On 22.12.2022 10:30:22, Stefan Althöfer wrote:
> Hi Thomas,
>
> > Do I read the pdf correctly (based on the /var/log stuff) that you have two MCP2518FD connected to a Pi4B and
> > both of them are running in internal/external loopback mode no interaction between them and the SPIs are separate?
>
> Yes. For the loopback test the CANs are separate. Errors also occur when sending messages between
> the controllers, but I think that is more difficult to analyze.
>
> root@raspberrypi:~# ip -d -s a s can0
> 4: can0: <NOARP,UP,LOWER_UP,ECHO> mtu 72 qdisc pfifo_fast state UP group default qlen 1000
> link/can promiscuity 0 minmtu 0 maxmtu 0
> can <LOOPBACK,BERR-REPORTING,FD> state ERROR-ACTIVE (berr-counter tx 0 rx 0) restart-ms 0
> bitrate 1000000 sample-point 0.800
> tq 25 prop-seg 15 phase-seg1 16 phase-seg2 8 sjw 6
> mcp251xfd: tseg1 2..256 tseg2 1..128 sjw 1..128 brp 1..256 brp-inc 1
> dbitrate 4000000 dsample-point 0.800
> dtq 25 dprop-seg 3 dphase-seg1 4 dphase-seg2 2 dsjw 2
> mcp251xfd: dtseg1 1..32 dtseg2 1..16 dsjw 1..16 dbrp 1..256 dbrp-inc 1
> clock 40000000
> re-started bus-errors arbit-lost error-warn error-pass bus-off
> 0 0 0 0 0 0 numtxqueues 1 numrxqueues 1 gso_max_size 65536 gso_max_segs 65535
> RX: bytes packets errors dropped missed mcast
> 3097429872 2517466658 0 0 0 0
> TX: bytes packets errors dropped carrier collsns
> 3696197680 1258733264 0 0 0 0
> root@raspberrypi:~# ip -d -s a s can1
> 5: can1: <NOARP,UP,LOWER_UP,ECHO> mtu 72 qdisc pfifo_fast state UP group default qlen 1000
> link/can promiscuity 0 minmtu 0 maxmtu 0
> can <LOOPBACK,BERR-REPORTING,FD> state ERROR-ACTIVE (berr-counter tx 0 rx 0) restart-ms 0
> bitrate 1000000 sample-point 0.800
> tq 25 prop-seg 15 phase-seg1 16 phase-seg2 8 sjw 6
> mcp251xfd: tseg1 2..256 tseg2 1..128 sjw 1..128 brp 1..256 brp-inc 1
> dbitrate 4000000 dsample-point 0.800
> dtq 25 dprop-seg 3 dphase-seg1 4 dphase-seg2 2 dsjw 2
> mcp251xfd: dtseg1 1..32 dtseg2 1..16 dsjw 1..16 dbrp 1..256 dbrp-inc 1
> clock 40000000
> re-started bus-errors arbit-lost error-warn error-pass bus-off
> 0 112256 0 1 3 1 numtxqueues 1 numrxqueues 1 gso_max_size 65536 gso_max_segs 65535
^^^^^^ ^ ^ ^
> RX: bytes packets errors dropped missed mcasta
> 2590649888 773910314 3 0 0 0
> TX: bytes packets errors dropped carrier collsns
> 3442619696 386944310 112254 12 0 0
Why do you have so many errors on can1? The device event went into bus-off.
> This is the SPI setup for the dual CAN PI:
>
> dtparam=spi=on
> dtoverlay=spi6-1cs
> # mcp251xfd DTS for RPI4 default CAN on SPI6.0
> dtoverlay=mcp251xfd-spi6-0,interrupt_pin=25,oscillator=40000000
> # mcp251xfd DTS for RPI4 CAN extension on SPI0.0
> dtoverlay=mcp251xfd,spi0-0,interrupt=16,oscillator=40000000
>
> Or did you mean something else with "script"?
Can you share your "scselftest" program?
> I'll try the register dump when I suffer the next error ;-)
Marc
--
Pengutronix e.K. | Marc Kleine-Budde |
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