MATLAB: How to create a multi thread gui

guiserial

Hello how can i plot data real time in a gui?
The code below keeps blocking.I want when i press the close_port_btn the reading to stop. Since i have seen there is no function to get the serial status of the port i created that flag. This flag is intended to stop the reading. Somehow it seems the code won't exit that part of code. Do i need to do multithreading? And if so how can i achieve that?
function read_btn_Callback(hObject, eventdata,handles)
  % hObject    handle to read_btn (see GCBO)
  % eventdata  reserved - to be defined in a future version of MATLAB

  % handles    structure with handles and user data (see GUIDATA)

  global port;
  fopen(port);
    handles.flag=1;
    N=100;
    y=zeros(N,1);
    t=linspace(0,N,1);
    while (handles.flag~=0)
        y(1:end-1)=y(2:end);
       x=fscanf(port,'%d')/100
        plot(y,'LineWidth',2);
         grid on;
         axis([0 100 0 50])
    end
    guidata(hObject,handles);
function close_port_btn_Callback(hObject, eventdata, handles)
% hObject    handle to close_port_btn (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
global port;
fclose(port);
handles.flag=0;
guidata(hObject,handles);

Best Answer

function read_btn_Callback(hObject, eventdata,handles)
    % hObject    handle to read_btn (see GCBO)
    % eventdata  reserved - to be defined in a future version of MATLAB

    % handles    structure with handles and user data (see GUIDATA)

    global port;
    fopen(port);
      handles.flag=1;
      guidata(hObject, handles);
      N=100;
      y=zeros(N,1);
      t=linspace(0,N,1);
      while true
        drawnow();
        handles = guidata(hObject);
        if handles.flag == 0
          break;
        end
        y(1:end-1)=y(2:end);
        x=fscanf(port,'%d')/100
        plot(y,'LineWidth',2);
        grid on;
        axis([0 100 0 50])
      end
      fclose(port);
function close_port_btn_Callback(hObject, eventdata, handles)
% hObject    handle to close_port_btn (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
handles.flag=0;
guidata(hObject,handles);
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