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Is CC2541 IEEE primary address guaranteed to be unique and unmodifiable?

Jack Chen4
Prodigy 110 points
Other Parts Discussed in Thread: CC2541

Hi,

I would like to use CC2541's IEEE primary address as an unique identifier of my product. I have three questions regarding that:

(1) Is every CC2541's IEEE primary address guaranteed to be unique?

(2) Is it possible to modify a CC2541's IEEE primary address? I know that the primary address is stored in flash at the location "0x780E-0x7813", so I am wondering if it is possible to use flash programmer to modify it?

(3) How can I force CC2541 to always use IEEE primary address? I know that if the IEEE secondary address is written to anything not FF FF FF FF FF FF, then CC2541 will use secondary address instead of primary address. How can I prevent that?

Regards,

Jack

  • 0
    TI__Mastermind 29650 points

    Hi Jack,

    1:
    TI has their own IEEE address range. It is using rolling addresses, meaning some day in the future an address might be re-used but for all practical uses they are unique.

    2:
    No, the info page is not writable, it is locked after production test in the factory.

    3:
    It is not possible to avoid this if you add a secondary address.

    Regards,
    Svend

  • 0 in reply to svendbt
    Prodigy 110 points

    Hi Svend,

    Thank you for the response.

    For question (3), I found a related thread:

    http://e2e.ti.com/support/low_power_rf/f/538/p/92300/680302.aspx#680302

    In the thread, a TI employee said:

    "New versions, have valid primary MAC addresses, and if BLE_BADDR_FROM_FLASH is not in the pre-processor list, then you will not be able to use the secondary address. "

    I wonder if that is only true for the older BLE stack? 

    Thank you very much.

     

    Regards,

    Jack

  • 0 in reply to Jack Chen4
    TI__Mastermind 23440 points

    Hi,

    In 1.4.0 at least, this define decides the order of preference between factory-set and secondary address placed in flash. With it defined, secondary is tried first, then factory-set.

    In any case, it will not make any difference whether you have this defined or not since this code resides in the library.

    BR,
    Aslak

  • 0 in reply to Aslak N.
    TI__Mastermind 29650 points

    If you need to set a secondary adress dynamically, you can also try doing this through the HCI Vendor specific interface with the command HCI_EXT_SetBDADDRCmd. 

    It is documented in Documents\TI_BLE_Vendor_Specific_HCI_Guide.pdf

    Regards,
    Svend