Re: gEDA-user: A few questions about gschem, gnetlist, and gspiceui/ngspice

[Steve Meier <smeier@xxxxxxxxxxxxxxxxxxx>]

the gnetlist option -g tells genlist what backend file to use.

-g spice  uses the file  gnet-spice.scm  

on my machine it is found in /usr/local/share/gEDA/scheme

it is also found in the gnetlist source code in the scheme directory

Steve Meier


On Thu, 2008-10-23 at 11:17 -0700, Yamazaki R2 wrote:
> Hi all,
>    Let me just say that the gEDA suite is pretty robust for being an open
>    source project. For the most part I am happy with it and really
>    appreciate the work that's been put into this project. It's great EDA
>    option for the hobbyist as well as the professional. Now, I have a few
>    questions/issues that I can hopefully get cleared up:
>    1. The first thing I want to understand how the gnetlist scheme works
>    for the spice scheme (gnetlist -g spice). When I run this command,
>    what scheme backend files are processed? Only gnet-spice.scm? Or is
>    any other scheme processed along with it? The reason why I ask is
>    because when I take a look at gnet-spice.scm it seems to be getting
>    some variables from somewhere else, as in the file doesnt seem
>    self-contained.
>    The reason why I ask is because I was interested in editing the way
>    the netlister works. I created a 3 terminal nmos and pmos symbol and I
>    want to either hardcore a implicit bulk connection into the netlister
>    scheme or create a symbol attribute that specifies the bulk connection
>    in it, maybe using the net= attribute. When looking at the
>    gnet-spice.scm file, it doesnt show where its getting the number of
>    pins for mosfet devices. The way I was going to go about it was change
>    the number of pins to 3, then print the last net (the bulk) as a
>    netname thats hardcored.
>    2. I'm having a few issues with gschem. As of the current version, is
>    there a way make filled shapes for symbols that aren't
>    squares/circles? Such as a filled triangle? If not, does any
>    development version have this feature? Another issues/annoyance I'm
>    having with gschem is that the graphical interface inside the
>    schematic is kinda buggy. For example, if I route a net, then delete
>    it, the grid dots don't reappear until I either move the viewing plane
>    or zoom in/out. Is this how it's suppose to work or do I not have my
>    graphics library set up right? Another issue with gschem, is there
>    planned support to actual font rendering at some date rather than each
>    letter being it's own symbol? The reason I ask is because the way it's
>    setup right now causes the fonts too look garbled/unreadable if you're
>    not zoomed really far in.
>    3. In GSspiceUI, why don't transistors show up in the device list? Do
>    I not have it setup right or is this intentional? Also, why is the
>    option to probe current grayed out when I choose ngspice as the
>    simulation engine? Also, what is the proper probe syntax in ngspice to
>    probe drain/source/gate current in a mosfet? Also
>    collector/emitter/base current in a bipolar? Another (I think) bug in
>    GspiceUI is the fact that it rounds the output voltages/current too
>    much where when you plot it in gwave the granularity is bad. For
>    example It's impossible to graph voltages in the 10s of millivolts
>    because it sounds lots of steps as the same number. Try an input of a
>    5mVpp sine wave then plot it in gwave and see what I mean.
>    4. Speaking of gwave, how do I add the voltage/current/time/frequency
>    access to the plots? What about grid lines?
>    Thanks all
> 
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