F2812上有两个事件管理器 EVA、EVB，本程序主要对事件管理定时器1和定时器2进行操作，目的是让用户熟悉EV事件管理器的编程方法。-F2812 has two events on Manager EVA, EVB, this process is essentially one of the event management and timer 2 timer to operate, the purpose is to enable users familiar with the even