cc2530定时器中断的程序，可以自己设定定时时间，可用于秒表的定时，定时非常准确-cc2530 timer interrupt program, you can set yourself regular time, can be used for stopwatch timing, timing is very accurate

配置交通灯的轮流点亮和使用Systick中断方式做延时定时器(Configure traffic lights in turn and use Systick interrupt mode to make delay timer.)