STM32 unique ID reading method

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TM32 The microcontroller has a 96 Unique product identification of bit , In any case, it is unique and cannot be modified 96 Unique product identification of bit , It can be in bytes (8 position ) Read... For units , You can also use half a word (16 position ) Or whole word (32 position ) Read .

Want to read unique ID, You need to know its storage address , In different series MCU There are different addresses in , We checked some MCU And summarize it as follows ：

// Read FlashSize
 
uint16_t cpuGetFlashSize(void)
{
 
   return (**(volatile u16*)(0x1FFF7A22));
   // return (*(volatile u32*)(0x1FFF7A20))>>16;
}
 
// Read ChipID
 
void cpuidGetId(void)
{
    mcuID[0] = *(volatile u32*)(0x1FFF7A10);
    mcuID[1] = *(volatile u32*)(0x1FFF7A14);
    mcuID[2] = *(volatile u32*)(0x1FFF7A18);
}
 

      Send_data3 = ((CpuID[0]) >> 24)|0x00;
      Uart1Write(&Send_data3, 1);
                    
        Send_data3 = (CpuID[0] >> 16)|0x00;
      Uart1Write(&Send_data3, 1);
                    
      Send_data3 = (CpuID[0] >> 8)|0x00;
      Uart1Write(&Send_data3, 1);
        
      Send_data3 = (CpuID[0] )|0x00;
      Uart1Write(&Send_data3, 1);
    
      Send_data3 = ((CpuID[1]) >> 24)|0x00;
      Uart1Write(&Send_data3, 1);
                    
        Send_data3 = (CpuID[1] >> 16)|0x00;
      Uart1Write(&Send_data3, 1);
                    
      Send_data3 = (CpuID[1] >> 8)|0x00;
      Uart1Write(&Send_data3, 1);
        
      Send_data3 = (CpuID[1] )|0x00;
      Uart1Write(&Send_data3, 1);
        
        Send_data3 = ((CpuID[2]) >> 24)|0x00;
      Uart1Write(&Send_data3, 1);
                    
        Send_data3 = (CpuID[2] >> 16)|0x00;
      Uart1Write(&Send_data3, 1);
                    
      Send_data3 = (CpuID[2] >> 8)|0x00;
      Uart1Write(&Send_data3, 1);
        
      Send_data3 = (CpuID[2] )|0x00;
      Uart1Write(&Send_data3, 1);
 

Send to... Through serial port PC You can see .

Serial port sending program ;

printf("CPUID IS 0X%X %X %X.\r\n", mcuID[0], mcuID[1], mcuID[2] );   
printf("Flash size is %d KB\r\n",cpuGetFlashSize());

It can also be done through STLink Utility see

utilize STM32 Of ID Combine coding to encrypt products , The unique identity of the product is very suitable for ：
● Used as a serial number ( for example USB Character serial numbers or other terminal applications )
● Used as a password , When writing flash memory , Combine this unique ID with software encryption and decryption algorithm , Improve the security of code in flash memory .
● The bootstrap process used to activate the belt safety mechanism
96 The reference number provided by the product's unique identity is for any one STM32 Micro controller , In any case, it is unique . Under what circumstances do users , Can't modify this identity .
This 96 Unique product identification of bit , According to different usage of users , It can be in bytes (8 position ) Read... For units , You can also use half a word (16 position ) Or whole word (32 position ) Read .
Base address ：0x1FFF F7E8

Every CPU When leaving the factory
One of the configurations ID,96 Bit . This unique code can be used as software encryption .......

static u32 CpuID[3];
static u32 Lock_Code;

void GetLockCode(void)
{
 // obtain CPU only ID
 CpuID[0]=*(vu32*)(0x1ffff7e8);
 CpuID[1]=*(vu32*)(0x1ffff7ec);
 CpuID[2]=*(vu32*)(0x1ffff7f0);
 // encryption algorithm , A very simple encryption algorithm
 Lock_Code=(CpuID[0]>>1)+(CpuID[1]>>2)+(CpuID[2]>>3);
}

Example ：

　    STM32 Use CPUID encryption algorithm , A very simple encryption algorithm
Lock_Code=(CpuID[0]>>1)+(CpuID[1]>>2)+(CpuID[2]>>3);
　    CpuID[0]    CpuID[1]    CpuID[2]    Lock_Code    CpuID[0]>>1    CpuID[0]>>2    CpuID[0]>>3
1 Number CPU    0668FF30    3037564E    43023216    17A29B6D    3347F98    C0DD593    8604642
2 Number CPU    066AFF30    3037564E    43024449    17A39DB4    3357F98    C0DD593    8604889
3 Number CPU    066CFF30    3037564E    43021551    17A497D5    3367F98    C0DD593    86042AA
4 Number CPU    066BFF30    3037564E    43024716    17A41E0D    335FF98    C0DD593    86048E2
5 Number CPU    066CFF30    3037564E    43023851    17A49C35    3367F98    C0DD593    860470A
6 Number CPU    066DFF37    3235564E    43152737    1826FA14    336FF9B    C8D5593    862A4E6
 

Reference resources ：

https://blog.csdn.net/ybhuangfugui/article/details/52597133

https://blog.csdn.net/foxclever/article/details/80294516

https://www.cnblogs.com/zyqgold/p/3378993.html

http://www.openedv.com/posts/list/41972.htm
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