如何用python写串口通信软件_如何用python写个串口通信的程序？

展开全部

打开串口后启动一个线程来监听串口数据的进入，有数据时，就做数据的处理。

用python写串口通信e68a84e8a2ad3231313335323631343130323136353331333365633839程序的示例：

#coding=gb18030

import sys,threading,time;

import serial;

import binascii,encodings;

import re;

import socket;

class ReadThread:

def __init__(self, Output=None, Port=0, Log=None, i_FirstMethod=True):

self.l_serial = None;

self.alive = False;

self.waitEnd = None;

self.bFirstMethod = i_FirstMethod;

self.sendport = '';

self.log = Log;

self.output = Output;

self.port = Port;

self.re_num = None;

def waiting(self):

if not self.waitEnd is None:

self.waitEnd.wait();

def SetStopEvent(self):

if not self.waitEnd is None:

self.waitEnd.set();

self.alive = False;

self.stop();

def start(self):

self.l_serial = serial.Serial();

self.l_serial.port = self.port;

self.l_serial.baudrate = 9600;

self.l_serial.timeout = 2;

self.re_num = re.compile('\d');

try:

if not self.output is None:

self.output.WriteTex;

if not self.log is None:

self.log.info;

self.l_serial.open();

except Exception, ex:

if self.l_serial.isOpen():

self.l_serial.close();

self.l_serial = None;

if not self.output is None:

self.output.WriteText;

if not self.log is None:

self.log.error(u'%s' % ex);

return False;

if self.l_serial.isOpen():

if not self.output is None:

self.output.WriteText;

if not self.log is None:

self.log.info;

self.waitEnd = threading.Event();

self.alive = True;

self.thread_read = None;

self.thread_read = threading.Thread(target=self.FirstReader);

self.thread_read.setDaemon(1);

self.thread_read.start();

return True;

else:

if not self.output is None:

self.output.WriteText;

if not self.log is None:

self.log.info;

return False;

def InitHead(self):

try:

time.sleep(3);

if not self.output is None:

self.output.WriteText;

if not self.log is None:

self.log.info;

self.l_serial.flushInput();

self.l_serial.write('\x11');

data1 = self.l_serial.read(1024);

except ValueError,ex:

if not self.output is None:

self.output.WriteText;

if not self.log is None:

self.log.error(u'%s' % ex);

self.SetStopEvent();

return;

if not self.output is None:

self.output.WriteText;

if not self.log is None:

self.log.info;

self.output.WriteText(u'===================================\r\n');

def SendData(self, i_msg):

lmsg = '';

isOK = False;

if isinstance(i_msg, unicode):

lmsg = i_msg.encode('gb18030');

lmsg = i_msg;

pass

except Exception, ex:

pass;

return isOK;

def FirstReader(self):

data1 = '';

isQuanJiao = True;

isFirstMethod = True;

isEnd = True;

readCount = 0;

saveCount = 0;

RepPos = 0;

#read Head Infor content

self.InitHead();

while self.alive:

try:

data = '';

n = self.l_serial.inWaiting();

if n:

data = data + self.l_serial.read(n);

#print binascii.b2a_hex(data),

for l in xrange(len(data)):

if ord(data[l])==0x8E:

isQuanJiao = True;

continue;

if ord(data[l])==0x8F:

isQuanJiao = False;

continue;

if ord(data[l]) == 0x80 or ord(data[l]) == 0x00:

if len(data1)>10:

if not self.re_num.search(data1,1) is None:

saveCount = saveCount + 1;

if RepPos==0:

RepPos = self.output.GetInsertionPoint();

self.output.Remove(RepPos,self.output.GetLastPosition());

self.SendData(data1);

data1 = '';

continue;

except Exception, ex:

if not self.log is None:

self.log.error(u'%s' % ex);

self.waitEnd.set();

self.alive = False;

def stop(self):

self.alive = False;

self.thread_read.join();

if self.l_serial.isOpen():

self.l_serial.close();

if not self.output is None:

self.output.WriteText;

if not self.log is None:

self.log.info;

def printHex(self, s):

s1 = binascii.b2a_hex(s);

print s1;

if __name__ == '__main__':

rt = ReadThread();

f = open("sendport.cfg", "r")

rt.sendport = f.read()

f.close()

try:

if rt.start():

rt.waiting();

rt.stop();

else:

pass;

except Exception,se:

print str(se);

if rt.alive:

rt.stop();

print 'End OK .';

del rt;

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