I want a gnu radio application that send packets (messages) in AIR when
pressing ENTER with USRP. Since i don't want any underun on USRP side, i
need a block that send zero-filled packets when there's no data to send.
I solved it with a modify of message_source block.
Instead of call delete->head() and wait for a message, i check if there's a
new message to send with empty_p(). If there isn't, then zero-fill the data
(to the USRP)
The code
//my code
if (d_msgq->empty_p())
{
memset (out, 0, noutput_items*d_itemsize);
return noutput_items;
}
// end of my code
d_msg = d_msgq->delete_head(); //blocking call
d_msg_offset = 0;
It's okay? There are other ways to do it better? Thank you.
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