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While programming an ATtiny or ATmega, avrdude prints the device signature, in this example it is an ATtiny.

avrdude: Device signature = 0x1e910a

Can I read this signature on a running device using C++ code (avr-gcc)? For ATmega1280 there is a chapter 29.6.10 writing about it, but I'm a bit puzzled by how I can code it in C++.

I want to be able to make the device send its device ID back to the controlling PC, so the PC can make decisions on it.

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You can use these macros that get defined automatically when you include <avr/io.h>:

SIGNATURE_0
SIGNATURE_1
SIGNATURE_2

For ATmega1280, they're defined as:

/* Signature */
#define SIGNATURE_0 0x1E
#define SIGNATURE_1 0x97
#define SIGNATURE_2 0x03

in iom1280.h (which is automatically included through <avr/io.h> when you compile code for the m1280)

For example, this will send the three bytes via UART:

uart_putc(SIGNATURE_0)
uart_putc(SIGNATURE_1)
uart_putc(SIGNATURE_2)

If you truly want to read the fuses, you'd need to use boot_signature_byte_get macro from <avr/boot.h>

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  • \$\begingroup\$ I used boot_signature_byte_get( 0x00 ), boot_signature_byte_get( 0x02 ), boot_signature_byte_get( 0x04 ) \$\endgroup\$ – jippie May 12 '12 at 12:42

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