AVR-CDC
代码说明：
AVR-CDC converts USB and RS-232C signals using the AVR micro- controller which has no on-chip USB interface. This technology is based on Object Deveopment"s V-USB (Software-USB on AVR), and the CDC (Communication Device Class) protocol was extended over it. AVR-CDC enables PC to communicate with the USB device through virtual COM port.The basic idea of using CDC protocol over Low-speed USB is based on Kyosuke Ishikawa"s experiment in 2005. To make it stable and practical, Christian Starkjohann in Object Development helped me modifying his V-USB stack. Since three endpoints and the bulk transfer on low-speed device violates the USB standard, I added a tiny patch driver on Windows" USB stack.Although this technology is quite experimental, it may be useful to interface your original system to PC eas
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