pyserial script doesnt execute properly

kishore kishoreinme at gmail.com
Tue Mar 9 16:42:21 CET 2010


On Mar 9, 8:01 pm, kishore <kishorei... at gmail.com> wrote:
> On Mar 9, 2:19 pm, News123 <news... at free.fr> wrote:
>
>
>
> > Hi,
>
> > kishore wrote:
> > > hello there
>
> > > Iam using python 2.5.4
> > > pyserial  2.4
> > > pywin32-214
>
> > > on windows 7
>
> > > i hav a small test script written to query a serial device (arduino)
> > > and get back reply appropriately
>
> > > ////file: test.py
>
> > > import serial
> > > print 'hi'
> > > ser=serial.Serial(port='\\.\COM2', baudrate=9600)
> > > ser.close()
> > > ser.open()
> > > ser.write('1')
> > > ser.readline()
> > > ser.readline()
> > > ser.close()
>
> > > the device waits for '1' through its serial interface and print two
> > > lines if it gets '1'
>
> > > "Some Data found" and "Header received"
>
> > > the script works on IDLE well when given one line at a time
>
> > > but when given in command line as python test.py it prints hi and wait
> > > forever
>
> > Unfortunately I don't remember exacty, but try following:
>
> > close IDLE and try then to start the script from the command line.
> > I remember having had a problem with idle, that it did not always close
> > the UART port
> > (especially, when an error (e.g. syntax) occured before the close statement)
>
> > bye
>
> > N
>
> Thanks for your response
> i tried closing idle and the following code prints
> port opened
> Write failed
>
> code:
>
> import serial
> import time
> ser=serial.Serial(port='\\.\COM2', baudrate=9600)
> if ser:
>         print 'port opened'
> ser.open()
> if ser.write('1'):
>         print 'Write success'
> else:
>         print 'write failed'
>
> time.sleep(1)
>
> a=ser.readline()
> time.sleep(1)
> b=ser.readline()
> print b
> ser.close()
>
> I believe this might be a serial port access error.
> how to solve this?
> Any suggestions?

have found one more person with same problem but no solution

http://mail.python.org/pipermail/python-win32/2009-January/008613.html



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