本案例适用于现有的串口控件不满足需求的情况。例如对串口数据需要高度自定义，亦或者是需要额外用USB口扩串口的情况。下面将对这方面做相关的讲解，对应案例于 自定义串口
引入头文件
如果是标准的屏幕自带的串口 COM1对应ttyS1 COM2对应ttyS3 COM3对应ttyS2
如果是用USB扩展的串口 插入设备后就会在/dev目录下生成ttyUSB0、ttyUSB1等类似设备
此处是进行串口数据读写的封装函数
操作使用
声明
初始化
数据发送
在任意地方进行数据发送
数据接收
数据接收处可以高度自定义 可以按照接收的数据格式进行自定义读取和解析。把接收放在公共页后台异步线程里面
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