Re: [Discuss-gnuradio] Error with ctrl+z

[Eric Blossom]

On Tue, Mar 13, 2007 at 03:53:31PM -0600, Tarun Tiwari wrote:
> Hi,
> 
> I am implementing a stop-and-wait ARQ system using RFX2400 boards. Sometimes
> the transmitter suddenly stops working , and if I do ctrl+c the programs
> stops but does not work wheras if I do ctrl +z, I recieve following error
> after sometime:
> 
>            ICE default IO error handler doing an exit(), pid = 3793, errno
> = 0
> 
> And, if I try to run the program again, it stops communicating with USRP
> with following error messages:

I suspect that you may have missed the very first line of the
debugging output which probably explains why it couldn't open the
USRP.  Did you capture both stdout and stderr?

Eric



>  File "./mcl_snwARQ_tx.py", line 118, in ?
>    main()
>  File "./mcl_snwARQ_tx.py", line 100, in main
>    fg_rx = my_rx_graph(demods[options.modulation], rx_callback, options)
>  File "./mcl_snwARQ_tx.py", line 30, in __init__
>    self.rxpath = receive_path(self, demod_class, rx_callback, options)
>  File "/root/gnuradio-3.0.2/gr-mcl/receive_path.py", line 59, in __init__
>    self._setup_usrp_source()
>  File "/root/gnuradio-3.0.2/gr-mcl/receive_path.py", line 119, in
> _setup_usrp_source
>    fusb_nblocks=self._fusb_nblocks)
>  File "/usr/local/lib/python2.4/site-packages/gnuradio/usrp.py", line 248,
> in __init__
>    fpga_filename, firmware_filename)
>  File "/usr/local/lib/python2.4/site-packages/gnuradio/usrp1.py", line
> 1229, in source_c
>    return _usrp1.source_c(*args)
> RuntimeError: std::runtime_error
> 
> After that I need to unplug & plug the USB cable to start working with it.
> Ultimately I need to do ctrl+z and then unplug-plug the USB cable to start
> woking.
> 
> Can somebody help me out to resolve the problem which I am facing? I am
> using following settings for transmitter side:
> --tx-freq 2.4G --rx-freq 2.48G -r 500k -v -m gmsk --tx-amplitude 550
> --rx-gain 60
> 
> and following settings for receiver side:
> --rx-freq 2.40G --tx-freq 2.48G -r 500k -v -m gmsk --tx-amplitude 2000
> --rx-gain 75
> 
> Thanks in advance.
> 
> Regards,
> Tarun
> University of Texas - Dallas