Raspberry Pi（Debian）上的Twisted Python脚本通过USB与Arduino通信

Question

我一直在从事一个Arduino/Raspberry Pi项目，在这个项目中，我发现自己不仅学习Python，还学习Twisted Python；因此，我提前为我的新手道歉。我现在尽量保持简单，只想在两个设备之间的任何时候发送一个字符。在

到目前为止，我能够从树莓派派到阿尔杜诺，并有效地关闭了它的LED灯，正如预期的那样。然而，我似乎不能生成扭曲的代码来检测从Arduino到串行端口上的RPi的任何东西。我通过在RPi上运行的Arduino程序员中的串行监视器应用程序验证了Arduino每2秒发送一次字符。在

下面的代码在RPi上运行，接收一个GET请求，并通过串行端口将部分数据传递给Arduino。但我似乎无法让这些代码监听同一个串行端口。：/我已经为此工作了一个多月了，似乎被卡住了。我只是似乎找不到Twisted Python在线接收串行数据的好例子；或者至少找一个我理解的例子。不管怎样，到目前为止我所掌握的是：

import sys
from urlparse import urlparse
from twisted.web import server, resource
from twisted.internet import reactor
from twisted.internet.protocol import Factory, Protocol
from twisted.internet.serialport import SerialPort

serServ = None

class USBclient(Protocol):
    def connectionMade(self):
        global serServ
        serServ = self
        print 'Arduino device: ', serServ, ' is connected.'

    def cmdReceived(self, cmd):
        serServ.transport.write(cmd)
        print cmd, ' - sent to Arduino.'
        pass

    def serialReadEvent(self):      #maybe it should be: doRead()? Couldn't get either to work.
        print 'data from arduino is at the serial port!'

class HTTPserver(resource.Resource):
    isLeaf = True
    def render_GET(self, request):      #passes the data from the get request
        print 'HTTP request received'
        myArduino = USBclient()
        stringit = str(request)
        parse = stringit.split()
        command, path, version = parse
        myArduino.cmdReceived(path)

class cmdTransport(Protocol):
    def __init__(self, factory):
        self.factory = factory

class cmdTransportFactory(Factory):
    protocol = cmdTransport

if __name__ == '__main__':
    HTTPsetup = server.Site(HTTPserver())
    reactor.listenTCP(5000, HTTPsetup)
    SerialPort(USBclient(), '/dev/ttyACM0', reactor, baudrate='115200')
    reactor.run()

正如你所看到的，代码只是在串行端口上寻找任何东西，但我似乎不能让这种神奇发生。提前谢谢，任何帮助都将不胜感激！在

Answer 1

由此判断：http://twistedmatrix.com/trac/browser/tags/releases/twisted-12.3.0/twisted/internet/_win32serialport.py#L84您应该查看Protocol子类的dataReceived（self，…）方法

因此：

class USBclient(Protocol):
    def connectionMade(self):
        global serServ
        serServ = self
        print 'Arduino device: ', serServ, ' is connected.'

    def cmdReceived(self, cmd):
        serServ.transport.write(cmd)
        print cmd, ' - sent to Arduino.'
        pass

    def dataReceived(self,data):      
        print 'USBclient.dataReceived called with:'
        print str(data)

试试这个看看能不能用。在