AT91SAM9263官方LED闪烁裸机测试程序。文件包括main.c, low_level.c, cstartup.S, Makefile, 一系列头文件等。(The official AT91SAM9263 LED flashing bare metal test program. The files include main.c, low_level.c, cstartup.S, Makefile, a series of header files, and so on.)