pxa270实验板上的，数码管的测试程序，同过输入可以让数码管显示数字。-Experimental pxa270 panel, digital control of the test procedure, the same input can have a digital display figures.

pxa270下利用mmap函数实现LED控制的函数，直接在用户层操作具体的IO口来控制LED，推荐！-pxa270 next LED control function implementation using mmap functions operate directly on the user level of specific IO port to control the LED, recommended!