Thanks for your help Paul.
I tried to apply your fix, but didn't understand where to do it. If I open
the python code of the Tx, but I don't see anywhere any append or the array
usage you mentioned :(
On Sat, Nov 6, 2021 at 9:43 AM Paul Atreides <maud.dib1...@gmail.com> wrote:
> 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
>>
>>
>>
