sudhakar thangavel

Important changes to forums and questions

All forums and questions are now archived. To start a new conversation or read the latest updates go to forums.mbed.com.

7 years, 6 months ago.

96- bit Unique ID

I am using STM32F429ZIT6 development board. In data sheet for STM32 there a unique ID and the ID length have 96 -bit mentioned in features of the STM controller. I am using three STM32 controllers. So How can I get the Device ID of each controller? In future can I use that 96-bit ID for Identification of controller or track the controller using the program is possible or not.

2 Answers

Stefan Staub
7 years, 6 months ago.

Try following function, UID_BASE is the start address of the unique ID and is different for each type. You need following variable declaration for the UID 

uint8_t uid[12]; 


void stm32UID(uint8_t uid[]) {
  for(uint8_t i = 0; i < 12; i++) {
    uid[i] = *(volatile uint8_t *)(UID_BASE + i);
    }
  }

Mark Peter Vargha
7 years, 6 months ago.

You should check the addresses of the ID in the microcontroller's datasheet. Here are a few examples.

#if defined TARGET_NUCLEO_F103RB
    #define USE_ID_ADDRESS ID_ADDRESS_STM32F1XXX
#elif defined TARGET_NUCLEO_F411RE || defined TARGET_ARCH_MAX || defined TARGET_DISCO_F429ZI
    #define USE_ID_ADDRESS ID_ADDRESS_STM32F4XXX
#elif defined TARGET_NUCLEO_L053R8
    #define USE_ID_ADDRESS ID_ADDRESS_STM32F0XXX
#else
    #define USE_ID_ADDRESS 0
#endif

#define getUniqueId8(x)     ((x >= 0 && x < 12) ? (*(uint8_t *)  (USE_ID_ADDRESS + (x))) : 0)
#define getUniqueId16(x)    ((x >= 0 && x <  6) ? (*(uint16_t *) (USE_ID_ADDRESS + 2 * (x))) : 0)
#define getUniqueId32(x)    ((x >= 0 && x <  3) ? (*(uint32_t *) (USE_ID_ADDRESS + 4 * (x))) : 0)