On 9/13/2010 8:36 AM Markus Hubig said...
Hi @all!
I'm about to write a class for serial communication on Win32 and Linux which
provides a method called "talk" to send something over the serial line,
wait for
the answer and returns it. My problem is, that I don't know how long the
answer
will be (ok max 260 bytes but most answers are much smaller).
This is what I have now, please leave some comments:
1. Will this work on Win32 (with select)?
2. Should I better use twisted.internet.serialport?
3. Will self.read(260)block until it reads the full 260 bytes?
You're subclassing Serial -- the answers to your questions depend on
what that is. So, what is it? Does it support windows? Has anyone
compared/contrasted it to twisted.internet.serialport? What does its
read do? And finally, perhaps, does it have it's own support
group/list? You'll probably get better answers directly from there than
here.
HTH,
Emile
class SerialDevice(Serial):
def __init__(self,port):
Serial.__init__(self)
self.port = port
self.baudrate = 57600
self.bytesize = EIGHTBITS
self.parity = PARITY_ODD
self.stopbits = STOPBITS_TWO
self.timeout = 0
self.xonxoff = 0
self.rtscts = 0
self.dsrdtr = 0
self.open()
self.flush()
def _write(self, packet):
fileno = self.fileno()
while True:
readable, writeable, excepts = select( [], [fileno], [], 0.2 )
if fileno in writeable:
time.sleep(0.1)
length = self.write(packet)
break
return length
def _read(self):
fileno = self.fileno()
while True:
readable, writeable, excepts = select( [], [fileno], [], 0.2 )
if fileno in readable:
time.sleep(0.1)
packet = self.read(260)
break
return packet
def talk(self, packet):
self._write(packet)
responce = self._read()
return responce
Thank you, Markus
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