linux串口编程有用网址

https://www.xanthium.in/Serial-Port-Programming-on-Linux
https://www.cnblogs.com/we-hjb/p/UART7.html
https://github.com/xanthium-enterprises
https://blog.csdn.net/wheelfjl/article/details/52758251
https://www.xanthium.in/USB-to-Serial-RS232-RS485-Converter
https://digilander.libero.it/robang/rubrica/serial.htm#CONTENTS
Linux下的串口编程及非阻塞模式
https://www.cnblogs.com/ynxf/p/6105072.html

linux下串口的阻塞和非阻塞操作
https://blog.csdn.net/wuhengwudi/article/details/7454629

https://blog.csdn.net/xieyi2015/article/details/51114110
linux串口编程–规范模式和非规范模式及read的阻塞与非阻塞

https://blog.csdn.net/u010871058/article/details/70142044
Linux 串口 一次性read接收不定长的数据（非阻塞,非延时） 程序分析