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

[Gong Zhang]

Dear Josh,
  Thanks for your reply.
  I move the code "get_tags_in_range" in
digital_correlate_access_code, so it will be executed when
digital_correlate_access_code runs.
  I start the sender first and then the receiver. But I still get no tag.
  Does "the beginning of stream" mean the point just the receive program runs?

2013/9/5 Josh Blum <address@hidden>:
>
>
> 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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