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Date: Sun, 11 Dec 2011 19:33:18 +0100
From: Wolfgang Zarre <info@...ax.com>
To: Wolfgang Grandegger <wg@...ndegger.com>
CC: Oliver Hartkopp <socketcan@...tkopp.net>, netdev@...r.kernel.org,
linux-can@...r.kernel.org, socketcan-users@...ts.berlios.de,
IreneV <boir1@...dex.ru>,
Stanislav Yelenskiy <stanislavelensky@...oo.com>
Subject: Re: [PATCH net-next v2 2/4] can: cc770: add legacy ISA bus driver
for the CC770 and AN82527
Hello Wolfgang,
> On 12/07/2011 02:42 PM, Wolfgang Grandegger wrote:
>> Hi Wolfgang,
>>
>> On 12/06/2011 10:08 PM, Wolfgang Zarre wrote:
>>> Hello Wolfgang,
>>>
>>>> Hi Wolfgang,
>>>>
>>>> On 12/04/2011 07:47 PM, Wolfgang Zarre wrote:
>> ...
>>>>>
>>>>> Should be not a problem at all.
>>>>
>>>> Great, thanks.
>>>
>>> Ok, here we go:
>>>
>>> uname -r: 3.2.0-rc4
>>>
>>> modprobe cc770_isa irq=0xa port=0x384 indirect=1 cir=0x61 bcr=0x4A
>>> ip link set can0 up type can bitrate 500000;
>>>
>>> kern.log
>>> Dec 6 20:42:19 svserv01 kernel: [ 2111.900735] CAN device driver interface
>>> Dec 6 20:42:19 svserv01 kernel: [ 2111.903072] cc770: CAN netdevice driver
>>> Dec 6 20:42:19 svserv01 kernel: [ 2111.904692] cc770_isa: platform
>>> device 0: port=0x384, mem=0x0, irq=10
>>> Dec 6 20:42:19 svserv01 kernel: [ 2111.904726] cc770_isa cc770_isa.0:
>>> probing idx=0: port=0x384, mem=0x0, irq=10
>>> Dec 6 20:42:19 svserv01 kernel: [ 2111.904779] cc770_isa cc770_isa.0:
>>> (unregistered net_device): i82527 mode with additional functions
>>> Dec 6 20:42:19 svserv01 kernel: [ 2111.906407] cc770_isa cc770_isa.0:
>>> device registered (reg_base=0x00000384, irq=10)
>>> Dec 6 20:42:19 svserv01 kernel: [ 2111.906457] cc770_isa: driver for
>>> max. 8 devices registered
>>> 6 20:44:17 svserv01 kernel: [ 2229.886845] cc770_isa cc770_isa.0:
>>> can0: setting BTR0=0x00 BTR1=0x1c
>>> Dec 6 20:44:17 svserv01 kernel: [ 2229.886920] cc770_isa cc770_isa.0:
>>> can0: Message object 15 for RX data, RTR, SFF and EFF
>>> Dec 6 20:44:17 svserv01 kernel: [ 2229.886937] cc770_isa cc770_isa.0:
>>> can0: Message object 11 for TX data, RTR, SFF and EFF
>>> Dec 6 20:52:40 svserv01 kernel: [ 2733.172845] can: controller area
>>> network core (rev 20090105 abi 8)
>>> Dec 6 20:52:40 svserv01 kernel: [ 2733.172967] NET: Registered protocol
>>> family 29
>>> Dec 6 20:52:40 svserv01 kernel: [ 2733.178187] can: raw protocol (rev
>>> 20090105)
>>>
>>>
>>> ip -d -s link show
>>> 4: can0:<NOARP,UP,LOWER_UP,ECHO> mtu 16 qdisc pfifo_fast state UNKNOWN
>>> qlen 10
>>> link/can
>>> can state ERROR-ACTIVE (berr-counter tx 0 rx 0) restart-ms 0
>>> bitrate 500000 sample-point 0.875
>>> tq 125 prop-seg 6 phase-seg1 7 phase-seg2 2 sjw 1
>>> cc770: 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 0 0 0
>>> RX: bytes packets errors dropped overrun mcast
>>> 0 0 0 0 0 0
>>> TX: bytes packets errors dropped carrier collsns
>>> 0 0 0 0 0 0
>>>
>>>
>>> After rebooting the PLC with proprietary buggy kernel:
>>> 4: can0:<NOARP,UP,LOWER_UP,ECHO> mtu 16 qdisc pfifo_fast state UNKNOWN
>>> qlen 10
>>> link/can
>>> can state ERROR-ACTIVE (berr-counter tx 0 rx 0) restart-ms 0
>>> bitrate 500000 sample-point 0.875
