Here's an even more basic example that doesn't use
the opt tag. It shows my complete cluelessness about
xml, but it works.

https://github.com/drmpeg/gr-dvbs/blob/master/grc/dvbs_puncture_bb.xml

Ron

On 5/6/2014 11:55 AM, Jonathan Fox wrote:
Thanks for the response, I was looking at the opt tags and I am still confused about how to do it. Do I need to set it up like this:

<make>specsense.energy_detector_sink_f($vlen, $eta, $white_space.val, $samp_rate, $cntr_freq, $verbose)</make>

<param>
<name>Desired Detection</name>
<key>white_space</key>
<type>bool</type>
<option>
<name>Open Band</name>
<value>True</value>
<opt>val:True</opt>
</option>
<option>
<name>Closed Band</name>
<value>False</value>
<opt>val:False</opt>
</option>
</param>

<param>
<name>Verbose</name>
<key>verbose</key>
<type>bool</type>
<option>
<name>Yes</name>
<value>True</value>
<opt>val:True</opt>
</option>
<option>
<name>No</name>
<value>False</value>
<opt>val:False</opt>
</option>
</param>

Thanks,

Jon


On Tue, May 6, 2014 at 11:08 AM, Ron Economos <w...@comcast.net <mailto:w...@comcast.net>> wrote:

    Take a look at:

    https://github.com/BogdanDIA/gr-dvbt/blob/master/grc/dvbt_inner_coder.xml

    Ron


    On 5/6/2014 7:00 AM, Jonathan Fox wrote:

        I have two out of tree blocks I want to add to GRC, everything
        compiles and installs correctly except for the GRC component
        (not shown in GRC). So this should be an XML issue and I think
        it is related to my attempts at making a drop down option
        choice concerning the detection of white space/closed
        frequencies and verbose output. My XML is attached below and
        you can see that under Params Desired Detection and Verbose
        have options.

        When I look at other stock GNU Radio block's XML like the low
        pass filter, I see that some params have opt tags. Do I need
        these also, if so how would I use them in my case?

        Thanks,

        Jon


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