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From: "=?utf-8?Q?Stephan_B=C3=B6ttcher?= (geda AT psjt DOT org) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
To: <geda-user AT delorie DOT com>
Subject: Re: [geda-user] lepton netlist
References: <s6nil076f0t DOT fsf AT psjt DOT org>
	<20240424112803 DOT C0DAC81AB8A3 AT turkos DOT aspodata DOT se>
	<s6njzknc4rc DOT fsf AT psjt DOT org>
	<20240424134027 DOT DA8B681AB8A3 AT turkos DOT aspodata DOT se>
	<s6n8r12d6le DOT fsf AT psjt DOT org>
	<20240424211535 DOT 2838281AB8A3 AT turkos DOT aspodata DOT se>
Date: Thu, 25 Apr 2024 20:50:48 +0200
In-Reply-To: <20240424211535.2838281AB8A3@turkos.aspodata.se>
	(geda-user AT delorie DOT com's message of "Wed, 24 Apr 2024 23:15:35 +0200
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"karl AT aspodata DOT se [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
writes:

> Stephan:
> ...
>> >> My patch was doing simple text substitutions in attributes after the
>> >> hierarchy was built, so the parameters cannot effect the netlist
>> >> itself, just some output.  I used it only with value= attributes.  That
>> >> would be the minimal functionality.
>> >
>> > So, it would be the bom list and the like that would be affected ?
>> > In that case an external program could do the transform, so you do your
>> > usual stuff and then as a final step you modify some output files with a
>> > separate program. Would that be fine (at least till it is integrated 
>> > into lepton) ?
>> 
>> I extract my boms from the .pcb file, and usually there are a lot of
>> handwritten changes before it goes to a technician, so it is not
>> essential to have this functionally in the netlister.  When the bom now
>> says value=$R2 it is at least obvious where I need to add information :-)
> ...
>
> Soo, what do you use the substitution for ?

My boards often have a large number of instances of the same circuit,
with different gain configurations that are configured with parameter
attributes attached to the subschematics symbol instances to change some
resistor values.

And I have schematics in my big monorepro that are reused a lot across
different boards with some parameters.  For example, low noise
adjustable LDO regulators.

> ///
>
> My thoughts is more in line with
>
>  in a page
> C ... source_symbol.sym
> {
> T ...
> source=led_resistor
> input_voltage=12
> }
>
>  and its subpage
> C ... led.fp
> {
> T ...
> led_voltage=2
> led_current=0.020
> }
> C .... resistor.fp
> {
> T ...
> value=E6((input_voltage - led_voltage) / led_current)
> }
>
> where E6() chooses a nearest value in the E6 series, or
> if you like, the available values of som component serie.
>
> Also nice would it be if I could use units, like in
> led_current=20mA or at least 20m.
>
> I do have code for unit prefixes and E6 etc. in
> https://aspodata.se/git/openhw/bin/Prefix.pm
> https://aspodata.se/git/openhw/bin/Eseries.pm
>
> ///
>
>  Regarding bom's, I have 
> https://aspodata.se/git/openhw/bin/GnetBom2.pl
>  which converts lepton-netlist -g bom2 output file
>  to something like
>  (i.e. sorted by device, footprint, component value):
>
> Capacitor       ipc7351b_2012Ar.fp           1n             1 aC3
> Capacitor       ipc7351b_2012Ar.fp           10n            1 3C2
> Capacitor       ipc7351b_2012Ar.fp           15n 5%         8 t0C21 ...
> Capacitor       ipc7351b_2012Ar.fp           33n 5%         8 t0C11 ...
> Capacitor       ipc7351b_2012Ar.fp           100n          19 12C2 ...
> Capacitor       ipc7351b_2012Ar.fp           1u            10 12C1 ...
>
> Regards,
> /Karl Hammar
>

-- 
Stephan