Breaking a loop GUI?

Reading in accelerometer data in a GUI code. I'm trying to break the loop while reading by using the following code...

function pushbutton8_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton8 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
a = getappdata(handles.text11, 'text11');

%COMPORT
comPort = '/dev/tty.usbmodemfd121';

%READS SERIAL

   [accelerometer.s,serialFlag] = setupSerial(comPort);
      calCo = calibrate(accelerometer.s);

%READS DATA
while (a == 0)
    if (a == 1)
        closeSerial
    end
    [gx gy gz] = readAcc(accelerometer,calCo);
cla;

      r = sqrt((gx^2)+(gy^2)+(gz^2));
      r

end
guidata(hObject, handles);

My problem is that the data keeps reading even when (a == 1), which is activated from a separate pushbutton. I've already tested the outputs of both each pushbuttons and they do read 0 and 1, but when reading the data, if I press the 1 pushbutton the data will still read.

[Amed]

The part in question is under %READS DATA, i'm trying to run the accelerometer, UNLESS another pushbutton is pressed, which should make a == 1

[Amed]

Anybody have an idea?

[Amed]

hmm

[Jan]

@Amed: Please do not bump your question frequently. If the contributors do not know an answer, it does not help to read trhe question one hour later again, as long as no additional information is provided. Thanks.

[Amed]

^Sorry. Anybody else have ideas? I haven't bumped in two days.

[Amed]

Anybody? This is a major assignment help a brother out

Answer 1

[Walter Roberson]

while true
  drawnow;
  a = getappdata(handles.text11, 'text11');
  if a == 0; break; end
  ...
end

[Amed]

Where in the code would I put this? Thanks

[Jan]

@Amed: Neither "oh ok" nor "anything" contains enough information to understand, if this answer has solved your problem or not. If you want help, provide more details instead of bumping the thread without new informations.