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Subject: Re: [geda-user] Should uCtlr symbols have mutable attributes reflecting pinmux? Discuss.
From: Dave Curtis <davecurtis AT sonic DOT net>
In-Reply-To: <20130920144255.928688043C48@turkos.aspodata.se>
Date: Fri, 20 Sep 2013 08:51:41 -0700
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On Sep 20, 2013, at 7:42 AM, Karl Hammar wrote:

> Dave Curtis, 16 Jul:
>> Modern microcontrollers typically have several functions that can be 
>> brought out to each pin, under control of some pin routing registers.   
>> Typically, I've used a pinlabel such as:
>> 
>> pinlabel=PD5 (PCINT21/OC0B/T1)
>> 
>> which shows the canonical GPIO name, plus other possible functions in 
>> parens afterwards.
>> 
>> A few days ago I was showing a friend (a KiCAD user) the output from the 
>> symbol generator that I am working on, and he asked if there was a way 
>> to make the pinlabel reflect the actual pin function as deployed in the 
>> application, and lose all the other stuff.
> ...
> 
> If you are writing a symbol generator, wouldn't the simplest solution
> be to make a new symbol.

If you go with per-project symbol libraries, perhaps.  But also, remember that pin functions can change through the life of a project as you move the pin assignments around to ease routing or software.

In the end, I think a reasonable symbol generator needs to support all three methodologies.  Tools should support the user's choice in methodology, not impose a methodology.

-dave

> 
> I'm doing something similar with my pintosym.pl script.
> See 
> 
> http://turkos.aspodata.se/git/openhw/pdftosym/examples.pintosym/
> 
> for examples.
> 
> Regards,
> /Karl Hammar
> 
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