[Xenomai] RTCAN problem with PEAK PCIe & miniPCIe

[Xenomai] RTCAN problem with PEAK PCIe & miniPCIe

[Wuwei He]

Hello, all

I have a problem with the PEAK PCIe card: I could never receive CAN
messages and can only send one message.


Using /usr/xenomai/bin/rtcansend and rtcanrecv:
When receiving, RX_Counter does not increase.
When sending, TX_Counter increase to 1, and message is received from the
receive end. Then sending a second message, it gets blocked and no
response. Checking with /proc/rtcan/devices, no error status though.

I am using Xenomai 2.6.3, Linux kernel 3.5.7, under Ubuntu 12.04.
Same results for two different PC -- hardware. Tested with PEAK dual PCIe
and dual miniPCIe.
Tried with SHARED_IRQ enabled. When not enabled, the devices won't be
loaded.
Also, when using dual PCI card, no such problems. Same error behavior with
dual PCIe and miniPCIe.

Would any one knows what kind of problem I am in?

Any information or links could be very much helping.
Thanks!

Wuwei "Will" He
Miami FL
US

Re: [Xenomai] RTCAN problem with PEAK PCIe & miniPCIe

[Wuwei He]

PS.

Also, the same results with the one channel PCIe card.



On Tue, Dec 29, 2015 at 11:16 AM, Wuwei He <whe@neocisinc.com> wrote:

> Hello, all
>
> I have a problem with the PEAK PCIe card: I could never receive CAN
> messages and can only send one message.
>
>
> Using /usr/xenomai/bin/rtcansend and rtcanrecv:
> When receiving, RX_Counter does not increase.
> When sending, TX_Counter increase to 1, and message is received from the
> receive end. Then sending a second message, it gets blocked and no
> response. Checking with /proc/rtcan/devices, no error status though.
>
> I am using Xenomai 2.6.3, Linux kernel 3.5.7, under Ubuntu 12.04.
> Same results for two different PC -- hardware. Tested with PEAK dual PCIe
> and dual miniPCIe.
> Tried with SHARED_IRQ enabled. When not enabled, the devices won't be
> loaded.
> Also, when using dual PCI card, no such problems. Same error behavior with
> dual PCIe and miniPCIe.
>
> Would any one knows what kind of problem I am in?
>
> Any information or links could be very much helping.
> Thanks!
>
> Wuwei "Will" He
> Miami FL
> US
>

Re: [Xenomai] RTCAN problem with PEAK PCIe & miniPCIe

[Wolfgang Grandegger]

Hello,

please don't drop the CC to the Xenomai mailing list.

Am 14.01.2016 um 22:24 schrieb Wuwei He:
>
>
> Hello,
>
> With my limited understanding of Xenomai, I assume that these problems
> would not appear if we use Xenomai in single kernel configuration?

With "single kernel configuration" you mean Xenomai 3!? Good question!
I think it will not be good for the latency either.

> Also, I tried to google and did not find a "single kernel Xenomai
> installation" for people who don't know much about Linux kernel hacks.
> Such, I used info from a lot of links like this:
> http://jbohren.com/articles/xenomai-precise/
> Would you know good place to start with? While I am fight through this
> whole new domain.

I didn't work with Xenomai 3 recently. Maybe other ppl on this list can 
help.

Wolfgang.

