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Re: [Discuss-gnuradio] Updating old 802.15.4 code to latest release

From: Dimitris Symeonidis
Subject: Re: [Discuss-gnuradio] Updating old 802.15.4 code to latest release
Date: Thu, 6 Nov 2008 17:02:39 +0100

I gave it a shot, didn't work though...
I was getting the error "ValueError: port number 0 exceeds max of (none)"

here's my hier_block2:
and here's my top_block:

Any other ideas?

Dimitris Symeonidis
"If you think you're too small to make a difference, try sleeping with
a mosquito!" - Amnesty International

On Tue, Nov 4, 2008 at 17:58, Leslie Choong <address@hidden> wrote:
> Hi Dimitris, I did find the source of the problem. I needed to add
> "self" at the beginning (and sometimes end) of the argument list for
> self.connect(). I looked through examples in the gnuradio codebase.
> Jonathan offered this explanation as to why it is wired up that way
> when I didn't think it made much sense:
>> Is there a reason for having self be passed along the way it is in 
>> hier_block2?
> Yes.  "self" in the connect command refers to an external port of the
> hierarchical block.  Many hierarchical blocks are linear chains of
> blocks internally, with a single external input port and a single
> external output port.  The shortcut method of wiring these is:
> self.connect(self, ..., ..., ..., ..., self)
> The non-shortcut way:
> self.connect(self, 0, ..., ...)
> ...
> self.connect(..., ...., self. 0)
> This means "connect external input port 0 to block ..., input port ..."
> and "connect block ..., output port ... to external output port 0".
> ------------------
> I hope that helps you out! Let me know if that fixed the problem. Good luck!
> -Leslie
> On Tue, Nov 4, 2008 at 7:23 AM, Dimitris Symeonidis <address@hidden> wrote:
>> Hi Leslie,
>> I have encountered the same problem in my RDS code
>> (https://www.cgran.org/wiki/RDS)
>> The error comes up because I have a top_block that creates a msg_queue
>> and passes it (as an argument) to a hier_block2.
>> This hier_block2 then outputs to the queue. I am receiving the same
>> error message (try running rds_scope_pll_test.py under src/python,
>> which calls rds_rx.py).
>> I haven't yet had the time to look into this, because I resolved it by
>> integrating the hier_block2 functionality inside the top_block (look
>> at usrp_rds_scope_pll.py)
>> If you do find the source of the problem, I would appreciate it if you
>> pass it on to me
>> Kind regards, and good luck
>> Dimitris Symeonidis
>> "If you think you're too small to make a difference, try sleeping with
>> a mosquito!" - Amnesty International
>> On Wed, Oct 29, 2008 at 03:34, Leslie Choong <address@hidden> wrote:
>>> Hi everyone,
>>> I'm currently updating Thomas Schmid's old 802.15.4 demodulation code.
>>> It has been tested and works with at least revision 7596 of the
>>> gnuradio trunk. I've been trying to update the code to work with the
>>> latest release of Gnuradio (3.1). I've looked at examples converting
>>> from hier_block to hier_block2 and flow_graph to top_block. I've
>>> implemented those changes but still run into this error:
>>> python: /usr/include/boost/shared_ptr.hpp:375: T*
>>> boost::shared_ptr<T>::operator->() const [with T = gr_basic_block]:
>>> Assertion `px != 0' failed.
>>> Searches for this error on the list did not turn up much. I was
>>> wondering if there was anything else that I missed. I've been banging
>>> my head on the wall about this trying to figure out a fix. I jumped
>>> into gdb and found that the code was crashing when trying to flatten
>>> the flow_graph. I turned on debugging messages for
>>> gr_hier_block2_detail.cc and here is the result of that:
>>> connecting: ieee802_15_4_demod(3):0 -> sos_packet_sink(8):0
>>> connect: src is hierarchical, setting parent to 0x89e3d00
>>> connecting: usrp1_source_c(1):0 -> pwr_squelch_cc(9):0
>>> connecting: pwr_squelch_cc(9):0 -> ieee802_15_4_demod_pkts(2):0
>>> connect: dst is hierarchical, setting parent to 0x88bc270
>>> start: entered
>>> flattening top_block
>>> Flattening edge usrp1_source_c(1):0->pwr_squelch_cc(9):0
>>> Flattening edge pwr_squelch_cc(9):0->ieee802_15_4_demod_pkts(2):0
>>> Resolving endpoint ieee802_15_4_demod_pkts(2):0 as an input, recursing
>>> Resolving port 0 as an input of ieee802_15_4_demod_pkts
>>> python: /usr/include/boost/shared_ptr.hpp:375: T*
>>> boost::shared_ptr<T>::operator->() const [with T = gr_basic_block]:
>>> Assertion `px != 0' failed.
>>> Aborted
>>> I have attached a patch for anyone who wants to look further. If you'd
>>> like to see all the code you can follow these steps to try it out
>>> yourself:
>>> svn checkout svn://acert.ir.bbn.com/svn/gr-ucla
>>> cd gr-ucla/trunk
>>> (copy changes.diff to this directory)
>>> patch -p0 -i changes.diff
>>> Then build it all:
>>> ./bootstrap && ./configure && make
>>> sudo make install
>>> then:
>>> cd src/examples
>>> ./cc2420_rxtest.py
>>> If you have any comments or leads on something else that I should look
>>> into I would really appreciate hearing it. Thanks for all your help!
>>> -Leslie Choong
>>> _______________________________________________
>>> Discuss-gnuradio mailing list
>>> address@hidden
>>> http://lists.gnu.org/mailman/listinfo/discuss-gnuradio

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