[etherlab-users] failing dc-sync-check (and rtdm patch)

[George Broz]

Hello,

All three routines are always called from the (Xenomai) 
cyclic task. I have tried periods of 250 usec, 500 usec,
and 5 msec. 

ecrt_master_application_time() and ecrt_master_sync_slave_clocks() 
are always called at every cyclic cycle. 

I initially called ecrt_master_sync_reference_clock() every 
cycle but when that wasn't performing well, I tried skipping 
one or more cycles but that didn't seem to make a difference. 
Performance is better when using smaller periods.

In Xenomai, I call rt_timer_read() which should return 
nanoseconds since 1970. (The configuration for Xenomai has 
CONFIG_XENO_OPT_TIMING_PERIODIC=n aka "tickless mode"). This 
is supplied to _application_time(). master_sync_reference() 
is called immediately after, and ecrt_domain_queue()
and ecrt_master_send() very soon after that.

Currently, I stop calling master_sync_reference_clock() 
shortly after the slave configuration state machine has 
put all of the slaves into their OP states. I continue 
to call ecrt_master_sync_slave_clocks() for the life of 
the app.


Best regards,

--George Broz
Moog, Inc. Industrial Group



-----<etherlab-users-bounces at etherlab.org> wrote: -----
To: <etherlab-users at etherlab.org>
From: Florian Pose 
Sent by: 
Date: 01/30/2012 07:27AM
Subject: Re: [etherlab-users] failing dc-sync-check (and rtdm patch)

Hi,

do you call the ecrt_master_sync_reference_clock() and
ecrt_master_sync_slave_clocks() cyclically? Do you call
ecrt_master_application_time() cyclically? What kind of time dou you
pass to the latter?

-- 
Best regards,
Florian Pose
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