GMSK Demodulator -- Assertion 'imu>=0" failed

GNU Radio
1

Hi ,

I was running a GMSK demodulator to demodulate a file source signal, and
I have come up with the following error. I think there is a data type
problem associated. Does anybody have similar problem ? I check the
previous posts but there is no answer on that.

Here is the code :
fasika@fasikachess:~$python demod_file.py

gr_fir_fff: using SSE
python: gri_mmse_fir_interpolator.cc:66: float
gri_mmse_fir_interpolator::interpolate(const float*, float) const:
Assertion `imu >= 0’ failed.
Aborted (core dumped)

Fasika

2

On Mon, Feb 04, 2008 at 02:27:09AM -0800, Fasika A. wrote:

Hi ,

I was running a GMSK demodulator to demodulate a file source signal,
and I have come up with the following error. I think there is a data
type problem associated. Does anybody have similar problem ? I check
the previous posts but there is no answer on that.

Which GMSK demodulator?
gnuadio-core/src/python/gnuradio/blks2impl/gmsk.py?
Which version of GNU Radio?

Here is the code :
fasika@fasikachess:~$python demod_file.py

gr_fir_fff: using SSE
python: gri_mmse_fir_interpolator.cc:66: float gri_mmse_fir_interpolator::interpolate(const float*, float) const: Assertion `imu >= 0’ failed.
Aborted (core dumped)

Fasika

Eric

3

I am using GNU radio 3.1.1 but I have been using the block blks2. Now I
am using blks2impl and the error is gone. But I am now facing a new
problem.

“/usr/local/lib/python2.5/site-packages/gnuradio/gr/basic_flow_graph.py”,
line 84, in coerce_endpoint
raise ValueError, “Not coercible to endpoint: %s” % (x,)
ValueError: Not coercible to endpoint:
<gnuradio.blks2impl.gmsk.gmsk_demod object at 0xb649deac>

Here is the code:

from gnuradio import gr
from gnuradio.blks2impl import gmsk
from optparse import OptionParser
from gnuradio.eng_option import eng_option
import struct

class graph(gr.flow_graph):

def __init__(self):
    gr.flow_graph.__init__(self)

    filename = '/home/fasika/Desktop/Binary'
    outputfilename = "demod"

    self.src = gr.file_source(gr.sizeof_gr_complex, filename)
    demod = gmsk.gmsk_demod()
    self.dst = gr.file_sink(gr.sizeof_char, outputfilename)
    self.connect(self.src, demod, self.dst)

if name == ‘main’:
try:
graph().run()
except KeyboardInterrupt:
pass

Fasika

Eric B. [email protected] wrote: On Mon, Feb 04, 2008 at 02:27:09AM
-0800, Fasika A. wrote:

Hi ,

I was running a GMSK demodulator to demodulate a file source signal,
and I have come up with the following error. I think there is a data
type problem associated. Does anybody have similar problem ? I check
the previous posts but there is no answer on that.

Which GMSK demodulator?
gnuadio-core/src/python/gnuradio/blks2impl/gmsk.py?
Which version of GNU Radio?

Here is the code :
fasika@fasikachess:~$python demod_file.py

gr_fir_fff: using SSE
python: gri_mmse_fir_interpolator.cc:66: float gri_mmse_fir_interpolator::interpolate(const float*, float) const: Assertion `imu >= 0’ failed.
Aborted (core dumped)

Fasika

Eric

4

On Tue, Feb 05, 2008 at 12:21:37AM -0800, Fasika A. wrote:

I am using GNU radio 3.1.1 but I have been using the block blks2. Now I am using blks2impl and the error is gone. But I am now facing a new problem.

“/usr/local/lib/python2.5/site-packages/gnuradio/gr/basic_flow_graph.py”, line 84, in coerce_endpoint
raise ValueError, “Not coercible to endpoint: %s” % (x,)
ValueError: Not coercible to endpoint: <gnuradio.blks2impl.gmsk.gmsk_demod object at 0xb649deac>

You can’t mix flow_graph and blk2. You should be subclassing
gr.top_block, not gr.flow_graph

def __init__(self):

if name == ‘main’:
try:
graph().run()
except KeyboardInterrupt:
pass

Eric

5

Thanks , Now its working fine.

Fasika

Eric B. [email protected] wrote: On Tue, Feb 05, 2008 at 12:21:37AM
-0800, Fasika A. wrote:

I am using GNU radio 3.1.1 but I have been using the block blks2. Now I am using blks2impl and the error is gone. But I am now facing a new problem.

“/usr/local/lib/python2.5/site-packages/gnuradio/gr/basic_flow_graph.py”, line 84, in coerce_endpoint
raise ValueError, “Not coercible to endpoint: %s” % (x,)
ValueError: Not coercible to endpoint:

You can’t mix flow_graph and blk2. You should be subclassing
gr.top_block, not gr.flow_graph

def __init__(self):

if name == ‘main’:
try:
graph().run()
except KeyboardInterrupt:
pass

Eric