owner-nrf52sdk/nRF5_SDK_17.0.2/components/libraries/usbd/app_usbd_serial_num.c

/**
 * Copyright (c) 2018 - 2020, Nordic Semiconductor ASA
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form, except as embedded into a Nordic
 *    Semiconductor ASA integrated circuit in a product or a software update for
 *    such product, must reproduce the above copyright notice, this list of
 *    conditions and the following disclaimer in the documentation and/or other
 *    materials provided with the distribution.
 *
 * 3. Neither the name of Nordic Semiconductor ASA nor the names of its
 *    contributors may be used to endorse or promote products derived from this
 *    software without specific prior written permission.
 *
 * 4. This software, with or without modification, must only be used with a
 *    Nordic Semiconductor ASA integrated circuit.
 *
 * 5. Any software provided in binary form under this license must not be reverse
 *    engineered, decompiled, modified and/or disassembled.
 *
 * THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE
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#include "app_usbd_serial_num.h"

#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <inttypes.h>
#include "app_usbd.h"

#define SERIAL_NUMBER_STRING_SIZE (12)

/**@brief Serial number generated.
 *
 * Serial number generated by the @ref serial_number_string_create function.
 */
uint8_t g_extern_serial_number[SERIAL_NUMBER_STRING_SIZE + 1];


/**@brief Function for creating the serial number string from a regular C string.
 *
 * @param[in]  p_serial_number_string  The serial number string. Must be terminated with \0.
 */
static void string_create(char * p_serial_number_string)
{

    for (uint32_t i = 0; i < strlen(p_serial_number_string); i++)
    {
        g_extern_serial_number[i] = (uint8_t)p_serial_number_string[i];
    }
}


void app_usbd_serial_num_generate(void)
{
    char serial_number_string[SERIAL_NUMBER_STRING_SIZE + 1];
    const uint16_t serial_num_high_bytes = (uint16_t)NRF_FICR->DEVICEADDR[1] | 0xC000; // The masking makes the address match the Random Static BLE address.
    const uint32_t serial_num_low_bytes  = NRF_FICR->DEVICEADDR[0];

    (void)snprintf(serial_number_string,
                   SERIAL_NUMBER_STRING_SIZE + 1,
                   "%04"PRIX16"%08"PRIX32,
                   serial_num_high_bytes,
                   serial_num_low_bytes);

    string_create(serial_number_string);
}