MAC ADDRESS AUTOMATICALLY CHANGE

[trananh]

Hi all,

In my application, I take mac address of chip and make major, minor value (device 's ID) and I need mac address is a constant value. As I know, mac address is a unique value for each chip but on my test it always change. Can you tell me what problem here ?

For example: The first time I turn on device, mac address is ca676b42db50. The 2nd time I turn on device, mac address is eb84ffada44a. .......... Something like that, it always change

Thanks and regard Anh Pham

[trananh]

@HungBui

Can you help me this problem?

Thanks

[Petter Myhre]

Hung is travelling right now. Are you using a custom board or one of our development kits?

[trananh]

@Petter

I 'm using a custom board

[Petter Myhre]

The BLE address should be static. It is fetched from FICR->DEVICEADDR[x], which is programmed in production. Please see this for more information. If the SoftDevice is unable to get an address from FICR it will generate one randomly. This will stored persistently, and will change between resets. Have you modified FICR in your chips?

[trananh]

No, I don't change anything. Moreover, I have many device but this situation happen in only 1 device so how do you think? Is it hardware problem?

And what do you mean about "the SoftDevice is unable to get an address from FICR"? Something wrong in SoftDevice?