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Re: [Discuss-gnuradio] hier block inside a hier block

From: Josh Blum
Subject: Re: [Discuss-gnuradio] hier block inside a hier block
Date: Thu, 02 Apr 2009 22:05:30 -0700
User-agent: Thunderbird (X11/20090318)

Kieran Brownlees wrote:
Hello all,

I am not sure whether this is strange behaviour or I am misunderstanding
what you can do with hier_blocks.

Problem is best described with an example:

from gnuradio import gr
class h_block(gr.hier_block2):
    def __init__(self):

        hblock2 = h_block2()
        self.connect(self, hblock2)

i would change this last line to:
self.connect(self, gr.kludge_copy(gr.sizeof_float), hblock2)

hier blocks dont like to connect their virtualized inputs and outputs directly to other hier blocks. They require something substantial in-between. Thats is why we have kludge_copy, which just takes data from the h_block and passes it to the h_block2 input, just so long as the two h_blocks dont have to communicate directly!

Im not sure if there is a ticket about this, maybe http://gnuradio.org/trac/ticket/161 is related.


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