HCSR04 Sensor ( Ultrasonic Sensor )

Can anyone pls give me any example how to use this sensor on "DE-2 115" board . I am really struggling with this sensor. I just need an example in verilog using this sensor. The project that I am doing requires the sensor to calculate the distance from the sensor to an object . Your early reply will be highly appreciated

Best Regards

Khandaker Noor.