3、系统定时器SysTick

代码说明：

说明：  这是基于开发板LPC1114的源码程序，是用C语言编写，用于实现系统定时器的配置同时它也是一个完整的模板，可以在此基础上添加其他程序用于开发板的学习，是一个完整的模板，可直接使用。(This is a source code program based on the development board LPC1114. It is written in C language. It is used to realize the configuration of the system timer. At the same time, it is also a complete template. On this basis, other programs can be added for the learning of the development board. It is a complete template and can be used directly.)