pins
#define MODE0 D0
#define MODE1 D1
#define MODE2 D2

int pos = 1200;

void setup()
{

  /*

  Micrstepping table for the DRV8825
  ----------------------------------

  MODE0  MODE1   MODE2   MICROSTEP RESOLUTION
  =====   =====   =====   ====================
  Low    Low     Low     Full step
  High   Low     Low     Half step
  Low    High    Low     1/4 step
  High   High    Low     1/8 step
  Low    Low     High    1/16 step
  High   Low     High    1/32 step
  Low    High    High    1/32 step
  High   High    High    1/32 step

  */

  pinMode(MODE0, OUTPUT);
  pinMode(MODE1, OUTPUT);
  pinMode(MODE2, OUTPUT);

  digitalWrite(MODE0, LOW);
  digitalWrite(MODE1, LOW);
  digitalWrite(MODE2, LOW);

  stepperSmall.setMaxSpeed(800.0);
  stepperSmall.setAcceleration(200.0);
  stepperSmall.setSpeed(400);

}

void loop()
{
  if (stepperSmall.distanceToGo() == 0)
  {
    delay(500);
    pos = -pos;
    stepperSmall.moveTo(pos);
  }
  stepperSmall.run();
}