Re: [Discuss-gnuradio] Custom OFDM Carrier Allocator block

[Michael Dickens]

HI Alice - When you edited the XML file, did you change the "key",
"category", "import", or "make" parts? For example, if I were to make a
copy of "ofdm_sync_sc_cfb" into an OOT called "FOO", then I'd need to do
the following for it to not be a duplicate of the original:
{{{
  <key>FOO_ofdm_sync_sc_cfb</key>
  <category>[FOO]</category>
  <import>import FOO</import>
  <make>FOO.ofdm_sync_sc_cfb($fft_len, $cp_len, $use_even_carriers,
  $threshold)</make>
}}}
There might be other files that need editing, too. A picture of a GRC
flowgraph isn't too enlightening. Hope this helps! - MLD

On Wed, Sep 27, 2017, at 11:36 AM, Alice Lo Valvo wrote:
> I have duplicated the OFDM Carrier Allocator block, because I would that
> the
> occupied carriers parameter was not a variable but an input of the 
> block. I added this:
> 
> tagged_stream_block("allocator_alix",
>                gr::io_signature::make2(2, 2, sizeof(gr_complex), 
> sizeof(int)),
>                gr::io_signature::make(1, 1, sizeof(gr_complex) * 
> fft_len), len_tag_key),
>      d_fft_len(fft_len),
> 
> ...
> 
> 
> and I added right line in the .xml file.
> When I execute the flow graph in GRC this is the error that I see:
> 
> gr::log :FATAL: allocator_alix0 - Missing a required length tag on port 
> 1 at item #0
> thread[thread-per-block[11]: <block allocator_alix (12)>]: Missing 
> length tag.
> 
> I don't understand what I have to do for solve this.
> I have attached part of the flow graph.
> Thanks in advance,