attiny2313 usb client

attiny 12MHz로 일반 gpio를 이용 저속 usb 통신하는 녀석..

int0 / int1 인가.. gpio로 pd2 / pd3 일려나..

[링크 : http://codeandlife.com/2012/01/22/avr-attiny-usb-tutorial-part-1/]

[링크 : http://codeandlife.com/2012/01/25/avr-attiny-usb-tutorial-part-2/]

[링크 : http://codeandlife.com/2012/01/29/avr-attiny-usb-tutorial-part-3/]

[링크 : http://codeandlife.com/2012/02/04/avr-attiny-usb-tutorial-part-4/]

USBtiny is a software implementation of the USB low-speed protocol for the Atmel ATtiny microcontrollers.

[링크 : http://dicks.home.xs4all.nl/avr/usbtiny/]

V-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.

[링크 : https://www.obdev.at/products/vusb/index.html]