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
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