can-utils
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linux-can
Cannot dump any data
I own a waveshare CAN HAT on a raspberry zero. I need to read data broadcasted by a BMS (CAN doc here). The manufacturer told me "All data gets sent out by default so you don’t need to request anything, just receive and interpret."
I connected the "H" and the "L" of the HAT respectively to the "H" and the "L" of the BMS. I have the manufacturer's external monitor connected to the same CAN ports on the BMS and working properly, thus, showing CAN BUS data without issue.
I installed can-utils v 2020.11.0-1 arm64 from repository.
Configured the Pi as per the documentation :
dtparam=spi=on
dtoverlay=mcp2515-can0,oscillator=12000000,interrupt=25,spimaxfrequency=2000000
# uname -a
Linux rasp0 5.15.32-v8+ #1538 SMP PREEMPT Thu Mar 31 19:40:39 BST 2022 aarch64 GNU/Linux
# lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description: Debian GNU/Linux 11 (bullseye)
Release: 11
Codename: bullseye
# dmesg
[ 9.703968] CAN device driver interface
[ 9.793985] mcp251x spi0.0 can0: MCP2515 successfully initialized.
[ 1027.644470] can: controller area network core
[ 1027.644606] NET: Registered PF_CAN protocol family
[ 1027.658904] can: raw protocol
[ 1070.343869] IPv6: ADDRCONF(NETDEV_CHANGE): can0: link becomes ready
# ip link set can0 up type can bitrate 250000
# ip -det 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 minmtu 0 maxmtu 0
can <LOOPBACK> state ERROR-ACTIVE restart-ms 0
bitrate 250000 sample-point 0.833
tq 333 prop-seg 4 phase-seg1 5 phase-seg2 2 sjw 1
mcp251x: tseg1 3..16 tseg2 2..8 sjw 1..4 brp 1..64 brp-inc 1
clock 6000000 numtxqueues 1 numrxqueues 1 gso_max_size 65536 gso_max_segs 65535
I then try to dump, but I get no output at all:
# candump any -x
If I do cangen can0 while candump is running, I can see some output.
What am I doing wrong ? The raspberry and the CAN HAT are brand new.
- Do you have a proper CAN termination 2x 120 Ohms => 60 Ohms between CAN_L and CAN_H?
- Can you check whether you have a 12M crystal or a 8M crystal on the CAN HAT ?
It looks like the 120 Ohms is here looking at the HAT schematics:
I think I have the 12M crystal, as the last board revision is from 2020. Not sure how I can verify that. But in the doubt, I already tried both overrides.
I also tried a legacy buster image, same issue, with both overrides...
Hm, I'm not really an expert on this. Maybe @marckleinebudde can help here?
The termination resistor on the schematic is 120 Ohms. CAN usually needs 2x120 Ohms in parallel => 60 Ohms in total. You should add another 120 Ohms resistor. And do some measurement with a multimeter if you really got the 60 Ohms in your setup.
The frequency of the crystal should be printed on the silver housing on the PCB.
You wrote: "If I do cangen can0 while candump is running, I can see some output."
Can you check whether your assigned interrupt 25 is increasing? (-> see cat /proc/interrupts)
And also post the output of ip -det link show can0 AFTER this attempt to write some (~20) CAN frames?
I clicked a waveahre board with a 12 MHz oscillator, attached it to my rpi-4, using the raspi kernel v5.18 with the new "mcp2515" overlay and this entry in the config.txt:
dtoverlay=mcp2515,spi0-0,interrupt=25,oscillator=12000000,spimaxfrequency=2000000
or, if you are on an older kernel, use the following entry:
dtoverlay=mcp2515-can0,interrupt=25,oscillator=12000000,spimaxfrequency=2000000
It works out of the box.
I am on kernel v5.15, tried both config which behave the same.
With loopback enabled, I can send and read what I send.
With listen-only off I get some data, but it doesn't seem to be what is expected: RX errors is increasing and keeps the same value as frame count.
