USB Library for Cortex M3

Hi,

Has anyone got a USB Library for the Cortex M3?

I'm only after virtual com port support.

I've seen the STMicroelectronics stuff on their web site, but there is no Crossworks project for it. The code base/libraries are massive and I want it to work with CTL (if poss).

Has anyone succeeded in getting anything working, or any ideas that will point me in the right direction.

cheers

Mark

(PS - would a ARM7 USB library work ? If so, any one have any good implementations for that?)