How to control Raspberry Pi to measure distance using SRF05 ultrasonic sensor on MATLAB?

I am trying to control my Raspberry Pi 3 Model B to use SRF05 ultrasonic sensor on MATLAB. This is my hardware connection as shown in the image - Vcc to 5V - Trig to GPIO 21 - Echo is connected to a voltage divider circuit to ensure the input is around 3.3V, the input is connected to GPIO 20 - GND to GND

Here is my code:

clear all
mypi=raspi;
pin=mypi.AvailableDigitalPins;
trig=pin(18);
echo=pin(17);
configureDigitalPin(mypi,trig,'output');
configureDigitalPin(mypi,echo,'input');
writeDigitalPin(mypi,trig,0);
while 1
    writeDigitalPin(mypi,trig,0);
    pause(2)
    writeDigitalPin(mypi,trig,1);
    pause(0.00001)
    writeDigitalPin(mypi,trig,0);

      while readDigitalPin(mypi,echo)==0
          continue
      end
      tic
      while readDigitalPin(mypi,echo)==1
          continue
      end
          duration= toc

      distance=duration*17150
  end

I try this code, but the result is not shown, please help me to correct the code. I'm a beginner in MATLAB. Thank you everyone!

[Sinan Çolak]

could you solve the problem? I have a similar issue...