"Not enough input arguments " error when using timer

Hi, i'm new to matlab and i'm trying to make that when click the button in GUI it will open the serial port then run my DATA function by using timer. Here is my code

function timer_deneme_OpeningFcn(hObject, eventdata, handles)
% 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 timer_deneme (see VARARGIN)
clc
delete(instrfind);
delete(timerfindall);
 
[~,serialPorts] = dos(['REG QUERY ' 'HKEY_LOCAL_MACHINE\HARDWARE\DEVICEMAP\SERIALCOMM']);
ports=regexp(serialPorts,'COM[0-9]+','match');
port=ports;
handles.portlist.UserData = 0;
setappdata(handles.portlist.Parent,'ports',port);
 
while(get(handles.Connect,'UserData'))
    pause(0.5);
end
 
menuitem=get(handles.portlist,'String');
menuitem=getappdata(handles.portlist.Parent,'ports');
set(handles.portlist,'String',menuitem);
 
 
handles.t = timer;
handles.t.TimerFcn = @DATA;
handles.t.Period = 1;
handles.t.BusyMode = 'drop';
handles.t.ExecutionMode = 'fixedRate';
 
% Choose default command line output for timer_deneme
handles.output = hObject;
 
% Update handles structure
guidata(hObject, handles);
 
% UIWAIT makes timer_deneme wait for user response (see UIRESUME)
% uiwait(handles.figure1);
 
 
% --- Outputs from this function are returned to the command line.
function varargout = timer_deneme_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 selection change in portlist.
function portlist_Callback(hObject, eventdata, handles)
% hObject    handle to portlist (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
 
% Hints: contents = cellstr(get(hObject,'String')) returns portlist contents as cell array
%        contents{get(hObject,'Value')} returns selected item from portlist
 
 
% --- Executes during object creation, after setting all properties.
function portlist_CreateFcn(hObject, eventdata, handles)
% hObject    handle to portlist (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called
 
% Hint: popupmenu 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
 
 
% --- Executes on button press in Connect.
function Connect_Callback(hObject, eventdata, handles)
% hObject    handle to Connect (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
 
 
    serPortn = get(handles.portlist, 'Value');
    serList = get(handles.portlist,'String');
    serPort = serList{serPortn};
    handles.serConn = serial(serPort,'BaudRate',57600,'DataBits',8);
    start(handles.t)
    fopen(handles.serConn);
    
    guidata(hObject, handles);
  
    
    
 function DATA(hObject, eventdata, handles)
 
     disp('HERE I AM')
 
 while (1)
   Header = dec2hex(fread(handles.serConn, [1 5]));
   Header=[Header(1,:) Header(2,:) Header(3,:) Header(4,:) Header(5,:)];
   a =size(Header);
   if a(1,2) == 10
    if Header == '6642AA4456'     
        break
    end
    end
 end
 
     Temperature = dec2hex(fread(handles.serPort,[1 2]));
     Temperature = [Temperature(1,:) Temperature(2,:)];
     aa = size(Temperature);
     
     if aa(1,2) == 2
        Temperature = 256*hex2dec(Temperature(1)) + 16*hex2dec(Temperature(2));
        Temperatureacisi = Temperature*360/2^16;  
     else
          Temperature = hex2dec(Temperature);
          Temperatureacisi = Temperature*360/2^16;         
     end
     
     if Temperatureacisi > 180 && Temperatureacisi < 360
        Temperatureacisi = Temperatureacisi-360;
     end 
      
    
 
 
function DisConnect_Callback(hObject, eventdata, handles)
% hObject    handle to DisConnect (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
    stop(handles.t)
    fclose(handles.serConn);
    delete(handles.serConn);
    set(handles.lamb, 'BackgroundColor','red');

And I got the error. In my DATA function if I comment all line except disp('HERE I AM') , the everything works fine. Unless if uncomment all line in DATA function , then I getting the same errror.

Error while evaluating TimerFcn for timer 'timer-1'

Not enough input arguments.

I have no idea how to solve this problem.

I would really appreciate any help

Thank you in advance.

Answer 1

[Geoff Hayes]

Abdulbaki - the function signature for your timer callback is

function DATA(hObject, eventdata, handles)

The timer function callback generally only has two input paramters - the handle to the timer object (hObject), and some event data (eventdata). You can add one or more additional parameter but you need to define those when you assign the callback to your timer. You are doing this at the line

handles.t.TimerFcn = @DATA;

and so the error message makes sense: there are not enough input parameters to your function since your signature expects three but only the default two are provided. What you need to do is something like

handles.t.TimerFcn = {@DATA, hObject};

where hObject is the handle to your GUI. Your callback signature and body then becomes

function DATA(hObject, eventdata, hFigure)
handles = guidata(hFigure);
% etc.

Note that we pass the GUI/figure handle into this callback and, from that, retrieve the handles structure rather than passing in the handles structure directly when we assign the callback to the timer. This is because the handles structure (if passed into the timer callback) will just be a copy at the time the callback is assigned, and will not be the most up-to-date version that we would get when using guidata(hFigure).