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

Question

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

Answer 1

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() 
{
}