control stepper motor using MATLAB and Arduino

I am trying to set up a stepper motor connected to an Arduino Uno with motor shield mounted on it.

The motor works through Arduno IDE.

I am trying to translate the code in MATLAB ...without success

here is my arduino code:

// Include the Stepper library<br>#include
#include <Stepper.h> 
// Declare the used pins
int dirA = 12;
int dirB = 13;
int pwmA = 3;
int pwmB = 11;
// Declare a Stepper motor with 200 steps 
Stepper stepper1(200, dirA, dirB);
void setup() {
  // PWM pins require declaration when used as Digital
  pinMode(pwmA, OUTPUT);
  pinMode(pwmB, OUTPUT);
  
  // Set PWM pins as always HIGH
  digitalWrite(pwmA, HIGH);
  digitalWrite(pwmB, HIGH);
  
  // Set stepper motor speed
  stepper1.setSpeed(30);
}
void loop(){
  // Turn the stepper 100 steps which means 180 degrees
  stepper1.step(2000);
  // Wait half second
  delay(500);
  
  // Turn the stepper 100 steps back which means 180 degrees
  stepper1.step(-200);
  // Wait half second
  delay(500);
}

and here is my MATLAB code:

clear all
global a;
% a = arduino('COM3','Uno');
a = arduino('COM3','Uno','Libraries','Adafruit\MotorShieldV2'); % load arduino package including motor shield
%% create shield object to control the motor
shield = addon(a,'Adafruit\MotorShieldV2');
sm = stepper(shield,1,200);
%% specify speed and movement direction
  for i = 1:5
   sm.RPM = 30;
   move(sm, 200);
   pause(2);
   move(sm, -200);
  end
   release(sm);

any idea why it does not move ? the code per se should be correct (I do not get any error).

Thanks !

[Ernest Arranz Pasqual]

Hi, I'm also working on a stepper matlab arduino project. From what I undersand here:

https://es.mathworks.com/matlabcentral/answers/298834-2-problems-with-stepper-motor-control-using-arduino-and-matlab-gui

it seems the problem is the pause function which can't operate with values low enough.