[Discuss-gnuradio] Error while running std examples max_power.py, bert : boost::math::round<d>(d): Value -nan

[Shalabh Jain]

Hello,

I recently installed the latest git pull of both the GNU Radio and UHD driver. I am getting the some relating to USRP initialization errors when I'm running some of the examples provided. max_power.py and digital_bert_tx.py or rx.py. 

My setup seems correct since I can run the fft scripts etc.

It seems to be some kind of overflow that is causing this but I am not able to figure out why. I tried to use my limited debugging skills and have these comments

1. Since bert is similar to the benchmark_tx, on comparing the two, I see that in digital_bert_tx, the error goes away if you comment out 

self._modulator = self._modulator_class(**mod_kwargs)

and pass 

self._modulator_class(**mod_kwargs)._constellation 

to the bert transmitter chain initialization. 

2. There is a minor mismatch in the arguments to the uhd_transmitter initialization, a subdevice is expected between options.tx_gain and options.antenna. 

But that is certainly not causing the error.

3. Looking at the C++ source code, the line of code that is actually throwing the exception is in the UHD tree (Line 152 in the uhd_src/host/lib/device.cpp)

device::sptr dev = maker(dev_addr);

4. I cannot figure out any temporary fix for the max_power.py failure.

Has anybody else faced similar issues before or have any suggestions for debugging directions?

Thanks

Shalabh

Traceback (most recent call last): - From bert

  File "./digital_bert_tx.py", line 130, in <module>

    tb = tx_psk_block(mod, options)

  File "./digital_bert_tx.py", line 73, in __init__

    options.antenna, options.verbose)

  File "/home/gnuradio/Shared/sj/usrp_stuff/code/s_eg/digital/narrowband/uhd_interface.py", line 137, in __init__

    freq, gain, spec, antenna)

  File "/home/gnuradio/Shared/sj/usrp_stuff/code/s_eg/digital/narrowband/uhd_interface.py", line 49, in __init__

    self.u = uhd.usrp_sink(device_addr=args, stream_args=uhd.stream_args('fc32'))

  File "/opt/gnuradio-3.5/lib/python2.6/dist-packages/gnuradio/uhd/__init__.py", line 112, in constructor_interceptor

    return old_constructor(*args)

  File "/opt/gnuradio-3.5/lib/python2.6/dist-packages/gnuradio/uhd/uhd_swig.py", line 2320, in usrp_sink

    return _uhd_swig.usrp_sink(*args)

RuntimeError: Error in function boost::math::round<d>(d): Value -nan can not be represented in the target integer type.

Traceback (most recent call last): - From max_power.py

  File "./max_power.py", line 140, in <module>

    main ()

  File "./max_power.py", line 133, in main

    tb = build_block (options.args, options.tx_enable, options.rx_enable)

  File "./max_power.py", line 63, in __init__

    self.u_tx = uhd.usrp_sink(device_addr=args, stream_args=stream_args)

  File "/opt/gnuradio-3.5/lib/python2.6/dist-packages/gnuradio/uhd/__init__.py", line 112, in constructor_interceptor

    return old_constructor(*args)

  File "/opt/gnuradio-3.5/lib/python2.6/dist-packages/gnuradio/uhd/uhd_swig.py", line 2320, in usrp_sink

    return _uhd_swig.usrp_sink(*args)

RuntimeError: Error in function boost::math::round<d>(d): Value -nan can not be represented in the target integer type.