Candump output:
can0 311 [8] A5 57 24 92 49 25 E9 67
can0 311 [6] 25 97 24 92 49 25
can0 312 [8] remote request
can0 301 [0]
can0 314 [8] remote request
can0 301 [0]
can0 314 [8] remote request
can0 1B0 [8] remote request
can0 301 [0]
can0 304 [8] remote request
can0 1B0 [8] remote request
can0 0CD0158B [0] remote request
can0 304 [8] remote request
can0 300 [8] remote request
can0 0CD0158B [0] remote request
can0 311 [8] AA AF 24 92 49 25 E9 67
can0 0C45128B [8] remote request
can0 301 [8] AA AF 24 92 49 25 E9 67
can0 0C45128B [8] remote request
can0 0CD0158B [0] remote request
can0 301 [8] AA AF 24 92 49 25 E9 67
can0 314 [8] remote request
can0 311 [8] AA AF 24 92 49 25 E9 67
can0 314 [8] remote request
can0 0C86128B [8] remote request
can0 311 [8] AA AF 24 92 49 25 E9 67
can0 1B0 [8] remote request
can0 0C86128B [8] remote request
can0 311 [8] AA AF 24 92 49 25 E9 67
can0 1B0 [8] remote request
can0 0C86128B [8] remote request
can0 0CD09195 [8] AA AF 24 92 49 25 E9 67
can0 0C86128B [8] remote request
can0 312 [6] 25 97 24 92 49 25
can0 311 [8] A4 AF 24 92 49 25 E9 67
can0 0C45128B [6] 25 1F 24 92 49 25
can0 0C4B9195 [8] A4 AF 24 92 49 25 E9 67
can0 0C05128B [6] 25 1F 24 92 49 25
can0 314 [8] remote request
can0 0C05128B [6] 25 1F 24 92 49 25
can0 1B0 [8] remote request
can0 0C05128B [6] 25 1F 24 92 49 25
can0 0C06128B [8] remote request
can0 1B0 [8] remote request
can0 0CD0128B [6] 25 1F 24 92 49 25
can0 0C06128B [8] remote request
can0 300 [8] remote request
can0 0CD0128B [6] 25 1F 24 92 49 25
can0 311 [8] 89 5F 24 92 49 25 82 F3
can0 0C45128B [8] remote request
can0 301 [8] 89 5F 24 92 49 25 82 F3
can0 0C45128B [8] remote request
can0 0CD0128B [6] 25 1F 24 92 49 25
can0 301 [8] 89 5F 24 92 49 25 82 F3
can0 314 [8] remote request
can0 311 [8] 89 5F 24 92 49 25 82 F3
can0 314 [8] remote request
can0 0C87128B [8] remote request
can0 1B0 [8] remote request
can0 0C87128B [8] remote request
can0 314 [8] remote request
can0 1B0 [8] remote request
can0 0C87128B [8] remote request
can0 304 [8] remote request
can0 0C87128B [8] remote request
can0 312 [6] 89 5F 24 92 49 25
can0 311 [8] AA 9F 24 92 49 25 FD FB
can0 0C45128B [6] 89 5F 24 92 49 25
can0 0C4B918B [8] AA 9F 24 92 49 25 FD FB
can0 0C05128B [6] 89 5F 24 92 49 25
can0 314 [8] remote request
can0 0C85128B [6] 89 5F 24 92 49 25
can0 1B0 [8] remote request
can0 0C85128B [6] 89 5F 24 92 49 25
can0 0C07128B [8] remote request
can0 1B0 [8] remote request
can0 0CD0128B [6] 89 5F 24 92 49 25
can0 0C07128B [8] remote request
can0 300 [8] remote request
can0 0CD0128B [6] 89 5F 24 92 49 25
can0 311 [8] 42 EF 24 92 49 25 E9 67
can0 0C45118B [8] remote request
can0 301 [8] 42 EF 24 92 49 25 E9 67
can0 0C45118B [8] remote request
can0 0CD0128B [6] 89 5F 24 92 49 25
can0 301 [8] 42 EF 24 92 49 25 E9 67
