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	Fri, 20 May 2016 15:04:28 -0700 (PDT)
Date:	Sat, 21 May 2016 00:04:23 +0200
From:	"Nicklas Karlsson (nicklas DOT karlsson17 AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
To:	Peter Clifton <petercjclifton AT googlemail DOT com>
Cc:	geda-user AT delorie DOT com
Subject:	[geda-user] Re: PCB DRC - Hi guys --> clearance, net class
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Had an hour more to spend on this. I also discovered I already factored out different drc calculations in sub functions.

As is now pcb calculation for is called for each pin in each element. A global value is used for clearance and here a loop have to be added for each clearance value used.

There need to be a function to figure out which clearance value to use, probably: global, net class, net. If I get a few more hours this weekend I should give it a try.


Nicklas Karlsson



On Mon, 16 May 2016 11:59:43 +0100
Peter Clifton <petercjclifton AT googlemail DOT com> wrote:

> Hi All,  (OFFLIST - to avoid general flame war and bike-shed painting!).
> 
> 
> I hope things are going well with you all, this is a quick email to discuss
> PCB's DRC...
> 
> I'm currently working on a project involving some moderately sizable power
> converters operating at mains voltage, which, (as you might guess) involves
> a lot of regulatory compliance work regarding creepages and clearances.
> 
> As an aid to procrastination (and to help with the work), I started
> teaching the tools a few new tricks...
> 
> gnetlist, read and track "netclass=" attributes so I can identify which
> nets belong in clearance groups with chasis earth, DC-, DC+, etc...
> 
> PCB, ability to store netclass in the netlist, and actions to set it. (This
> might want to be reworked to be more general in future though).
> 
> gnet-pcbfwd.scm, read and emit netclass settings when driven by an updated
> gnetlist.
> 
> PCB, ability to determine, for given a piece of copper, pin etc.., which
> netclass it should belong to. (Currently this operation is moderately
> expensive, as it uses the "find" infrastructure to back track and find
> object (or X,Y) -> what is it connected to -> pins -> netlist -> nteclass).
> 
> 
> I've extended the "crosshair shows DRC clearance" to be able to figure out
> what netclass the lines you're drawing should belong to, and tweaked the
> auto-enforce DRC to allow any additional clearance required when colliding
> with objects belonging to a different netclass. Additional fields on object
> structures also allow me to render this additional clearance zone around
> obstacle objects as you hit them (allowing visualisation of where the
> auto-enforce has hit an obstacle, or to help you route manually if
> auto-enforce is turned off).
> 
> On my short-term TODO list, is fixing the auto-enforce behaviours to work
> properly for "all direction lines", and the single 45-degree lines editing
> modes. (They never did).
> 
> Currently, my netclass names (and clearance values) are hard-coded for my
> particular board, as I needed to make progress with the design (rather than
> worrying about how to save / restore clearance data for an arbitrary
> project) - this will also need addressing
> 
> 
> I've been thinking about the DRC, and will shortly come to a point where it
> could help dramatically to implement the use of netclass in the main DRC.
> 
> Nicklas - you expressed an interest in working on this at one point, so I'm
> including you here.
> 
> Britton - I recall (but not intimately) that you had a branch re-working
> some of the DRC code, so I'm wondering if this is relevant, or orthogonal
> to what I'm looking at here.
> 
> Do you think that between us we can work out a plan to hit improved DRC for
> multiple netclass with different clearance rules? I will probably make some
> initial attempt over the coming weeks, but figured it was more in the
> spirit of good collaboration to sound you guys out over it. (I'm still
> hopeful that I can re-align my "little" patch-series / mini-fork with git
> HEAD, so it stands a chance of merge rather than ever growing divergence.
> 
> Peter

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