Re: [Discuss-gnuradio] How to instantiate uhd usrp sink in C++

[baobaonanpo D]

Hi,

  Josh, Thanks for your help very much!

  I use the file sink in C++ to verify the flow graph, as follows:

tb = gr_make_top_block("send");

file_sink = gr_make_file_sink(sizeof(gr_complex), filenamein.c_str());

tb->connect(amp,0, file_sink,0);

it run fine. but if I use the usrp sink, as follows:

double freq= 2450e6;   

int gain = 35; 

   boost::shared_ptr<uhd_usrp_sink> usrp_sink = uhd_make_usrp_sink(device_addr,uhd::stream_args_t("fc32"));  

 usrp_sink->set_center_freq(freq);  

 usrp_sink->set_gain(gain);

tb->connect(amp,0, usrp_sink,0);

Its error information is:

Uterminate called after throwing an instance of 

'boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::math::rounding_error> >'

  what():  Error in function boost::math::round<d>(d): Value inf can not be represented in the target integer type.

已放弃 (core dumped)

I google it and someone said The value"inf" is usually due to a divide-by-zero error somewhere in the chain.

from the URL:http://www.ruby-forum.com/topic/2315011

But I do not know how to correct it, so, Thanks very much for your help!

Best Regard!  

2012/5/11 Josh Blum <address@hidden>

You may want to see the c++ examples here to see how to instantiate:
http://gnuradio.org/cgit/gnuradio.git/tree/gr-uhd/examples/c++/

-josh

>>> how to
>>> gr_uhd_usrp_sink_sptr usrp_sink = uhd_make_usrp_sink(addr,type,1);
>>> ...
>>> ...
>
>>> Well thats the problem, there is no enum w/ value 2. Use one of the
>> build-in enums: >
> http://www.ettus.com/uhd_docs/doxygen/html/classuhd_1_1io__type__t.html >
>> Also, you can pass uhd::io_type_t::COMPLEX_FLOAT32 directly as the >second
> argument. > >-josh
>
> Hi,
>   josh, I am also want to instantiate uhd usrp sink in C++, I google it and