This is normal for the first few cycles; it takes several cycles for the reference clock to “sync in”. It should eventually start working.
This is why there’s a patch in the unofficial patchset to suppress the fprintf error when using the usermode library. From: Mohsen Alizadeh Noghani Sent: Friday, 26 October 2018 19:16 To: [email protected] Subject: [etherlab-users] Failed to get reference clock time: Input/output error Hello everyone. When I call ecrt_master_reference_clock_time -right after ecrt_master_sync_slave_clocks()- in my userspace code, I get the following error every cycle. Failed to get reference clock time: Input/output error. I'm using stable-1.5 branch. Has anyone been able to resolve this issue? Best, Mohsen
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