Thanks Dennis. In effect stringZVEI doesn't remain empty after the
.read method, then the loop is executed 1 time.
How could be a 'while' loop to wait a no empty string from the serial
port?
Dario.
Dennis Lee Bieber ha scritto:
> On 7 Sep 2005 07:14:37 -0700, "dario" <[EMAIL PROTECTED]> declaimed the
> following in comp.lang.python:
>
> > Hi, Im new on phyton programming.
> > On my GPRS modem with embedded Phyton 1.5.2+ version, I have to receive
> > a string from serial port and after send this one enclosed in an
> > e-mail.
> > All OK if the string is directly generated in the code. But it doesn't
> > works if I wait for this inside a 'while' loop. This is the simple
> > code:
> >
> First -- post the real code file would help -- the indentation of
> the first two statements below is wrong.
>
> > global stringZVEI
> >
> This does nothing at the top level -- if only makes sense INSIDE a
> "def" block, where it has the effect of saying "this variable is not
> local to the function"
>
> > while stringZVEI=='':
> > MOD.sleep(10)
>
> There is something wrong with
>
> import time
> time.sleep(<seconds>)
> ????
>
> > a=SER.send(' sono nel while stringZVEI==st vuota')
> > stringZVEI = SER.readbyte()
>
> #for debug
> print "%2X " % stringZVEI
>
> > a=SER.send(' stringZVEI=')
> > a=SER.send(stringZVEI)
> >
> > MOD and SER are embedded class maked by third part.
> >
> > >From my very little debug possibility it seem that loop is executed 1
> > time only nevertheless stringZVEI is still empty. The line
> > a=SER.send(' stringZVEI=')
> > work correctly but
> >
> > a=SER.send(stringZVEI)
> >
> What does .readbyte() do if there is no data to be read? Since your
> loop is based on a totally empty string, if .readbyte returns /anything/
> (even a "null" byte -- 0x00) your loop will exit; and a null byte may
> not be visible on the send...
>
> --
> > ============================================================== <
> > [EMAIL PROTECTED] | Wulfraed Dennis Lee Bieber KD6MOG <
> > [EMAIL PROTECTED] | Bestiaria Support Staff <
> > ============================================================== <
> > Home Page: <http://www.dm.net/~wulfraed/> <
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