python 对串口的操作

我用的是“线程轮寻”方式。

就是打开串口后，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(也可以发送一个事件，并携带接收到的数据)。

我没有用到串口处理太深的东西。

客户的原程序不能给你，不过我给你改一下吧。

里面的一些东西，已经经过了处理，要运行，可能你要自己改一下，把没有用的东西去掉。

我这里已经没有串口设备了，不能调了，你自己处理一下吧，不过基本的东西已经有了。

=================================================================

#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.WriteText(u'打开通讯端口\r\n');

if not self.log is None:

self.log.info(u'打开通讯端口');

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(u'出错：\r\n %s\r\n' % ex);

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(u'创建接收任务\r\n');

if not self.log is None:

self.log.info(u'创建接收任务');

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(u'通讯端口未打开\r\n');

if not self.log is None:

self.log.info(u'通讯端口未打开');

return False;

def InitHead(self):

#串口的其它的一些处理

try:

time.sleep(3);

if not self.output is None:

self.output.WriteText(u'数据接收任务开始连接网络\r\n');

if not self.log is None:

self.log.info(u'数据接收任务开始连接网络');

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(u'出错：\r\n %s\r\n' % ex);

if not self.log is None:

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

self.SetStopEvent();

return;

if not self.output is None:

self.output.WriteText(u'开始接收数据\r\n');

if not self.log is None:

self.log.info(u'开始接收数据');

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

def SendData(self, i_msg):

lmsg = '';

isOK = False;

if isinstance(i_msg, unicode):

lmsg = i_msg.encode('gb18030');

else:

lmsg = i_msg;

try:

#发送数据到相应的处理组件

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(u'关闭通迅端口：[%d] \r\n' % self.port);

if not self.log is None:

self.log.info(u'关闭通迅端口：[%d]' % self.port);

def printHex(self, s):

s1 = binascii.b2a_hex(s);

print s1;

#测试用部分

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;