Control dsp.audiodevicewriter with a toggle switch button

Hello,

I would like to create a toggle button allowing user to chose when to start/stop my noise sample. (I attached a photo)

value of "stop" is '1' and value of "Play" is '2'

It starts correctly, but I can't stop the sound. I am using the app designer. Here is my code:

 function replayone(app,event)
 value = app.Switch.Value;
 afr = dsp.AudioFileReader([app.dir '/audio_track/track' num2str(app.index) '.wav']);
 Fs = afr.SampleRate; 
 adw = audioDeviceWriter('SampleRate', Fs);

 app.counter = 0;

 while ~isDone(afr)
         audioIn = afr();

         if app.counter == 0
               click = ones([1,length(audioIn)])*0.3;
         else
               click = zeros*(1:length(audioIn));
         end

         t = (app.counter + 1 : app.counter + size(audioIn, 1));

         app.counter = t(end);

         audioout = [audioIn click'];
         event.Source
         if event.Value == '1'
              break
         end

         adw(audioout);

 end

 delete(adw), delete(afr)

 end

I have been trying quite a few condition, however it looks like when it enters in the loop "while ~isdone" it doesn't check the value of the toggle button anymore. I also have tried with 'switch' and different case but didn't resolve it. Thank you

Answer 1

[Walter Roberson]

The event queue will not be checked until a drawnow() or pause() or a figure() or a uiwait() or waitfor() .

Furthermore, the event parameter will not be updated because the function is not being invoked a second time. Instead of checking event.Value, you need to check app.Switch.Value

[Bastien Lechat]

drawnow() was the missing part ! Thank you so much