Add support for AVR XMEGA

[ivankravets]

Moved from https://github.com/platformio/platformio/issues/481

/cc @knutel, @aethaniel

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It would be great to have support for AVR XMEGA, too. There already is a project to make Arduino support at [https://github.com/Xmegaduino/Xmegaduino], so maybe PlatformIO support is not that difficult. I might take a stab at it myself if I get the time.

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[corymayer]

Instead of porting the Arduino libraries would it be possible to use the standalone Atmel Software Framework? It's currently compatible with the XMEGA family and builds with avr-gcc.

http://www.atmel.com/tools/avrsoftwareframework.aspx

[DaSimme]

Any progress on this?

There is the project for Arduino IDE: https://github.com/XMegaForArduino/arduino But would be cool to just add it to platform.io

[she11sh0cked]

Are there still any plans to add support for the XMEGA boards?