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[avr-gcc-list] Re: Device fuses

From: Ned Konz
Subject: [avr-gcc-list] Re: Device fuses
Date: Sat, 22 Apr 2006 10:09:54 -0700

On Apr 21, 2006, at 11:18 PM, Björn Haase wrote:

"Anton Erasmus" <address@hidden> wrote:

Wouldn't it be worthwhile to add a method of specifying device fuses
in the C or assembler source file ?
I think something similar to the way the EEPROM and PROGRAM memory is

something like:

That would not be difficult at all. One could agree on the name of some section that contains data for the fuses and the lock-bits. One would do
something like:

#define SET_FUSE_BITS(F1,F2,F3,L) unsigned char fuses[4] __attribute___
((section (".fuses"))) = {F1,F2,F3,L};

The more time-consuming thing would be to teach your favorite programming tool
to actually use the data in the .elf file.

Not at all...

myprogram=$1; shift
avr-objcopy -j .fuses -O binary ${myprogram} fuses.bin
avrdude -p atmega128 -U lfuse:w:m:$(od -A n -t x1 -j 0 -N 1 fuses.bin | tr -d ' ') avrdude -p atmega128 -U hfuse:w:m:$(od -A n -t x1 -j 1 -N 1 fuses.bin | tr -d ' ') avrdude -p atmega128 -U efuse:w:m:$(od -A n -t x1 -j 2 -N 1 fuses.bin | tr -d ' ') avrdude -p atmega128 -U lock:w:m:$(od -A n -t x1 -j 3 -N 1 fuses.bin | tr -d ' ')

Ned Konz
MetaMagix embedded consulting

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