Re: UnicodeDecodeError from tty.readline(), u-Blox 8
Gary said: > Weird... Since ttyACM0 is USB, maybe a driver thing. Yes, I'm using the USB port rather than the serial port. The question is: Which driver? Linux or U-Blox? -- These are my opinions. I hate spam. ___ devel mailing list devel@ntpsec.org https://lists.ntpsec.org/mailman/listinfo/devel
Re: UnicodeDecodeError from tty.readline(), u-Blox 8
Yo Hal!
On Sat, 03 Jun 2023 21:53:34 -0700
Hal Murray via devel wrote:
> Gary said:
> > To open to read binary:
> > tty = open("/dev/ttyACM0", "rb")
> > The line will be binary. Getting just the NMEA out will be fun.
>
> Thanks. That's what I needed.
Good.
> There is no problem getting just the NMEA. I'm using isASCII to
> detect the garbage cases.
Cool.
> I get things like:
> ### Not ASCII 2023 Jun 3, 22:46:41 UTC
> ###
> "$GLG\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\x
> cd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\
> xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd
> \xcd\xcd\xcd$GLGSV,3,3,11,87,43,333,,88,01,306,,90,13,029,*5A"
>
> I get several bogus lines each day. I haven't seen anything other
> then 0xcd in the non-ASCII part.
Weird... Since ttyACM0 is USB, maybe a driver thing.
RGDS
GARY
---
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g...@rellim.com Tel:+1 541 382 8588
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Re: UnicodeDecodeError from tty.readline(), u-Blox 8
Gary said:
> To open to read binary:
> tty = open("/dev/ttyACM0", "rb")
> The line will be binary. Getting just the NMEA out will be fun.
Thanks. That's what I needed.
There is no problem getting just the NMEA. I'm using isASCII to detect the
garbage cases.
I get things like:
### Not ASCII 2023 Jun 3, 22:46:41 UTC
### "$GLG\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\x
cd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\
xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd
\xcd\xcd\xcd$GLGSV,3,3,11,87,43,333,,88,01,306,,90,13,029,*5A"
I get several bogus lines each day. I haven't seen anything other then 0xcd
in the non-ASCII part.
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Re: UnicodeDecodeError from tty.readline(), u-Blox 8
Yo Hal!
On Mon, 29 May 2023 15:22:43 -0700
Hal Murray via devel wrote:
> Can somebody give me a lesson on this area?
>
> The code is:
> tty = open("/dev/ttyACM0")
> forever:
> line = tty.readline()
> a) How do I read mostly ASCII without crashing when there is
> non-ASCII?
To open to read binary:
tty = open("/dev/ttyACM0", "rb")
The line will be binary. Getting just the NMEA out will be fun.
> b) Why is a u-Blox LEA-M8T sending me non-ASCII crap?
Becasue it wants to. Becasue UBX is better than NMEA.
> This is coming from the USB port. It's running in NMEA mode.
> I don't think I have sent it any commands.
From u-blox8-M8_ReceiverDescrProtSpec_UBX-13003221.pdf:
"By default all ports are configured for UBX and NMEA protocols."
RGDS
GARY
---
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
g...@rellim.com Tel:+1 541 382 8588
Veritas liberabit vos. -- Quid est veritas?
"If you can't measure it, you can't improve it." - Lord Kelvin
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UnicodeDecodeError from tty.readline(), u-Blox 8
Can somebody give me a lesson on this area?
The code is:
tty = open("/dev/ttyACM0")
forever:
line = tty.readline()
a) How do I read mostly ASCII without crashing when there is non-ASCII?
b) Why is a u-Blox LEA-M8T sending me non-ASCII crap?
This is coming from the USB port. It's running in NMEA mode.
I don't think I have sent it any commands.
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