[USRP-users] ֻC API questions

Sivan Toledo stoledo at tau.ac.il
Sat Jul 15 12:02:12 EDT 2017


Like question 1:

Do I need to "make" the uhd_meta_range_handle or will the call
to uhd_usrp_get_rx_gain_range make it?

If I need to make it, I assume that I also need to free it.
If I don't need to make it, do I still need to free it?

On Sat, Jul 15, 2017 at 1:46 PM, Sivan Toledo <stoledo at tau.ac.il> wrote:

> I'm converting a CPP code from UHD 3.8.5 to the C api for 3.10. (The main
> reason for the conversion is that I binaries of my CPP programs don't run
> on both Ubuntu 14 and 16 because of incompatible libboost; hopefully using
> the C API and the Ubuntu uhd-host package will resolve this).
>
> I have a few questions:
>
> 1. Is the following correct, or do I have to "make" the
> string_vector_handle before I pass it to get_rx_gain_names? The manual says
> to always make, but my intuition is that get_rx_gain_names will make it for
> me, given that it gets a pointer to the handle, not the handle itself.
>
>   uhd_string_vector_handle gain_names;
>   uhd_usrp_get_rx_gain_names(usrp, 0 /* channel */, &gain_names);
>
> 2. Is there a C api version of set_rx_gain
> <https://files.ettus.com/manual/classuhd_1_1usrp_1_1multi__usrp.html#a8234968ad1fefef299ef9541cc193915> (double
> gain, size_t chan=0)? In the header files I found only set_rx_gain but
> with a gain_name argument. The CPP api has two overloaded methods, one with
> a gain-name argument and the other without it. Is the convenience method
> missing from the C API? Can I invoke it by passing NULL for the gain name?
>
> Thanks, Sivan Toledo
>
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