can0 314 [8] remote request
can0 311 [8] 42 EF 24 92 49 25 E9 67
can0 314 [8] remote request
can0 0C84118B [8] remote request
can0 1B0 [8] remote request
can0 0C84118B [8] remote request
can0 314 [8] remote request
can0 1B0 [8] remote request
can0 0C84118B [8] remote request
can0 304 [8] remote request
can0 0C84118B [8] remote request
can0 312 [6] 42 EF 24 92 49 25
can0 304 [8] remote request
can0 0C45128B [6] 42 EF 24 92 49 25
can0 0C4B918B [8] remote request
can0 0C05128B [6] 42 EF 24 92 49 25
can0 0C4B918B [8] remote request
can0 0C05128B [6] 42 EF 24 92 49 25
can0 0C87118B [8] remote request
can0 1B0 [8] remote request
can0 0C87118B [8] remote request
can0 0C05128B [6] 42 EF 24 92 49 25
can0 1B0 [8] remote request
can0 0CD0118B [8] remote request
can0 0C05128B [6] 42 EF 24 92 49 25
can0 300 [8] remote request
can0 0CD0118B [8] remote request
can0 311 [8] D5 5F 24 92 49 25 E9 67
can0 0C451449 [8] remote request
can0 301 [8] D5 5F 24 92 49 25 E9 67
can0 0C451449 [8] remote request
can0 0CD0118B [8] remote request
can0 301 [8] D5 5F 24 92 49 25 E9 67
can0 314 [8] remote request
can0 311 [8] D5 5F 24 92 49 25 E9 67
can0 314 [8] remote request
can0 0C859249 [8] remote request
can0 1B0 [8] remote request
can0 0C859249 [8] remote request
can0 314 [8] remote request
can0 0C859249 [8] remote request
can0 1B0 [8] remote request
can0 0CD0118B [8] remote request
can0 0C859249 [8] remote request
can0 312 [6] D5 5F 24 92 49 25
can0 0C10118B [8] remote request
can0 312 [6] D5 5F 24 92 49 25
can0 0C451461 [8] remote request
can0 0C4B918B [8] remote request
can0 0C051461 [8] remote request
can0 314 [8] remote request
can0 0C841461 [8] remote request
can0 314 [8] remote request
can0 1B0 [8] remote request
can0 0C841461 [8] remote request
can0 304 [8] remote request
can0 1B0 [8] remote request
can0 0C041461 [8] remote request
can0 304 [8] remote request
can0 300 [8] remote request
can0 0C041461 [8] remote request
can0 311 [8] D5 5F 24 92 49 25 FD FB
can0 0C45118B [8] remote request
can0 301 [8] D5 5F 24 92 49 25 FD FB
can0 0C45118B [8] remote request
can0 0C041461 [8] remote request
can0 301 [8] D5 5F 24 92 49 25 FD FB
can0 314 [8] remote request
can0 311 [8] D5 5F 24 92 49 25 FD FB
can0 314 [8] remote request
can0 0C86924D [8] remote request
can0 1B0 [8] remote request
can0 0C86924D [8] remote request
can0 314 [8] remote request
can0 1B0 [8] remote request
can0 0C86924D [8] remote request
can0 0CD01461 [8] remote request
can0 0C86924D [8] remote request
can0 312 [6] D5 5F 24 92 49 25
can0 311 [8] 88 DF 24 92 49 25 82 F3
can0 0C45128B [6] D5 5F 24 92 49 25
can0 0C4B9161 [8] 88 DF 24 92 49 25 82 F3
can0 0C05128B [6] D5 5F 24 92 49 25
can0 314 [8] remote request
can0 0C86128B [6] D5 5F 24 92 49 25
can0 314 [8] remote request
can0 1B0 [8] remote request
