用python虚拟串口

tyxiayu

　　在linux下调试串口程序，无奈下面的硬件还没到位，所以，想着自己模拟一个串口用用。试了下下面这段代码：



#!/usr/bin/env python
#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], [], [], 1)
for device in rl:
data = os.read(device, 128)
print "read %d data."%len(data)
if device == master1:
os.write(master2, data)
else:
os.write(master1, data)
　　pty是假串口的意思，但是支持硬件串口的所有操作。so。。。
　　另外一个，模拟同事通过串口发来的数据。所有写到master的数据，都被自动的发往slave。所以，我们在slave这边就可以收到想要的数据。



#!/usr/bin/env python
#coding=utf-8
import pty
import os
import time
import array
import random
def mkpty():
#make pair of pseudo tty
master, slave = pty.openpty()
slaveName = os.ttyname(slave)
print '\nslave device names:', slaveName
return master
if __name__ == "__main__":
master = mkpty()
buf = array.array('B', [0] * 7)
buf[0] = 0x00
buf[1] = 0x02
buf[2] = 0x8a
buf[3] = 0x2d
buf[4] = 0xc5
buf[5] = 0x3f
buf[6] = 0x00
while True:
if buf[1] < 40:
buf[1] = buf[1] + 1
else:
buf[1] = 1
buf[0] = buf[0] + 1
if buf[0] == 255:
buf[0] = 0
#        buf[5] = random.randint(40,50)
buf[2] = random.randint(0,250)
buf[6] = ( buf[0]+buf[1]+buf[2]+buf[3]+buf[4]+buf[5]) %256
os.write(master,  buf)
#        print buf
time.sleep(0.02)