using callback function in timer with a function generated within script

Hi all,

I think I have a reasonably straightforward question. I am trying to use a timer function in matlab but I am getting a consistent error. I have generated a gui and I want it to execute a function periodically when a button is pressed. The troublesome part of the code looks like this

acquisitionTimer = timer;
acquisitionTimer.ExecutionMode = 'fixedRate';
acquisitionTimer.TasksToExecute = sweepsPerTrigger;
acquisitionTimer.Period = inter_stimulus_interval;
acquisitionTimer.StopFcn = @acquisitionTimerCleanup;
acquisitionTimer.TimerFcn = @(myTimerObj, thisEvent)startAcquisition;

start(acquisitionTimer);

function acquisitionTimerCleanup(acquisitionTimer,~)
disp('Done Acquiring');
delete(acquisitionTimer)

function startAcquisition
(this starts my aquisition code)

--- So I think my problem is with the callback function line

acquisitionTimer.TimerFcn = @(myTimerObj, thisEvent)startAcquisition;

I get the impression this is not how you start a function when linking it with a timer. Any advice would be greatly appreciated. I looked at the documention, but unfortunately, I can't seem to figure it out right now.

Thanks, Quentin

[Walter Roberson]

What is the error message?

Answer 1

[per isakson]

I put your code into one m-file and it worked. I cannot see any problem. With R2013a

    >> cssm
    start Acquisition
    start Acquisition
    Done Acquiring
    >>

where cssm is

    function cssm
        acquisitionTimer = timer;
        acquisitionTimer.ExecutionMode = 'fixedRate';
        acquisitionTimer.TasksToExecute = 2;
        acquisitionTimer.Period = 1;
        acquisitionTimer.StopFcn = @acquisitionTimerCleanup;
        acquisitionTimer.TimerFcn = @(myTimerObj, thisEvent)startAcquisition;

        start(acquisitionTimer);
    end
    function acquisitionTimerCleanup(acquisitionTimer,~)
        disp('Done Acquiring');
        delete(acquisitionTimer)
    end
    function startAcquisition
    %    (this starts my aquisition code)
        disp('start Acquisition')
    end

Answer 2

[Quentin]

Thank you for the help. Once I put it into one code and saw it work, I realized the problem was most likely in the gui. I'm trouble shooting the gui now but your input helped me locate the troublesome code.

Thanks again, Quentin