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python读取串口数据

发布时间: 2021-03-07 15:26:36

① linux中python怎么打开串口

一个Python实现的串口Echo
import serial
import sys
try:
ser = serial.Serial('/dev/ttyUSB0', 9600)
except Exception, e:
print 'open serial failed.'
exit(1)
print 'A Serial Echo Is Running...'
while True:
# echo
s = ser.read()
ser.write(s)
# write to stdout and flush it
sys.stdout.write(s)
sys.stdout.flush()

② stm32用串口上传数据我怎么用Python读取

可以使用串口模块serial读取

③ 如何用python写个串口通信的程序

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。

④ 如何用python写个串口通信的程序

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;

⑤ python怎么读取串口AT命令的返回值

安装一个pyseries包。然后找一个AT标准的命令集。似乎有人封装好了。我以前见过。

然后剩下的事情就超简单了。测试通过就可以用。

好象以前是用这个做运维时，给运维人员发短信用的。这个功能十几年前就成熟了。现在都应该有现成的python模块。

⑥ Python如何进行多串口通信一个串口控制电机一个串口采集数据

下载 pyserial包
def OpenCom(self,*args): #设置端口和波特率 selComPort =‘com2’ #波特率 selBaudRate =9600 #奇偶校验 selParity = 'N' try: if(not self.mySerial): self.mySerial = serial.Serial(port=selComPort, baudrate=selBaudRate,bytesize=8,parity=selParity,stopbits=1,timeout=5) else: if(self.mySerial.isOpen()): self.mySerial.close() self.mySerial = serial.Serial(port=selComPort, baudrate=selBaudRate, bytesize=8, parity=selParity, stopbits=1, timeout=5) self.lblInfo['text'] = '打开成功！' except Exception as ex: self.lblInfo['text'] = '打开失败！'

#使用com口发送modbus协议给终端设备。
def btnEmId_Click(self):
barray = bytearray([0x05, 0x03, 0xA#, 0x54, 0x00, 0x08])
vOldEmId = self.txbOldEmId.get()
vNewEmId = self.txbNewEmId.get()
barray[0] = int(vOldEmId)
barray[5] = int(vNewEmId)
#crc校验
strInput = utils.crc16_append(barray)
print(barray)
n = self.mySerial.write(barray)
if(n > 0):
str = self.mySerial.readall()
self.lblInfo['text'] = 'success！'
# for s in str:
# print (hex(s))
else:
self.lblInfo['text'] = 'error！'

⑦ python获取串口设备的描述

importwinreg

key=winreg.OpenKey(winreg.HKEY_LOCAL_MACHINE,r"{36FC9E60-C465-11CF-8056-444553540000}")
foriinrange(winreg.QueryInfoKey(key)[0]):
subkey=winreg.OpenKey(winreg.HKEY_LOCAL_MACHINE,"SYSTEM\ControlSet001\Control\Class\{36FC9E60-C465-11CF-8056-444553540000}\"+winreg.EnumKey(key,i))
print(winreg.QueryValueEx(subkey,'DriverDesc'))
winreg.CloseKey(subkey)
winreg.CloseKey(key)

importwinreg

key=winreg.OpenKey(winreg.HKEY_LOCAL_MACHINE,r"")
try:
i=0
while1:
name,value,type=winreg.EnumValue(key,i)
print(repr(name),value)
i+=1
value,type=winreg.QueryValueEx(key,"EnableAutoTray")
exceptFileNotFoundError:
print
exceptOSError:
print

以前回答过一个，好像跟你说的意思差不多，都是读取注册表，一个读USB，一个是串口

⑧ 树莓派用python解析串口明文数据并分割问题，python大神请进！

你好，我也在研究将arino的数据传给树莓派保存并显示的项目，为什么你不用网口互联呢？

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