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From: | Mattia Rizzi |
Subject: | Re: [Discuss-gnuradio] Packet-based communication & underrun / Possible solution? |
Date: | Wed, 26 Oct 2011 15:32:59 +0200 |
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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