OBJ must be connected to the hardware with FOPEN.

[Dong Joo Kang]

Hi, I makes gui for serial communication

I have problem timer and fopen.
Here is my error message, 'error OBJ must be connected to the hardware with FOPEN.'

my code is too long so i capture part.

-----------------------------------------------------------------------------------------------
function GCS_initial1_OpeningFcn(hObject, eventdata, handles, varargin)
%Serial Port update
serialPorts = instrhwinfo('serial');
nPorts = length(serialPorts.SerialPorts);
set(handles.COMPORT_popup, 'String', ...
[{'Select a port'} ; serialPorts.SerialPorts ]);
set(handles.COMPORT_popup, 'Max', 2);

%repeat 0.5sec print data
handles.t=timer('TimerFcn', {@data_cal, hObject},'Period',0.5,'ExecutionMode', 'fixedRate');
handles.output = hObject;

% Update handles structure
guidata(hObject, handles);

function Open_button_Callback(hObject, eventdata, handles)
serPortn = get(handles.COMPORT_popup, 'Value');
if(serPortn==1)
errordlg('Select valid COM port');
else

serList = get(handles.COMPORT_popup,'String');
serPort = serList{serPortn};

Xbee_Comport = serial(serPort, 'BaudRate', 9600,'DataBits',8,'StopBits',1);
Xbee_Comport.Terminator = 'CR/LF';
Xbee_Comport.BytesAvailableFcnMode = 'terminator';

try
fopen(Xbee_Comport);
handles.Xbee_Comport=Xbee_Comport;
fp1 = fopen('data_log.txt', 'w');
set(handles.Serial_State, 'String', 'Serial Open');
handles.fp1=fp1;
fprintf(handles.fp1,'Start Record Data\n');
start(handles.t);

catch e
errordlg(e.message);

end
end
guidata(hObject, handles);

function Close_button_Callback(hObject, eventdata, handles)
% hObject handle to Close_button (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
fprintf(handles.fp1,'Finish Record Data\n');
fclose(handles.Xbee_Comport);
fclose(handles.fp1);
stop(handles.t);
set(handles.Serial_State, 'String', 'Serial Close');

function data_cal(obj,event,hfigure)
handles=guidata(hfigure);
XbeeToData;

--------------------------------------------------------------------------------------------
---------XbeeToData.m-----------------
global DATA;
DATA=fscanf(handles.Xbee_Comport);
fprintf(handles.fp1,DATA);

[dpb]

On 08/02/2015 10:20 AM, Dong Joo Kang wrote:
> Hi, I makes gui for serial communication
>
> I have problem timer and fopen. Here is my error message, 'error OBJ
> must be connected to the hardware with FOPEN.'
>
> my code is too long so i capture part.

....

> function Open_button_Callback(hObject, eventdata, handles)
> serPortn = get(handles.COMPORT_popup, 'Value');
> if(serPortn==1)
> errordlg('Select valid COM port');
> else
> serList = get(handles.COMPORT_popup,'String');
> serPort = serList{serPortn};
> Xbee_Comport = serial(serPort, 'BaudRate', 9600,'DataBits',8,'StopBits',1);
> Xbee_Comport.Terminator = 'CR/LF';
> Xbee_Comport.BytesAvailableFcnMode = 'terminator';
>
> try
> fopen(Xbee_Comport);
> handles.Xbee_Comport=Xbee_Comport;
> fp1 = fopen('data_log.txt', 'w');
> set(handles.Serial_State, 'String', 'Serial Open');
> handles.fp1=fp1;
> fprintf(handles.fp1,'Start Record Data\n');
> start(handles.t);
> catch e
> errordlg(e.message);
> end
> end

...

So, you're not checking the returned status of the FOPEN() call; what is
it when you use DEBUG??? (One presumes owing to the error message that
it will be '{closed}'. Your mission, should you choose to accept it,
will then be to uncover "why?" and resolve talking to the device at the
command line before worrying about complex code.

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