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From:	"Vladimir Zhbanov (vzhbanov AT gmail DOT com) [via geda-help AT delorie DOT com]" <geda-help AT delorie DOT com>
Date:	Thu, 28 Jul 2016 16:36:52 +0300
Message-ID:	<CAMvDHVCecAztKdq1UAWNN6QsvWJQOzTAm_BExJQ8NpVXDGJQ4w@mail.gmail.com>
Subject:	Re: [geda-help] gschem to gnucap simulation with gaw waveform output
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John,

On 7/22/16, John Griessen (john AT ecosensory DOT com) [via
geda-help AT delorie DOT com] <geda-help AT delorie DOT com> wrote:
> I've hassled with gwave before and it went unmaintained and now there is gaw
> waveform viewer.
>
> There is a nice write by up on how to use makefiles to drive simulation from
> schematics when you have a complicated enough network
> to analyze that entering it in line by line as a netlist is not productive:
>   http://www.johannes-bauer.com/electronics/gnucap/
>
> It depends on gwave though, so it won't help as is.  I substituted gaw and
> got the makefile rewritten to use it, so I
> plan to write it up on a blog -- sometime soon.
>
> Here's a screenshot of analyzing a volt doubler:
> http://ecosensory.com/tek/gaw-doubler-simul.png
>
> I ran it with a makefile, so it has very quick iteration speed, similar to
> the Kicad demo video:
> https://www.youtube.com/watch?v=A2_-hdRcf4U
> but using gschem and gnetlist.
>
>
>
> On 07/22/2016 12:17 PM, Vladimir Zhbanov (vzhbanov AT gmail DOT com) [via
> geda-user AT delorie DOT com] wrote:
>  > I have prototyped some (very) minimal simulation workflow. I
>  > did it when I learned nullor. If anybody is interested, I could
>  > publish the code.
>
>
>
> I'm interested in seeing whatever is easy to publish.  It could help some
> way, even if I stay with gschem/gnucap/gaw/make.
>

I've just read the tutorial you've mentioned. AFAIR, we have the
same for ngspice in our wiki.

Before I used the same Makefile approach to work on
simulations. Then I wrote a little simulation script which does
almost the same as the tutorial says. The differences are as
follows:

  - you have to add a spice include symbol and chose the file
    where your simulation commands would live using the file=
    attribute, then you can do two files -- one for ngspice and
    one for gnucap -- because some their commands may differ
    (AFAIR, even `tran' differs) and compare simulations
    (sometimes one of them would fail while another one works);

  - I used the spice-sdb option "sort_mode" in order to
    have less mess in CVS;

  - I used batch mode and looked at the simulator output in the
    background terminal

  - shortkeys also exist for editing the resulting netlist and
    launch your wave viewer (it is "gwave" in the code, however
    "gaw" should work as well)

I load it in my ~/.gEDA/gschemrc like this:

  (load "/path/to/simulation.scm")

Since I edited it several times and rewrote its style a couple of
days ago, something may not work, though I hope it works as it
is (though you have to change "gwave" to "gaw" if you use the
latter).

Slightly OT: Russian speacking users may find my translation of
the gnucap manual done a couple years ago.

One more remark: gnucap can sweep values itself.

  Vladimir

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