我一直在做一个 Arduino/Raspberry Pi 项目,我发现自己不仅在学习 Python,而且还在学习 Twisted Python;所以我提前为我的新手道歉。我现在试图保持简单,只是尝试在两个设备之间的任何时间发送一个字符。
到目前为止,我能够从 Raspberry Pi 发送到 Arduino 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。
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:
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()
正如您所看到的,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。在此先感谢,任何帮助表示赞赏!