>>> tq 125 prop-seg 6 phase-seg1 7 phase-seg2 2 sjw 1
>>> cc770: 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 0 0 0
>>> RX: bytes packets errors dropped overrun mcast
>>> 414 267 0 267 0 0
>>> TX: bytes packets errors dropped carrier collsns
>>> 0 0 0 0 0 0
>>>
>>>
>>>
>>> After sending 100,000 PDO's with 13ms displacement:
>>> 4: can0:<NOARP,UP,LOWER_UP,ECHO> mtu 16 qdisc pfifo_fast state UNKNOWN
>>> qlen 10
>>> link/can
>>> can state ERROR-ACTIVE (berr-counter tx 0 rx 0) restart-ms 0
>>> bitrate 500000 sample-point 0.875
>>> tq 125 prop-seg 6 phase-seg1 7 phase-seg2 2 sjw 1
>>> cc770: 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 0 0 0
>>> RX: bytes packets errors dropped overrun mcast
>>> 4544 4284 0 331 0 0
>>> TX: bytes packets errors dropped carrier collsns
>>> 802660 202653 0 0 0 0
>>>
>>>
>>> The dropped ones of RX may be the not processed input packages and
>>> therefore ok.
>>>
>>> Let me know if You need more or some other tests.
>>
>> You could provoke some state changes or bus-off conditions to see if the
>> berr-counter shows reasonable results. I'm currently consolidating and
>> unifying error state and bus-off handling. Would be nice if you could do
>> some further tests when I have the patches ready...
>
> I just pushed the mentioned modifications to the "devel" branch of my
> "wg-linux-can-next" [1] repository. You can get it as shown below:
>
> $ git clone --reference=<some-recent-net-next-tree> \
> git://gitorious.org/~wgrandegger/linux-can/wg-linux-can-next.git
> $ git checkout -b devel devel
>
> [1] https://gitorious.org/~wgrandegger/linux-can/wg-linux-can-next
>
> Wolfgang.
OK, I was trying so far and You will find below the results.
Just FYI the states on the PLC side couldn't be verified because the function
provided by the manufacturer is not working at all and CAN analyser was not
available.
We are running CANopen and therefore the PLC will send automatically a heartbeat.
I produced the bus-off state through a short circuit between L/H which was
working as expected.
A bit odd was that on the second try I had to reload the module
because a ip down/up was not enough.
Let me know if You would need further tests or different procedure.
Starting procedure:
Cable disconnected
Restarting PC with new driver
Restarting PLC
Connecting cable
modprobe cc770_isa irq=0xa port=0x384 indirect=1 cir=0x61 bcr=0x4A
dmesg:
[ 221.996751] CAN device driver interface
[ 222.036036] cc770: CAN netdevice driver
[ 222.054260] cc770_isa: platform device 0: port=0x384, mem=0x0, irq=10
[ 222.054293] cc770_isa cc770_isa.0: probing idx=0: port=0x384, mem=0x0, irq=10
[ 222.054343] cc770_isa cc770_isa.0: (unregistered net_device): i82527 mode with additional functions
[ 222.055925] cc770_isa cc770_isa.0: device registered (reg_base=0x00000384, irq=10)
[ 222.055972] cc770_isa: driver for max. 8 devices registered
ip -d -s link show can0
4: can0: <NOARP,ECHO> mtu 16 qdisc noop state DOWN qlen 10
link/can
can state STOPPED (berr-counter tx 92 rx 103) restart-ms 0
bitrate 0 sample-point 0.000
tq 0 prop-seg 0 phase-seg1 0 phase-seg2 0 sjw 0
cc770: 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 0 0 0
