RE: [Discuss-gnuradio] help: cannot send after transport endpoint shutdown

[Joreen Tan]

If i want the usrp to act as both of a transmitter and a receiver at one station, meaning i want the usrp to be able to transmit and receive at the same time, which file should i activate instead?
 
 
I don't understand the following statement "Auto T/R" (Automatic Transmit/Receiver switching) handles it for you. With Auto T/R enabled, the receiver runs unless there are samples in the Transmit FIFO. This is handled in the FGPA", could you provide some sample code or example to illustrate how to achieve this?

Regards,
Joreen




> Date: Wed, 28 Jan 2009 10:36:05 -0800
> From: address@hidden
> To: address@hidden
> CC: address@hidden
> Subject: Re: [Discuss-gnuradio] help: cannot send after transport endpoint shutdown
>
> On Wed, Jan 28, 2009 at 04:43:36PM +0800, Joreen Tan wrote:
> >
> > I'm trying it on the benchmark_tx and benchmark_rx scripts as i need
> > to make it at least a half duplex communication between the two
> > devices, i need to free up the resources if not i will get error
> > message that states that the resource is busy.
>
> It'll run half duplex automatically if you enable "auto_tr" mode...
>
> ...And benchmark_{rx,tx} are already set to do that.
> See line 73 in receive_path.py and line 99 in transmit_path.py (line
> numbers are from the trunk.)
>
> > Another question that i observed is that, there seems to be no way to
> > stop the receiver once it is activated unlike the transmitter.
>
> "Auto T/R" (Automatic Transmit/Receiver switching) handles it for you.
> With Auto T/R enabled, the receiver runs unless there are samples in
> the Transmit FIFO. This is handled in the FGPA.
>
> See the USRP FAQ and look at the inline docs in usrp_standard.h and
> usrp_basic.h. These two files implement the fundamental interface to
> the USRP. Almost all of that interface is available in Python.
>
> http://gnuradio.org/trac/wiki/UsrpFAQ
>
> Eric

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