[etherlab-users] dc_user example understanding

[Peter van Knippenbergh]

Hi

 

I try to understand the synchronization mechanism in the IGH master for DC.

 

I try to understand what happens in the example/dc_user directory

 

Here is part of the code I try to understand including the questions

 

    app_time.tv_usec += 1000000 / FREQUENCY;

    if (app_time.tv_usec >= 1000000)  {

        app_time.tv_usec -= 1000000;

        app_time.tv_sec++;

    }

    ecrt_master_application_time(master, EC_TIMEVAL2NANO(app_time));

What is the result of this call for the slaves (after the ecrt_master_send
call)??

    if (sync_ref_counter) {

        sync_ref_counter--;

    } else {

        sync_ref_counter = 9;

        ecrt_master_sync_reference_clock(master);

What is the result for the slaves of this call for the slaves (after the
ecrt_master_send call) ??

    }

    ecrt_master_sync_slave_clocks(master);

Here I assume that after the ecrt_master_send all the slave clocks are
synchronized with the DC master clock and the DC master clock will not be
changed. Correct ??

    // send process data

    ecrt_domain_queue(domain1);

    ecrt_master_send(master);

 

Kind regards

 

Peter

 

Peter van Knippenbergh

Test and Software designer

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