can0 0C86128B [6] D5 5F 24 92 49 25
can0 304 [8] remote request
can0 1B0 [8] remote request
can0 0CD0128B [6] D5 5F 24 92 49 25
can0 304 [8] remote request
can0 300 [8] remote request
can0 0CD0128B [6] D5 5F 24 92 49 25
can0 304 [8] remote request
can0 0C4512BB [8] remote request
can0 304 [8] remote request
can0 0C4512BB [8] remote request
can0 0CD0128B [6] D5 5F 24 92 49 25
can0 304 [8] remote request
can0 314 [8] remote request
can0 314 [8] remote request
can0 314 [8] remote request
can0 0C0512BB [8] remote request
can0 1B0 [8] remote request
can0 0C0512BB [8] remote request
can0 314 [8] remote request
can0 1B0 [8] remote request
can0 0C0512BB [8] remote request
can0 0CD0128B [8] remote request
can0 0C0512BB [8] remote request
can0 312 [6] 88 DF 24 92 49 25
can0 311 [8] AA 9F 24 92 49 25 FD FB
can0 0C45128B [6] 88 DF 24 92 49 25
can0 0C4B918B [8] AA 9F 24 92 49 25 FD FB
can0 0C05128B [6] 88 DF 24 92 49 25
can0 314 [8] remote request
can0 0C852496 [6] 88 DF 24 92 49 25
can0 1B0 [8] remote request
can0 0C852496 [6] 88 DF 24 92 49 25
can0 0C0512BB [8] remote request
can0 1B0 [8] remote request
can0 0CD02496 [6] 88 DF 24 92 49 25
can0 0C0512BB [8] remote request
can0 338 [8] remote request
can0 0CD02496 [6] 88 DF 24 92 49 25
can0 311 [8] 62 17 24 92 49 25 E9 67
can0 311 [8] AA 8F 24 92 49 25 FD FB
can0 301 [8] 62 17 24 92 49 25 E9 67
can0 311 [8] AA 8F 24 92 49 25 FD FB
can0 0CD02496 [6] 88 DF 24 92 49 25
can0 301 [8] 62 17 24 92 49 25 E9 67
can0 314 [8] remote request
can0 311 [8] 62 17 24 92 49 25 E9 67
can0 314 [8] remote request
can0 0C87924F [8] AA 8F 24 92 49 25 FD FB
can0 1B0 [8] remote request
can0 0C87924F [8] AA 8F 24 92 49 25 FD FB
can0 314 [8] remote request
can0 0C87924F [8] AA 8F 24 92 49 25 FD FB
can0 1B0 [8] remote request
can0 0CD02496 [8] remote request
can0 0C87924F [8] AA 8F 24 92 49 25 FD FB
can0 312 [7] 62 17 24 92 49 25 E9
can0 311 [8] 89 8F 24 92 49 25 82 F3
can0 311 [8] D5 17 24 92 49 25 E9 67
can0 312 [8] remote request
can0 301 [0]
can0 314 [8] remote request
can0 301 [0]
can0 314 [8] remote request
can0 0C87924F [8] AA 8F 24 92 49 25 FD FB
can0 1B0 [8] remote request
can0 314 [8] remote request
can0 0C07924F [8] AA 8F 24 92 49 25 FD FB
can0 1B0 [8] remote request
can0 0CD02496 [8] remote request
can0 1B0 [8] remote request
can0 0C07924F [8] AA 8F 24 92 49 25 FD FB
can0 0CD02496 [8] remote request
can0 311 [8] A9 CF 24 92 49 25 E9 67
can0 311 [8] AA 2F 24 92 49 25 FD FB
can0 301 [8] A9 CF 24 92 49 25 E9 67
can0 311 [8] AA 2F 24 92 49 25 FD FB
can0 0C102496 [8] remote request
can0 314 [8] remote request
can0 0C502496 [8] remote request
can0 314 [8] remote request
can0 0C84924F [8] AA 2F 24 92 49 25 FD FB
can0 1B0 [8] remote request
can0 0C84924F [8] AA 2F 24 92 49 25 FD FB
can0 314 [8] remote request
