unique_board_id.c

/**
 * Copyright (c) 2021 Raspberry Pi (Trading) Ltd.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

#include <stdio.h>

#include "pico/stdlib.h"
#include "pico/unique_id.h"

// RP2040 does not have a unique on-board ID, but this is a standard feature
// on the NOR flash it boots from. There is a 1:1 association between RP2040
// and the flash, so this can be used to get a 64 bit globally unique board ID
// for an RP2040-based board, including Pico.
//
// The pico_unique_id library retrieves this unique identifier during boot and
// stores it in memory, where it can be accessed at any time without
// disturbing the flash XIP hardware.

int main() {
    stdio_init_all();

    pico_unique_board_id_t board_id;
    pico_get_unique_board_id(&board_id);

    printf("Unique identifier:");
    for (int i = 0; i < PICO_UNIQUE_BOARD_ID_SIZE_BYTES; ++i) {
        printf(" %02x", board_id.id[i]);
    }
    printf("\n");
}