Stepper wait for X seconds in a loop with millis (not delay)

Question

In the code below I would like the stepper to bounce back and forward between two limit switches and while it is doing this it should turn and than wait for e.g. 1 second.

I thought I could achieve this with the if ((unsigned long)(currentMillis - previousMillis) >= interval) part, but it doesn't work.It won't turn. Any help would be great. Thank you.

// defines pins numbers
const int stepPin = 5;
const int dirPin = 4;
const int enPin = 12;
const int homeSwitchPin = 9;
const int homeSwitchPin2 = 11;

unsigned long interval=1000; // the time we need to wait
unsigned long previousMillis=0; // millis() returns an unsigned long.

void setup() {

   Serial.begin(9600);

  // Sets the two pins as Outputs
  pinMode(stepPin,OUTPUT);
  pinMode(dirPin,OUTPUT);
  pinMode(homeSwitchPin , INPUT);
  pinMode(homeSwitchPin2 , INPUT);
  pinMode(enPin,OUTPUT);
  digitalWrite(enPin,LOW);

  // Set Dir to Home switch
  digitalWrite(dirPin,LOW); // Enables the motor to move in a particular direction


}
void loop() {

    int homeSw = digitalRead( homeSwitchPin);
    int homeSw2 = digitalRead( homeSwitchPin2);

    if( homeSw == HIGH && (digitalRead(dirPin) == LOW) ){
        unsigned long currentMillis = millis();

        if ((unsigned long)(currentMillis - previousMillis) >= interval) {
        motorStep(1);
        previousMillis = millis();
        }
    }
    else if( homeSw == LOW && (digitalRead(dirPin) == LOW) ){
          digitalWrite(dirPin,HIGH);
          delay(2000);
    }


    if( homeSw2 == HIGH && (digitalRead(dirPin) == HIGH)){

        motorStep(1);
        // motorStep(32000);
        //digitalWrite(dirPin,LOW);

        //delay(2000);
    }
    else if( homeSw2 == LOW && (digitalRead(dirPin) == HIGH) ){
          digitalWrite(dirPin,LOW);
          delay(2000);
    }

}
void motorStep( int MAX){

   for(int x = 0; x < MAX; x++) {
        digitalWrite(stepPin,HIGH);
        delayMicroseconds(100);
        digitalWrite(stepPin,LOW);
        delayMicroseconds(100);
      }
}