How to get the MCU unique ID for s32k344?

[AndrewXiong]

Hi All,

I know every MCU has an unique id for it. How can I get this unique id?

Thank you.

[Robin_Shen]

Hi AndrewXiong,

Here is the address of UID:0x1B000040

Best Regards,
Robin
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[AndrewXiong]

Hi,Robin,

I find this address, but when I try to do the following, the software crashes with a hard fault.

uint8 uid[8u];
C40_Ip_Read(FLS_UTEST_BLOCK_BASE_ADDR + 0x40,  sizeof(uid), uid);

What method should I  use to get the UID from this address?

Thansks.

[Robin_Shen · Accepted solution]

Some important system information is stored in UTEST and its OTP, so MPU is used by default to protect the area in any new RTD project to prevent unexpected data changes.

If you want access to UTEST, you need to disable the MPU, the simplest way to do it is to comment out the code in “Project_Settings/Startup_Code/system.c- SystemInit()”

[MateoSegura413]

For those wondering how to get this number, and still having the MPU enabled:

1. Declare an extern 64-bit integer in the System.c file mentioned in this post

2. Get the integer from memory right before enabling the MPU

Hope it helps

[AndrewXiong]

I get the UID, Thanks for your help!

[MateoSegura413]

Hello, we need to know how we can get this UID from user application though. When we try to do the following, the software crashes with a hard fault

And using the MCAL FLS driver, I also get a hardfault

Any guidance on how we could get the 8 bytes of the UID?

Also, does the device's MAC have a UID as well? If so, how can we get it?

Thanks in advance!