RE: [avrdude-dev] avrdude GUI with Fuse Calculator

[Weddington, Eric]

> -----Original Message-----
> From: Shaun Jackman [mailto:address@hidden 
> Sent: Thursday, November 29, 2007 1:06 PM
> To: Weddington, Eric
> Cc: address@hidden; address@hidden
> Subject: Re: [avrdude-dev] avrdude GUI with Fuse Calculator
> 
> On Nov 29, 2007 12:48 PM, Weddington, Eric 
> <address@hidden> wrote:
> ...
> > Note that a new API has been added to avr-libc that allows 
> the user to
> > set the fuses within an application, and these values will go into a
> > separate section within the resulting ELF file. To do this, 
> fuse data is
> > being added to each IO header file in avr-libc.
> 
> Each fuse bit is currently defined as an inverted mask. For example:
> #define BOOTRST ~_BV(0)  /* Select Reset Vector */
> I would prefer the flags be defined uninverted.
> EFUSE = ~(BOOTRST | BOOTSZ0 | BOOTSZ1);
> looks better to me than
> EFUSE = BOORST & BOOTSZ0 & BOOTSZ1;
> 
> This is a matter of preference though. I don't mean to start a
> painting-the-bikeshed argument. I just thought I'd take a quick poll.

Grrr. :-(
The API is already implemented and I'm trying to finish it up for the
next release of avr-libc/WinAVR/AVR Studio. We already had this
discussion.

Part of the reason that they are inverted is because the fuse itself is
inverted: logic 1 is unprogrammed, logic 0 is programmed.

Eric Weddington