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CAN hangs on RaspberryPi
Posted: Tue 16. Apr 2019, 11:05
by 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:
Code: Select all
[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?
Re: CAN hangs on RaspberryPi
Posted: Tue 16. Apr 2019, 16:58
by S.Grosjean
Hi,
Please type:
Check if the bitrate is ok with the other equipments connected to the bus.
Next, regarding:
Code: Select all
can: request_module (can-proto-0) failed.
Looks like some socket-can module (can-raw ?) is not loaded. Please type:
Regards,
Re: CAN hangs on RaspberryPi
Posted: Thu 18. Apr 2019, 10:03
by hardwic
Code: Select all
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
Re: CAN hangs on RaspberryPi
Posted: Thu 18. Apr 2019, 14:07
by 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,
Re: CAN hangs on RaspberryPi
Posted: Thu 18. Apr 2019, 15:45
by 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
Re: CAN hangs on RaspberryPi
Posted: Fri 19. Apr 2019, 09:52
by hardwic
OK that nailed the problem.Thanks