> I've stepped up to GR 3.7.0, re-used gr_modtool to freshly re-create my OOT
> module, everything builds, tests, installs OK. GRC has my OOT blocks listed
> and I can put them on my flowgraph.
> One of my OOT blocks is a function that takes in shorts and outputs shorts (a
> 1-to-2 interpolator).
> I have a simple flowgraph created in GRC: File Source -> My block -> File
> sync .
> GRC is happy until I run the flowgraph, and I get this:
> Executing: "<....> /top_block.py"
> Traceback (most recent call last):
> File "<....> /top_block.py", line 54, in <module>
> tb = top_block()
> File "<....> /top_block.py", line 39, in __init__
> self.connect((self.my_block_s_to_s_0, 0), (self.blocks_file_sink_0, 0))
> File "/usr/local/lib/python2.7/dist-packages/gnuradio/gr/top_block.py",
> line 130, in connect
> self._connect(points[i-1], points[i])
> File "/usr/local/lib/python2.7/dist-packages/gnuradio/gr/top_block.py",
> line 141, in _connect
> self._tb.primitive_connect(src_block.to_basic_block(), src_port,
> AttributeError: 'function' object has no attribute 'to_basic_block'
An update.
First, I believe I exhaustively eradicated older installed versions of GR by
searching and deleting for anything named '*gnuradio*' under /usr, re-built GR
and re-installed. But, same results.
Using the pdb single step debugger and also just looking at the code, I have a
question about top_block.py (under
/usr/local/lib/python2.7/dist-packages/gnuradio/gr):
def _connect(self, src, dst):
(src_block, src_port) = self._coerce_endpoint(src)
(dst_block, dst_port) = self._coerce_endpoint(dst)
self._tb.primitive_connect(src_block.to_basic_block(), src_port,
dst_block.to_basic_block(), dst_port)
def _coerce_endpoint(self, endp):
if hasattr(endp, 'to_basic_block'):
return (endp, 0)
else:
if hasattr(endp, "__getitem__") and len(endp) == 2:
return endp # Assume user put (block, port)
else:
raise ValueError("unable to coerce endpoint")
I'm not a python expert, but "_coerce_endpoint" is checking if the attribute
'to_basic_block' exists... But then the "_connect" function goes right ahead
and tries to use it as it prepares to call "primitive_connect", which is what
the error is about... And single stepping through the python code seems to
verify that... (in my case, the test for __getitem__ and len(endp) == 2 is the
path the code takes).
I also don't understand why "_coerce_endpoint" in that path returns ony "endp",
but in its other leg, returns "(endp, 0)"? Seems like the caller wants to
assign 2 values (src_block, src_port)...
This part of the top_block.py code is the same between 3.6.4.2 and 3.7.0...
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