问题描述
我一直在从事 Arduino/Raspberry Pi 项目，我发现自己不仅在学习 Python，还学习 Twisted Python；所以我提前为我的新手道歉.我现在尽量保持简单，只是尝试在两个设备之间的任何时间发送一个字符.
I have been working on an Arduino/Raspberry Pi project where I have found myself learning not just Python but Twisted Python as well; so I apologize in advance for my newbness. I am trying to keep it simple for now and just trying to send a char at any one time between the two devices.
到目前为止，我能够从 Raspberry Pi 向 Arduino 发送数据，并按预期有效地关闭/打开其 LED.但是，我似乎无法生成 Twisted 代码来检测从 Arduino 到串行端口上的 RPi 的任何内容.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.
So far I am able to send from the Raspberry Pi to the Arduino and effectively turn its LED off/on just as expected. However I cannot seem to generate Twisted code which will detect anything coming from the Arduino to the RPi on the serial port. I verified that the Arduino is sending chars every 2 seconds with a serial monitor application in the Arduino programmer running on the RPi.
下面的代码在 RPi 上运行，接收 GET 请求并通过串行端口将部分数据传递给 Arduino.不过，我似乎无法让这段代码监听同一个串行端口.:/我已经为此工作了一个多月，似乎被卡住了.我似乎无法找到一个在线 Twisted Python 接收串行数据的好例子；或者至少是我理解的一个例子.无论如何，这是我到目前为止所拥有的:
The code below runs on the RPi, receives a GET request and passes some of that data through the serial port to the Arduino. I cannot seem to get this code to listen to that same serial port though. :/ I have been working on this for a bit over a month and seem to be stuck. I just cannot seem to find a good example for Twisted Python online to receive serial data; or at least an example that I understand. Anyway here is what I have so far:
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()
正如您所见，代码只是在串行端口上寻找任何东西，但我似乎无法让这种魔法发生.提前致谢，感谢您的帮助！
As you can see the code is just looking for anything on the serial port but I can't seem to make that magic happen. Thanks in advance, any help is appreciated!
推荐答案
由此判断:http://twistedmatrix.com/trac/browser/tags/releases/twisted-12.3.0/twisted/internet/_win32serialport.py#L84 你应该查看协议子类的 dataReceived(self,...) 方法
Judging from this: http://twistedmatrix.com/trac/browser/tags/releases/twisted-12.3.0/twisted/internet/_win32serialport.py#L84 you should be looking at dataReceived(self,...) method of your Protocol subclass
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)
试试这个看看它是否有效.
try this to see if it works.
这篇关于Raspberry Pi (Debian) 上的 Twisted Python 脚本通过 USB 与 Arduino 通信的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持跟版网！