python pty模块 – 作用1 – 虚拟一个串口

2022年 11月 5日

python pty模块 – 作用1 – 虚拟一个串口

pty模块是一个虚拟终端库。也可以虚拟出一个串口。
在嵌入式开发过程中，你一定有这样一种需求：想在虚拟机上调试串口的通信。
那么这个pty库是可以满足你的需求的。

#coding=utf-8

import pty
import os
import select

def mkpty():
    #Open a new tty
    master1, slave = pty.openpty()
    slaveName1 = os.ttyname(slave)
    master2, slave = pty.openpty()
    slaveName2 = os.ttyname(slave)


    print ('\nslave device names:', slaveName1, slaveName2)
    return master1, master2

if __name__ == "__main__":

    master1, master2 = mkpty()
    while True:
        #       rl=read list, wait until ready to reading
        #       wl=write list, wait until ready to writing
        #       el=exception list, wait for an "exceptional condition"
        #       timeout = 1s

        rl, wl, el = select.select([master1, master2], [], [], None)
        for device in rl:
            data = os.read(device, 128)
            if device == master1:
                print("read from master1: %s" % (len(data), data))
                os.write(master2, data)
            else:
                os.write(master1, data)