s3c44b0 uclinux gpio驱动测试程序。程序每隔一秒扫描一次相应的gpio，我的开发板上是几个按键，如果有按键按下则显示按下的按键号。-s3c44b0 uclinux gpio driver testing procedures. Procedures at intervals of one second to scan a corresponding gpio, my board is the development of a few keys, if the button pr