Atmel xmega系列官方flash自编程应用参考代码，使用GCC编译器-official reference code of flash self-programming application based on Atmel xmega series , use the GCC compilerr

gcc编程，通关在GCC上的动手实验，了解编译器的基本构造与功能,gcc在编译原理中的使用-GCC programming, clearance in the hands of the GCC experiments, to understand the basic structure and function of the compiler。The use of GCC in compiling principle