Atmel Studio 7 reading fuses in .elf for ATtiny20

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Hey all,

 

I'm trying to store the fuse byte for ATtiny20 in my .elf file to be used for production programming. Currently, I'm using Atmel Studio 7 for the production GUI but am open to other options.

 

I'm running into a couple issues:

 

First, the avr/io.h file for the ATtiny20 (iotn20.h) defines the fuse memory size as 0:

#define FUSE_MEMORY_SIZE 0

and therefore the standard method of defining FUSES after including <avr/fuse.h> do not work.

 

So, is this a bug in avr-libc?

 

Second, trying to declare and define my own __fuse value, I'm not getting the production programmer tool in Atmel Studio 7 to recognize the fuse section in the elf. If I load up the elf file, it un-disables the "Flash" checkbox but not the "Fuses" checkbox. This tells me Atmel Studio is not properly detecting the .fuse section. However, according to avr-objdump, it seems to be there.

#include <avr/io.h>
#include <avr/fuse.h>

unsigned char __fuse FUSEMEM = 0xDF;
> avr-objdump -s -j .fuse out/production.elf

out/production.elf:     file format elf32-avr

Contents of section .fuse:
 800042 df                                   .

Of note, I'm using my own build scripts on Windows 10.

 

Any idea how Atmel Studio parses .elf files for Fuses section?

Pushing AVRs to their limits

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Hi cinderblock,

 

You can look into,

http://www.atmel.com/webdoc/atme...

http://www.atmel.com/webdoc/atme...

 

-Partha