Re: [Discuss-gnuradio] MIMO source - bursts

[Zohair]

Hi Josh,

I have tried the code above and used a printing block with the following
work function and vec_len=1 to see the output of one of the MIMO source
output ports:

int library_print_c::work (int noutput_items, gr_vector_const_void_star
&input_items,gr_vector_void_star &output_items){
        const gr_complex *in= (const gr_complex *) input_items[0];
        gr_complex temp_in[vec_len];

        for (int i = 0; i <noutput_items; i++){
                memcpy(&temp_in[0],in,vec_len*sizeof(gr_complex));
                for (int k=0; k<vec_len; k++)   
std::cout<<temp_in[k]<<std::endl;
        }

        return noutput_items;
}

However, if the  size variable is 1000 the output printed is a value
repeated 1000 times then a new value repeated 1000 times and so on. What I
was expecting as you know is to see 1000 differnt samples then a pause then
1000 samples and so on. I wonder if this is the real output or it's
scheduler issue between the two blocks, though the printing block is such a
conceptual copy of the howtosquare.


Regards,
Zohair


Zohair wrote:
> 
> int work( int noutput_items, gr_vector_const_void_star &input_items,
> gr_vector_void_star &output_items ){
> 
>       set_streaming(true);
>         uhd::rx_metadata_t metadata; //not passed out of this block
>       int size =   _dev->get_device()->recv(output_items, noutput_items,
> metadata, type, 
>                                                               
> uhd::device::RECV_MODE_FULL_BUFF) ;
>         return size == 0 ? -1: size ;
>     }
> 
> protected:
>     uhd::usrp::mimo_usrp::sptr _dev;
>     const uhd::io_type_t _type;
>     bool _is_streaming;
> 
>     void set_streaming(bool enb){
>         if (enb){
>             //setup a stream command that starts streaming slightly in the
> future
>             uhd::stream_cmd_t
> stream_cmd(uhd::stream_cmd_t::STREAM_MODE_NUM_SAMPS_AND_DONE);
>             stream_cmd.stream_now = false;
>           stream_cmd.num_samps=1000;
>             stream_cmd.time_spec = get_time_now() +
> uhd::time_spec_t(0.05);
> 
>             _dev->issue_stream_cmd(stream_cmd);
>         }
>         else
>            
> _dev->issue_stream_cmd(uhd::stream_cmd_t::STREAM_MODE_STOP_CONTINUOUS);
> //        _is_streaming = enb;   // REMOVED
>     }
> };
> 

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