Reading the STM32 unique device ID in C

Di 03 Februar 2015
By Uli Köhler

In STM32

All STM32 microcontrollers feature a 96-bit factory-programmed unique device ID. However, for me it was hard to find an adequately licensed example on how to read it in a manner compatible with different families and compilers.

Here’s a simple header that defines a macro for the device ID address. While I checked the address for both STM32F4 and STM32F0 families, other families might have slightly different addresses for the device ID. Check the reference manual corresponding to your STM32 family if errors occur.

STM32-UID.h download
/**
 * A simple header for reading the STM32 device UUID
 * Tested with STM32F4 and STM32F0 families
 * 
 * Version 1.0
 * Written by Uli Koehler
 * Published on http://techoverflow.net
 * Licensed under CC0 (public domain):
 * https://creativecommons.org/publicdomain/zero/1.0/
 */
#ifndef __UUID_H
#define __UUID_H

#include <stdint.h>

/**
 * The STM32 factory-programmed UUID memory.
 * Three values of 32 bits each starting at this address
 * Use like this: STM32_UUID[0], STM32_UUID[1], STM32_UUID[2]
 */
#define STM32_UUID ((uint32_t *)0x1FFF7A10)

#endif //__UUID_H

Here’s a simple example on how to read it:

#include "STM32-UID.h"

void foobar() {
    uint32_t idPart1 = STM32_UUID[0];
    uint32_t idPart2 = STM32_UUID[1];
    uint32_t idPart3 = STM32_UUID[2];
    //do something with the overall 96 bits
}