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https://github.com/marcelomd/mux_serial
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http://dev.emcelettronica.com/serial-port-communication-c
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http://www.recursion.jp/avrcdc
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http://www.e.kth.se/~pontusf/index2.html
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http://www.coolcircuit.com/project/atmel_isp/index.html
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http://web.mac.com/mr.pirate/SpikenzieLabs/USB_to_Serial.html
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http://www.scienceprog.com/diy-usb-to-rs232-adapter