Re: gEDA-user: Gnetlist -g PCB

[John Doty <jpd@xxxxxxxxxxxxx>]

On Jun 29, 2008, at 4:49 AM, Wojciech Kazubski wrote:

> This is a bug in the library. The symbol pot-1.sym should have all  
> pins declared as passive instead of input/output.

No, it's a conceptual problem with DRC. It is perfectly reasonable to  
consider the pins on a pot as inputs or outputs. The classification  
depends on the *application*, not on the *part*, so it is insane to  
be classifying the pins on this kind of part.

Pintypes are only sensible in a narrow class of flows: outside of  
pure digital circuits using a single technology they don't make  
sense. It is not surprising that they are confusing to newbies: there  
is no way to make sense of them in general! Yet we grossly oversell  
drc2, spamming every user of gnetlist with "Remember to check that  
your schematic has no errors using the drc2 backend", an exhortation  
that grossly exaggerates drc2's utility. It certainly doesn't "check  
that the schematic has no errors": it mostly strains out gnats and  
swallows camels.

> There should be "pintype=pas" attribute for each pin instead of  
> "pintype=io".
> It is probably safe to ignore the warning.

The basic DRC should be much more limited. Right now, it's pretty  
useless: it complains about a host of non problems. Its purpose  
should be to detect problems in the translation from graphics to  
netlists, not to try to outguess the engineering behind the graphics.  
You can't do applied physics with clerical methods. It is not sane to  
attempt to do so.

>
> The same bug is in pot2.sym
>
>> I am a newbie using PCB.  I created a schematic with footprints,
>> values, etc.
>>
>> I used gnetlist -g drc2 and had one warning.
>>
>> WARNING: Pin(s) with pintype 'input/output': R101:3
>>         are connected by net 'GND'
>>         to pin(s) with pintype 'power': U101:7
>>
>> I used gsch2pcb and then pcb.  I recieved an error about pins  
>> numbered
>> 'n1' and 'n2.
>>
> Wojciech Kazubski
>> I used gnetlist -g PCB and saw the n1 and n2 pin numbers in
>> output.net.  I also see pins like n+ and n-.
>>
>> output.net is below.  I can post the schematic, if it will help.
>>
>> In pcb, none of the resistors or capacitors are connected with the
>> ratsnest.
>>
>> What am I doing wrong?
>>
>> tomdean
>>
>> G_CS    J107-4 J104-15
>> ADC6    J106-6 J104-6
>> R/W     J105-5 J104-9
>> ADC4    J106-2 J104-4
>> ADC5    J106-4 J104-3
>> ADC2    R104-n2 R103-n1 J104-2
>> unnamed_net2    R102-n1 R101-1
>> unnamed_net1    J105-3 R101-2
>> DAT7    J105-14 U101-13
>> DAT6    J105-13 U101-12
>> DAT5    J105-12 U101-11
>> DAT4    J105-11 U101-10
>> DAT3    J105-10 U101-6
>> DAT2    J105-9 U101-5
>> DAT1    J105-8 U101-4
>> DAT0    J105-7 U101-3
>> +12V    R104-n1 J103-15
>> R_PULSE J108-3 J103-6
>> R_INT   J108-2 J103-7
>> E1      J105-6 J103-8
>> LCD_CS  U101-2 J103-9
>> RS      J105-4 J103-5
>> TXD     J104-14 J102-4
>> RXD     J104-13 J102-3
>> SCK     J107-3 U101-8 J103-12 J101-6
>> A_CS    J104-10 J101-7
>> MOSI    J107-6 U101-1 J103-10 J101-5
>> Vcc     J108-1 C105-n+ C103-n+ J107-1 C101-n+ J105-1 J104-7 R102- 
>> n2 U101-14 U101-9 J103-3 C104-n- J102-2 C102-n+ J101-1
>> MISO    J107-5 J103-11 J101-4
>> IO      J108-4 J104-16 J104-11 J104-12 J104-5 J104-1 J103-14  
>> J103-1 J103-2 J102-6 J102-7 J102-9 J102-10 J101-8 J101-3
>> GND     J108-5 C105-n- R103-n2 C103-n- J107-2 J106-5 J106-1 J106-3  
>> C101-n- J105-2 J104-8 R101-3 U101-7 J103-16 J103-13 J103-4 J102-8  
>> J102-5 C104-n+ J102-1 C102-n- J101-2
>>
>>
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>
>
>
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John Doty              Noqsi Aerospace, Ltd.
http://www.noqsi.com/
jpd@xxxxxxxxx




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