Am 14.03.2017 um 19:08 schrieb Wolfgang Grandegger:
Hello Akshay,
Am 14.03.2017 um 17:20 schrieb Akshay Bhat:
Hi Wolfgang,
On 03/14/2017 08:11 AM, Wolfgang Grandegger wrote:
... snip ...
A few other things to check:
Run "cangen" and monitor the message with "candump -e
any,0:0,#FFFFFFF".
Then 1) disconnect the cable or 2) short-circuit CAN low and high
at the
connector. You should see error messages. After reconnection or
removing
the short-circuit (and bus-off recovery) the state should go back to
"active".
With the above sequence, candump reports "ERRORFRAME" with
protocol-violation{{}{acknowledge-slot}}, bus-error. On re-connecting
the cable the can state goes back to ACTIVE and I see the messages that
were in the queue being sent.
Do you get the ACK error also with berr-reporting off? Would be nice if
you could show a candump log here.
Below is a log for disconnecting and re-connecting CAN cable scenario:
(Note this is on a 4.1.18 kernel with RT patch)
root@imx6qrom5420b1:~# ip link set can0 up type can bitrate 1000000
berr-reporting on
root@imx6qrom5420b1:~# candump -e any,0:0,#FFFFFFF &
Please add "-td" ...
[1] 768
root@imx6qrom5420b1:~# cangen can0
and "-i" here.
can0 21C [8] 35 98 C0 7A 95 03 E6 2A
can0 6E6 [1] F2
can0 5C7 [2] 42 50
can0 57C [8] 83 7A E4 0C 03 8B 90 45
can0 55C [8] B9 74 87 52 D8 F4 64 04
can0 014 [8] 28 CB 96 57 3B 80 67 4F
can0 6AF [1] 35
can0 51E [8] B6 C8 6C 1D 3A 87 ED 2E
can0 527 [8] D0 8A D3 59 0E 34 40 78
can0 30C [2] 6A 12
can0 145 [8] CB 6E FF 55 C1 BE C3 22
can0 5A5 [8] C4 49 54 68 02 63 F9 35
can0 0BA [8] DA 57 5E 3A CE 88 20 1C
can0 516 [2] 09 09
can0 743 [8] 7C 4D 25 47 61 4C 56 3D
can0 31D [2] 9C D3
can0 71E [8] 53 7C 97 2A 2A F2 9F 56
can0 52E [8] FE DA 2D 51 73 96 DF 79
/////disconnect cable
can0 20000088 [8] 00 00 00 19 00 00 28 00 ERRORFRAME
protocol-violation{{}{acknowledge-slot}}
bus-error
error-counter-tx-rx{{40}{0}}
can0 20000088 [8] 00 00 00 19 00 00 58 00 ERRORFRAME
protocol-violation{{}{acknowledge-slot}}
bus-error
error-counter-tx-rx{{88}{0}}
can0 20000088 [8] 00 00 00 19 00 00 80 00 ERRORFRAME
protocol-violation{{}{acknowledge-slot}}
bus-error
error-counter-tx-rx{{128}{0}}
TX error warning is missing.
can0 2000008C [8] 00 20 00 19 00 00 80 00 ERRORFRAME
controller-problem{tx-error-passive}
protocol-violation{{}{acknowledge-slot}}
bus-error
error-counter-tx-rx{{128}{0}}
Here "tx-error-passiv" is packed with a bus error. What I'm looking for
are state change messages similar to:
can0 20000204 [8] 00 08 00 00 00 00 60 00 ERRORFRAME
controller-problem{tx-error-warning}
state-change{tx-error-warning}
error-counter-tx-rx{{96}{0}}
can0 20000204 [8] 00 30 00 00 00 00 80 00 ERRORFRAME
controller-problem{tx-error-passive}
state-change{tx-error-passive}
error-counter-tx-rx{{128}{0}
They should always come, even with "berr-reporting off".
write: No buffer space available
root@imx6qrom5420b1:~# ip -s -d link show can0
4: can0: <NOARP,UP,LOWER_UP,ECHO> mtu 16 qdisc pfifo_fast state UNKNOWN
mode DEFAULT group default qlen 10
link/can promiscuity 0
can <BERR-REPORTING> state ERROR-PASSIVE (berr-counter tx 128 rx 0)
restart-ms 0
bitrate 1000000 sample-point 0.750
tq 62 prop-seg 5 phase-seg1 6 phase-seg2 4 sjw 1
hi3110: tseg1 2..16 tseg2 2..8 sjw 1..4 brp 1..64 brp-inc 1
clock 16000000
re-started bus-errors arbit-lost error-warn error-pass bus-off
0 6 0 1 1 0
The error warning and passive counter increased , though. Also the bus
error should come in at a rather hight rate. Looking to the code, maybe
you need to test STATF to check for state changes (and not ERR).
Likely the ERR bits are only valid if the BUSERR bit in INTF is set.
