Tips-VUSB
V-USB
もと AVR-USB atmega128 を直接USBにつないだプロジェクト
DownLoad
https://www.obdev.at/products/vusb/index.html
https://github.com/obdev/v-usb
atmega328p
https://qiita.com/erukiti/items/548bbd1e38aaa3083446
https://github.com/baerwolf/USBaspLoader
https://www.obdev.at/products/vusb/usbasploader.html