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Re: [Discuss-gnuradio] How does the gr.enable_realtime_scheduling() affe

From: Josh Blum
Subject: Re: [Discuss-gnuradio] How does the gr.enable_realtime_scheduling() affect flow graph? How to avoid receive own data?
Date: Tue, 14 Feb 2012 16:21:18 -0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:9.0) Gecko/20111229 Thunderbird/9.0

If this helps, you can precisely time transmit packets using stream
tags. If you know the time when a transmit occurs, you can intelligently
mute your receiver. See notes in uhd_usrp_sink.h

Also, it has just occurred to me that my stream selector block does not
forward stream tags. - Mental note to myself.


On 02/13/2012 12:04 PM, Zhonghua wrote:
> Hi all,
> I applied Josh's new block "stream_selector", it is a great selector
> which allow to set dynamic path without stop flow. But I still have some
> problem with my flow graph. That is a issue relating to
> gr.enable_realtime_scheduling(). I use signal from another process to
> control the open and close of my flow based on the new stream_selector.
> If the gr.enable_realtime_scheduling() exists the receiving action looks
> very slow and the signal handler function reacts wrong sometimes. If
> cancers the gr.enable_realtime_scheduling(), all things looks very well
> but own data packages transmitted are received sometimes and then the
> desired packages can not be received at that moment.
> Who knows how the gr.enable_realtime_scheduling() affect flow graph? How
> can avoid receive own data when work in duplex mode. I have modified the
> configuration in /uhd/host/lib/usrp/dbboard/db_rfx.cc to make:
> /this->get_iface()->set_atr_reg(dboard_iface::UNIT_RX,//dboard_iface::ATR_REG_FULL_DUPLEX,
> _power_up | ANT_RX2| MIXER_DIS);/
> /But it still receives own data sometimes(not always, also dose not
> relate to gr.enable_realtime_scheduling()).
> /
> /Any suggestion is very appreciated.
> /
> /Sincerely,
> /
> /Zhonghua
> /
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