Re: [Discuss-gnuradio] Can not get rx time tags

[Josh Blum]

On 09/03/2013 12:41 AM, Harry Zhang wrote:
> Hi,
> I'm trying to get rx time tags in narrowband Benchmark_tx/rx with a
> modified digital_correlate_access_code.cc. But the
> "get_tags_in_range(rx_time_tags,0,this->nitems_read(0)+i,this->nitems_read(0)+i+1,pmt::pmt_string_to_symbol("rx_time"))"
> 
> method gets no tag in rx_time_tags while the communication between two
> USRP N210s running benchmark_rx/tx is OK.
> I'm using GNU Radio 3.6.5.1, Ubuntu12.04, boost 1.48 and UHD 3.5.3.
> Thanks in advance.
> 

The time tag is sent once at the beginning of streaming and after
overflows. Its not necessary to send more time tags because the absolute
sample count and sample rate can be used to interpolate the time to any
sample.

So I think are you seeing a time tag, just only once at init time. When
the block sees the time, try to save the timestamp and the count it was
found at.

I hope that helps!
-josh

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