From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <482BD329.7020704@domain.hid> Date: Thu, 15 May 2008 08:07:37 +0200 From: =?ISO-8859-1?Q?St=E9phane_ANCELOT?= MIME-Version: 1.0 References: <200805112104.56166.karl-trampe@domain.hid> <48276703.2020005@domain.hid> <20080514144900.216230@domain.hid> In-Reply-To: <20080514144900.216230@domain.hid> Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Subject: Re: [Xenomai-help] [RTnet-users] Ideas how to measure delays with RTnet List-Id: Help regarding installation and common use of Xenomai List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Karl Reichert Cc: xenomai@xenomai.org, rtnet-users@domain.hid Karl Reichert a écrit :

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

Hi,
A good scopemeter can help. you have to activate com or lpt pins in your program before after receive/send funcs and watch the output status of it in scopemeter.
Best Regards
Steph