MATLAB GUI SERIAL COMMUNICATION

Hi

I wann do create an form having button,textbox,serialport in Matlab GUI.My objective is when a button press the data coming from the serial port has to displayed in textbox.Here's my code.Textbox is not displaying anything.i cant figureout what may be the problem.

      if true
      %    function varargout = m3(varargin)
  % M3 M-file for m3.fig
  %      M3, by itself, creates a new M3 or raises the existing
  %      singleton*.
  %
  %      H = M3 returns the handle to a new M3 or the handle to
  %      the existing singleton*.
  %
  %      M3('CALLBACK',hObject,eventData,handles,...) calls the local
  %      function named CALLBACK in M3.M with the given input arguments.
  %
  %      M3('Property','Value',...) creates a new M3 or raises the
  %      existing singleton*.  Starting from the left, property value pairs are
  %      applied to the GUI before m3_OpeningFcn gets called.  An
  %      unrecognized property name or invalid value makes property application
  %      stop.  All inputs are passed to m3_OpeningFcn via varargin.
  %
  %      *See GUI Options on GUIDE's Tools menu.  Choose "GUI allows only one
  %      instance to run (singleton)".
  %
  % See also: GUIDE, GUIDATA, GUIHANDLES

% Edit the above text to modify the response to help m3

% Last Modified by GUIDE v2.5 25-Apr-2013 05:56:08

% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @m3_OpeningFcn, ...
                   'gui_OutputFcn',  @m3_OutputFcn, ...
                   'gui_LayoutFcn',  [] , ...
                   'gui_Callback',   []);
if nargin && ischar(varargin{1})
    gui_State.gui_Callback = str2func(varargin{1});
end

if nargout
    [varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});
else
    gui_mainfcn(gui_State, varargin{:});
end
% End initialization code - DO NOT EDIT

% --- Executes just before m3 is made visible.
function m3_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 m3 (see VARARGIN)

% Choose default command line output for m3
handles.output = hObject;

% Update handles structure
guidata(hObject, handles);

% UIWAIT makes m3 wait for user response (see UIRESUME)
% uiwait(handles.figure1);

% --- Outputs from this function are returned to the command line.
function varargout = m3_OutputFcn(hObject, eventdata, handles) 
% varargout  cell array for returning output args (see VARARGOUT);
% hObject    handle to figure
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Get default command line output from handles structure
varargout{1} = handles.output;

% --- Executes on button press in pushbutton1.
function pushbutton1_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
global s
s=serial('COM4','BaudRate',9600,'DataBits', 8, 'Parity', 'none','StopBits', 1, 'FlowControl', 'none','Terminator','CR'); 
fopen(s)
a=fgets(s)
set(edit1,'String',a);
fclose(s)
delete(s)

function edit1_Callback(hObject, eventdata, handles)
% hObject    handle to edit1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: get(hObject,'String') returns contents of edit1 as text
%        str2double(get(hObject,'String')) returns contents of edit1 as a double

% --- Executes during object creation, after setting all properties.
function edit1_CreateFcn(hObject, eventdata, handles)
% hObject    handle to edit1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: edit controls usually have a white background on Windows.
%       See ISPC and COMPUTER.
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end
  end

[Walter Roberson]

"It's not working" is not informative. What happens?

[Walter Roberson]

Set a breakpoint at the line

set(edit1,'String',a);

and run your program, clicking the pushbutton. When the program stops running, show

class(a), size(a), (a+0)

what results do you get?

Are you getting a warning message about timeouts ?

[aswathy]

how can it be do?

[Walter Roberson]

http://www.mathworks.com/help/matlab/ref/dbstop.html

http://www.mathworks.com/help/matlab/matlab_prog/debugging-process-and-features.html#brqxeeu-182

[aswathy]

I included dstop after set(edit1,'String',a) but still the results be same and matlab is not responding too

[Walter Roberson]

Does it stop responding completely, or does it just stop responding for about a minute? If it stops responding for about a minute, it is waiting for data for up to the timeout period. Either there is no data coming in (in that case) or else the data does not have CR.

How is the other side to know to transmit data at that particular time? Or does it just keep sending lines?

[Abiodun]

what if one wants to plot a graph of the data acquired through the serial port?..how do 1 go about it?...please help

[Rosa Arzabala]

hey, did you fix the problem? i'm trying to do that but haven't succeeded