3

How can I read the fuse bits from within my sketch?

7

You can use the boot_lock_fuse_bits_get function from <avr/boot.h>.

#include <avr/boot.h>;

void setup()
{
    Serial.begin(57600);

    cli();
    uint8_t lowBits      = boot_lock_fuse_bits_get(GET_LOW_FUSE_BITS);
    uint8_t highBits     = boot_lock_fuse_bits_get(GET_HIGH_FUSE_BITS);
    uint8_t extendedBits = boot_lock_fuse_bits_get(GET_EXTENDED_FUSE_BITS);
    uint8_t lockBits     = boot_lock_fuse_bits_get(GET_LOCK_BITS);
    sei();

    Serial.print("Low:  0x");
    Serial.println(lowBits, HEX);
    Serial.print("High: 0x");
    Serial.println(highBits, HEX);
    Serial.print("Ext:  0x");
    Serial.println(extendedBits, HEX);
    Serial.print("Lock: 0x");
    Serial.println(lockBits, HEX);
}

void loop() 
{
}
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