V-USB - A Firmware-Only USB Driver for Atmel AVR MicrocontrollersV-USB is a software-only implementation of a low-speed USB device for Atmel’s AVR® microcontrollers, making it possible to build USB hardware with almost any AVR® microcontroller, not requiring any additional chip. Fully USB 1.1 compliant low-speed device, except handling of communication errors and electrical specifications. Example projects demonstrate device and host driver implementations on L
http://www-ice.yamagata-cit.ac.jp/ken/senshu/sitedev/index.php?AVR%2Fnews42
