how to reinitialize usb device

Is there a way to reinitialize or re-instantiate a usb device in matlab? I am using a Total Phase Aardvark spi controller and if I try to run the script a 2nd time I always get a "Error communicating with Hardware" error for the Aardvark. I do a disconnect at the end of the script and clear the comport variable.

Answer 1

[Star Strider]

We would need to see your code.

You will likely have to use the delete function to completely clear the serial object first.

[Randy Gatewood]

% connect to aardvark
spi0 = spi('aardvark', 0, 0);
spi0.BitRate = 8000000;
pause(.2);
connect(spi0);

... pgm here ...

disconnect(spi0);
clear spi0;

[Star Strider]

I didn’t realise you were using the Instrument Control Toolbox. I just added it as a Product Tag to your post.

I don’t have it, so I have no experience with it. (It’s not required to connect to serial devices with USB, and while I’ve used USB devices, I’ve always just used the serial capabilities in core MATLAB, or the Hardware Support Packages for Arduino and Raspberry Pi.)

The only thing I can do is to direct you to the resources you’ve likely already surfed: SPI Communication for the Instrument Control Toolbox, and to Contact Tech Support if none of the documentation options work.