Mark this one resolved. I was just missing something from my XML file. On Tue, Jul 31, 2012 at 4:59 PM, Jonathan Fox <[email protected]>wrote:
> Thanks. I completely forgot about the filters in the front of the > flowgraph. Removing them fixed the problem. > > I still have not figured out the vector thing though. > > -Jon > > > On Tue, Jul 31, 2012 at 1:11 AM, Josh Blum <[email protected]> wrote: > >> >> >> On 07/30/2012 11:20 AM, Jonathan Fox wrote: >> > On Fri, Jul 27, 2012 at 6:12 PM, Josh Blum <[email protected]> wrote: >> > >> >> >> >> >> >> On 07/27/2012 02:01 PM, Jonathan Fox wrote: >> >>> I am trying to create a custom block that does energy detection. I >> used >> >> the >> >>> gr-modtool.py to generate the appropriate directory and files and >> added >> >> my >> >>> algorithm and necessary code to the header and cc. I also added the >> XML >> >>> file for the GRC It compiled without error but when I tried testing it >> >> out, >> >>> I got this error: >> >>> >> >>> linux; GNU C++ version 4.6.3; Boost_104601; >> UHD_003.004.002-181-g25649781 >> >>> >> >>> Traceback (most recent call last): >> >>> File "/home/jonfox/spectrum_sensing_test.py", line 21, in <module> >> >>> import specsense >> >>> File "/usr/local/lib/python2.7/dist-packages/specsense/__init__.py", >> >> line >> >>> 45, in <module> >> >>> from specsense_swig import * >> >>> File >> >>> "/usr/local/lib/python2.7/dist-packages/specsense/specsense_swig.py", >> >> line >> >>> 26, in <module> >> >>> _specsense_swig = swig_import_helper() >> >>> File >> >>> "/usr/local/lib/python2.7/dist-packages/specsense/specsense_swig.py", >> >> line >> >>> 22, in swig_import_helper >> >>> _mod = imp.load_module('_specsense_swig', fp, pathname, >> description) >> >>> ImportError: libgnuradio-specsense.so: cannot open shared object >> file: No >> >>> such file or directory >> >>> >> >> >> >> First off, does the file really exist, if not is it installed, but >> under >> >> the wrong name or wrong directory? >> >> >> >> If its there, sometimes running sudo ldconfig fixes issues like this. >> >> >> >>> specsense is the module I created with the modtool but I did not >> modify >> >> the >> >>> swig file. Any ideas on what I did wrong here? >> >>> >> >>> Also, it seems that my code for having a vector input does not hold up >> >> and >> >>> I have to manually change the input type in the appropriate python >> script >> >>> despite setting it in GRC already. Is there any documentation on >> adding >> >>> vector inputs and outputs? >> >>> >> >> >> >> any code snippets with the problem that you can post? >> >> -josh >> >> >> >> _______________________________________________ >> >> Discuss-gnuradio mailing list >> >> [email protected] >> >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> >> >> > >> > Sudo ldconfig worked. Now I get this: >> > >> > Traceback (most recent call last): >> > File "/home/jonfox/gnuradio/spectrum_sensing_test.py", line 214, in >> > <module> >> > tb.Run(True) >> > File >> > >> "/usr/local/lib/python2.7/dist-packages/grc_gnuradio/wxgui/top_block_gui.py", >> > line 76, in Run >> > self.start() >> > File >> "/usr/local/lib/python2.7/dist-packages/gnuradio/gr/top_block.py", >> > line 97, in start >> > self._tb.start(max_noutput_items) >> > File >> > >> "/usr/local/lib/python2.7/dist-packages/gnuradio/gr/gnuradio_core_runtime.py", >> > line 1768, in start >> > return _gnuradio_core_runtime.gr_top_block_sptr_start(self, >> > max_noutput_items) >> > RuntimeError: gr_buffer_add_reader: nzero_preload must be >= 0 >> > >> >> Looks like thats what happens when history is initialized to something >> <= 0. Perhaps something is not initialized in your app or defaulted to >> zero? >> >> Perhaps a set of filter taps is empty, they often affect how history() >> is set >> >> -josh >> >> ~/src/gnuradio/gnuradio-core/src/lib/runtime$ grep gr_buffer_add_reader * >> gr_buffer.cc:gr_buffer_add_reader (gr_buffer_sptr buf, int >> nzero_preload, gr_block_sptr link) >> gr_buffer.cc: throw std::invalid_argument("gr_buffer_add_reader: >> nzero_preload must be >= 0"); >> gr_buffer.h: friend GR_CORE_API gr_buffer_reader_sptr >> gr_buffer_add_reader (gr_buffer_sptr buf, int nzero_preload, >> gr_block_sptr link); >> gr_buffer.h:gr_buffer_add_reader (gr_buffer_sptr buf, int nzero_preload, >> gr_block_sptr link=gr_block_sptr()); >> gr_buffer.h: gr_buffer_add_reader (gr_buffer_sptr buf, int >> nzero_preload, gr_block_sptr link); >> gr_buffer.i:%rename(buffer_add_reader) gr_buffer_add_reader; >> gr_buffer.i:gr_buffer_reader_sptr gr_buffer_add_reader (gr_buffer_sptr >> buf, int nzero_preload, gr_block_sptr link); >> gr_flat_flowgraph.cc: detail->set_input(dst_port, >> gr_buffer_add_reader(src_buffer, grblock->history()-1, grblock)); >> gr_flat_flowgraph.cc: detail->set_input(i, >> gr_buffer_add_reader(src_buffer, block->history()-1, block)); >> > >
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