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 void setMotor(int speedpin,int dirpin, int speed)
 {
  if (speed == 0)
  {
    digitalWrite(speedpin, LOW);
  }
  else if (speed > 0)
  {
    digitalWrite(dirpin, LOW);
    analogWrite(speedpin, speed);
  }
  else
  {
    digitalWrite(dirpin, HIGH);
    analogWrite(speedpin,255+speed);
  }
}

void setup(){
  pinMode(10, OUTPUT);
  pinMode(11, OUTPUT);
  digitalWrite(10, LOW);
  digitalWrite(11, LOW);
}

void loop(){
  setMotor(10, 11,-255);

}