Hello all, I'm trying to write an OFDM mod/demod for the gnuradio companion and I'm running into a problem. I'm following the (now deprecated?) packet modulator code that was in GRC very closely. I have an OFDMDemod block which creates the following class when its used:
--- class OFDMDemodHelper(gr.hier_block2): """Forward data from ofdm demod to the gr data stream.""" def __init__(self, item_size, options): #create hier block gr.hier_block2.__init__( self, 'ofdm_demod', gr.io_signature(1, 1, Complex().get_num_bytes()), gr.io_signature(1, 1, item_size) ) #the message source (handles the output data stream) msg_source = gr.message_source(item_size, DEFAULT_QUEUE_LIMIT) msgq = msg_source.msgq() def callback(ok, payload): if ok: msgq.insert_tail(gr.message_from_string(payload, 0, item_size, len(payload)/item_size)) ofdm_demod = blks.ofdm_demod( fg=self, options=options, callback=callback, ) #connections self.connect(msg_source, self) self.connect(self, ofdm_demod.head) --- This is basically the same as the old packet demod code, with a few small changes for OFDM. Unfortunately, I get the following error: --- File "/home/dramudit/work/gnuradio/grc/src/SignalBlockDefs/Packet.py", line 337, in __init__ callback=callback, File "/usr/local/lib/python2.4/site-packages/gnuradio/blksimpl/ofdm.py", line 218, in __init__ options.log) File "/usr/local/lib/python2.4/site-packages/gnuradio/blksimpl/ofdm_receiver.py", line 56, in __init__ self.fg.connect(self.chan_filt, self.ofdm_sync) File "/usr/local/lib/python2.4/site-packages/gnuradio/gr/hier_block2.py", line 46, in connect self._connect(points[i-1], points[i]) File "/usr/local/lib/python2.4/site-packages/gnuradio/gr/hier_block2.py", line 50, in _connect (dst_block, dst_port) = self._coerce_endpoint(dst) File "/usr/local/lib/python2.4/site-packages/gnuradio/gr/hier_block2.py", line 61, in _coerce_endpoint raise ValueError("unable to coerce endpoint") ValueError: unable to coerce endpoint --- Any suggestions as far as fixing this error, or another approach? Thanks, Dev _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio