[Discuss-gnuradio] Error : usb_claim_interface: failed interface 1

[kaleem ahmad]

Hi everyone,

I am using USRP, with RFX2400 daughter, and Linux system.

I am trying to implement an echo back system where one Transceiver (say
Master) will transmit a frame to other transceiver (say Slave). The Salve
returns the frame immediatelly without any processing to Master.

On Master side following is the flow control:
 
                tx = send()
                tx.run()
                tx.stop()

                rx = receive(options.payload_size, options.data_rate,
options.gain,options.no_gui)
                rx.start()
                while (rx.is_running and flag)
                        if (data is received):
                                flag = 0
                                rx.stop()

On Slave side following is the flow control:
                
                rx = receive(options.payload_size, options.data_rate,
options.gain,options.no_gui)
                rx.start()
                while (rx.is_running and flag)
                        if (data is received):
                                flag = 0
                                rx.stop()
                
                tx = send()
                tx.run()
                tx.stop()

 The problem which I am facing is the following error on Master side after
one complete cycle (i.e. Master transmit, and then start receiving, and
after receing when it try to go back to transmit mode this error is
generated)               


"usrp_open_interface:usb_claim_interface: failed interface 1
could not claim interface 1: Device or resource busy
usrp_basic_tx: can't open tx interface
Traceback (most recent call last):
  File "./tx_Master.py", line 336, in <module>
    main ()
  File "./tx_Master.py", line 295, in main
    tx = send(options.payload_size, data, options.data_rate, options.gain)
  File "./tx_Master.py", line 125, in send
    u = usrp.sink_c (0, usrp_interp)
  File "/usr/local/lib/python2.5/site-packages/gnuradio/usrp.py", line 212,
in __init__
    fpga_filename, firmware_filename)
  File "/usr/local/lib/python2.5/site-packages/gnuradio/usrp1.py", line 710,
in sink_c
    return _usrp1.sink_c(*args)
RuntimeError: can't open usrp1"

On receive side after one complete cycle (Receive then Transmit then
Receive->Error) error is received for receive interface i.e "can't open tx
interface", remaining description of error is same.

Can some one help me to solve this error.
If some one wants to have a look at code then complete code is attached.

Thanks
Kaleem Ahmad http://www.nabble.com/file/p19491587/tx_Master.py tx_Master.py 
http://www.nabble.com/file/p19491587/rx_Slave.py rx_Slave.py 
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