From the moment USB first hit the market, many people were unhappy about it-I mean DIY electronicians who power motors,… from their PC’s. Connecting a fan motor to the COM port for cooling spaghetti(no joke, did that once) is an easy task…
Anyways, Dallas-Maxim recently released an IC called MAX3420E. This IC is said to make USB accessable from an SPI interface with no major efforts.
The following Application notes contain further information:
APPLICATION NOTE 3637-Add USB to Anything
APPLICATION NOTE 3690-USB Enumeration Code (and More) for the MAX3420E
How do you connect your circuits to USB?
Related posts:

http://www.ftdichip.com
USB up and running within 5 minutes.
Hi Voice,
thanks for your comment. However, that link seems to be down…
Best regards
Tam Hanna
Try again, looser.