RX: bytes packets errors dropped overrun mcast
0 0 0 0 0 0
TX: bytes packets errors dropped carrier collsns
0 0 0 0 0 0
ip link set can0 up type can bitrate 500000
dmesg:
[ 287.871983] cc770_isa cc770_isa.0: can0: setting BTR0=0x00 BTR1=0x1c
[ 287.872103] cc770_isa cc770_isa.0: can0: Message object 15 for RX data, RTR, SFF and EFF
[ 287.872119] cc770_isa cc770_isa.0: can0: Message object 11 for TX data, RTR, SFF and EFF
ip -d -s link show can0
4: can0: <NOARP,UP,LOWER_UP,ECHO> mtu 16 qdisc pfifo_fast state UNKNOWN qlen 10
link/can
can state ERROR-ACTIVE (berr-counter tx 0 rx 0) restart-ms 0
bitrate 500000 sample-point 0.875
tq 125 prop-seg 6 phase-seg1 7 phase-seg2 2 sjw 1
cc770: 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 0 0 0
RX: bytes packets errors dropped overrun mcast
0 0 0 0 0 0
TX: bytes packets errors dropped carrier collsns
0 0 0 0 0 0
PLC stays in unknown CAN state (as usual )
Rebooting PLC
dmesg:
[ 466.169054] can: controller area network core (rev 20090105 abi 8)
[ 466.169178] NET: Registered protocol family 29
[ 466.174339] can: raw protocol (rev 20090105)
PLC is sending heartbeat
Starting PC heartbeats
ip -d -s link show can0
4: can0: <NOARP,UP,LOWER_UP,ECHO> mtu 16 qdisc pfifo_fast state UNKNOWN qlen 10
link/can
can state ERROR-ACTIVE (berr-counter tx 0 rx 0) restart-ms 0
bitrate 500000 sample-point 0.875
tq 125 prop-seg 6 phase-seg1 7 phase-seg2 2 sjw 1
cc770: 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 0 0 0
RX: bytes packets errors dropped overrun mcast
513 365 0 0 0 0
TX: bytes packets errors dropped carrier collsns
20 20 0 0 0 0
Producing L/H short circuit for 2 seconds
dmesg:
[ 885.409058] cc770_isa cc770_isa.0: can0: status interrupt (0x5b)
[ 885.420475] cc770_isa cc770_isa.0: can0: status interrupt (0xc5)
[ 885.420496] cc770_isa cc770_isa.0: can0: bus-off
ip -d -s link show can0
4: can0: <NO-CARRIER,NOARP,UP,ECHO> mtu 16 qdisc pfifo_fast state DOWN qlen 10
link/can
can state BUS-OFF (berr-counter tx 92 rx 103) restart-ms 0
bitrate 500000 sample-point 0.875
tq 125 prop-seg 6 phase-seg1 7 phase-seg2 2 sjw 1
cc770: 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 1 0 1
RX: bytes packets errors dropped overrun mcast
544 382 0 0 0 0
TX: bytes packets errors dropped carrier collsns
30 29 0 0 0 0
Sending and receiving stops.
Trying to recover on PC:
ip link set can0 down;
ip -d -s link show can0
4: can0: <NOARP,ECHO> mtu 16 qdisc pfifo_fast state DOWN qlen 10
link/can
can state STOPPED (berr-counter tx 92 rx 103) restart-ms 0
bitrate 500000 sample-point 0.875
tq 125 prop-seg 6 phase-seg1 7 phase-seg2 2 sjw 1
cc770: 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 1 0 1
RX: bytes packets errors dropped overrun mcast
544 382 0 0 0 0
TX: bytes packets errors dropped carrier collsns
30 29 0 1 0 0
ip link set can0 up type can bitrate 500000;
dmesg:
[ 1090.937778] cc770_isa cc770_isa.0: can0: setting BTR0=0x00 BTR1=0x1c
[ 1090.937869] cc770_isa cc770_isa.0: can0: Message object 15 for RX data, RTR, SFF and EFF
[ 1090.937885] cc770_isa cc770_isa.0: can0: Message object 11 for TX data, RTR, SFF and EFF
[ 1090.938050] ADDRCONF(NETDEV_CHANGE): can0: link becomes ready
