CAN hangs on RaspberryPi

[hardwic]

I am using a USB-CAN which is supplied by Victron but is a PCAN device on Rpi 3 b+ with 4.14.98-v7+

I compiled the kernel drivers that shipped with OS.
The CAN bus hangs every few hours:

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[166262.423367] can: request_module (can-proto-0) failed.
[166361.167539] can: request_module (can-proto-0) failed.
[166756.355582] can: request_module (can-proto-0) failed.
[173719.782304] peak_usb 1-1.1.2:1.0 can0: bus-off

If I bounce the interface, it works again.
I tried 2 different USB adapters and it does the same.

Any ideas what I have wrong?

[S.Grosjean]

Hi,

Please type:

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$ ip -s -d link show can0

Check if the bitrate is ok with the other equipments connected to the bus.

Next, regarding:

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can: request_module (can-proto-0) failed.

Looks like some socket-can module (can-raw ?) is not loaded. Please type:

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$ lsmod | grep can

Regards,

[hardwic]

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ip -s -d link show can0
4: can0: <NOARP,UP,LOWER_UP,ECHO> mtu 16 qdisc pfifo_fast state UP mode DEFAULT group default qlen 10
    link/can  promiscuity 0 
    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
	  pcan_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          3          1          1         numtxqueues 1 numrxqueues 1 gso_max_size 65536 gso_max_segs 65535 
    RX: bytes  packets  errors  dropped overrun mcast   
    84823468   10686522 1       144     1       0       
    TX: bytes  packets  errors  dropped carrier collsns 
    1459391    231552   0       0       0       0   

I see a few error warnings etc, not sure if this is bad.
The interface was running at 500kbs but I dropped it to 250kbs.
The interface runs for days at times but then seem to hang. If you restart it with ifdown/ifup, it works again.

For "lsmod | grep can", I get

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lsmod | grep can
can_bcm                24576  0
can_raw                20480  3
can                    28672  2 can_raw,can_bcm
can_dev                28672  1 peak_usb

[S.Grosjean]

Hi,

Please be sure to use a power supply with enough power for both RPi and PCAN-USB. You can check for the yellow lightening bolt on the screen, which will show up when a undervoltage is detected.

Regards,

[hardwic]

Aha.. I am running off a bench power supply at 5.1v and the supply can deliver 10A if required.
But the wire to the usb connector on the Pi is a bit this and long and the voltdrop maybe an issue.

let me try shortening that and testing again. Thanks

[hardwic]

OK that nailed the problem.Thanks