pyserial problem: script stops reading

Frederic Wenzel fred at osuosl.org
Mon Sep 11 20:08:32 CEST 2006


On 9/9/06, Frederic Wenzel <freeed at gmail.com> wrote:
> On 9/9/06, Hendrik van Rooyen <mail at microcorp.co.za> wrote:
> > | I wrote a script on Linux that uses pyserial to read status messages
> > | from a serial line using readlines(). For now, it just displays what
> > | it gets on stdout:
> > | (...)
> > | ser = serial.Serial(port=1,
> > |                                  baudrate=1200,
> > |                                  rtscts=1,
> > |
> > | If the script does not time out there, I am not sure what else it is
> > | doing. It seems to be in a wait state it does not get out of.

When it stopped working again (unfortunately) I pressed ctrl c and got
the following outputÖ

14:53 | 0008 | 02 |   | 5  |Rack Abs.|  -  | --752
14:53 | 0005 | 02 |   | 2  |Rack Abs.|  -  | 00752
14:53 | 0008 | 02 |Traceback (most recent call last):
  File "serialhandler.py", line 34, in ?
    lines = sh.readLines()
  File "serialhandler.py", line 29, in readLines
    return self.ser.readlines()
  File "/usr/lib/python2.3/site-packages/serial/serialutil.py", line
78, in readlines
    line = self.readline(eol=eol)
  File "/usr/lib/python2.3/site-packages/serial/serialutil.py", line
60, in readline
    c = self.read(1)
  File "/usr/lib/python2.3/site-packages/serial/serialposix.py", line
269, in read
    ready,_,_ = select.select([self.fd],[],[], self._timeout)
KeyboardInterrupt


Apparently this is the place where it gets stuck. The select.select
line does not return, not even for a timeout.

Fred



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