Problem with Callback Function / BytesAvailableFcn on GUI
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i work since 3 days only on one thing ; to be able to receive continuously bytes from device (Arduino) on GUI programme but unfortunately i have not done. The Problem is that BytesAvailableFcn cannot be called.
function togglebutton1_Callback(hObject, eventdata, handles)
stat = get(hObject,'Value'); %returns toggle state of togglebutton1
if (stat == 1)
if ~isfield(handles, 'Ser')
set(hObject, 'String','Connected');
handles.Ser = serial('COM11','BaudRate', 9600);
handles.Ser.BytesAvailableFcnMode = 'Terminator';
set (handles.Ser,'RequestToSend','off');
set (handles.Ser,'Terminator','CR');
handles.Ser.BytesAvailableFcn = {@instrcallback,handles}; % Here the Problem!
fopen(handles.Ser) ;
end
elseif (stat == 0)
if isfield(handles, 'Ser')
fclose (handles.Ser);
handles = rmfield(handles, 'Ser');
end
end
guidata(hObject, handles)
function instrcallback(obj, eventdata, handles)
set(findobj('Tag','text2'),'String','Bytes Received!') ; % Test if that function works
3 个评论
Walter Roberson
2015-7-6
You did not say what difficulty you are encountering. Is the callback not being invoked? Have you tried
get(handles.Ser,'BytesAvailableFcn')
to be sure that it has been set to what you want?
Yassin Kim
2015-7-6
Yassin Kim
2015-7-6
编辑：Yassin Kim
2015-7-6
回答（1 个）
Harsha Medikonda
2015-7-7
0 个投票
'instrcallback' accepts two parameters. Please refer to the following documentation link
Also,please refer to the following link for the usage of bytesavailablefcn
1 个评论
Walter Roberson
2015-7-8
True, however it is only an error to specify more dummy parameters than actual arguments if one of the missing arguments is actually used.
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