Re: [avr-libc-dev] fuse API on the xmega16a4

[Galen Seitz]

Weddington, Eric wrote:
> > -----Original Message-----
> > The fuse API documentation doesn't seem to quite match up with the 
> > xmega implementation.  I tried using the FUSES macro, but it doesn't 
> > appear to be defined when targeting an xmega16a4.  However, the 
> > following does work.
> >
> > /* Configure fuses. */
> > NVM_FUSES_t __fuse FUSEMEM = {
> >    .FUSEBYTE0 = FUSE0_DEFAULT,
> >    .FUSEBYTE1 = 0x00,
> >    .FUSEBYTE2 = (FUSE_BODPD0),
> >    .FUSEBYTE4 = FUSE4_DEFAULT,
> >    .FUSEBYTE5 = (FUSE_BODACT0 & FUSE_BODLVL2 & FUSE_BODLVL0)
> > };
> >
> >
> > Is this a user error, a bug, or is the xmega fuse API intentionally 
> > different?
>
> My guess is that the API is intentionally different. However, it's a bug in 
> that avr-libc is not correctly accounting for the differences. That's something 
> we need to fix.

Would something like this be appropriate?

--- /usr/avr/include/avr/fuse.h 2010-03-10 16:32:49.000000000 -0800
+++ fuse.h      2010-03-13 10:54:26.000000000 -0800
@@ -261,8 +261,12 @@
 #endif

 #ifndef FUSES
+#ifdef __AVR_XMEGA__
+#define FUSES NVM_FUSES_t __fuse FUSEMEM
+#else
 #define FUSES __fuse_t __fuse FUSEMEM
 #endif
+#endif

 #endif /* !__ASSEMBLER__ */


--
Galen Seitz
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