GUI:Usage of start button runs for once and then MATLAB gets strucked

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Gova ReDDy
Gova ReDDy 2014-3-16
评论： Walter Roberson 2017-2-3
Hello,
I made a GUI in GUI builder and expected to work like this
start button : start streaming the data from comport should stop the streaming data
start button : should stop the data streaming from comport
Exit button : should close the GUI
Problem: 1)when the start button is clicked it is streaming the data and showing on the plot perfectly but when a exit was made and tried to start the data streaming again by clicking the start button it is showing
MATLAB:serial:fopen:opfailed in command window
and the MATLAB gets strucked and needs a manual restart.
2) Also clicking the stop button is not stopping the data streaming.
function varargout = start1(varargin)
gui_Singleton = 1;
gui_State = struct('gui_Name', mfilename, ...
'gui_Singleton', gui_Singleton, ...
'gui_OpeningFcn', @start1_OpeningFcn, ...
'gui_OutputFcn', @start1_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
function start1_OpeningFcn(hObject, eventdata, handles, varargin)
handles.output = hObject;
guidata(hObject, handles);
function varargout = start1_OutputFcn(hObject, eventdata, handles)
varargout{1} = handles.output;
start=uicontrol('Style','pushbutton','String', 'start', 'Position',[20 400 50 20],'Callback',@startbutton_Callback);
stop=uicontrol('Style','pushbutton','String', 'stop', 'Position',[20 300 50 20],'Callback',@stopbutton_Callback);
Exit=uicontrol('Style','pushbutton','String', 'Exit', 'Position',[20 100 50 20],'Callback',@pushbutton1_Callback);
writetofile=uicontrol('Style','pushbutton','String', 'writetofile', 'Position',[20 200 50 20],'Callback',@writetofile_Callback);
function pushbutton1_Callback(hObject, eventdata)
handles = guidata(hObject);
s_quitgui = true;
display('Goodbye');
close(gcf);
function startbutton_Callback(hObject, eventdata)
handles = guidata(hObject);
axes(handles.axes2);
linewidth = 1;
raw1_gyr = line('Parent',handles.axes2,...
'XData',[],...
'YData',[],...
'Color',[0 0 1],...
'LineWidth',linewidth);
com_port = 12;
sampleCounter = 1;
dt = 5*(1e-2);
data_file_name = 'pulse_data.txt';
FID = [];
s_writetofile = false;
s_quitgui = false;
s1 = open_com_port(12);
gui_update_freq_divisor = 20;
flushBytesThreshold = 1000;
k = 1;
while ~s_quitgui
nb = s1.BytesAvailable;
if nb > flushBytesThreshold
error('serial data overflow')
end
if(nb)
currtime(k) = sampleCounter*dt;
[tline,count] = fgetl(s1);
data_tmp = str2num(char(tline));
data(k)=(data_tmp);
if s_writetofile
fprintf(FID,'%f %f \n',currtime,data);
end
if (~mod(sampleCounter,gui_update_freq_divisor))
axes(handles.axes2);
set(raw1_gyr,'XData',[get(raw1_gyr,'Xdata') currtime]);
set(raw1_gyr,'YData',[get(raw1_gyr,'YData') data]);
set(handles.axes2,'XLim',[currtime(1)-1 currtime(1)])
set(handles.axes2,'YLim',[-1 5000])
k = 0;
end
sampleCounter = sampleCounter + 1;
k = k + 1;
end
end
function stopbutton_Callback(hObject, eventdata)
handles = guidata(hObject);
function writetofile_Callback(hObject,eventdata)
s_writetofile = false;
data_file_name = 'pulse_data.txt';
if s_writetofile
fclose(FID);
s_writetofile = false;
set(writetofile,'String','Write to File',...
'BackgroundColor', defaultuibgcolor)
else
FID = fopen(data_file_name,'w');
s_writetofile = true;
set(writetofile,'String','Stop Writing',...
'BackgroundColor','red')
end
function textbox1_Callback(hObject, eventdata, handles)
% --- Executes during object creation, after setting all properties.
function textbox1_CreateFcn(hObject, eventdata, handles)
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
set(hObject,'BackgroundColor','white');
end
Here open_com_port is a fucntion for the comport settings.
can someone help me out in figuring the solution to these.
Thanks.
  4 个评论
显示 2更早的评论
Jan
Jan 2017-2-3
It was impossible to answer the question.
2) Also clicking the stop button is not stopping the data streaming.
But the callback of the stop button was:
function stopbutton_Callback(hObject, eventdata)
handles = guidata(hObject);
It is clear, that nothing happens here, because there is no code which tries to let anything happen.
The comport was opened, but not closed anywhere. So, VRM, please open a new thread and ask a specific question. Post your code and explain, what is not working as expected.

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