[Discuss-gnuradio] Block to Load Taps From File

[Maximilian Stiefel]

Hello everybody,

it is as far as I know not that convenient to import taps from a filter 
design file to a design in grc.

On stackoverflow it was mentioned, that there is apparently a 
workarround using numpy.fromfile('filename'):

https://stackoverflow.com/questions/36744843/passing-taps-to-the-filter-using-file-in-gnuradio#36771263

However, this did not work for me, because numpy wants, so it seems, a 
plain csv file with the tap values. For this reason, I wrote a small 
block and pushed it to my fork to make it more convenient to just use 
the taps created with the gorgeous gr filter design tool. The block 
allows the following convenient work-flow:

Filter Design -> Save to File -> Add File Taps Loader block to grc 
design and by that import taps into grc design -> Change filter design 
in design tool -> Taps are automatically up-to-date.

https://github.com/m3x1m0m/gnuradio/blob/file_taps_loader/gr-blocks/python/blocks/file_taps_loader.py 


https://github.com/m3x1m0m/gnuradio/blob/file_taps_loader/gr-blocks/python/blocks/qa_file_taps_loader.py

https://github.com/m3x1m0m/gnuradio/blob/file_taps_loader/gr-blocks/grc/blocks_file_taps_loader.xml

Is this of any interest for others?

Also, I was for some reason not able to force the block being integrated 
into the section "File Operators". How is this done?

Regards,

Max