NRF52832 serial number

RE: NRF52832 serial number

hmolesworth — Tue, 02 Jun 2020 15:37:54 GMT

The Rigado BMD-350 prints the MAC address on the module, but this can be lost if the chip is erased without first reading the value (although it can be recreated). You might find my notes helpful:

/**@note
 *
 * Rigado has defined a MAC address stored within NRF_UICR, which matches the address inscribed on
 * the module. The Nordic examples (eg uart on which the pump is based)
 * use the Device Id in NRF_FICR to form a MAC address, which is different and fixed
 *
 * The 6-byte BLE Rigado MAC address is stored in the nRF52832 UICR at NRF_UICR_BASE+0x80 LSB first.
 * address during programming. Modules with factory firmware AA and AB are provided
 * with full memory protection enabled, not allowing the UICR to be read via the SWD interface. If
 * performing a full-erase, the MAC can then only be recovered from the 2D barcode and humanreadable text.
 * Modules with factory firmware code AC and later no longer enable read-back
 * protection from the factory, allowing the MAC address to be read with an SWD programmer.
 *
 * UICR Register (94:54:93:XX:YY:ZZ) see BMD-350 Data Sheet v2.0:
 * NRF_UICR + 0x80 (0x10001080): MAC_Addr [0] (0xZZ)
 * NRF_UICR + 0x81 (0x10001081): MAC_Addr [1] (0xYY)
 * NRF_UICR + 0x82 (0x10001082): MAC_Addr [2] (0xXX)
 * NRF_UICR + 0x83 (0x10001083): MAC_Addr [3] (0x93)
 * NRF_UICR + 0x84 (0x10001084): MAC_Addr [4] (0x54)
 * NRF_UICR + 0x85 (0x10001085): MAC_Addr [5] (0x94)
 *
 * Nordic MAC Address
 * ==================
 * DA:88:19:2D:84:27 from DE5FDA88192D8427
 *
 * Last 2 bits in 48-bit stream - top 2 bits in last byte of Device Address
 * 00 Public
 * 01 Static
 * 10 Resolvable
 * 11 Non-Resolvable
 *
 * Note that even though the address is "Random", it is invariant and never changes
 * for a specific Nordic device as the NRF_FICR->DEVICEADDR registers are Read-Only
 */

RE: NRF52832 serial number

cyrine — Tue, 02 Jun 2020 09:52:32 GMT

Thank you that answers my questions

RE: NRF52832 serial number

Hung Bui — Fri, 29 May 2020 13:20:27 GMT

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

RE: NRF52832 serial number

cyrine — Fri, 29 May 2020 11:32:25 GMT

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[ ] ?

RE: NRF52832 serial number

Hung Bui — Fri, 29 May 2020 10:56:27 GMT

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.

RE: NRF52832 serial number

awneil — Fri, 29 May 2020 08:32:26 GMT

The Device ID is not unique:

devzone.nordicsemi.com/.../198087