[etherlab-users] etherlab dc sync check

[Jun Yuan]

After talking with Martin, I realized his improvement has been done to
the default trunk of the repository since 2011, yet still not in the
stable-1.5 branch, which I'm using. I wonder why this has not been
merged into stable-1.5 branch in such a long time. Using cycles would
indeed improve the calculation, as Martin did, yet I still prefer to
do it straightly by comparing the system time of the slave and the
app_time when the read datagram is sent.

On Mon, Jan 6, 2014 at 3:15 PM, Jun Yuan <j.yuan at rtleaders.com> wrote:
> Hi Martin,
>
> I see, that's a long time ago. You've got to know Etherlaber ealier
> than I did. Things have changed since then. EC_HAVE_CYCLES would have
> no effect to the DC sync in the current etherlab master v1.5.2.
>
> I read you log file, find the "corrected with 3995858" very intesting,
> since I have 0 or 400000 ususally. This must be due to EC_HAVE_CYCLES
> you mentioned. Maybe you've improved that, but your changes are
> missing in the current etherlab master, as EC_HAVE_CYCLES is not used
> in the function ec_fsm_master_state_dc_read_offset() of the current
> master fsm_master.c.
>
> My vacation ends today, I'm not sure if I will still have time to
> investigate further when I get back to work, but I would like to know
> what changes you've made. Send me a copy when your souce is published.
>
> On Mon, Jan 6, 2014 at 1:14 PM, Martin Troxler
> <martin.troxler at komaxgroup.com> wrote:
>> Hi Jun,
>>
>>
>> On 06.01.2014 11:46, Jun Yuan wrote:
>>
>> Did you borrow that idea of EC_HAVE_CYCLES from me?
>> http://lists.etherlab.org/pipermail/etherlab-users/2011/001522.html
>>
>> I improved that in May 2010, see commit f452c93f7723 in the mercurial
>> repository.
>>
>>
>> :D sorry I was kidding. Which version of Etherlab are you using? Which linux
>> kernel? The value of HZ in your linux kernel? Maybe you can set the
>> etherlab's debug level to 1 and send us the log file. It's quite helpful to
>> have it.
>>
>> We use a heavily patched master, the last merge with Florian Pose's repo was
>> in May 2011 (commit 9cc8f64726bb). I tried several times to convince him to
>> merge our changes back into his master branch, but he refused because of
>> some changes he didn't like. We are now thinking about ways to publish our
>> source (because it's still GPL'd code). I can send you a mercurial bundle
>> with our changes if you like.
>> Our kernels are 3.6.11.9-realtime-1-rt42 or 3.10.18-realtime-1-rt14 with a
>> Hz value of 1000 (But this doesn't affect the DC calculation due to the use
>> of EC_HAVE_CYCLES)
>>
>> Regards
>> Martin
>>
>> --
>> Martin Troxler
>> Dipl. Informatik-Ing. HTL
>> Senior Software Engineer R&D
>> Department E1
>>
>> Komax AG
>> Industriestrasse 6
>> CH - 6036 Dierikon
>>
>> Phone ++41 41 455 07 65
>> Fax ++41 41 450 1579
>> martin.troxler at komaxgroup.com
>> www.komaxgroup.com
>>
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>>
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>
>
>
> --
> Jun Yuan
> [Aussprache: Djün Üän]
>
> Robotics Technology Leaders GmbH
> Am Loferfeld 58, D-81249 München
> Tel: +49 89 189 0465 24
> Mobile: +49 176 2176 5238
> Fax: +49 89 189 0465 11
> mailto: j.yuan at rtleaders.com
>
> Umlautregel in der chinesischen Lautschrift Pinyin: Nach den Anlauten
> y, j, q, und x wird u als ü ausgesprochen, z.B. yu => ü,  ju => dschü,
>  qu => tschü,  xu => schü.



-- 
Jun Yuan
[Aussprache: Djün Üän]

Robotics Technology Leaders GmbH
Am Loferfeld 58, D-81249 München
Tel: +49 89 189 0465 24
Mobile: +49 176 2176 5238
Fax: +49 89 189 0465 11
mailto: j.yuan at rtleaders.com

Umlautregel in der chinesischen Lautschrift Pinyin: Nach den Anlauten
y, j, q, und x wird u als ü ausgesprochen, z.B. yu => ü,  ju => dschü,
 qu => tschü,  xu => schü.