参考资料：

[Serial Programming Guide for POSIX Operating Systems]  https://digilander.libero.it/robang/rubrica/serial.htm

[Linux串口编程]  https://www.cnblogs.com/feisky/archive/2010/05/21/1740893.html

[Linux串口—struct termios结构体]

https://blog.csdn.net/yemingzhu163/article/details/5897156

https://www.cnblogs.com/sky-heaven/p/9675253.html