Stop button (GUI)

Hi,

I have this code below(except for a few beginning lines) and I have problems because I want the measurement to stop when I click on the Stop button, but it doesn't work. Any idea of the problem?

        % --- Executes just before Medida_Serial_hcsr04 is made visible.
        function Medida_Serial_hcsr04_OpeningFcn(hObject, eventdata, handles, varargin)
        % This function has no output args, see OutputFcn.
        % hObject    handle to figure
        % eventdata  reserved - to be defined in a future version of MATLAB
        % handles    structure with handles and user data (see GUIDATA)
        % varargin   command line arguments to Medida_Serial_hcsr04 (see VARARGIN)

        % Choose default command line output for Medida_Serial_hcsr04
        handles.output = hObject;

        set(handles.guardar,'Enable','off'); 

        handles.stop=false;
        % Update handles structure
        guidata(hObject, handles);

        % UIWAIT makes Medida_Serial_hcsr04 wait for user response (see UIRESUME)
        % uiwait(handles.figure1);

        % --- Outputs from this function are returned to the command line.
        function varargout = Medida_Serial_hcsr04_OutputFcn(hObject, eventdata, handles) 

        varargout{1} = handles.output;

        % --- Executes on button press in Medir.
        function Medir_Callback(hObject, eventdata, handles)
        % hObject    handle to Medir (see GCBO)
        % eventdata  reserved - to be defined in a future version of MATLAB
        % handles    structure with handles and user data (see GUIDATA)
        set(handles.Abrir,'Enable','off'); 
        %handles.stop=0;
        cla reset; %Limpiar la grafica cada vez que se hace click

        s = abrir_puerto();

        handles.x=1:100;
        handles.h=animatedline('Marker','o','LineWidth',1,'Color','b');
        xlabel('Number of samples');
        ylabel('Distance (cm)');

        i=0;    %Hay que recoger aqui el valor del que le pasa el stop button
          while handles.stop==false
                handles.distancia(i)=fscanf(s,'%d');
                addpoints(handles.h,i,handles.distancia(i));    
                drawnow;
                i=i+1;       
          end

        set(handles.guardar,'Enable','on'); 
        set(handles.Abrir,'Enable','on'); 
        guidata(hObject,handles);
        cerrrar_puerto(s);

        % --- Executes on button press in guardar.
        function guardar_Callback(hObject, eventdata, handles)
        % hObject    handle to guardar (see GCBO)
        % eventdata  reserved - to be defined in a future version of MATLAB
        % handles    structure with handles and user data (see GUIDATA)
        dist = handles.distancia;
        guardar_archivo(dist);

        % --- Executes on button press in Abrir.
        function Abrir_Callback(hObject, eventdata, handles)
        % hObject    handle to Abrir (see GCBO)
        % eventdata  reserved - to be defined in a future version of MATLAB
        % handles    structure with handles and user data (see GUIDATA)
        Abrir_fichero();

        % --- Executes on button press in stop.
        function stop_Callback(hObject, eventdata, handles)
        % hObject    handle to stop (see GCBO)
        % eventdata  reserved - to be defined in a future version of MATLAB
        % handles    structure with handles and user data (see GUIDATA)

        % Hint: get(hObject,'Value') returns toggle state of stop
        handles.stop=true;
        guidata(hObject,handles);

Thank you

Answer 1

[Image Analyst]

I have attached a demo for that.

Answer 2

[Jan]

You use the value of the handles struct, but do not update the struct:

while handles.stop==false
   distancia(i)=fscanf(s,'%d');
   addpoints(handles.h,i, distancia(i));
   drawnow;
   i=i+1;
   handles = guidata(hObject);  % <- get the current value
end
handles.distancia = distancia;  % <- to avoid overwriting by GUIDATA

[Itziar Uzqueda]

it's not working. It looks as if it wasn't changing the value os handles.stop. It never stops

[Itziar Uzqueda]

Finally I have solved using global variables. Thank you