[Xenomai] Bosch CCAN/DCAN driver for RTDM

[Xenomai] Bosch CCAN/DCAN driver for RTDM

[Steve B]

Hello,
I have put together a quick port of the Linux driver for CCAN/DCAN to work
with RTDM, thanks to Wolfgang Grandegger's Flexcan driver port as an
example.

It's not thoroughly/formally tested, but it works with rtcansend and
rtcanrecv, and works well with my application sending and receiving a few
hundred frames per second at 500k baud, which I think is a good enough
initial test for me.
I can also give the "rtt" test a shot when I have time.

Is there anyone out there who would like to test this? I am wondering what
is the procedure to submit, should I create a patch and attach? I haven't
looked at how to add it into the kernel build process, I have just built it
in its own separate place so far.

Steve

Re: [Xenomai] Bosch CCAN/DCAN driver for RTDM

[Philippe Gerum]

On 02/09/2015 06:42 PM, Steve B wrote:
> Hello,
> I have put together a quick port of the Linux driver for CCAN/DCAN to work
> with RTDM, thanks to Wolfgang Grandegger's Flexcan driver port as an
> example.
> 
> It's not thoroughly/formally tested, but it works with rtcansend and
> rtcanrecv, and works well with my application sending and receiving a few
> hundred frames per second at 500k baud, which I think is a good enough
> initial test for me.
> I can also give the "rtt" test a shot when I have time.
> 
> Is there anyone out there who would like to test this? I am wondering what
> is the procedure to submit, should I create a patch and attach? I haven't
> looked at how to add it into the kernel build process, I have just built it
> in its own separate place so far.
> 

Posting the patch to this list is fine.

-- 
Philippe.

Re: [Xenomai] Bosch CCAN/DCAN driver for RTDM

[Alfred Koegel]

Steve B <sbattazzo <at> gmail.com> writes:

> 
> Hello,
> I have put together a quick port of the Linux driver for CCAN/DCAN to work
> with RTDM, thanks to Wolfgang Grandegger's Flexcan driver port as an
> example.
> 
> It's not thoroughly/formally tested, but it works with rtcansend and
> rtcanrecv, and works well with my application sending and receiving a few
> hundred frames per second at 500k baud, which I think is a good enough
> initial test for me.
> I can also give the "rtt" test a shot when I have time.
> 
> Is there anyone out there who would like to test this? I am wondering what
> is the procedure to submit, should I create a patch and attach? I haven't
> looked at how to add it into the kernel build process, I have just built it
> in its own separate place so far.
> 
> Steve
> 

Hello Steve,
I intended to do a port a few months ago, because i started a project with a  
Atom™ E640 cpu. The internal can controller is a clone of the BOSCH ccan
module and your driver should run on this hardware as well. If you can post
me the patch i can try to get it going on my hardware (the project is frozen
at the moment due to other hardware related problems).
Alfred

Re: [Xenomai] Bosch CCAN/DCAN driver for RTDM

[Wolfgang Grandegger]

Hi Steve,

On Tue, 10 Feb 2015 14:38:32 +0000 (UTC), Alfred Koegel <akoegel@gmx.de>
wrote:
> Steve B <sbattazzo <at> gmail.com> writes:
> 
>> 
>> Hello,
>> I have put together a quick port of the Linux driver for CCAN/DCAN to
>> work
>> with RTDM, thanks to Wolfgang Grandegger's Flexcan driver port as an
>> example.
>> 
>> It's not thoroughly/formally tested, but it works with rtcansend and
>> rtcanrecv, and works well with my application sending and receiving a
few
>> hundred frames per second at 500k baud, which I think is a good enough
>> initial test for me.
>> I can also give the "rtt" test a shot when I have time.
>> 
>> Is there anyone out there who would like to test this? I am wondering
>> what
>> is the procedure to submit, should I create a patch and attach? I
haven't
>> looked at how to add it into the kernel build process, I have just
built
>> it
>> in its own separate place so far.

Unfortunately I don't have hardware at hand to test the driver but I could
assist in getting it included into:

"http://www.rts.uni-hannover.de/xenomai/lxr/source/ksrc/drivers/can/c_can"

With a proper Kconfig it should automatically be visible to the kernel and
the kernel could then be built as usual. Therefore a patch for the Xenomai
tree would be nice but as a first step don't hesitate to just send you
current version.

Thanks,

Wolfgang.

Re: [Xenomai] Bosch CCAN/DCAN driver for RTDM

[dietmar.schindler]

> Von: Alfred Koegel
> Gesendet: Dienstag, 10. Februar 2015 15:39
> ...
> I intended to do a port a few months ago, because i started a project with a
> Atom™ E640 cpu...

Of course, Atom alone isn't a trademark - only Intel® Atom™ is.
--
Regards,
Dietmar Schindler
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Re: [Xenomai] Bosch CCAN/DCAN driver for RTDM

[Wolfgang Grandegger]

Hi Steve,

I re-added the Xenomai ML...

On 02/11/2015 04:22 PM, Steve B wrote:
> Thanks!
> One more thing, it seems to only work if the regular CAN driver was loaded
> once and then taken away with rmmod.
> I think I saw on the mailing list somebody else had experienced the same
> with the flexcan or another driver... I wonder if we can find the solution
> to that as well!

There are various options:

- use rmmod to unload the old driver (as you already did)
- use "unbind" to disconnect the Linux driver and "bind" to connect
  the RT-variant
- do not build the Linux driver at all
- use /etc/modprobe.d/blacklist

Wolfgang.