How can I automatically detect and log changes to a USB joystick's position connected via vrjoystick?

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Jeffrey Girard 2017-3-19

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https://ww2.mathworks.cn/matlabcentral/answers/330714-how-can-i-automatically-detect-and-log-changes-to-a-usb-joystick-s-position-connected-via-vrjoystick

编辑： Jeffrey Girard 2017-3-19

I have a USB joystick that I would like to record the position of at a high frequency in MATLAB 2017a.

I understand that I can get the position of the joystick (i.e., axes) using:

    joy = vrjoystick(1);
    [axes,buttons,povs] = read(joy);

I am currently using a timer callback to call this read function every 0.05 sec. However, the timer often does not achieve the appropriate frequency and sometimes 1 or more seconds will pass without the timer completing. I thus lose some data this way. Is there a way to improve the timer or to more efficiently query the position of the joystick? Perhaps there's a way to detect changes to the joystick position and write these directly to a file?