Re: Error Active

[Steffen Rose <ro@emtas.de>]

Hello Wolfgang,

thank you very much for your answers.
 
> libsocketcan, like ip uses a netlink socket to get the configuration and
> statistics of the CAN device. This includes the "state" property.

Do all implementation support the netlink socket, especially the CAN state?
I think, state is UNKNOWN and don't mean the Can state, is it?

$ ip -det -stat link show can0
3: can0: <NOARP,UP,LOWER_UP,ECHO> mtu 16 qdisc pfifo_fast *state* UNKNOWN qlen 
10000
    link/can 
    *can state* ERROR-ACTIVE restart-ms 0 
    bitrate 250000 sample-point 0.875 
    tq 250 prop-seg 6 phase-seg1 7 phase-seg2 2 sjw 1
    ems_usb: tseg1 1..16 tseg2 1..8 sjw 1..4 brp 1..64 brp-inc 1
    clock 8000000
    re-started bus-errors arbit-lost error-warn error-pass bus-off
    0          0          0          0          0          0         
    RX: bytes  packets  errors  dropped overrun mcast   
    0          0        0       0       0       0      
    TX: bytes  packets  errors  dropped carrier collsns 
    0          0        0       0       0       0      

 
> > Do socketcan have different ways to get the current state? Is it a low
> > level
> > driver part to read and hold the current state?
> 
> No. Both get the infos via netlink socket from the kernel.

I'm not so familiar with the parts of the system and the correct naming of it.

I understand, that socketcan has a common part for all (many) driver 
adaptations  (can_bcm, can_raw) and a CAN controller specific part (can).
As I understand, for the last point exists many different implementations with 
different feature implementation.
 
> > (I'm sorry. I'm unsure about the driver I tested in this situation. I
> > think,
> > it was the EMS CPC driver and kernel 3.2.0-60-generic. )
> 
> This device uses a SJA1000.
> 

My mistake
USB interface from EMS

vcan                   12686  0 
can_bcm                22077  0 
can_raw                17120  0 
can                    36556  2 can_bcm,can_raw
ems_usb                17510  0 
can_dev                15321  1 ems_usb


-- 

Mit freundlichen Grüßen

    Steffen Rose

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