[ 1090.940769] cc770_isa cc770_isa.0: can0: status interrupt (0x5)
ip -d -s link show can0
4: can0: <NOARP,UP,LOWER_UP,ECHO> mtu 16 qdisc pfifo_fast state UP qlen 10
link/can
can state ERROR-ACTIVE (berr-counter tx 0 rx 0) restart-ms 0
bitrate 500000 sample-point 0.875
tq 125 prop-seg 6 phase-seg1 7 phase-seg2 2 sjw 1
cc770: 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 1 0 1
RX: bytes packets errors dropped overrun mcast
552 383 0 0 0 0
TX: bytes packets errors dropped carrier collsns
30 29 0 1 0 0
PLC in unknown state but not sending heartbeat,
Rebooting PLC
PLC sends heartbeat but PC cannot send (buffer overrun)
ip -d -s link show can0
4: can0: <NOARP,UP,LOWER_UP,ECHO> mtu 16 qdisc pfifo_fast state UP qlen 10
link/can
can state ERROR-ACTIVE (berr-counter tx 0 rx 0) restart-ms 0
bitrate 500000 sample-point 0.875
tq 125 prop-seg 6 phase-seg1 7 phase-seg2 2 sjw 1
cc770: 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 1 0 1
RX: bytes packets errors dropped overrun mcast
582 398 0 0 0 0
TX: bytes packets errors dropped carrier collsns
30 29 0 1 0 0
Reloading driver
modprobe -r cc770_isa
dmesg:
[ 1457.133359] cc770: driver removed
modprobe cc770_isa irq=0xa port=0x384 indirect=1 cir=0x61 bcr=0x4A
dmesg:
[ 1474.051479] CAN device driver interface
[ 1474.053180] cc770: CAN netdevice driver
[ 1474.054416] cc770_isa: platform device 0: port=0x384, mem=0x0, irq=10
[ 1474.054449] cc770_isa cc770_isa.0: probing idx=0: port=0x384, mem=0x0, irq=10
[ 1474.054500] cc770_isa cc770_isa.0: (unregistered net_device): i82527 mode with additional functions
[ 1474.056097] cc770_isa cc770_isa.0: device registered (reg_base=0x00000384, irq=10)
[ 1474.056146] cc770_isa: driver for max. 8 devices registered
ip link set can0 up type can bitrate 500000;
[ 1484.586697] cc770_isa cc770_isa.0: can0: setting BTR0=0x00 BTR1=0x1c
[ 1484.586775] cc770_isa cc770_isa.0: can0: Message object 15 for RX data, RTR, SFF and EFF
[ 1484.586791] cc770_isa cc770_isa.0: can0: Message object 11 for TX data, RTR, SFF and EFF
Receiving and sending heartbeat
ip -d -s link show can0
5: can0: <NOARP,UP,LOWER_UP,ECHO> mtu 16 qdisc pfifo_fast state UNKNOWN qlen 10
link/can
can state ERROR-ACTIVE (berr-counter tx 0 rx 0) restart-ms 0
bitrate 500000 sample-point 0.875
tq 125 prop-seg 6 phase-seg1 7 phase-seg2 2 sjw 1
cc770: 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 0 0 0
RX: bytes packets errors dropped overrun mcast
158 157 0 0 0 0
TX: bytes packets errors dropped carrier collsns
16 16 0 0 0 0
-----------------------------------------
Producing L/H short circuit again for 2 seconds
dmesg:
[ 1719.018116] cc770_isa cc770_isa.0: can0: status interrupt (0x5b)
ip -d -s link show can0
5: can0: <NOARP,UP,LOWER_UP,ECHO> mtu 16 qdisc pfifo_fast state UNKNOWN qlen 10
link/can
can state ERROR-WARNING (berr-counter tx 128 rx 128) restart-ms 0
bitrate 500000 sample-point 0.875
tq 125 prop-seg 6 phase-seg1 7 phase-seg2 2 sjw 1
cc770: 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 1 0 0
RX: bytes packets errors dropped overrun mcast
271 263 0 0 0 0
TX: bytes packets errors dropped carrier collsns
88 87 0 0 0 0
Sending and receiving stops.
