在cc2430上实现了一个分压按键，通过用用a/d口测量按键输出端的电压值来判断哪个按键被按下。共四个按键，用一个范围确定某一个具体的按键是否被按下。-In cc2430 implements a partial pressure buttons, through with the use of a/d oral measuring key output voltage value to determine which key was pressed. A total of four butto