Re: [Discuss-gnuradio] Dynamically changing parameters of a block

[Eric Blossom]

On Tue, Sep 30, 2008 at 02:09:47AM -0700, kaleem ahmad wrote:
> 
> Any suggestions!!!!!!!!!!!!!!!

How many usrps are involved in this?
How many usrp sinks and sources are you creating?
You should be creating 1 each for each USRP and keep them open the
entire time. 

Eric


> kaleem ahmad wrote:
> > 
> > Hi Eric and others,
> > 
> > I also have a similar problem, but it is not limited to 'gain control',
> > Actually I want to implement an echo back or ping pong transmission
> > system.
> > 
> > First I implemented two separate transmitt and receive flow graphs in two
> > separate transmit(), and receive() functions as mentioned in the
> > following:
> > 
> > Master Transceiver:
> > 
> >       Transmit()            Transmitt one data packet
> >       Receive()             Wait in receive for the echoed back packet or
> > timeout
> > 
> > Slave Transceiver:
> > 
> >       if (Receive()):             Always wait in receive
> >              Transmit()            Transmitt back the received data packet
> > 
> > But in this method I get an error 'cant open usb device....cant open USRP
> > 0/1'
> > 
> > Then I found flowgraph.disconnect() method and thought that I should
> > implement a single flowgraph which can dynamically connect different
> > blocks to transmit and then disconnect and connect with receive blocks and
> > so on...
> > 
> > Is it possible and is there any example code which doing something like
> > this or otherwise can you please suggest me some way to do this.
> > 
> > Thanks
> >