Message-ID: <5085AB12.6030104@sbcglobal.net>
Date: Mon, 22 Oct 2012 13:22:42 -0700
From: "Girvin R. Herr" <girvin DOT herr AT sbcglobal DOT net>
User-Agent: Thunderbird 2.0.0.24 (X11/20100228)
MIME-Version: 1.0
To: geda-user AT delorie DOT com
Subject: Re: [geda-user] Pin labeling: best practices?
References: <20121021202359 DOT GA24620 AT fi DOT muni DOT cz> <201210212130 DOT q9LLUHwt025462 AT envy DOT delorie DOT com> <20121021215442 DOT GB24620 AT fi DOT muni DOT cz>
In-Reply-To: <20121021215442.GB24620@fi.muni.cz>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Reply-To: geda-user AT delorie DOT com


Jan Kasprzak wrote:
> DJ Delorie wrote:
> : 
> : What I do is split MCUs up into functional blocks - one block for all
> : the power/gnd pins, one for ISP, one for external memory bus, etc.
> : Then you can fiddle with block variants on a per-project basis.
> : 
> : As for design-specific pin functions, what I do is leave the symbol's
> : pin named according to what the mcu's documentation uses, so that I
> : can remember what pin it "is" according to the mcu.  Then I label the
> : net coming out of that pin right at the pin, with its design-specific
> : purpose.
> : 
> : So, a pin that's GPIO port 9 bit 4, that's TxD3, that I happen to be
> : using for the console, might be named P94/TxD3 with the net named
> : CONSOLE_TX.
>
> 	Naming nets instead of pins seems reasonable, thanks! There is
> a problem wrt. my design with this approach, though: some pins of the MCU
> are used for programming as well as for other purposes. For example,
> one pin is used as clock input when downloading the firmware, and as
> a PWM output in normal operation. So I want the programming connector
> pin to be labeled "clock", but the whole net (maybe including
> the MCU pin) should be labeled "PWM 1" or something like that.
>
> 	IOW, I want the "clock" label to be visible somewhere near the
> connector pin (both in the schematics and in the PCB silk layer),
> and the label "PWM 1" visible near the CPU pin. How do you suggest to
> handle multi-purpose nets/pins?
>
> -Yenya
>   
Yenya,
I sometimes use the "Comment" attribute to add notes or other 
non-intelligent attributes to symbols, such as a panel name in quotes 
for a control.  Attach the attribute to a symbol and it will move with 
the symbol.  You can always edit its location and text attributes.  You 
can add as many "Comment" attributes as you want to a symbol.  I don't 
know if comment attributes are imported to PCB, but they are on the 
schematic if set to visible.
Girvin Herr