Im also having the same error in this stage of the tutorial, running GNURadio 3.8.(3?)
Playing around with the embedded block and I also re-typed most of the lines. there were some white spaces I thought might be problematic, but I don’t think they were.
Wondering if it’s because the message_pub is trying to send a list inside a pmt which I think PMT’s are by nature immutable. is there a python_to_pmt(char_list) needed here? I’m gonna try it on 3.9 a little later see if I still have the error. I’ll report back. <end transmission> On Nov 4, 2021, at 11:34, Evgeny Hahamovich <evgymail@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
Hi Evgeny,
Good luck.
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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
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