can0 1B0 [8] remote request
can0 0C84924F [8] AA 2F 24 92 49 25 FD FB
can0 304 [8] remote request
can0 0C84924F [8] AA 2F 24 92 49 25 FD FB
can0 312 [6] 89 BF 24 92 49 25
can0 311 [8] 87 9F 24 92 49 25 E9 67
can0 311 [8] 8B BF 24 92 49 25 82 F3
can0 0C4B91BB [8] 87 9F 24 92 49 25 E9 67
can0 301 [8] 8B BF 24 92 49 25 82 F3
can0 314 [8] remote request
can0 0C852496 [8] 8B BF 24 92 49 25 82 F3
can0 1B0 [8] remote request
can0 0C852496 [8] 8B BF 24 92 49 25 82 F3
can0 0C04924F [8] AA 2F 24 92 49 25 FD FB
can0 1B0 [8] remote request
can0 0CD02496 [8] 8B BF 24 92 49 25 82 F3
can0 0C04924F [8] AA 2F 24 92 49 25 FD FB
can0 300 [8] remote request
can0 0CD02496 [8] 8B BF 24 92 49 25 82 F3
can0 311 [8] 89 DF 24 92 49 25 FD FB
can0 311 [8] 42 2F 24 92 49 25 E9 67
can0 301 [8] 89 DF 24 92 49 25 FD FB
can0 311 [8] 42 2F 24 92 49 25 E9 67
can0 0CD02496 [8] 8B BF 24 92 49 25 82 F3
can0 301 [8] 89 DF 24 92 49 25 FD FB
can0 314 [8] remote request
can0 311 [8] 89 DF 24 92 49 25 FD FB
can0 314 [8] remote request
can0 321 [8] remote request
can0 1B0 [8] remote request
can0 321 [8] remote request
can0 314 [8] remote request
can0 1B0 [8] remote request
can0 321 [8] remote request
can0 0CD02496 [8] remote request
can0 321 [8] remote request
can0 312 [6] 89 DF 24 92 49 25
can0 0C102496 [8] remote request
can0 311 [8] C2 DF 24 92 49 25 FD FB
can0 0C4B9196 [8] remote request
can0 301 [8] C2 DF 24 92 49 25 FD FB
can0 314 [8] remote request
can0 321 [0] remote request
can0 314 [8] remote request
can0 1B0 [8] remote request
can0 321 [0] remote request
can0 304 [8] remote request
can0 1B0 [8] remote request
can0 301 [0] remote request
can0 304 [8] remote request
can0 1B0 [8] remote request
can0 301 [0] remote request
can0 304 [8] remote request
can0 300 [8] remote request
can0 304 [8] remote request
can0 311 [8] 8C 4F 24 92 49 25 FD FB
can0 300 [8] remote request
can0 311 [8] 8C 4F 24 92 49 25 FD FB
can0 304 [8] remote request
can0 300 [8] remote request
can0 314 [8] remote request
can0 310 [8] remote request
can0 314 [8] remote request
can0 321 [4] remote request
can0 1B0 [8] remote request
can0 321 [4] remote request
can0 314 [8] remote request
can0 1B0 [8] remote request
can0 321 [4] remote request
can0 0CD09196 [8] remote request
can0 321 [4] remote request
can0 312 [6] 42 2F 24 92 49 25
can0 311 [8] 99 2F 24 92 49 25 82 F3
can0 302 [6] 42 2F 24 92 49 25
can0 311 [8] 99 2F 24 92 49 25 82 F3
can0 0C4B914F [4] remote request
can0 302 [6] 42 2F 24 92 49 25
can0 314 [8] remote request
can0 321 [6] remote request
can0 314 [0] remote request
can0 1B0 [8] remote request
can0 321 [6] remote request
can0 304 [0] remote request
can0 1B0 [8] remote request
can0 0CD091BB [6] 42 2F 24 92 49 25
can0 304 [0] remote request
can0 300 [8] remote request
can0 0CD091BB [6] 42 2F 24 92 49 25
