Hello,
I have followed the exact same steps as shown in this video:
https://www.youtube.com/watch?v=M9ntwQie9vs to create a custom RFNoC Gain
block. I successfully built the FPGA bitstream and booted the E310 device
with it.
After flashing, I confirmed that the RFNoC blocks were correctly loaded.
The output is:
RFNoC blocks on this device:
* 0/Gain#0
* 0/Radio#0
Static connections on this device:
* 0/SEP#0:0 ==> 0/Radio#0:0
* 0/Radio#0:0 ==> 0/SEP#0:0
* 0/SEP#1:0 ==> 0/Radio#0:1
* 0/Radio#0:1 ==> 0/SEP#1:0
* 0/SEP#2:0 ==> 0/Gain#0:0
* 0/Gain#0:0 ==> 0/SEP#2:0
In addition to generating the bitstream, I also created and included the
required .yml files — specifically the block descriptor (gain.yml) and
image core (e310_rfnoc_image_core.yml). I confirmed that the image builder
detects them successfully when using --log-level debug.
However, when I try to recreate the block diagram in GNU Radio Companion,
following the same structure as shown in the video, I encounter the
following error during Python code generation:
Generating: "/home/aufer/Projects/rfnoc-gain/rfnoc_gain_trial.py"
Generate Error: Undefined
>>> Failure
Traceback (most recent call last):
File
"/home/aufer/gnuradio-install/lib/python3.12/site-packages/gnuradio/grc/gui/Application.py",
line 758, in _handle_action
generator.write()
File
"/home/aufer/gnuradio-install/lib/python3.12/site-packages/gnuradio/grc/core/generator/top_block.py",
line 86, in write
for filename, data in self._build_python_code_from_template():
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File
"/home/aufer/gnuradio-install/lib/python3.12/site-packages/gnuradio/grc/core/generator/top_block.py",
line 135, in _build_python_code_from_template
connections=self._connections(),
^^^^^^^^^^^^^^^^^^^
File
"/home/aufer/gnuradio-install/lib/python3.12/site-packages/gnuradio/grc/core/generator/top_block.py",
line 328, in _connections
code = template.render(
^^^^^^^^^^^^^^^^
File "/usr/lib/python3/dist-packages/mako/template.py", line 438, in
render
return runtime._render(self, self.callable_, args, data)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/lib/python3/dist-packages/mako/runtime.py", line 874, in
_render
_render_context(
File "/usr/lib/python3/dist-packages/mako/runtime.py", line 916, in
_render_context
_exec_template(inherit, lclcontext, args=args, kwargs=kwargs)
File "/usr/lib/python3/dist-packages/mako/runtime.py", line 943, in
_exec_template
callable_(context, *args, **kwargs)
File "memory:0x77b7681a8ce0", line 32, in render_body
File "/usr/lib/python3/dist-packages/mako/runtime.py", line 230, in
__str__
raise NameError("Undefined")
NameError: Undefined
This occurs when GRC attempts to generate the .py file.
Could you please advise what might be missing or misconfigured to cause
this “Undefined” error?
Best regards,
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