usb bus monitoring

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Hello

I am in the process of writing firmware for an USB device based on an 8051 core.
I am testing it against linux kernel driver.
 
I am submitting an urb to the device via a linux kernel modul, and I get no
response. The urb eventually times out. Via debug FS I can see that the urb is
indeed submitted. I suspect the firmware to be responsible for this. 

I would like to exclude the linux test driver owever, and wonder if there is a
cheap way to monitor what is happening on the USB bus itself. USB protocol
analyzer start at 1100 USD which is more than I would be willing to invest.

Thanks

Tilman

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