Re: [Xenomai] XDDP and inter-driver API.

[Philippe Gerum <rpm@xenomai.org>]

On 07/10/2012 11:17 AM, Sunetra Sashi wrote:
>
>
> On Tue, Jul 10, 2012 at 5:10 AM, Philippe Gerum <rpm@xenomai.org
> <mailto:rpm@xenomai.org>> wrote:
>

...

>
>         I am making these calls from within the kernel, not from user space.
>         Hence I ended up using rtdm calls instead
>
>
>
>     /dev/rtp0 is a non-real-time user-space endpoint for the
>     communication, between a regular linux application and a real-time
>     component. It does not make sense to open it from kernel space.
>
>
> My intent here is to set up something similar to xddp-echo.c  (RT - Non
> RT communication) but in kernel space instead. How should I go about
> creating the Linux endpoint for XDDP in the kernel?
>

There is no direct way for that, this device/protocol is not intended 
for this purpose. This is a regular linux application to Xenomai 
real-time communication path, nothing else. Regular linux applications 
live in userland, only.

We don't recommend building applications in kernel space.

>
>
>
>
>
>                  Do I need to install any specific xenomai modules for
>         this to work?
>
>
>              Obviously, yes. Check IPC drivers in the "Drivers" sub-menu
>         of the
>              Xenomai configuration. You need to have
>              CONFIG_XENO_DRIVERS_RTIPC_XDDP enabled.
>
>
>         I already checked this in the configuration, It is enabled.
>         Should this
>         also be set to y? CONFIG_XENO_DRIVERS_RTIPC. In my configuration
>         it is
>         set to m.
>
>
>     Did you load the xeno_rtipc module then?
>
>
> It is not loaded. But I got an error when I did that.
> Xenomai: assertion failed at /.../kernel/xenomai/skins/)
> Xenomai: RTDM: missing open handler

It does not make any sense. This assertion can only trigger for a named 
device, not a protocol device. RTIPC is a protocol device.

- did you change any of the driver code?
- what command did you use to load the module, verbatim?

> insmod: error inserting 'xeno_rtipc.ko': -1 Invalid parameters
>
>
>
>         Should I see any modules loaded in
>         /proc/xenomai/rtdm/protocol___devices?
>
>
>     Yes.
>
>
>
>
>                  Thanks
>                  Shweta
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>
>
>
>              --
>              Philippe.
>
>
>
>
>
>     --
>     Philippe.
>
>
>


-- 
Philippe.