RX: bytes packets errors dropped overrun mcast
0 0 6 0 0 0
TX: bytes packets errors dropped carrier collsns
106 18 0 0 0 0
root@imx6qrom5420b1:~#
/////re-connect cable
can0 169 [8] 35 55 A3 1C 0F 47 2E 5B
can0 318 [8] 11 AA 27 11 D2 1B CE 34
can0 577 [8] A0 A4 EE 50 8D A2 E1 3E
can0 4ED [8] 52 96 17 7E 31 FC 7D 7C
can0 2E7 [8] 92 48 D4 39 05 1E 9F 50
can0 200 [8] 4A 66 F6 02 1E 71 8E 26
can0 29A [8] 49 63 2E 7D C9 77 85 7A
can0 15A [7] 3C 0E 65 74 C3 62 80
can0 011 [1] D2
can0 26B [3] FC D6 68
can0 5CE [8] 6F 02 B5 14 BC 7A D7 02
root@imx6qrom5420b1:~# ip -s -d link show can0
4: can0: <NOARP,UP,LOWER_UP,ECHO> mtu 16 qdisc pfifo_fast state UNKNOWN
mode DEFAULT group default qlen 10
link/can promiscuity 0
can <BERR-REPORTING> state ERROR-ACTIVE (berr-counter tx 117 rx 0)
restart-ms 0
bitrate 1000000 sample-point 0.750
tq 62 prop-seg 5 phase-seg1 6 phase-seg2 4 sjw 1
hi3110: tseg1 2..16 tseg2 2..8 sjw 1..4 brp 1..64 brp-inc 1
clock 16000000
re-started bus-errors arbit-lost error-warn error-pass bus-off
0 7 0 1 1 0
RX: bytes packets errors dropped overrun mcast
0 0 7 0 0 0
TX: bytes packets errors dropped carrier collsns
181 29 0 0 0 0
//Reboot the board and test with bus error reporting off
root@imx6qrom5420b1:~# ip link set can0 up type can bitrate 1000000
berr-reporting off
root@imx6qrom5420b1:~# candump -e any,0:0,#FFFFFFF &
[1] 782
root@imx6qrom5420b1:~# cangen can0
can0 1FA [3] C9 FE C2
can0 3E2 [5] 85 37 03 5B 6F
can0 289 [8] A4 F6 BF 4A 3F 70 65 1B
can0 12D [8] B2 72 10 33 AB B4 68 64
can0 054 [2] 01 D7
can0 4A6 [8] 29 7D 76 56 CA C1 60 00
can0 768 [8] 97 3D 92 08 61 C1 D9 03
can0 098 [6] A4 A8 5A 60 92 1A
can0 3C9 [8] 71 78 0D 25 AB 27 8B 51
/////disconnect cable
write: No buffer space available
root@imx6qrom5420b1:~# ip -s -d link show can0
4: can0: <NOARP,UP,LOWER_UP,ECHO> mtu 16 qdisc pfifo_fast state UNKNOWN
mode DEFAULT group default qlen 10
link/can promiscuity 0
can state ERROR-ACTIVE (berr-counter tx 128 rx 0) restart-ms 0
bitrate 1000000 sample-point 0.750
tq 62 prop-seg 5 phase-seg1 6 phase-seg2 4 sjw 1
hi3110: tseg1 2..16 tseg2 2..8 sjw 1..4 brp 1..64 brp-inc 1
clock 16000000
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
56 9 0 0 0 0
root@imx6qrom5420b1:~#
/////re-connect cable
can0 20000088 [8] 00 00 00 19 00 00 7F 00 ERRORFRAME
protocol-violation{{}{acknowledge-slot}}
bus-error
error-counter-tx-rx{{127}{0}}
can0 553 [6] 1A E4 60 6B DC 07
can0 7E3 [8] 1C 78 95 6E 10 81 AA 40
can0 20C [8] BB 35 13 25 60 0A 56 57
can0 1D0 [8] 48 4A 39 64 76 E6 57 08
can0 43A [1] 40
can0 2CF [7] 03 45 5E 0F 67 33 4C
can0 1CD [8] F9 4D AB 1D 96 A5 67 0E
can0 515 [8] 41 CD F2 5F 68 92 43 16
can0 661 [8] 45 9A 73 69 45 EE 8B 42
can0 41B [1] 55
can0 52F [1] 87
After some more messages there should be also:
can0 20000200 [8] 00 40 00 00 00 00 5F 00 ERRORFRAME
state-change{back-to-error-active}
error-counter-tx-rx{{95}{0}}
For each message sent, the error counter decreases by 8.
root@imx6qrom5420b1:~# ip -s -d link show can0
4: can0: <NOARP,UP,LOWER_UP,ECHO> mtu 16 qdisc pfifo_fast state UNKNOWN
mode DEFAULT group default qlen 10
link/can promiscuity 0
can state ERROR-ACTIVE (berr-counter tx 117 rx 0) restart-ms 0
bitrate 1000000 sample-point 0.750
tq 62 prop-seg 5 phase-seg1 6 phase-seg2 4 sjw 1
hi3110: tseg1 2..16 tseg2 2..8 sjw 1..4 brp 1..64 brp-inc 1
clock 16000000
re-started bus-errors arbit-lost error-warn error-pass bus-off
0 1 0 0 0 0
Strange, some counters got lost.
RX: bytes packets errors dropped overrun mcast
0 0 1 0 0 0
TX: bytes packets errors dropped carrier collsns
120 20 0 0 0 0
Also, any error message should show the bus error counts in data[7,8]:
http://lxr.free-electrons.com/source/drivers/net/can/sja1000/sja1000.c#L408
I can add this in v4 version of the patch (Above log has this patch
applied).
Looks good.
And please check bus-off as well (short-circuiting CAN low and high).
I have not been able to check the bus-off condition by (short-circuiting
CAN low and high). The tec error count remains at 128 when I short the
CAN low and high pins and the status never goes BUSOFF.
You also need to send a message and the short-circuit should be at the
connector of the sending host. What tranceiver is used? Do you know?
You could try to set a different bit-rate on the other CAN controller.
Then try to send or receive messages.
Wolfgang.
