Re: [Discuss-gnuradio] set_auto_tr(), gr_stall, and PTT

[Eric Blossom]

On Mon, Sep 10, 2007 at 03:19:53PM -0400, Michael Dickens wrote:
> This email is to verify 2 items:
> 
> A) As per emails (1) and (2) below, in order to use the set_auto_tr()  
> feature on RFX boards, I need to stall the TX path somehow since - 
> any- input on the TX path will result in no RX (even all 0's).
> 
> B) After searching through gnuradio-core/src/lib, I find no  
> "gr_stall" or similar.  Does this block exist anywhere, and if not,  
> is there a simple way around it or should I just write the block  
> (it's not difficult, but why reinvent the wheel)?  Or does someone  
> have an implementation that I can leverage?

There's no gr_stall.  Currently auto_tr mode is used with the packet
data examples.  See gnuradio-examples/python/digital.  There is no
explicit "stall", the transmitter pipeline stalls when no packets are
being fed into the PHY via the message source.

> The "set_auto_tr()" method sounds from my reading to be a great way  
> to go, but the examples I've found in gnuradio-examples instead use  
> "subdev.set_enable()" instead ... which from reading through the GNU  
> Radio email archives is quite a bit slower than the former.  Thus my  
> wondering if anyone is using the former, and if so, how?

Eric