Marcus,

I think what you said makes sense. I was initially thinking I would have a
synchronous block with a message port output, but if I can keep it as
simple as a sync block with two outputs just with different sizes, then
that is where I will start.

Thanks,
Alex.

On Tue, Jul 23, 2019 at 9:16 AM Müller, Marcus (CEL) <muel...@kit.edu>
wrote:

> Hi Alex,
>
> to get this straight: on your monitoring output, you get one item of
> output per item of input? (an input item being a vector, and a
> monitoring output item being a number)
>
> Then, everything is well: The thing is still a sync block, just one
> where not all output item sizes are identical, and not all are
> identical to the input item sizes.
>
> Even if that's not the case, the right way here would be to write a
> general block with streams, not an asynchronous messaging block, since
> the monitoring data is "synchronous" to the other data.
>
> Best regards,
> Marcus
>
> On Tue, 2019-07-23 at 09:10 -0500, Alex Roberts wrote:
> > I'd like to monitor an internal variable on a DSP block. have not made a
> custom block before but have read through some tutorials.
> >
> > Since the DSP inputs and outputs are vectors, and the variable is a
> single item whose value is dependent on the processing of the vector, the
> number of outputs does not match the number of inputs. The value is updated
> after each input vector is processed. Does this mean I should use the
> message port to asynchronously output the variable, or can I simply add
> another port and output the value as say a float or integer that is
> synchronously updated with the block?
> >
> > For example, in a Reed-Solomon implementation, how could I add an output
> to monitor the number of errors corrected?
> > _______________________________________________
> > Discuss-gnuradio mailing list
> > Discuss-gnuradio@gnu.org
> > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>
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