keyleduart

说明：  自己编写的一部分完整代码，是学习arm9的好工具，这个程序是针对s3c2440的。能够实现按键检测，led显示和串口的打印。(I have written part of the complete code, is a good tool for learning arm9, this program is for s3c2440' s. To achieve key detection, led display and print the serial port.)