On 14 January 2017 06:02, quoth Jiarui Lian: > I tried to synchronize master clock to a reference-slave-EK1100 (due to > Master clock jitter): > * Based on the example of "examples/rtai_rtdm_dc". > * I modified the example, since I am using RT-Preempt instead of RTAI. > * But I got error: "Failed to get reference clock time: Input/Output error"? > --- (And I found that the error message comes from function > "ecrt_master_reference_clock_time()") > > Graeme and Tommaso have some discussions on this issue before, but not > sure if it is solved: > http://lists.etherlab.org/pipermail/etherlab-users/2016/003026.html
This error is normal when using the user-mode library -- it takes a few cycles for the master to locate and init the reference clock and the API will return EIO or ENXIO during this time. It should eventually stop doing that (if a ref clock is indeed found), but in the meantime the user mode library prints error messages to stderr. The commit https://sourceforge.net/p/etherlabmaster/code/ci/3affe9cd0b66fe55ef8e8060778 ef9461a8204a0/ (default branch) removes this logging to avoid the spam. Alternately you could implement a "spin up time" where you don't try to sync the master clock for the first few cycles (or until the slaves are all configured and the network is stable), although this might complicate your master application. _______________________________________________ etherlab-users mailing list etherlab-users@etherlab.org http://lists.etherlab.org/mailman/listinfo/etherlab-users