CyUSB.dll in MATLAB: problems at indexing a device_list

	alermto posted on 17 Apr 2013 9:10 AM PST Senior Member 14 Forum Posts

Hi everybody, and thank you again for your help.

I managed loading the .NET CyUSB.dll library in MATLAB with the command NET.addAssembly.

Then, I also managed creating a list of devices, with:

devList = CyUSB.USBDeviceList(CyUSB.CyConst.DEVICES_CYUSB);

which is something like a MATLAB transposition of the C# code provided in the reference guide for the .dll.

The output demonstrates that a device has been found ( devList.Count outputs '1'), but I cannot access the first element of the list.

devList(0) is simply not allowed, and MATLAB itself suggests using an "Item" method. So if I use:

devList.Item(0) MATLAB crashes.

I'm pretty sure that this should be the procedure: devList.Item(1), for example, outputs an error saying that I went out of range. devList(1204, 4100), makes MATLAB crash again (note: those numbers are the decimal value of VID and PID of the connected device), while devList(whatever other couple of numbers) just outputs an empty string.

I didn't manage getting an error log from MATLAB.

Is there anything wrong with my approach? Is there a way to solve this issue? Somebody, a few time ago, posted a problem quite similar to mine, here in this forum (http://www.cypress.com/?app=forum&id=167&rID=48607) but I don't know if he managed to get it working.

Thank you very much for your help!

Alessandro

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CyUSB.dll in MATLAB: problems at indexing a device_list