Re: [Discuss-gnuradio] uhd::tune_result_t vs. usrp2::tune_result

[Josh Blum]

> to work with the gr-uhd modules to (re)enable the use of UHD with the
> gnuradio-examples/python/digital stuff.

awesome

> I'm a bit confused with the return value of the set_center_freq of the
> uhd_single_usrp_source.
>
> What I tried was to map the values of the uhd::tune_result_t into a
> usrp_tune_result. Does this make any sense to you guys? ;-)

Its not quite a 1:1 mapping. I dont believe that any of the examples 
that use generic USRP even bother to look at the tune result. I would 
ignore this.

> Another question that arose while looking at the code concerns the
> change in the way we set the sample rate:

In UHD, you set the sample rate. However for usrp2 and usrp1 gnuradio 
drivers, you set the decimation and interpolation and the sample rate is 
implied to be codec_rate/decim.

I see two options:
1) change the options for the generic usrp to take a sample rate and 
internally (in generic_usrp.py) translate this into a 
decimation/interpolation number for non UHD case.

or 2) add a new option that specifies the codec rate that can be used to 
calculate the sample rate from decim/interp for the UHD case.


-josh

> Why do we have in the new UHD source:
>
> set_samp_rate (double rate)
>
> versus:
>
> set_decim (int decimation_factor)
>
> in the old USRP source?
>
> Thanks for your time again&  happy hacking
>
> - -Moritz
>
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