Trying to recover on PC with driver reload:
modprobe -r cc770_isa
dmesg:
[ 1820.358418] cc770: driver removed
modprobe cc770_isa irq=0xa port=0x384 indirect=1 cir=0x61 bcr=0x4A
dmesg:
[ 1826.810914] CAN device driver interface
[ 1826.812619] cc770: CAN netdevice driver
[ 1826.814126] cc770_isa: platform device 0: port=0x384, mem=0x0, irq=10
[ 1826.814158] cc770_isa cc770_isa.0: probing idx=0: port=0x384, mem=0x0, irq=10
[ 1826.814211] cc770_isa cc770_isa.0: (unregistered net_device): i82527 mode with additional functions
[ 1826.815789] cc770_isa cc770_isa.0: device registered (reg_base=0x00000384, irq=10)
[ 1826.815839] cc770_isa: driver for max. 8 devices registered
ip -d -s link show can0
6: can0: <NOARP,ECHO> mtu 16 qdisc noop state DOWN qlen 10
link/can
can state STOPPED (berr-counter tx 92 rx 103) restart-ms 0
bitrate 0 sample-point 0.000
tq 0 prop-seg 0 phase-seg1 0 phase-seg2 0 sjw 0
cc770: 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 0 0 0
RX: bytes packets errors dropped overrun mcast
0 0 0 0 0 0
TX: bytes packets errors dropped carrier collsns
0 0 0 0 0 0
ip link set can0 up type can bitrate 500000;
dmesg:
[ 1861.776977] cc770_isa cc770_isa.0: can0: setting BTR0=0x00 BTR1=0x1c
[ 1861.777102] cc770_isa cc770_isa.0: can0: Message object 15 for RX data, RTR, SFF and EFF
[ 1861.777118] cc770_isa cc770_isa.0: can0: Message object 11 for TX data, RTR, SFF and EFF
ip -d -s link show can0
6: can0: <NOARP,UP,LOWER_UP,ECHO> mtu 16 qdisc pfifo_fast state UNKNOWN qlen 10
link/can
can state ERROR-ACTIVE (berr-counter tx 128 rx 128) restart-ms 0
bitrate 500000 sample-point 0.875
tq 125 prop-seg 6 phase-seg1 7 phase-seg2 2 sjw 1
cc770: 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 0 0 0
RX: bytes packets errors dropped overrun mcast
0 0 0 0 0 0
TX: bytes packets errors dropped carrier collsns
1 0 0 0 0 0
PLC in unknown state
Unable to send and receive heartbeat
Rebooting PLC
ip -d -s link show can0
6: can0: <NOARP,UP,LOWER_UP,ECHO> mtu 16 qdisc pfifo_fast state UNKNOWN qlen 10
link/can
can state ERROR-ACTIVE (berr-counter tx 115 rx 0) restart-ms 0
bitrate 500000 sample-point 0.875
tq 125 prop-seg 6 phase-seg1 7 phase-seg2 2 sjw 1
cc770: 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 0 0 0
RX: bytes packets errors dropped overrun mcast
0 0 0 0 0 0
TX: bytes packets errors dropped carrier collsns
13 13 0 0 0 0
ip -d -s link show can0
6: can0: <NOARP,UP,LOWER_UP,ECHO> mtu 16 qdisc pfifo_fast state UNKNOWN qlen 10
link/can
can state ERROR-ACTIVE (berr-counter tx 107 rx 0) restart-ms 0
bitrate 500000 sample-point 0.875
tq 125 prop-seg 6 phase-seg1 7 phase-seg2 2 sjw 1
cc770: 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 0 0 0
RX: bytes packets errors dropped overrun mcast
30 15 0 0 0 0
TX: bytes packets errors dropped carrier collsns
21 21 0 0 0 0
dmesg:
[ 2102.085718] cc770_isa cc770_isa.0: can0: status interrupt (0x18)
ip -d -s link show can0
6: can0: <NOARP,UP,LOWER_UP,ECHO> mtu 16 qdisc pfifo_fast state UNKNOWN qlen 10
link/can
can state ERROR-ACTIVE (berr-counter tx 32 rx 0) restart-ms 0
bitrate 500000 sample-point 0.875
tq 125 prop-seg 6 phase-seg1 7 phase-seg2 2 sjw 1
cc770: 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 0 0 0
RX: bytes packets errors dropped overrun mcast
310 156 0 0 0 0
TX: bytes packets errors dropped carrier collsns
96 96 0 0 0 0
And with counters on zero:
ip -d -s link show can0
6: can0: <NOARP,UP,LOWER_UP,ECHO> mtu 16 qdisc pfifo_fast state UNKNOWN qlen 10
link/can
can state ERROR-ACTIVE (berr-counter tx 0 rx 0) restart-ms 0
bitrate 500000 sample-point 0.875
