On 06/13/2011 08:23 PM, Robin Holt wrote: > My starting point for the kernel is the source provided by freescale > with their P1010RDB board's SDK which is based upon the 2.6.35 kernel.
It's a board with a PowerPC processor, isn't it? I don't know which
driver freescale ships with their SDK. The mainline kernel supports the
flexcan core since 2.6.36 (for ARM), I've never tested the driver on a
powerpc. However it works out of the box for freescales i.MX processors
(mx25, mx38, mx35).
> I have applied all the changes in the 2.6.35.y stable tree maintained
> by Greg K-H. I have configured both the flexcan interface statically
> linked into the kernel and the vcan driver as a loadable module.
>
> I also have the can-utils installed in rootfs.
>
> I have built a simple 3-meter cable with Pins 2, 3, and 7 connected
> together on both ends and pins 2 and 7 terminated with 120 ohm resistors
> on each end.
>
> Following boot, I do/see:
>
> # ip link set can0 type can bitrate 125000 triple-sampling on
> # ifconfig can0 up
> # ip link set can1 type can bitrate 125000 triple-sampling on
I usually don't use triple-sampling.
> # ifconfig can1 up
> # ip -d -s link show can0
> 2: can0: <NOARP,UP,LOWER_UP,ECHO> mtu 16 qdisc pfifo_fast state UNKNOWN qlen
> 10
> link/can
> can <TRIPLE-SAMPLING> state ERROR-ACTIVE (berr-counter tx 0 rx 0)
> restart-ms 0
> bitrate 125000 sample-point 0.875
> tq 500 prop-seg 6 phase-seg1 7 phase-seg2 2 sjw 1
> flexcan: tseg1 4..16 tseg2 2..8 sjw 1..4 brp 1..256 brp-inc 1
> clock 200000000
> 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 -d -s link show can1
> 3: can1: <NOARP,UP,LOWER_UP,ECHO> mtu 16 qdisc pfifo_fast state UNKNOWN qlen
> 10
> link/can
> can <TRIPLE-SAMPLING> state ERROR-ACTIVE (berr-counter tx 0 rx 0)
> restart-ms 0
> bitrate 125000 sample-point 0.875
> tq 500 prop-seg 6 phase-seg1 7 phase-seg2 2 sjw 1
> flexcan: tseg1 4..16 tseg2 2..8 sjw 1..4 brp 1..256 brp-inc 1
> clock 200000000
> 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
> # candump -e any,0:0,#FFFFFFFF &
> # cansend can0 123#1122334455667788
> # can0 20000044 [8] 00 10 00 00 00 00 00 00 ERRORFRAME
> controller-problem{rx-error-passive}
> bus-off
> # ip -d -s link show can0
> 2: can0: <NO-CARRIER,NOARP,UP,ECHO> mtu 16 qdisc pfifo_fast state DOWN qlen 10
> link/can
> can <TRIPLE-SAMPLING> state BUS-OFF (berr-counter tx 0 rx 0) restart-ms 0
> bitrate 125000 sample-point 0.875
> tq 500 prop-seg 6 phase-seg1 7 phase-seg2 2 sjw 1
> flexcan: tseg1 4..16 tseg2 2..8 sjw 1..4 brp 1..256 brp-inc 1
> clock 200000000
> re-started bus-errors arbit-lost error-warn error-pass bus-off
> 0 0 0 1 1 1
> RX: bytes packets errors dropped overrun mcast
> 8 1 0 0 0 0
> TX: bytes packets errors dropped carrier collsns
> 8 0 0 0 0 0
> # ip -d -s link show can1
> 3: can1: <NOARP,UP,LOWER_UP,ECHO> mtu 16 qdisc pfifo_fast state UNKNOWN qlen
> 10
> link/can
> can <TRIPLE-SAMPLING> state ERROR-ACTIVE (berr-counter tx 0 rx 0)
> restart-ms 0
> bitrate 125000 sample-point 0.875
> tq 500 prop-seg 6 phase-seg1 7 phase-seg2 2 sjw 1
> flexcan: tseg1 4..16 tseg2 2..8 sjw 1..4 brp 1..256 brp-inc 1
> clock 200000000
> 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
>
>
> Any help/guidance will be greatly appreciated.
Check the board documentation if external termination is needed. Recheck
your cabling, you need a 1-to-1 cable connecting pins 2-2, 3-3 and 7-7,
if sub-d on the board has the standard CAN pinout[1]
cheers, Marc
[1] http://www.interfacebus.com/Can_Bus_Connector_Pinout.html
--
Pengutronix e.K. | Marc Kleine-Budde |
Industrial Linux Solutions | Phone: +49-231-2826-924 |
Vertretung West/Dortmund | Fax: +49-5121-206917-5555 |
Amtsgericht Hildesheim, HRA 2686 | http://www.pengutronix.de |
signature.asc
Description: OpenPGP digital signature
_______________________________________________ Socketcan-core mailing list [email protected] https://lists.berlios.de/mailman/listinfo/socketcan-core
