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I'm using symbol sync block (symbol_sync_ff) on my project and i use many different sps values that i need reset on runtime.

I'm trying to reset sending clock_est tag. Is this the right way to reset the sps value?

key = pmt.intern("clock_est")
value = pmt.to_pmt((0.0, 45.0))
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2 Answers 2

Reset to default
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From gr-digital/lib/symbol_sync_ff_impl.cc:

// got a clock_est tag
timing_offset = static_cast<float>(
                   pmt::to_double(pmt::tuple_ref(t->value, 0)));
clock_period = static_cast<float>(
                   pmt::to_double(pmt::tuple_ref(t->value, 1)));

So, if you want to set the timing offset to 0 and the clock period to 45, then, yep, that's the correct code.

Because I think there will be future visitors to this question: Generally, the documentation can be found under https://www.gnuradio.org/doc/doxygen/classgr_1_1digital_1_1symbol__sync__ff.html

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  • $\begingroup$ I'm really not sure what you're telling me. $\endgroup$
    – Marcus Müller
    Commented Nov 14, 2018 at 8:31
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I found the solution to my problem: increase the max deviation value parameter in the block, because the sps range that the block allows is the nominal value +- the user specified allowed deviation.

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