Isaac,

The most definitive answer is to contact Microchip directly. I have had a l=
ot of
dealings with Microchip over the years and you will get a clear definitive =
answer.

The process could take a few days.

Walter..


Isaac Marino Bavaresco wrote:

> Changing tag because I think it entered the PIC domain.
>
> Just finished benchmarking my custom PIC18 'printf' against Microchip's
> original:
>
> Test code vas:
>
> unsigned long value =3D 1;
> while( 1 )
>     {
>     printf( "%lu", value );
>     value *=3D 10;
>     }
>
> int _user_putc( char c )
>     {
>     return 0;
>     }
>
> Please note that the function '_user_putc' was "neutralized" just to
> remove hardware times from the benchmark. We are testing just the
> mathematical portions of the process. Function "_user_putc" is what
> ultimately displays each character.
>
> Times for Microchip's original 'printf':
>
> value -> cycles
> 1 -> 2104
> 10 -> 3756
> 100 -> 5440
> 1,000 -> 7108
> 10,000 -> 8840
> 100,000 -> 10556
> 1,000,000 -> 12288
> 10,000,000 -> 14036
> 100,000,000 -> 15800
> 1,000,000,000 -> 17628
>
> Times for my improved 'printf':
>
> value -> cycles
> 1 -> 1255
> 10 -> 1347
> 100 -> 1621
> 1,000 -> 1895
> 10,000 -> 2229
> 100,000 -> 2503
> 1,000,000 -> 2777
> 10,000,000 -> 3111
> 100,000,000 -> 3385
> 1,000,000,000 -> 3659
>
> I think my routine is worth sharing but I'm afraid of doing this without
> knowing the legal implications, that's why I posted the original question=
..
>
> Regards,
>
> Isaac
>
> Em 15/2/2012 15:27, Isaac Marino Bavaresco escreveu:
> > Dear all,
> >
> >
> > Many should know that Microchip's MPLAB C18 compiler comes with full
> > source code of its libraries, even the lite and eval versions.
> >
> > I made many improvements to said files for my own use. My question is:
> > how could I share my improvements with others without breaching
> > Microchip's copyright?
> >
> > I have thought that perhaps I can publish the diffs between my versions
> > and Microchip's. Diff files bear a minimum of the original source code
> > just to contextualize where the changes are to be inserted. This way, b=
y
> > using my diffs alone nobody can retrieve Microchip's source code, he/sh=
e
> > would need to have already the original source code to apply the patche=
s
> > against.
> >
> > What do you think?
> >
> >
> > Some files I rewrote from scratch. Those I think are safe to share.
> >
> >
> > Best regards,
> >
> > Isaac
> >
>
> --
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> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist

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