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From:	John Doty <jpd AT noqsi DOT com>
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Subject:	Re: [geda-user] pcb-rnd: parametric footprints (status update)
Date:	Sun, 19 Jul 2015 09:31:39 -0600
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On Jul 19, 2015, at 8:19 AM, Kai-Martin Knaak <kmk AT familieknaak DOT de> =
wrote:

> Erich Heinzle (a1039181 AT gmail DOT com) [via=20
> geda-user AT delorie DOT com] wrote:
>=20
>> in my opinion, one of the biggest hurdles/learning curves for new
>> users is getting workable footprints when moving from gschem to pcb.
>=20
> +1
>=20
>=20
>> Anything that simplifies generic footprint selection during design
>> is good for prospective users.
>=20
> The arguably easiest way would be to have footprint attributes set in=20=

> the default library. Of course a default footprint cannot suite every=20=

> need. But there are certainly standard footprints for standard=20
> components. They can provide a starting point which lets you do a=20
> working layout without having to dive into the depths of footprint /=20=

> symbol generation issues.=20

We have a standard for footprint naming that applies to more than 95% of =
components: =
http://wiki.geda-project.org/geda:pcb_footprint_naming_conventions. =
That=92s the place to start. I think these are what belong in library =
components.

But, as my layout folks remind me constantly, those are package names, =
not true footprint names. The footprints depend not only on the package =
but on the design rules and manufacturing process. Their names depend on =
the library you=92re using.
An 0805 resistor footprint may not be the same as an 0805 capacitor =
footprint if you=92re being fussy. But, of course, a library symbol =
shouldn=92t be that specific: the symbol creator doesn=92t generally =
know how the symbol will be used downstream.

So, I present a gnetlist script, map-footprints.scm, perhaps a baby step =
towards DJ=92s =93database=94. Typical usage:

gnetlist -m censor-fix.scm -m map-footprints.scm -m SDPCB-footprints.scm =
-g pads -o Driver.pads Driver.1.sch Driver.2.sch Driver.3.sch Stack.psch

SDPCB-footprints.scm defines the mapping for a specific downstream =
process with a specific footprint library.

Ideally, a footprint library curator with an interest in geda-gaf =
compatibility would maintain the necessary maps from gEDA standard =
footprint names to the actual names of the library footprints. But =
perhaps Scheme expressions are not the best representation for the map. =
That=92s not hard to change, of course.


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(use-modules (srfi srfi-1))

;; Constructor for list of prefixes and counts

(define footprint-list '())
(define (footprint-name . x)
	(set! footprint-list (cons x footprint-list)))

;; Wrap gnetlist:get-package-attribute

(define footprint-map-wrapped-gpa gnetlist:get-package-attribute)

(define (gnetlist:get-package-attribute refdes attribute)
	(let ((value (footprint-map-wrapped-gpa refdes attribute)))
		(if (equal? attribute "footprint") 
			(map-footprint 
				(footprint-map-wrapped-gpa refdes "device")
				 value)
			 value)))

;; Find the footprint map entry or #f

(define (find-footprint device footprint)
	(find (lambda (x) 
		(and (equal? device (car x)) (equal? footprint (cadr x))))
	footprint-list))

;; Extract the mapped footprint name from the entry or not

(define (map-footprint device footprint)
	(let ((f (find-footprint device footprint)))
		(if f (caddr f) footprint)))
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(footprint-name "RESISTOR" "0603" "RESC1608X55N")
(footprint-name "RESISTOR" "0805" "RESC2012X70N")
(footprint-name "RESISTOR" "1206" "RESC3216X84N")
(footprint-name "RESISTOR" "2010" "RESC5025X70N")
(footprint-name "RESISTOR" "2512" "RESC6332X70N")
(footprint-name "CAPACITOR" "0505" "CAPC1414X145N")
(footprint-name "CAPACITOR" "0603" "CAPC1608X87N")
(footprint-name "CAPACITOR" "0805" "CAPC2012X135N")
(footprint-name "CAPACITOR" "1206" "CAPC3216X190N")
(footprint-name "CAPACITOR" "1812" "CAPC4532X270N")
(footprint-name "CAPACITOR" "2225" "CAPC5664X155N")
(footprint-name "POLARIZED_CAPACITOR" "2711" "CAPPC7234X317N")
(footprint-name "POLARIZED_CAPACITOR" "2915" "CAPMP7238X317N")
(footprint-name "DIODE" "DO213AA"  "DIOMELF3517N")
(footprint-name "NPN_TRANSISTOR" "UB" "SOT95P237X122-3N")
(footprint-name "PNP_TRANSISTOR" "UB" "SOT95P237X122-3N")
(footprint-name "PNP_TRANSISTOR" "UB" "SOT95P237X122-3N")
(footprint-name "NMOS_TRANSISTOR" "TO252AA" "TO-252AA_GDS")
(footprint-name "PMOS_TRANSISTOR" "TO252AA" "TO-252AA_GDS")
(footprint-name "MMBFJ309" "SOT23" "SOT95P240X120-3N")
(footprint-name "LM195H" "TO39" "TO254P939H660-3")
(footprint-name "REFERENCE" "SO8" "SOIC127P600X175-8N")
(footprint-name "DUAL_OPAMP" "SO8" "SOIC127P600X175-8N")
(footprint-name "DG403" "SO16" "SOIC127P600X175-16N")
(footprint-name "MAX308CSE+" "SO16" "SOIC127P600X175-16N")
(footprint-name "AD5328" "TSSOP16" "SOP65P640X120-16N")
(footprint-name "MAX4594DCKR" "SC70" "SOT65P210X110-5N")
(footprint-name "MAX9180" "SC70-6" "SOT65P210X110-6N")
(footprint-name "ADA4805-1AKSZ" "SC70-6" "SOT65P210X110-6N")
(footprint-name "AD7984BRMZ" "MSOP10" "MSOP50P490X110-10N")
(footprint-name "DS26LV32A" "CFP16" "SOIC127P600X175-16N")
(footprint-name "Artix" "BGA484" "BGA484C100P22X22_2300X2300X260")
(footprint-name "2104D60M0000YAX" "FP14" "VECTRON_2104")
(footprint-name "LED" "0603" "LEDC1608X20N")
(footprint-name "EXC-3BB102H" "0603" "INDC1608X100N")
(footprint-name "IHLP5050FDER100M01" "IHLP5050" "IND_IHLP5050")
(footprint-name "MIL4922" "MIL4922" "INDM12861X584N")
(footprint-name "StackConn" "RC422-200-201-3900" "AIRBORN_RC422-200")
(footprint-name "HEADER14" "HEADER14SMT2MM" "MOLEX_87832-14")
(footprint-name "Header" "HEADER16" "FCI_95278-XXX-16LF")
(footprint-name "747467-1" "747467-1" "HARTING_DB9_09641227235")
(footprint-name "MDM9S" "MDM9S" "CONN_MDM-9S")
(footprint-name "TempConn" "MDM31P" "CONN_MDM-31P")
(footprint-name "Flexprint" "NK-2M2-051" "AIRBORN_NK-2M2-051")

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John Doty              Noqsi Aerospace, Ltd.
http://www.noqsi.com/
jpd AT noqsi DOT com



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