Re: GRC port type assignment in Python Block

On 07/26/2021 07:32 AM, Josh Morman wrote:
> Hi Jerrid,
>
> Your attempt at using structures to map to a complex type is sensible,
> but it appears that GRC doesn't parse this very well for at least the
> embedded python blocks. The UHD blocks are c++ based which just uses
> the io_signature object in the constructor which specifies a size, not
> a type.
>
> You may want to try just using non-vectored int16's as an interleaved
> stream and deinterleave in your python block
>
> Josh
>
The embedded python blocks (at least in 3.7) don't handle vectors very
well if their length isn't known until runtime, and for "very well" read
"not at all".
My own approach was to take in samples as scalars, and handle the
"shaping" inside the work function of the block, using run-time
parameters to
determine the shape. It's a pain, but it works.