> On Wed, Dec 30, 2015 at 2:36 AM, Wolfgang Grandegger <wg@grandegger.com
> <mailto:wg@grandegger.com>> wrote:
>
>     Hello,
>
>     Am 29.12.2015 um 20:48 schrieb Wuwei He:
>
>         Hello,
>
>         Thanks for your response. Here is what happens and the logs.
>
>         I have the single channel PCIe card plugged in. I sent  a CAN
>         message
>         from my Windows machine over a CAN cable, and received no
>         message from
>         Xenomai:
>         Name___________ _Baudrate State___ TX_Counter RX_Counter ____Errors
>         rtcan0            1000000 active            0          0          0
>
>         Then, sending from Xenomai:
>         /usr/xenomai/bin/rtcansend rtcan0 --verbose 0xdd 0xaa
>         interface rtcan0
>         s=0, ifr_name=rtcan0
>         <0x001> [2] dd aa
>         Cleaning up...
>
>         I received from Windows.   And Xenomai end gives:
>         cat /proc/rtcan/devices
>         Name___________ _Baudrate State___ TX_Counter RX_Counter ____Errors
>         rtcan0            1000000 active            1          0          0
>
>         After that, I saved all the logs.
>
>         =====
>
>         You can find logs named: dmesg_result: is from dmesg > etc.
>         Includes:
>         dmesg
>
>
>
>
>         lspci
>         proc/interrupts/
>
>
>
>     $ grep " 16:" proc_interrupts_result
>       16:          0          0          1          0   IO-APIC-fasteoi
>     ehci_hcd:usb1
>
>     The irq 16 is shared with the Linux device "ehci_hcd:usb1".
>
>         proc/xenomai/irq
>
>
>     $ cat proc_xenomai_irq_result
>     IRQ         CPU0        CPU1        CPU2        CPU3
>       16:           6           0         915          79         SJA1000
>
>     The device seem to get interrupts but they may come from the Linux
>     device "ehci_hcd:usb1". Anyway, Xenomai devices should not share IRQ
>     lines with Linux devices. See:
>
>
>     https://xenomai.org/2014/06/what-if-xenomai-and-linux-devices-share-the-same-irq/
>
>     Try using a different PCI slot, check and maybe modify the bios
>     settings to use a different IRQ or unload the Linux device using
>     that IRQ as well.
>
>
>         I am not qualified to debug IRQ problems and now start to learn
>         about
>         it. If you could give them a look, it would help me a lot.
>         *Still, sorry for sending all the log files and I really
>         appreciate your
>         time.
>
>
>     You are welcome.
>
>     Wolfgang.
>
>         On Tue, Dec 29, 2015 at 2:11 PM, Wolfgang Grandegger
>         <wg@grandegger.com <mailto:wg@grandegger.com>
>         <mailto:wg@grandegger.com <mailto:wg@grandegger.com>>> wrote:
>
>              Am 29.12.2015 um 17:16 schrieb Wuwei He:
>
>                  Hello, all
>
>                  I have a problem with the PEAK PCIe card: I could never
>         receive CAN
>                  messages and can only send one message.
>
>
>                  Using /usr/xenomai/bin/rtcansend and rtcanrecv:
>                  When receiving, RX_Counter does not increase.
>                  When sending, TX_Counter increase to 1, and message is
>         received
>                  from the
>                  receive end. Then sending a second message, it gets
>         blocked and no
>                  response. Checking with /proc/rtcan/devices, no error
>         status though.
>
>
>              Interrupts seems not to be triggered. Could you please post the
>              output of:
>
>                 # cat /proc/xenomai/irq
>                 # cat /proc/interrupts
>
>                  I am using Xenomai 2.6.3, Linux kernel 3.5.7, under
>         Ubuntu 12.04.
>                  Same results for two different PC -- hardware. Tested
>         with PEAK
>                  dual PCIe
>                  and dual miniPCIe.
>                  Tried with SHARED_IRQ enabled. When not enabled, the
>         devices
>                  won't be
>                  loaded.
>
>
>              You may need it because both CAN controllers share one
>         interrupt line.
>
>                  Also, when using dual PCI card, no such problems. Same
>         error
>                  behavior with
>                  dual PCIe and miniPCIe.
>
>                  Would any one knows what kind of problem I am in?
>
>
>              Also the output of "lspci -vv" for the PEAK PCIe cards
>         would provide
>              some useful input.
>
>              Wolfgang.
>
>
>