On Wed, 2021-03-24 at 18:38 +0000, Michael A Ray wrote:
>
> I want to delve into protocol decoders. For one thing I want to
> write a decoder which will read analog data from the 'scope
> samples and perform a DFFT on the data, so that I can see a
> frequency domain spectrum.
>
> This is because I am blind and cannot see pulseview, of course.
The current sigrok infrastructure for protocol decoders
exclusively accepts logic traces as inputs. Decoder output is
either annotations (presented graphically or textual depending on
the libsigrokdecode using applications), Python output for the
consumption by stacked decoders (which again output annotations
and/or Python and/or binary), or binary output (their meaning
totally depends on the individual decoder which creates them).
There is a recent addition of logic traces as output out of a PD.
But IIUC it's a feature that is exclusive to pulseview, and very
probably is not supported by any other application, and cannot be
used as input for other decoders (not at all, or not at the same
time with other logic input or with output from other decoders).
I could be wrong there, am not speaking for the feature's author,
am just stating my perception. Haven't even used that logic
output feature myself, only skimmed the commits when they
happened.
> But having installed sigrok-cli, libsigrok and libsigdecode
> from git, I do not seem to have a sigrokdecode Python package
> anywhere on my system.
>
> Can somebody advise me how to get this installed?
You don't. There is no such thing as an installable Python
package which binds the libsigrokdecode library or makes sigrok
decoders available to you. Python is _embedded_ into sigrok using
applications. See the wiki and search the mailing list. You'd
essentially have to do what these applications do to get the
input data which then is fed to the decoding library. There may
be gists which try to provide you with such an environment, but
they may be incomplete or not representative for what existing
libsigrokdecode using applications really do in combination with
libsigrok. Their existance probably is motivated by getting
_some_ essential part running in standalone mode during initial
Python decoder creation, but they certainly don't represent a
full environment that represents the feature set of mainline
sigrok applications.
> I may not be able to run any decoders on output from the
> 'scope. But running them and looking at the operations against
> LA data, I should be able to figure out how to do my DFFT.
Maybe you are not looking for protocol decoders as such, but
something different perhaps?
virtually yours
Gerhard Sittig
--
If you don't understand or are scared by any of the above
ask your parents or an adult to help you.
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