hardware_id.c

 1// Copyright 2022 QMK
 2// SPDX-License-Identifier: GPL-2.0-or-later
 3
 4// For some reason this bit is undocumented for some AVR parts and not defined in their avr-libc IO headers
 5// See https://stackoverflow.com/questions/12350914/how-to-read-atmega-32-signature-row
 6#ifndef SIGRD
 7#    define SIGRD 5
 8#endif // SIGRD
 9
10#include <avr/boot.h>
11#include "hardware_id.h"
12
13__attribute__((weak)) hardware_id_t get_hardware_id(void) {
14    hardware_id_t id = {0};
15    for (uint8_t i = 0; i < 10; i += 1) {
16        ((uint8_t*)&id)[i] = boot_signature_byte_get(i + 0x0E);
17    }
18    return id;
19}