Stepper Motor Constant Speed

// ConstantSpeed.pde
// -*- mode: C++ -*-
//
// Shows how to run AccelStepper in the simplest,
// fixed speed mode with no accelerations
// Requires the AFMotor library (https://github.com/adafruit/Adafruit-Motor-Shield-library)
// And AccelStepper with AFMotor support (https://github.com/adafruit/AccelStepper)
// Public domain!

#include <AccelStepper.h>
#include <AFMotor.h>

AF_Stepper motor1(200, 2);


// you can change these to DOUBLE or INTERLEAVE or MICROSTEP!
void forwardstep() { 
  motor1.onestep(FORWARD, SINGLE);
}
void backwardstep() { 
  motor1.onestep(BACKWARD, SINGLE);
}

AccelStepper stepper(forwardstep, backwardstep); // use functions to step

void setup()
{ 
   Serial.begin(9600);           // set up Serial library at 9600 bps
   Serial.println("Stepper test!");
 
   stepper.setSpeed(50);   
}

void loop()
{ 
   stepper.runSpeed();
}