嵌入式linux按键驱动程序及相关的测试程序，通过定时器定时扫描GPIO电平的高低以判定按键是否按键，通过延时去抖-Embedded linux key drivers and test procedures, by the level of timer scheduled scans the GPIO to determine whether a key button debounce with delay

简单的按键linux驱动程序，里面有两种模式，一种是扫描模式，一种是中断模式。中断模式是按键驱动led-Simple key linux driver, there are two modes, a scan mode, one is the interrupt mode. The interrupt mode key driver led