Hello,
I'm trying to work on GNU Radio and having trouble understanding some of the
Python code. I have a C/C++ coding background. I'm looking at the
ieee802.15.4 code found on CGRAN. It's about 4 years old and runs but doesn't
function anymore so I'm trying to fully understand it to fix it.
In one file (a file in src/example called cc2420_txtest.py) I have the
following line from a constructor for:
class transmit_path(gr.top_block)
...
...
...
self.packet_transmitter = ieee802_15_4_pkt.ieee802_15_4_mod_pkts(self,
spb=self._spb, msgq_limit=2)
Now in the src/python directory for this project I have ieee802_15_4pkt.py
which has the following class:
class ieee802_15_4_mod_pkts(gr.hier_block2):
"""
IEEE 802.15.4 modulator that is a GNU Radio source.
Send packets by calling send_pkt
"""
def __init__(self, pad_for_usrp=True, *args, **kwargs):[/code]
What I don't understand is the call to the constructor and the constructor
definition. Since it's using a number of advanced features, I'm having
trouble looking it all up in documentation.
What does it mean to call with spb=self._spb? In the example file, spb is set
= to 2 and so is self._spb. Is it a sort of pass by reference like C while
also assigning a value? Why the ** on kwargs then? as if it is a matrix
(and does anyone have any idea what kwargs are (as opposed to args)?)
I'm uncertain about the first argument, but I guess it must be the
transmit_path object passed in place of the usually implicit self... I'm just
not sure how Python figures out that it's not pad_for_usrp... magic I guess!
Thanks for your help,
Dave
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