serial_num.c

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


#if NRF_SDK_VER_MAJOR >= 15


#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];

void serial_num_generate(void)
{
    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];

    char* p_buf = (char*)g_extern_serial_number;
    int buf_len = SERIAL_NUMBER_STRING_SIZE + 1;
    sprintf(p_buf,
                   "%04x%08x",
                   serial_num_high_bytes,
                   serial_num_low_bytes);
}


#else


#define SERIAL_NUMBER_STRING_SIZE (16)

/**@brief Serial number generated.
 *
 * Serial number generated by the @ref serial_number_string_create function.
 */
uint16_t g_extern_serial_number[SERIAL_NUMBER_STRING_SIZE + 1];

void serial_num_generate(void)
{
    static char ser_number[1 + 2 * 8] = { 0 };

    g_extern_serial_number[0] = (uint16_t)APP_USBD_DESCRIPTOR_STRING << 8 |
                                          sizeof(g_extern_serial_number);

    uint32_t dev_id_hi = NRF_FICR->DEVICEID[1];
    uint32_t dev_id_lo = NRF_FICR->DEVICEID[0];

    sprintf(ser_number + 1, "%08x%08x", dev_id_hi, dev_id_lo);

    for(int i = 0; i < 1 + 2 * 8; i++) {
        g_extern_serial_number[i] = ser_number[i];
    }
}


#endif