Hi,
I have 2 MCP2515 connected to an OMAP3 3503 (Gumstix Overo). I'm using
kernel 2.6.34 with the MCP251x which is included in the kernel.
I can send and transmit on both interfaces, but when I send a burst of
frames from an embedded system with small / no gab between them I run into
problems. Missing frames, out of order frames and incorrect frames (wrong ID
wrong payload)
When I load the module I get the following from dmesg. I'm not sure what the
"NOHZ: local_softirq_pending 08" is, but that message comes a few times when
I start to send CAN messages to the system.
***************************************************
CAN device driver interface
mcp251x spi1.1: probed
mcp251x spi1.0: probed
mcp251x spi1.0: CNF: 0x01 0xbf 0x02
mcp251x spi1.1: CNF: 0x01 0xbf 0x02
NOHZ: local_softirq_pending 08
NOHZ: local_softirq_pending 08
NOHZ: local_softirq_pending 08
NOHZ: local_softirq_pending 08
NOHZ: local_softirq_pending 08
NOHZ: local_softirq_pending 08
NOHZ: local_softirq_pending 08
NOHZ: local_softirq_pending 08
NOHZ: local_softirq_pending 08
NOHZ: local_softirq_pending 08
can: controller area network core (rev 20090105 abi 8)
NET: Registered protocol family 29
can: raw protocol (rev 20090105)
***************************************************
candump -l any
gives an output similarly to this when I send a burst of 50 frames from the
embedded system.
EXT addr = 0x1000. DLC = 1 and payload incremented from 0x00 to 0x31
***************************************************
(1281087025.330101) can0 00001000#00
(1281087025.330620) can0 00001000#02
(1281087025.330894) can0 00001000#01
(1281087025.331444) can0 00001000#04
(1281087025.331871) can0 00001000#06
(1281087025.332329) can0 00001000#05
(1281087025.333061) can0 00001000#09
(1281087025.333488) can0 00001000#0A
(1281087025.333885) can0 00001000#0B
(1281087025.334160) can0 00001000#0C
(1281087025.334679) can0 00001000#0E
(1281087025.335106) can0 00001000#0F
(1281087025.335503) can0 00001000#10
(1281087025.335777) can0 00001000#11
(1281087025.336296) can0 00001000#13
(1281087025.336723) can0 00001000#14
(1281087025.337120) can0 00001000#15
(1281087025.337395) can0 00001000#16
(1281087025.337944) can0 00001000#18
(1281087025.338371) can0 00001000#19
(1281087025.338768) can0 00001000#1A
(1281087025.339043) can0 00001000#1B
(1281087025.339562) can0 00001000#1D
(1281087025.340172) can0 00001000#1F
(1281087025.340416) can0 00001000#1E
(1281087025.340966) can0 00001000#21
(1281087025.341393) can0 00001000#23
(1281087025.341667) can0 00001000#22
(1281087025.342186) can0 00001000#25
(1281087025.342614) can0 00001000#26
(1281087025.343010) can0 00001000#27
(1281087025.343285) can0 00001000#28
(1281087025.343804) can0 00001000#2A
(1281087025.344231) can0 00001000#2B
(1281087025.344628) can0 00001000#2C
(1281087025.345177) can0 00001000#2D
(1281087025.345513) can0 000#0000000000000000
(1281087025.345849) can0 00001000#30
(1281087025.346306) can0 00001000#31
***************************************************
Output from ifconfig don't report any errors
***************************************************
can0
Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-0
UP RUNNING NOARP MTU:16 Metric:1
RX packets:2912 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:2912 (2.8 KiB) TX bytes:0 (0.0 b)
***************************************************
Any ideas to what could be wrong?
I have tried to change SPI speed and I have also tried the SVN version of
the MCP251x driver (where some changes have been made) but I still get the
errors. Note: When I changed to the SVN version I only changed MCP251X.c
(don't know if that's ok)
I have also tried to enable CAN debug and SPI debug, but don't get any
alarming messages.
Hope someone can give me some ideas to what might be wrong or ideas to
further debug.
Thanks
Benny
_______________________________________________
Socketcan-users mailing list
[email protected]
https://lists.berlios.de/mailman/listinfo/socketcan-users
