[Xenomai-help] kernel module misses rt_get_time

[Xenomai-help] kernel module misses rt_get_time

[Gerald Dachs]

Hi,

I am new to xenomai, sorry if I ask something stupid. 
I try to use a kernel module with xenomai, but upon loading it
misses rt_get_time. It looks like it was build with rtai. I have thought
I could use it with xenomai via the rtai skin.
In the rtai skin I found only rt_get_time_ns.
Searching the web I found them both mentioned, I didn't found
that it is replaced by another function. Is xnpod_get_time the
same?

Gerald

Re: [Xenomai-help] kernel module misses rt_get_time

[Gilles Chanteperdrix]

Gerald Dachs wrote:
 > Hi,
 > 
 > I am new to xenomai, sorry if I ask something stupid. 
 > I try to use a kernel module with xenomai, but upon loading it
 > misses rt_get_time. It looks like it was build with rtai. I have thought
 > I could use it with xenomai via the rtai skin.
 > In the rtai skin I found only rt_get_time_ns.
 > Searching the web I found them both mentioned, I didn't found
 > that it is replaced by another function. Is xnpod_get_time the
 > same?

Looking at branch 2.0 RTAI skin, the rt_get_time function appears to be
missing. Looking at branch 2.1 RTAI skin, the future trunk, well, there
is nothing but the init.c file. 

So, using xnpod_get_time appears to be the safe bet.

-- 


					    Gilles Chanteperdrix.

Re: [Xenomai-help] kernel module misses rt_get_time

[Philippe Gerum]

Gilles Chanteperdrix wrote:
> Gerald Dachs wrote:
>  > Hi,
>  > 
>  > I am new to xenomai, sorry if I ask something stupid. 
>  > I try to use a kernel module with xenomai, but upon loading it
>  > misses rt_get_time. It looks like it was build with rtai. I have thought
>  > I could use it with xenomai via the rtai skin.
>  > In the rtai skin I found only rt_get_time_ns.
>  > Searching the web I found them both mentioned, I didn't found
>  > that it is replaced by another function. Is xnpod_get_time the
>  > same?
> 
> Looking at branch 2.0 RTAI skin, the rt_get_time function appears to be
> missing. Looking at branch 2.1 RTAI skin, the future trunk, well, there
> is nothing but the init.c file. 

There is no user-space support for the RTAI skin currently.

> 
> So, using xnpod_get_time appears to be the safe bet.
> 


-- 

Philippe.

Re: [Xenomai-help] kernel module misses rt_get_time

[Jan Kiszka]

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Gerald Dachs wrote:
> Hi,
> 
> I am new to xenomai, sorry if I ask something stupid. 
> I try to use a kernel module with xenomai, but upon loading it
> misses rt_get_time. It looks like it was build with rtai. I have thought
> I could use it with xenomai via the rtai skin.
> In the rtai skin I found only rt_get_time_ns.
> Searching the web I found them both mentioned, I didn't found
> that it is replaced by another function. Is xnpod_get_time the
> same?

Actually, rt_get_time and rt_get_time_ns are the same in the RTAI
compatibility skin (counts are nanoseconds here, see count2nano e.g.).
Therefore, a

static inline RTIME rt_get_time(void) {
	return rt_get_time_ns();
}

should make it into rtai/timer.h (sorry, I have nothing to generate a
patch at hand).

Jan

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Re: [Xenomai-help] kernel module misses rt_get_time

[Gerald Dachs]

> Actually, rt_get_time and rt_get_time_ns are the same in the RTAI
> compatibility skin (counts are nanoseconds here, see count2nano e.g.).
> Therefore, a

Sorry, but I don't think so. In the rtai docs I read that rt_get_time returns ticks
and rt_get_time_ns returns nano seconds.

Gerald

Re: [Xenomai-help] kernel module misses rt_get_time

[Jan Kiszka]

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Gerald Dachs wrote:
>>Actually, rt_get_time and rt_get_time_ns are the same in the RTAI
>>compatibility skin (counts are nanoseconds here, see count2nano e.g.).
>>Therefore, a
> 
> 
> Sorry, but I don't think so. In the rtai docs I read that rt_get_time returns ticks
> and rt_get_time_ns returns nano seconds.
> 

Yes, in the original RTAI. But the emulation skin of Xenomai makes no
difference in this regard - all nanoseconds. That's why the conversion
functions are void here.

Jan

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