can0 304 [0] remote request
can0 311 [8] 99 1F 24 92 49 25 82 F3
can0 311 [8] 42 5F 24 92 49 25 FD FB
can0 301 [8] 99 1F 24 92 49 25 82 F3
can0 311 [8] 42 5F 24 92 49 25 FD FB
can0 0CD091BB [6] 42 2F 24 92 49 25
can0 301 [8] 99 1F 24 92 49 25 82 F3
can0 314 [8] remote request
can0 311 [8] 99 1F 24 92 49 25 82 F3
can0 314 [8] remote request
can0 0C85914F [8] 42 5F 24 92 49 25 FD FB
can0 311 [8] 99 1F 24 92 49 25 82 F3
can0 1B0 [8] remote request
can0 0C85914F [8] 42 5F 24 92 49 25 FD FB
can0 311 [8] 99 1F 24 92 49 25 82 F3
can0 1B0 [8] remote request
can0 0C85914F [8] 42 5F 24 92 49 25 FD FB
can0 0CD09196 [8] 99 1F 24 92 49 25 82 F3
can0 0C85914F [8] 42 5F 24 92 49 25 FD FB
can0 312 [7] 42 2F 24 92 49 25 E9
can0 311 [8] 99 1F 24 92 49 25 82 F3
can0 311 [8] 8C 2F 24 92 49 25 E9 67
can0 312 [8] remote request
can0 301 [0]
can0 314 [8] remote request
can0 301 [0]
can0 1B0 [8] remote request
can0 301 [0]
can0 0C05914F [8] 42 5F 24 92 49 25 FD FB
can0 1B0 [8] remote request
can0 0CD091BB [0] remote request
can0 0C05914F [8] 42 5F 24 92 49 25 FD FB
can0 300 [8] remote request
can0 0CD091BB [0] remote request
can0 311 [8] 99 1F 24 92 49 25 FD FB
can0 311 [8] D4 9F 24 92 49 25 82 F3
can0 301 [8] 99 1F 24 92 49 25 FD FB
can0 311 [8] D4 9F 24 92 49 25 82 F3
can0 0CD091BB [0] remote request
can0 301 [8] 99 1F 24 92 49 25 FD FB
can0 314 [8] remote request
can0 311 [8] 99 1F 24 92 49 25 FD FB
can0 314 [8] remote request
can0 0C86924C [8] D4 9F 24 92 49 25 82 F3
can0 1B0 [8] remote request
can0 0C86924C [8] D4 9F 24 92 49 25 82 F3
can0 314 [8] remote request
can0 0C86924C [8] D4 9F 24 92 49 25 82 F3
can0 1B0 [8] remote request
can0 304 [8] remote request
can0 0C86924C [8] D4 9F 24 92 49 25 82 F3
can0 312 [6] 99 1F 24 92 49 25
can0 311 [8] 99 1F 24 92 49 25 E9 67
can0 311 [8] 8C 5F 24 92 49 25 FD FB
can0 0C4B91BB [8] 99 1F 24 92 49 25 E9 67
can0 301 [8] 8C 5F 24 92 49 25 FD FB
can0 314 [8] remote request
can0 0C84914F [8] 8C 5F 24 92 49 25 FD FB
can0 314 [8] remote request
can0 1B0 [8] remote request
can0 0C04914F [8] 8C 5F 24 92 49 25 FD FB
can0 1B0 [8] remote request
can0 304 [8] remote request
can0 0C04914F [8] 8C 5F 24 92 49 25 FD FB
can0 1B0 [8] remote request
can0 304 [8] remote request
can0 0C04914F [8] 8C 5F 24 92 49 25 FD FB
can0 311 [8] A9 DF 24 92 49 25 82 F3
can0 311 [8] 8C 5F 24 92 49 25 FD FB
can0 301 [8] A9 3F 24 92 49 25 82 F3
can0 311 [8] 8C 5F 24 92 49 25 FD FB
can0 304 [8] remote request
can0 301 [8] A9 3F 24 92 49 25 82 F3
can0 314 [8] remote request
can0 311 [8] A9 3F 24 92 49 25 82 F3
can0 314 [8] remote request
can0 0C87914F [8] 8C 5F 24 92 49 25 FD FB
can0 311 [8] A9 3F 24 92 49 25 82 F3
can0 1B0 [8] remote request
can0 0C87914F [8] 8C 5F 24 92 49 25 FD FB
can0 311 [8] A9 3F 24 92 49 25 82 F3
can0 1B0 [8] remote request
