[USRP-users] ֻC API questions

Sivan Toledo stoledo at tau.ac.il
Sun Jul 16 03:54:08 EDT 2017


OK, tried it and I clearly need to call the "make" functions, otherwise the
code segfaults.

On Sat, Jul 15, 2017 at 7:02 PM, Sivan Toledo <stoledo at tau.ac.il> wrote:

> 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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