tq 125 prop-seg 6 phase-seg1 7 phase-seg2 2 sjw 1
cc770: 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 0 0 0
RX: bytes packets errors dropped overrun mcast
358 204 0 0 0 0
TX: bytes packets errors dropped carrier collsns
129 129 0 0 0 0
-----------------------------------------
Disconnecting cable for around 4 seconds:
dmesg:
[ 2339.660283] cc770_isa cc770_isa.0: can0: status interrupt (0x5b)
ip -d -s link show can0
6: can0: <NOARP,UP,LOWER_UP,ECHO> mtu 16 qdisc pfifo_fast state UNKNOWN qlen 10
link/can
can state ERROR-WARNING (berr-counter tx 128 rx 128) restart-ms 0
bitrate 500000 sample-point 0.875
tq 125 prop-seg 6 phase-seg1 7 phase-seg2 2 sjw 1
cc770: 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 1 0 0
RX: bytes packets errors dropped overrun mcast
459 298 0 0 0 0
TX: bytes packets errors dropped carrier collsns
193 192 0 0 0 0
Connecting again:
ip -d -s link show can0
6: can0: <NOARP,UP,LOWER_UP,ECHO> mtu 16 qdisc pfifo_fast state UNKNOWN qlen 10
link/can
can state ERROR-WARNING (berr-counter tx 120 rx 0) restart-ms 0
bitrate 500000 sample-point 0.875
tq 125 prop-seg 6 phase-seg1 7 phase-seg2 2 sjw 1
cc770: 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 1 0 0
RX: bytes packets errors dropped overrun mcast
473 311 0 0 0 0
TX: bytes packets errors dropped carrier collsns
200 200 0 0 0 0
After some time (around 125 seconds):
dmesg:
[ 2387.172008] cc770_isa cc770_isa.0: can0: status interrupt (0x18)
ip -d -s link show can0
6: can0: <NOARP,UP,LOWER_UP,ECHO> mtu 16 qdisc pfifo_fast state UNKNOWN qlen 10
link/can
can state ERROR-ACTIVE (berr-counter tx 29 rx 0) restart-ms 0
bitrate 500000 sample-point 0.875
tq 125 prop-seg 6 phase-seg1 7 phase-seg2 2 sjw 1
cc770: 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 1 0 0
RX: bytes packets errors dropped overrun mcast
616 447 0 0 0 0
TX: bytes packets errors dropped carrier collsns
291 291 0 0 0 0
-----------------------------------------
Disconnecting cable for around 55 seconds:
dmesg:
[ 2658.896959] cc770_isa cc770_isa.0: can0: status interrupt (0x5b)
ip -d -s link show can0
6: can0: <NOARP,UP,LOWER_UP,ECHO> mtu 16 qdisc pfifo_fast state UNKNOWN qlen 10
link/can
can state ERROR-WARNING (berr-counter tx 128 rx 128) restart-ms 0
bitrate 500000 sample-point 0.875
tq 125 prop-seg 6 phase-seg1 7 phase-seg2 2 sjw 1
cc770: 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 2 0 0
RX: bytes packets errors dropped overrun mcast
797 621 0 0 0 0
TX: bytes packets errors dropped carrier collsns
408 407 0 0 0 0
ip -d -s link show can0
6: can0: <NOARP,UP,LOWER_UP,ECHO> mtu 16 qdisc pfifo_fast state UNKNOWN qlen 10
link/can
can state ERROR-WARNING (berr-counter tx 112 rx 0) restart-ms 0
bitrate 500000 sample-point 0.875
tq 125 prop-seg 6 phase-seg1 7 phase-seg2 2 sjw 1
cc770: 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 2 0 0
RX: bytes packets errors dropped overrun mcast
837 661 0 0 0 0
TX: bytes packets errors dropped carrier collsns
423 423 0 0 0 0
dmesg:
[ 2765.805486] cc770_isa cc770_isa.0: can0: status interrupt (0x18)
ip -d -s link show can0
6: can0: <NOARP,UP,LOWER_UP,ECHO> mtu 16 qdisc pfifo_fast state UNKNOWN qlen 10
link/can
can state ERROR-ACTIVE (berr-counter tx 94 rx 0) restart-ms 0
bitrate 500000 sample-point 0.875
tq 125 prop-seg 6 phase-seg1 7 phase-seg2 2 sjw 1
cc770: 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 2 0 0
RX: bytes packets errors dropped overrun mcast
872 689 0 0 0 0
TX: bytes packets errors dropped carrier collsns
441 441 0 0 0 0
Thanks a lot.
Wolfgang
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