[Tutor] how to read over serial port

[shawn bright]

ok, i have another question:
if i run this:
#!/usr/bin/env python
f = 'test_out'
f = open(f, 'r').read()
for i in f:
    print ord(i)

I get this:
0
6
0
58
128
31
22
103
74
115
222
192
74
115
222
192  (deleted some in the email for brevity)

if i do
for i in f:
    print chr(ord(i))
i get the same weird characters.
should these be read some other way?

thanks,
shawn




On Mon, Nov 3, 2008 at 8:14 AM, shawn bright <nephish at gmail.com> wrote:
> Hey all, sorry, but am i supposed to be using 'rb' to read this?
> thanks
>
> sk
>
> On Sun, Nov 2, 2008 at 11:50 AM, shawn bright <nephish at gmail.com> wrote:
>> Thanks all,
>> Yeah, checked the settings, and when i have the thing talk to a
>> program that just prints out whatever the serial port reads, It was
>> looking fine.
>> Incorrect baudrate was my first problem, and did cause weirdness,
>> escpeially on the latter end of the message, but this isn't the same
>> problem. Just don't know how to read it.
>> thanks
>>
>> shawn
>>
>>
>> On Sun, Nov 2, 2008 at 9:38 AM, Brian C. Lane <bcl at brianlane.com> wrote:
>>> -----BEGIN PGP SIGNED MESSAGE-----
>>> Hash: SHA1
>>>
>>> shawn bright wrote:
>>>> Hey there all,
>>>>
>>>> I have a gps device that talks to the computer over a serial port.
>>>> i am using the pyserial module and getting values in.
>>>
>>> Here are the relevant bits of a serial to tcp/ip app that I use. Most
>>> likely you have the wrong baudrate set. If it is an older GPS device the
>>> baudrate will be 4800, newer devices allow you to set it to higher
>>> speeds, 9600 being standard. Check the device settings to make sure that
>>> it doesn't have any weird parity settings too. 8 bits, No Parity, 1 stop
>>> bit is common.
>>>
>>>
>>> import sys
>>> import serial
>>>
>>> port = "/dev/ttyS0"
>>> baud = 9600
>>>
>>> ser = serial.Serial()
>>> ser.port = port
>>> ser.baudrate = baud
>>>
>>> try:
>>>    ser.open()
>>> except:
>>>    sys.stderr.write("Error opening serial port %s\n" % (ser.portstr) )
>>>    sys.exit(1)
>>>
>>> ser.setRtsCts(0)
>>>
>>> while 1:
>>>    # Read from serial port, blocking
>>>    data = ser.read(1)
>>>
>>>    # If there is more than 1 byte, read the rest
>>>    n = ser.inWaiting()
>>>    if n:
>>>        data = data + ser.read(n)
>>>
>>>    sys.stdout.write(data)
>>>
>>>
>>>
>>> - --
>>> - ---[Office 68.7F]--[Outside 51.0F]--[Server 103.2F]--[Coaster 70.0F]---
>>> - ---[       TACOMA WSF (366772760) @ 47 36.3260 -122 23.1697       ]---
>>> Software, Linux, Microcontrollers             http://www.brianlane.com
>>> AIS Parser SDK                                http://www.aisparser.com
>>>
>>> -----BEGIN PGP SIGNATURE-----
>>> Version: GnuPG v1.4.8 (Darwin)
>>> Comment: Remember Lexington Green!
>>>
>>> iD8DBQFJDcl3Iftj/pcSws0RAs2+AJ91ynHgzdXDfVpbh37iM7XITnDI7wCeNON8
>>> qxyWcuc5opuOpeRCJ6cWr+o=
>>> =fPs4
>>> -----END PGP SIGNATURE-----
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>>
>