can0 0CD0914F [8] 8C 5F 24 92 49 25 FD FB
can0 311 [8] A9 3F 24 92 49 25 82 F3
can0 312 [6] 99 1F 24 92 49 25
can0 311 [8] 89 5F 24 92 49 25 FD FB
can0 311 [8] C2 4F 24 92 49 25 E9 67
can0 0C4B914F [8] 89 5F 24 92 49 25 FD FB
can0 301 [8] C2 4F 24 92 49 25 E9 67
can0 314 [8] remote request
can0 0C842497 [8] C2 4F 24 92 49 25 E9 67
can0 1B0 [8] remote request
can0 0C842497 [8] C2 4F 24 92 49 25 E9 67
can0 301 [8] A9 3F 24 92 49 25 82 F3
can0 1B0 [8] remote request
can0 0CD02497 [8] C2 4F 24 92 49 25 E9 67
can0 301 [8] A9 3F 24 92 49 25 82 F3
can0 300 [8] remote request
can0 0CD02497 [8] C2 4F 24 92 49 25 E9 67
can0 301 [8] A9 3F 24 92 49 25 82 F3
can0 300 [8] remote request
can0 311 [8] 8C 4F 24 92 49 25 E9 67
can0 301 [8] A9 3F 24 92 49 25 82 F3
can0 311 [8] 8C 4F 24 92 49 25 E9 67
can0 300 [8] remote request
can0 314 [8] remote request
can0 310 [8] remote request
can0 314 [8] remote request
can0 0C852497 [8] 8C 4F 24 92 49 25 E9 67
can0 310 [8] remote request
can0 1B0 [8] remote request
can0 0C852497 [8] 8C 4F 24 92 49 25 E9 67
can0 310 [8] remote request
can0 1B0 [8] remote request
can0 0C852497 [8] 8C 4F 24 92 49 25 E9 67
can0 0CD0914F [8] remote request
can0 0C852497 [8] 8C 4F 24 92 49 25 E9 67
can0 312 [6] A9 3F 24 92 49 25
can0 311 [8] 99 1F 24 92 49 25 FD FB
can0 311 [8] 8C 4F 24 92 49 25 82 F3
can0 0C4B914F [8] 99 1F 24 92 49 25 FD FB
can0 301 [8] 8C 4F 24 92 49 25 82 F3
can0 314 [8] remote request
can0 301 [8] 8C 4F 24 92 49 25 82 F3
can0 314 [8] remote request
can0 1B0 [8] remote request
can0 301 [8] 8C 4F 24 92 49 25 82 F3
can0 304 [8] remote request
can0 1B0 [8] remote request
can0 0CD0924C [8] 8C 4F 24 92 49 25 82 F3
can0 304 [8] remote request
can0 300 [8] remote request
can0 0CD0924C [8] 8C 4F 24 92 49 25 82 F3
can0 311 [8] 99 1F 24 92 49 25 FD FB
can0 311 [8] 8C 4F 24 92 49 25 E9 67
can0 301 [8] 99 3F 24 92 49 25 FD FB
can0 311 [8] 8C 4F 24 92 49 25 E9 67
can0 0CD0924C [8] 8C 4F 24 92 49 25 82 F3
can0 301 [8] 99 3F 24 92 49 25 FD FB
can0 314 [8] remote request
can0 311 [8] 99 3F 24 92 49 25 FD FB
can0 314 [8] remote request
can0 0C872497 [8] 8C 4F 24 92 49 25 E9 67
can0 311 [8] 99 3F 24 92 49 25 FD FB
can0 1B0 [8] remote request
can0 0C872497 [8] 8C 4F 24 92 49 25 E9 67
can0 311 [8] 99 3F 24 92 49 25 FD FB
can0 1B0 [8] remote request
can0 0C872497 [8] 8C 4F 24 92 49 25 E9 67
can0 301 [8] 99 3F 24 92 49 25 FD FB
can0 0C872497 [8] 8C 4F 24 92 49 25 E9 67
can0 1B0 [8] remote request
can0 312 [6] 99 3F 24 92 49 25
can0 311 [8] 89 9F 24 92 49 25 E9 67
can0 311 [8] 8C 4F 24 92 49 25 82 F3
can0 0C4B9197 [8] 89 3F 24 92 49 25 E9 67
Without listen-only, there is no output.
Maybe your bit timing doesn't match 100% the bit timing of the sender. The mcp251x driver limits the tseg1_min1 to 3 resulting in a sample point a few % to early.
