On Thu, Jul 23, 2015 at 6:29 AM, Galiero Casay Gabriele <
gabriele.galieroca...@aalto.fi> wrote:
> Hello all,
>
> I was building my own block in C++ and I have one doubt about it. Some
> times my block has to work with float streams and sometimes with complex
> streams. There is one single input and output.
> I have implemented separately: sync_ff_impl.cc and sync_cc_impl.cc each
> one with its respective xml file to use it in gnuradio-companion. Now I
> wanted to have only one xml so that the block is type-selectable. Is there
> any template or way to make it? I have been checking the code from other
> type-selectable blocks but it did not help much.
>
> If there is some interest about what the block does, it basically adds a
> predefined preamble to the incoming packets, so that in reception the
> receiver is able to know when the packet starts.
>
> Thanks before hand.
> Best regards,
>
> Gabriele Galiero
>
Hi Gabriele,
There are tons of examples in the GNU Radio source tree for how to do this.
Look for any block that has a _xx or _vxx ending on it in the grc
directories and you'll see it. A good example is
blocks_multiply_const_vxx.xml:
<make>blocks.multiply_const_v$(type.fcn)($const)</make>
....
<param>
<name>IO Type</name>
<key>type</key>
<type>enum</type>
<option>
<name>Complex</name>
<key>complex</key>
<opt>const_type:complex_vector</opt>
<opt>fcn:cc</opt>
</option>
<option>
<name>Float</name>
<key>float</key>
<opt>const_type:real_vector</opt>
<opt>fcn:ff</opt>
</option>
<option>
<name>Int</name>
<key>int</key>
<opt>const_type:int_vector</opt>
<opt>fcn:ii</opt>
</option>
<option>
<name>Short</name>
<key>short</key>
<opt>const_type:int_vector</opt>
<opt>fcn:ss</opt>
</option>
</param>
So the $(type.fcn) is filled in with the "opt" parameter of the type
selected.
Tom
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