* how to check if can0 is up
@ 2015-05-04 19:10 vklein
2015-05-06 15:28 ` Oliver Hartkopp
0 siblings, 1 reply; 4+ messages in thread
From: vklein @ 2015-05-04 19:10 UTC (permalink / raw)
To: linux-can
Hi
I want to test the status of can0 on a BeagleBoneBlack with serial-can
cape from Logic Supply.
The interface is initialized with
ip link set can0 type can bitrate 250000
ifconfig can0 up
I have tried
cat /sys/class/net/can0/operstate
but this does not work correctly
if can0 is down, I get "down"
if can0 is up , I get "unknown"
ifconfig says:
can0 Link encap:UNSPEC HWaddr
00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
UP RUNNING NOARP MTU:16 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:10
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
Interrupt:55
help appreciated
Victor
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: how to check if can0 is up
2015-05-04 19:10 how to check if can0 is up vklein
@ 2015-05-06 15:28 ` Oliver Hartkopp
2015-05-07 7:59 ` Kurt Van Dijck
0 siblings, 1 reply; 4+ messages in thread
From: Oliver Hartkopp @ 2015-05-06 15:28 UTC (permalink / raw)
To: vklein, linux-can
Hi Victor,
On 05/04/2015 09:10 PM, vklein wrote:
> I want to test the status of can0 on a BeagleBoneBlack with serial-can cape
> from Logic Supply.
>
> The interface is initialized with
> ip link set can0 type can bitrate 250000
> ifconfig can0 up
Good.
> I have tried
> cat /sys/class/net/can0/operstate
> but this does not work correctly
>
> if can0 is down, I get "down"
>
> if can0 is up , I get "unknown"
The question is whether operstate is always set correctly ...
> ifconfig says:
> can0 Link encap:UNSPEC HWaddr
> 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
> UP RUNNING NOARP MTU:16 Metric:1
> RX packets:0 errors:0 dropped:0 overruns:0 frame:0
> TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:10
> RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
> Interrupt:55
>
What does
ip -det link show can0
tell you?
Using the 'ip' tool is recommended to get the device state.
Maybe the setting of the operstate in sysfs has to be fixed ?!?
Regards,
Oliver
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: how to check if can0 is up
2015-05-06 15:28 ` Oliver Hartkopp
@ 2015-05-07 7:59 ` Kurt Van Dijck
2015-05-07 11:44 ` vklein
0 siblings, 1 reply; 4+ messages in thread
From: Kurt Van Dijck @ 2015-05-07 7:59 UTC (permalink / raw)
To: vklein; +Cc: Oliver Hartkopp, linux-can
Hey,
--- Original message ---
> On 05/04/2015 09:10 PM, vklein wrote:
>
> > I want to test the status of can0 on a BeagleBoneBlack with serial-can cape
> > from Logic Supply.
> >
> > The interface is initialized with
> > ip link set can0 type can bitrate 250000
> > ifconfig can0 up
>
> Good.
>
> > I have tried
> > cat /sys/class/net/can0/operstate
> > but this does not work correctly
> >
> > if can0 is down, I get "down"
> >
> > if can0 is up , I get "unknown"
>
> The question is whether operstate is always set correctly ...
>
> > ifconfig says:
> > can0 Link encap:UNSPEC HWaddr
> > 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
> > UP RUNNING NOARP MTU:16 Metric:1
> > RX packets:0 errors:0 dropped:0 overruns:0 frame:0
> > TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
> > collisions:0 txqueuelen:10
> > RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
> > Interrupt:55
> >
>
> What does
>
> ip -det link show can0
>
> tell you?
>
> Using the 'ip' tool is recommended to get the device state.
I agree that 'ip' is the recommended way.
ip is an interactive tool.
To access it from c code, I wrote myself a library with example code:
https://github.com/kurt-vd/enumif
regards,
Kurt
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: how to check if can0 is up
2015-05-07 7:59 ` Kurt Van Dijck
@ 2015-05-07 11:44 ` vklein
0 siblings, 0 replies; 4+ messages in thread
From: vklein @ 2015-05-07 11:44 UTC (permalink / raw)
To: Oliver Hartkopp, linux-can
Am 07.05.2015 um 09:59 schrieb Kurt Van Dijck:
> Hey,
>
> --- Original message ---
>> On 05/04/2015 09:10 PM, vklein wrote:
>>
>>> I want to test the status of can0 on a BeagleBoneBlack with serial-can cape
>>> from Logic Supply.
>>>
>>> The interface is initialized with
>>> ip link set can0 type can bitrate 250000
>>> ifconfig can0 up
>> Good.
>>
>>> I have tried
>>> cat /sys/class/net/can0/operstate
>>> but this does not work correctly
>>>
>>> if can0 is down, I get "down"
>>>
>>> if can0 is up , I get "unknown"
>> The question is whether operstate is always set correctly ...
>>
>>> ifconfig says:
>>> can0 Link encap:UNSPEC HWaddr
>>> 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
>>> UP RUNNING NOARP MTU:16 Metric:1
>>> RX packets:0 errors:0 dropped:0 overruns:0 frame:0
>>> TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
>>> collisions:0 txqueuelen:10
>>> RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
>>> Interrupt:55
>>>
>> What does
>>
>> ip -det link show can0
>>
>> tell you?
>>
>> Using the 'ip' tool is recommended to get the device state.
> I agree that 'ip' is the recommended way.
> ip is an interactive tool.
> To access it from c code, I wrote myself a library with example code:
>
> https://github.com/kurt-vd/enumif
>
> regards,
> Kurt
ip -det link show can0 | grep UP
works for me
Victor
^ permalink raw reply [flat|nested] 4+ messages in thread
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2015-05-06 15:28 ` Oliver Hartkopp
2015-05-07 7:59 ` Kurt Van Dijck
2015-05-07 11:44 ` vklein
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