matlab读取串口数据，实时显示。
数据格式、串口设置可根据代码注释自定义
含test4与test5l两个例程，较为简单，后者需要开两个matlab(Do serial's data reading and real-time displaying by matlab, .
Data format and serial settings can be customized according to code comments
Containing test4 and test5l two routines, relatively simple, the latter needs to open two matlab)