pyserial

[Mimi]

Hi,
I use the pyserial to read data from a serial port.
My code is in window Xp and python 2.4. when I use Hyperteminal I can
read data without try and try again that it is not the case with
pyserial library.
anyone can help me ?
this is a part of my code:

self.ser = serial.Serial()
self.ser.baudrate = 9600
self.ser.port = 3
self.ser.timeout= 10
self.ser.bytesize = serial.EIGHTBITS
self.ser.stopbits = serial.STOPBITS_ONE
self.ser.xonxoff = 0

   nbHisto = 144
   for i in range(0,nbHisto):
while 1:
print self.ser.flushInput()
print self.ser.flushOutput()
cmd = "%xs\r" %(i+1)
self.ser.write("%s" %cmd)

#print cmd

histo = self.ser.readlines()
#print histo
if histo:
if histo=="\r\n":
pass
else:

histoAdresse = int(histo[0].strip('\r\n'))
print histoAdresse

try:
dateHisto_cur = listeFenetreNonNul["%s"
%(histoAdresse)]
print dateHisto_cur


self.ecrireHistoDansFic(histo,histoAdresse,dateHisto_cur,histoAdresse,i)
break
except:

print "Adresse pas trouvee dans le
systeme %s" %(histoAdresse)
break
# End if

sleep(10)
# End while
#End for


self.ser.close()

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Re: pyserial

[Mimi]

Thanks Peter,
 because you have understood my need: a little understanding of
readlines() function.

# Following snippets of code is running in infinitive loop, but it is
not
   necessary too be worried about processor utilization because the
   readline waits for the data on the serial port and the code
continues
   to run when data occurs or when timeout passes.
#

my python script tries to read a lot of data (the histograms)  and that
can take many times (3 min) to download one file. and data do not
arrived in the same time you can wait few seconds between data ( data
response for the same command).
do you think that readlines() function will wait until all data are
arrived or when the timeout expired ?
if the data take more time, the readlines() will wait or will break on
the timeout ?
with hyperterminal the data are echoed when they arrived and you can
see that they do not arrived all the same time.
the timeout is reset when the first data arrived or it is only ignored
?

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Re: pyserial

[Mimi]

thanks philippe,
Hi will take care for the that.

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