NRF52832 serial number

[cyrine]

Hello,  I am working on the BMD-300 Series Evaluation Kit with nrf52832 microcontroller and I tried accessing the serial number of my nrf52832, with these functions:

 m_device_id1 = NRF_FICR->DEVICEID[0];

 m_device_id2 = NRF_FICR->DEVICEID[1];

the probleme is m_device_id1m_device_id2 is different from the serial number printed on the microcontroller.

Are the device_id and serial number not the same thing and if they aren't wich one is a unique number that I can use in my code.

Thank you.

[Hung Bui]

Hi Cyrine, 

As mentioned by Andrew Neil, the device ID is not Unique but there are 18446744073709551616  possibilities and  the chance that you have 2 device with same device ID is pretty small. 
The serial number on top of the chip only contain the chip ID, variant, build code and the week and year the chip manufactured, it's not unique at all. 

[cyrine]

Thank you for response. But just to be sure, the 64 bits device ID found in the FICR (DEVICEID[1]DEVICEID[0]) register is not the same as the numbers printed on top of my chip.

If it is the case, is it possible to obtein in a programme the numbers printed on the chip? And if I want to use a more likely unique number, I shoul go with DEVICEID[ ] ?

[Hung Bui]

No it's not possible to get the number printed on the chip from the code. Please use the DEVICEID[] instead.