Re: [Discuss-gnuradio] Error in "Constellation Decoder" block

[Ben Reynwar]

Try changing:
  "digital.constellation_qpsk.base()"
to:
  "digital.constellation_qpsk().base()"

Note the brackets after the constellation_qpsk constructor.

On Thu, Mar 6, 2014 at 9:05 AM, Azza Ben Mosbah
<address@hidden> wrote:
> Thank you.
> Actually, I am doing it in the GRC interface.
>
> When I use the .base(), it returns the following error:
>
> Param - Constellation Object(constellation):
> Value "digital.constellation_qpsk.base()" cannot be evaluated:
> 'function' object has no attribute 'base'
>
> I don't know what is the matter. But, maybe, there is some issues with my
> GRC version (GNU Radio Companion 3.6.2).
>
>
> Regards,
>
> -----------------
> Azza Ben Mosbah
>
>
>
> On Thu, Mar 6, 2014 at 10:54 AM, Tom Rondeau <address@hidden> wrote:
>>
>> On Wed, Mar 5, 2014 at 8:59 AM, Azza Ben Mosbah
>> <address@hidden> wrote:
>> > Tom,
>> >
>> >
>> > Thank you for the help. But, even that didn't work.
>> >
>> > I tried a different approach. I configured the "Constellation Object"
>> > block
>> > with the symbol map and the constellation points. Then, I called it in
>> > the
>> > argument of the "Constellation Decoder" block. And it worked.
>> >
>> > I am still wondering what is the right way to define a
>> > 'digital_constellation_sptr' type in the "Constellation Decoder"
>> > argument
>> > without passing by the "Constellation Object" block.
>> >
>> >
>> > Regards,
>> > Azza
>>
>> Yes, that Constellation Object in GRC returns the .base()
>> automatically for you so that you can pass it to the Constellation
>> Decode/Receiver blocks easily.
>>
>> You really should be able to use the .base() method of those
>> constellation blocks this way. Are you in GRC doing this or doing your
>> own Python? There could be some issues with GRC properly interpreting
>> your casting using base() (which is likely related to why the
>> Constellation Objects just return the.base() method for you).
>>
>> Tom
>>
>>
>>
>> > On Tue, Mar 4, 2014 at 5:16 PM, Tom Rondeau <address@hidden> wrote:
>> >>
>> >> On Tue, Mar 4, 2014 at 4:17 PM, Azza Ben Mosbah
>> >> <address@hidden> wrote:
>> >> > Hi All,
>> >> >
>> >> > I am manipulating GNU Radio Companion.
>> >> > While using the "Constellation Decoder" block, I have put
>> >> > digital.constellation_qpsk as a "Constellation Object" argument. But,
>> >> > I
>> >> > have
>> >> > found an error when I have executed the flow graph:
>> >> >
>> >> > Traceback (most recent call last):
>> >> >   File "/users/anb10/metrics/error_rate.py", line 342, in <module>
>> >> >     tb = error_rate()
>> >> >   File "/users/anb10/metrics/error_rate.py", line 225, in __init__
>> >> >     self.digital_constellation_decoder_cb_0 =
>> >> > digital.constellation_decoder_cb(digital.constellation_qpsk)
>> >> >   File
>> >> >
>> >> > "/usr/lib64/python2.6/site-packages/gnuradio/digital/digital_swig.py",
>> >> > line
>> >> > 3096, in constellation_decoder_cb
>> >> >     return _digital_swig.constellation_decoder_cb(*args, **kwargs)
>> >> > TypeError: in method 'constellation_decoder_cb', argument 1 of type
>> >> > 'digital_constellation_sptr'
>> >> >
>> >> > I don't know what went wrong. I have even tried
>> >> > digital.psk.psk_constellation(m=4,mod_code='gray'),
>> >> > digital.constellation_8psk and
>> >> > digital.psk.psk_constellation(m=8,mod_code='gray') as a
>> >> > "Constellation
>> >> > Object" argument.
>> >> >
>> >> > So, what is the proper way to define the argument (Constellation
>> >> > Object)
>> >> > in
>> >> > the "Constellation Decoder" block?
>> >> >
>> >> > I hope you can give me some ideas. Any help is appreciated. Thank
>> >> > you.
>> >> >
>> >> > Regards,
>> >> > Azza
>> >>
>> >> Azza,
>> >>
>> >> Check out the documentation page:
>> >>
>> >>
>> >> http://gnuradio.org/doc/doxygen/classgr_1_1digital_1_1constellation__decoder__cb.html
>> >>
>> >> It's not entirely clear (unless you know to look for it). You want to
>> >> pass the constellation object using the base() parameter to get to the
>> >> parent class.  Basically, you'd call it:
>> >>
>> >> digital.constellation_decoder_cb(digital.constellation_qpsk.base())
>> >>
>> >> Tom
>> >
>> >
>
>
>
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