Am 09.02.2011 22:26, schrieb Lukas Siebicke:
Hello,
Hello Lukas,
I am trying to use a Lawicel CANUSB dongle (www.canusb.com) with
socketcan on Ubuntu but without success.
First I tested the communication with cutecom and that worked fine. To
use socketcan I have followed the instructions in a previous thread
(http://old.nabble.com/Some-problems-with-CANUSB-and-Ubuntu-8.04-9.04-td24621697.html)
which explained how to use the CANUSB hardware successfully with Ubuntu
9.04. Since I got make errors for socketcan in Ubuntu 10.10 (kernel
2.6.35) I tried with a fresh install of Ubuntu 9.04 using the same
kernel (2.6.28-11) as in the above mentioned tutorial post.
I think this part here is inthe tutorial pretty wrong:
8. Get serial interface "ttyUSB0" to networksocket "slc0"
---------------------------------------------------------
- slcan_attach -o -s6 /dev/ttyUSB0
- slcand ttyUSB0
- ifconfig slc0 up
Now, here comes the problem:
Everything seems fine until the point where I can not bring slcan0 up,
not with
$ ifconfig slcan0 up
SIOCSIFFLAGS: no such device
(..)
$ slcan_attach -o -s6 /dev/ttyUSB0
attached tty /dev/ttyUSB0 to netdevice slcan0
$ slcand ttyUSB0
$ ip link set slcan0 type can
$ ifconfig slcan0 up
or
$ ip link set slcan0 up
here I get above reported error: no such device.
However,
$ ip link show slcan0
and
$ ifconfig -a
tell me that slcan0 exists but the state is DOWN.
I assume the problem when using both
- slcan_attach
- slcand
at the same time.
slcan_attach is a tool that can be used to attach the line discipline
from a terminal.
In your case, you attach the line discipline and then close the file
descriptor which kills it again. To omit this close, add a '-w' to the
slcan_attach (as shown in the help text).
Then you need to use a different terminal to continue :-)
The *other* way is to use slcand that runs as a daemon in the
background. Don't use both of these tools at the same time.
In general it's a good idea to play with a standard terminal programm
(e.g. minicom) on /dev/ttyUSB0 first, to check whether the CANUSB works
as expected when receiving CAN frames.
And when it does: Just type 'C' <enter> to close the adapter and quit
the terminal program. Then you can be sure that slcan_attach OR slcand
run in a working setup.
Regards,
Oliver
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