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xyphro / UsbGpib

Versatile, cheap and portable USB to GPIB converter (USBTMC class based)
MIT License
289 stars 51 forks source link

Computer hangs at boot with USB device connected #5

Closed hppi-johnsson closed 2 years ago

hppi-johnsson commented 4 years ago

Hi,

I really appreciate this project. It helped me to create a USBTMC device by removing the GPIB part and implementing own functions. I got it working in Windows. VISA displays my device and I can communicate with it.

But, if I start the computer with the USBTMC device in the port, the computer simply won't boot. I have tried this on 3 different computers. I suppose it has something to do with the USB enumeration in BIOS. I would be grateful if anyone has an idea what could be wrong.

The simplest way to reproduce the problem is to comment out lines 382, 387-442 and 454-461 to skip the GPIB part.

Xyp commented 4 years ago

Hi!

Can you contact me at above email address? Will also post the solution here, once identified. Sorry, only see the issue now first time.

Best regards,

Kai