I was able to get around the swig errors in the embedded block, but still need
to do more testing to see if the modulated data is exactly what it should be.
It looks correct so far.
I replaced append with numpy.append and also used “import array” to copy the
final char_list to a byte array
new_array=array.array(“B”, char_list)
That seemed to be what got around the swig issue as it was complaining about
the second argument.
“return _pmt_swig.init_u8vector(k, data)”
…
“argument 2 of type 'std::vector< uint8_t,std::allocator< uint8_t > > const &'“
<end transmission>
> On Nov 4, 2021, at 11:34, Evgeny Hahamovich <evgym...@gmail.com> wrote:
>
>
> Thank you Barry. Trying to follow your example. Here are 2 issues I
> encountered, will be glad if you can have a look:
>
> In the Tx, the flow seems to be running, but I don't see any signal, and also
> I get the following error message:
>
> handler caught exception: in method 'init_u8vector', argument 2 of type
> 'std::vector< uint8_t,std::allocator< uint8_t > > const &'
> Traceback (most recent call last):
> File "/usr/local/lib/python3/dist-packages/gnuradio/gr/gateway.py", line
> 78, in eval
> try: self._callback(arg)
> File "/home/.../epy_block_0.py", line 37, in handle_msg
> self.message_port_pub(pmt.intern('PDU_out'),
> pmt.cons(pmt.PMT_NIL,pmt.init_u8vector(out_len,(char_list))))
> File "/usr/local/lib/python3/dist-packages/pmt/pmt_swig.py", line 2775, in
> init_u8vector
> return _pmt_swig.init_u8vector(k, data)
> TypeError: in method 'init_u8vector', argument 2 of type 'std::vector<
> uint8_t,std::allocator< uint8_t > > const &'
> thread[thread-per-block[11]: <block Packet Format(3)>]: SWIG director method
> error. Error detected when calling 'feval_p.eval'
>
> do you know what could it mean?
>
> In the Rx, since I'm using GNURadio 3.8, I replaced the Adaptive Algorithm
> block with the CMA Equalizer block, and I'm wondering, should I also add a
> Polyphase clock sync block before it?
>
>
> Thank you,
> Evgeny
>
>> On Thu, Nov 4, 2021 at 2:09 AM Barry Duggan <ba...@dcsmail.net> wrote:
>> Hi Evgeny,
>>
>> Recently I wrote a tutorial on
>> https://wiki.gnuradio.org/index.php/Packet_Communications which should give
>> you a basic understanding. Be sure to study the Prerequisites first! I did
>> find that the examples did not work "out of the box".
>>
>> Good luck.
>> ---
>> Barry Duggan KV4FV
>> https://github.com/duggabe
>>
>> On Tue, 2 Nov 2021 18:12:10 +0200, Evgeny Hahamovich wrote:
>>
>> Hi all,
>>
>> I am interested to learn how to use the Packet Communications concept, and
>> hope to get your advice. I am trying to start with some QPSK or something
>> similar, based on the packet_tx & packet_rx examples, but getting lost
>> along the way...
>>
>> Can you maybe guide me to something basic I can use to start? Getting
>> totally lost with this :(
>> Especially with all the header parameters I should set up...
>>
>>
>> Thank you,
>> Evgeny
>>
>>
