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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 2.0.0.21 (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): gr.hier_block2.__init__(self, "h_block", gr.io_signature(1,1,gr.sizeof_float), gr.io_signature(0,0,0)) 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.
-Josh
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