Bit timing parameters for mcp251x with 6.000000 MHz ref clock (12 MHz OSC) using algo 'v4.8'
nominal real Bitrt nom real SampP
Bitrate TQ[ns] PrS PhS1 PhS2 SJW BRP Bitrate Error SampP SampP Error CNF1 CNF2 CNF3
1000000 166 1 2 2 1 1 1000000 0.0% 75.0% 66.6% 11.2% 0x00 0x88 0x01
800000 ***bitrate not possible***
666666 166 3 3 2 1 1 666666 0.0% 80.0% 77.7% 2.9% 0x00 0x92 0x01
500000 166 4 5 2 1 1 500000 0.0% 87.5% 83.3% 4.8% 0x00 0xa3 0x01
250000 333 4 5 2 1 2 250000 0.0% 87.5% 83.3% 4.8% 0x01 0xa3 0x01
^^^^
~5% error in sample point
125000 500 6 7 2 1 3 125000 0.0% 87.5% 87.5% 0.0% 0x02 0xb5 0x01
100000 666 6 6 2 1 4 100000 0.0% 87.5% 86.6% 1.0% 0x03 0xad 0x01
83333 1000 4 5 2 1 6 83333 0.0% 87.5% 83.3% 4.8% 0x05 0xa3 0x01
50000 1333 6 6 2 1 8 50000 0.0% 87.5% 86.6% 1.0% 0x07 0xad 0x01
33333 2000 6 6 2 1 12 33333 0.0% 87.5% 86.6% 1.0% 0x0b 0xad 0x01
20000 3333 6 6 2 1 20 20000 0.0% 87.5% 86.6% 1.0% 0x13 0xad 0x01
10000 6666 6 6 2 1 40 10000 0.0% 87.5% 86.6% 1.0% 0x27 0xad 0x01
I don't see this limitation in the data sheet, can you try the followin patch and see if it helps?
index fc747bff5eeb..7dbb1add55cb 100644
--- a/drivers/net/can/spi/mcp251x.c
+++ b/drivers/net/can/spi/mcp251x.c
@@ -209,7 +209,7 @@
static const struct can_bittiming_const mcp251x_bittiming_const = {
.name = DEVICE_NAME,
- .tseg1_min = 3,
+ .tseg1_min = 2,
.tseg1_max = 16,
.tseg2_min = 2,
.tseg2_max = 8,
Please check RX and post the output of
ip -det link show can0
How should I apply the patch please, I am confused, I don't find the drivers/net/can/spi/mcp251x.c file.
The patch is against the driver for the mcp251x chip, which is part of the Linux kernel, e.g. https://github.com/torvalds/linux/blob/master/drivers/net/can/spi/mcp251x.c
I finally recompiled it as instructed :
root@zero:~# ip -det link show can0
4: can0: <NOARP,ECHO> mtu 16 qdisc noop state DOWN mode DEFAULT group default qlen 10
link/can promiscuity 0 minmtu 0 maxmtu 0
can state STOPPED restart-ms 0
mcp251x: tseg1 2..16 tseg2 2..8 sjw 1..4 brp 1..64 brp-inc 1
clock 6000000 numtxqueues 1 numrxqueues 1 gso_max_size 65536 gso_max_segs 65535
root@zero:~# ip link set can0 up type can bitrate 250000
root@zero:~# ip -det 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 minmtu 0 maxmtu 0
can state ERROR-PASSIVE restart-ms 0
bitrate 250000 sample-point 0.833
tq 333 prop-seg 4 phase-seg1 5 phase-seg2 2 sjw 1
mcp251x: tseg1 2..16 tseg2 2..8 sjw 1..4 brp 1..64 brp-inc 1
clock 6000000 numtxqueues 1 numrxqueues 1 gso_max_size 65536 gso_max_segs 65535
Ok, makes no difference with respect to the bit timing. Does it work now?
candump any -x still outputs nothing.
If I run cangen can0, Bus goes off ...
4: can0: <NO-CARRIER,NOARP,UP,ECHO> mtu 16 qdisc pfifo_fast state DOWN mode DEFAULT group default qlen 10
link/can promiscuity 0 minmtu 0 maxmtu 0
can state BUS-OFF restart-ms 0
bitrate 250000 sample-point 0.833
tq 333 prop-seg 4 phase-seg1 5 phase-seg2 2 sjw 1
mcp251x: tseg1 2..16 tseg2 2..8 sjw 1..4 brp 1..64 brp-inc 1
clock 6000000 numtxqueues 1 numrxqueues 1 gso_max_size 65536 gso_max_segs 65535
And then:
# ip link set can0 up type can bitrate 250000
RTNETLINK answers: Device or resource busy
Have you checked the oscillator on your board? What does it say? Do you have a 2nd CAN controller you can test against?