[USRP-users] GRC Radio Block Receives no Data

Zhihong Luo zhluo at umich.edu
Fri Mar 18 18:31:25 EDT 2016


Hi all,

We found that it will run into overrun error after the first try: (The
first try after power cycle will not have overrun, but the received signal
is not right (file sink)).

Doverrun on chan 0
Doverrun on chan 0
-- radio_ctrl::handle_overrun()
Ooverrun on chan 0

The sample rate is still very slow (5M). Besides, it worked if we used
Radio on Tx.

I just get into RFNoC, and I never encountered this problem using the
usrp-source. I am really confused about this, thanks in advance for any
help.

Thanks,
Zhihong

On Fri, Mar 18, 2016 at 5:17 PM, Zhihong Luo <zhluo at umich.edu> wrote:

> Hi all,
>
> I am new to RFNoC and I tried to run a simple GRC using a RFNoC Radio and
> scope sink. But there seems to be no outputs.
>
> I assume Radio works exactly as USRP Source, so I am really confused. The
> GRC' output is attached (didn't output errors). What am I missing?
>
> Using Volk machine: sse4_2_64_orc
> -- [0/Radio_0] _resolve_port_def()
> -- [0/Radio_0]   item type: sc16
> -- [0/Radio_0]   vector length: 0
> -- [0/Radio_0]   packet size: 0
> -- [0/Radio_0] _resolve_port_def()
> -- [0/Radio_0]   item type: sc16
> -- [0/Radio_0]   vector length: 0
> -- [0/Radio_0]   packet size: 0
> DEBUG: output item size: 8
>
> DEBUG: check_topology()
> DEBUG: RFNoC blocks with streaming ports: 1
> DEBUG: start(): ninputs == 0 noutputs == 1
> DEBUG: creating rx streamer with: block_id=0/Radio_0
> -- [0/Radio_0] _resolve_port_def()
> -- [0/Radio_0]   item type: sc16
> -- [0/Radio_0]   vector length: 0
> -- [0/Radio_0]   packet size: 0
> -- [RX Streamer] creating rx stream recv_buff_size=33554432
> -- [RX Streamer] data_sid = 00:08>02:30 actual recv_buff_size = 33554432
> -- [0/Radio_0] radio_ctrl::set_destination()
> --   Setting sid to 2.48>0.8
> -- [RX Streamer] spp == 364
> -- [RX Streamer] Flow Control Window = 20515, Flow Control Handler Window
> = 641
> -- [0/Radio_0] radio_ctrl::configure_flow_control_out()20515
> -- [RX Terminator 0] rx_stream_terminator::set_rx_streamer() 1
> -- [0/Radio_0] radio_ctrl::set_rx_streamer() 1
> -- [Device3] updating RX streamer to RX Terminator 0
> --   New tick_rate == 2e+08  New samp_rate == 8e+06 New scaling ==
> 3.05187e-05
> -- [0/Radio_0] radio_ctrl::issue_stream_cmd()
> -- [0/Radio_0] radio_ctrl::issue_stream_cmd()
> -- [RX Terminator 0] rx_stream_terminator::~rx_stream_terminator()
> -- [RX Terminator 0] rx_stream_terminator::set_rx_streamer() 0
> -- [0/Radio_0] radio_ctrl::set_rx_streamer() 0
>
>
> Thanks,
> Zhihong
>
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