USB device not recognized on XP (SP3) when using CDC

kseverinkangas · ‎2012-04-18

Posted on April 18, 2012 at 16:03

Hi,

I used the following example code for trying out the usb cdc communication with stm32 discovery.

On my development laptop (Thinkpad t520), usb device is not recognized and vid and Pid fields are zeros. On

other computers with linux, windows7 and the same XP version,

the discovery board is recognized

. So the problem seems to be hw related.

I have tried the USB HID demo and that works fine.

Any ideas how to get usb device recognized (other than change the laptop)?

Cheers,

Kari

kseverinkangas · ‎2012-04-19

Posted on April 19, 2012 at 14:03

Hi,

I managed to get into same situation on other computer running xp and found out that installing the libusb filter causes the problem. Later I found out that the filter app is not needed anymore. But running uninstall didn't help. To fix the problem I had to do restore for windows and then change the VID and PID of the test application. However this fix didn't work on my T520 laptop. So probably I will need to re-install Windows.

It seems that this is libusb filter app related problem.

Cheers,

Kari