Save time and key code of each key stroke in a queue

Programming Help
1

I need keypress times for all presses while a visual and a audio task are running simultaneously. I do not have any point in my code to set a while loop for KbCheck and I need a passive queue to save each key stroke and its press time. KbEventGet is not useful because it returns GetSecs time of each press.

My code is like this:

while totalTime < 30 
    PsychPortAudio('AddToSchedule', pahandle, bufferhandle_beep, prtcpnt.beepTime);
    PsychPortAudio('AddToSchedule', pahandle, bufferhandle_attentive, prtcpnt.attentiveTime);
end
 PsychPortAudio('Start', pahandle);
    
my visual task

I would appreciate it if anyone can show me the way!

2

I do not understand your statement " KbEventGet is not useful because it returns GetSecs time of each press". The time of KbEventGet is using the same clock as screen flips or audio timestamps.

3

I’m working on this code from github:

fprintf('5 of 6.  Testing KbQueueCheck asynchronously:\nPress one or more keys during the next 10 seconds.\n');
KbQueueCreate();
KbQueueStart();
WaitSecs(10);
fprintf('\n');
KbQueueStop();	% Stop delivering events to the queue
fprintf('Keypresses during the next 5 seconds will be ignored\n\n');
WaitSecs(5);
[ pressed, firstPress]=KbQueueCheck();
fprintf('You pressed the following keys during the interval when keypresses were being recorded:\n');
pressedKeys = KbName(firstPress)

fprintf('\n\nTesting KbEvent-Buffer. It should contain the same information.\n');
fprintf('During the test interval, %i events were recorded.\n', KbEventAvail());
fprintf('Will print all of them:\n\n');
while KbEventAvail()
    [evt, n] = KbEventGet();
    fprintf('Event is:\n'); disp(evt);
    fprintf('\nNow %i events remaining.\n', n);
end

fprintf('Done. Flushing the buffer for fun...\n');
n = KbEventFlush();
if n == 0
    fprintf('There were zero events remaining at flush time, as expected.\n');
else
    fprintf('Ohoh! There were %i events remaining, while i expected zero events?!?\n', n);
end
fprintf('KbEventBuffer test finished.\n\n');

KbQueueRelease();

and evt.time is the same for all keyboard events. Is that actually what the code should do or there is something wrong?

4

it works just fine for me. note that evt.Time is a huge number. compare the evt.Time from event 2-last with evt.Time from the 1st and you see that time is not the same.

5

Thanks for your quick answer. That was the point!