Hello everyone,
I posted this question before but never get any response so I am posting
it
again because it have become a serious problem for me and I am unable to
solve it. Because of it my entire project is delayed. I have read many
posts
which address a similar problem but most of them were in 2006-2007 and I
could not find any clue to solve my problem.
Actually I want to implement an echo back or ping pong transmission
system
(This is actually a small or starting part of a big project)
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()/disconnect_all() methods 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… as follows (my perception):
while (true):
connect(send blocks)
disconnect_all()
connect(receive blocks)
disconnect_all()
Is it possible (I mean can I do exactly as above, or how can I implement
such a cyclic graph) and is there any example code which doing something
like this or otherwise can you please suggest me some way to do this.
Please either suggest some solution to ‘cant open usb device…cant
open
USRP 0/1’, or to this cyclic-reconfigurable graph.
Thanks
Kaleem Ahmad
–
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