Re: [Discuss-gnuradio] max_streams problem in own module

[Charles Clancy]

On Wed, 2 Mar 2005, Eric Blossom wrote:
> On Wed, Mar 02, 2005 at 10:23:22AM -0500, Charles Clancy wrote:
> > I'm trying to write a gnuradio 2.4 module that computes the phase of a
> > complex baseband signal, mostly as a learning excercise in developing a
> > 4-FSK receiver.  (Is there an existing module that could do this for me?)
>
> Yes:  gr.complex_to_arg ()

Cool, that seems to work.  Is there a derivative block?  Something that 
takes float f(x) and returns float f'(x)?

> >   File
> >   "/usr/local/lib/python2.3/site-packages/gnuradio/gr/basic_flow_graph.py",
> >   line 180, in _check_port
> >     if signature.max_streams () == -1: # infinite
> >   AttributeError: 'str' object has no attribute 'max_streams'
>
> The fact that the AttributeError is complaining that a string object ('str')
> doesn't have a 'max_streams' attribute is highly suspicious.
>
> Did you follow the examples in gr-howto-write-a-block?
>  http://www.gnu.org/software/gnuradio/doc/howto-write-a-block.html
>  ftp://ftp.gnu.org/gnu/gnuradio/gr-howto-write-a-block-0.2.tar.gz

The massive automake/autoconf structure made adapting the tar.gz version 
very difficult to work with.  I reverse engineered the post-configured 
makefiles and figured out exactly what commands I needed, and went from 
there.  I copied the code structure from the howto_square module, and 
double-checked against some of the gnuradio-core modules.

> Does the public constructor return a boost shared_ptr version of the pointer?
> Does your .i file use GR_SWIG_BLOCK_MAGIC(...)?

The mypkg_make_phase_cf function returns a mypkg_phase_cf_sptr.  My 
mypkg_phase_cf constructor calls the gr_block constructor.  My .i file 
contains "GR_SWIG_BLOCK_MAGIC(mypkg, phase_cf)".

[ t. charles clancy ]--[ address@hidden ]--[ www.cs.umd.edu/~clancy ]
[ computer science ]-----[ university of maryland | college park ]