Jan Kiszka wrote:
  

Karl Reichert wrote:
    

Hello,

I have two stations running RTnet, one as a master and one as a slave. I
      

want 
    

to measure the time, which a message, sent from master to slave, takes.
      

But, 
    

I don't want the time of the transmission only, but the complete time of
      

all 
    

software layers this data is processed through.

_______________	_______________
|		A		  |	|		D		  |
|______________|	|______________|
|		B		  |	|		C		  |
|______________|	|______________|
|   RTnet (Master)	  |	|    RTnet (Slave)	  |
|______________|	|______________|
		|				  |
		|______________|

So, I create the data, that should be send, in Layer A (Master) and send
      

it 
    

over RTnet to Layer D (Slave).

I want to take the time when the data leaves A and when it arrives D
      

with 
    

rtdm_clock_read(). If I have the offset between master and slave, I can 
calculate the time it took to pass A, B, both RTnet stacks, C and D.

As RTnet keeps track of the offset in it's stack, I want to use this
      

value. Is 
    

it possible via the API? I didn't found anything. Or do I have to
      

manipulate 
    

the stack to pass the offset to the higher layers (C and D)?
      

If RTmac/TDMA is in use, you can obtain the clock offset via
RTMAC_RTIOC_TIMEOFFSET from the RTDM device "TDMA<x>" (where "<x>"
corresponds to "rteth<x>").

Jan

    

When I try to compile my application (xenomai native skin, user task), I get an error, saying rtdm_driver.h (which contains the prototype for rtdm_clock_read()) is for kernel mode tasks only.

How can I get a timestamp in a xenomai native user task? Is there sth equivalent to rtdm_clock_read()? Or do I have to write a kernel task?

Thanks
Karl