How to get 6 byte mac address at nrf51822

RE: How to get 6 byte mac address at nrf51822

mikeg78 — Mon, 01 Jul 2019 03:21:21 GMT

So to confirm - the addresses are randomly selected but unique to any given nordic nRF chip? So your production will check for uniqueness and assign a new random number should a new selected address already exist. The reason I am confirming is that we need to rely on a unique identifier for our own production. Thanks

RE: How to get 6 byte mac address at nrf51822

Jakub — Wed, 18 Apr 2018 10:00:01 GMT

What is the smallest part of MAC address that can be used as a unique ID of a certain device?

I know that first 3 bytes are vendor-specific (Nordic) so another 3 bytes are unique across Nordic products. But are they totally random, or is there any pattern that can allow us to use only 2 bytes for a specific product (nRF51822)?

- - - -
Disclaimer: I know this is an old thread, but frequently shows up in Google and that's why I decided to include my question here.

RE: How to get 6 byte mac address at nrf51822

Nero — Thu, 22 Mar 2018 15:20:52 GMT

Hello ,

I want to display the 6 byte mac address of mycustom card by uart (I already configured uart), i want to know how I can use the registers NRF_FICR-> DEVICEADDR [0] and NRF_FICR-> DEVICEADDR [1] to achieve my objective.(if there are any example of that )

thanks

RE: How to get 6 byte mac address at nrf51822

CeDeROM — Tue, 20 Feb 2018 00:37:59 GMT

Here IEEE SA RA provides a guide on MAC organization and assignment for production devices:

standards.ieee.org/.../eui.pdf

RE: How to get 6 byte mac address at nrf51822

CeDeROM — Mon, 19 Feb 2018 21:20:51 GMT

So numbers are random but not legitimate IEEE RA registered?

Chips will work for testing but for production I need to buy my own MAC address space?

RE: How to get 6 byte mac address at nrf51822

Artem Zemlyanukhin — Fri, 09 Jun 2017 10:22:57 GMT

Håkon, thank you for response!

RE: How to get 6 byte mac address at nrf51822

Håkon Alseth — Fri, 09 Jun 2017 06:59:44 GMT

The BLE address we provide is a random static address, which means that it is random generated. This does not use any vendor name. The high order of randomness (46 bits are random) in this type of address does not provide 100 % security wrt. two devices having the same address, but the probability is quite low.

RE: How to get 6 byte mac address at nrf51822

Artem Zemlyanukhin — Thu, 08 Jun 2017 15:30:02 GMT

Hi,

Can Nordic MAC address be the same as MAC address of BLE Soc made by another Vendor? As I understand, your MAC address is not an unique address where the first 3 bytes mean Vendor name (www.coffer.com/.../).

RE: How to get 6 byte mac address at nrf51822

uly — Wed, 19 Oct 2016 12:08:31 GMT

You can also use nrfgo studio, run a BLE relevant example (e.g. ble_app_proximity), programming the ble_app_proximity.hex file. Then use your phone (bluetooth enabled) to find the device.

RE: How to get 6 byte mac address at nrf51822

Jacksonlv — Thu, 08 Oct 2015 07:46:22 GMT

I use the code below but I got the mac address is different from I set .What's more,I find it is constant.

ble_gap_addr_t m_address_1;
m_address_1.addr_type = BLE_GAP_ADDR_TYPE_RANDOM_PRIVATE_NON_RESOLVABLE;
for(uint8_t i = 0;i<2;i++)
{
   m_address_1.addr[i] = 0xAAAAAAAA;
}
sd_ble_gap_address_set(BLE_GAP_ADDR_CYCLE_MODE_NONE, &m_address_1);
while(1)
{      
        for(uint8_t i = 0;i<2;i++)
        {
          Serial.println(NRF_FICR->DEVICEID[i]);
        }
        delay(1000);
}

RE: How to get 6 byte mac address at nrf51822

Håkon Alseth — Wed, 07 Oct 2015 08:42:08 GMT

Hi Jackson,

You can only change the MAC on your local device. To change it on a peer-device, you will need to implement a "hook" (or a ble service) to do this.

Cheers, Håkon

RE: How to get 6 byte mac address at nrf51822

Jacksonlv — Wed, 07 Oct 2015 08:37:05 GMT

Can I change the mac address by some APPs or some upper monitor?

RE: How to get 6 byte mac address at nrf51822

Lee YongKwan — Thu, 10 Apr 2014 06:55:55 GMT

Thanks for your help. I succecced it.

char strDeviceName[20]; void device_name_set(void) { int no; no = NRF_FICR->DEVICEADDR0%100000; sprintf(&strDeviceName[0], "%s%05d\0", &DEVICE_NAME[0], no);

}

static void gap_params_init(void) { ... device_name_set(); err_code = sd_ble_gap_device_name_set(&sec_mode, (uint8_t *) strDeviceName, strlen(strDeviceName)); ... }

Good day.

RE: How to get 6 byte mac address at nrf51822

Håkon Alseth — Tue, 08 Apr 2014 11:13:55 GMT

By default, the BLE address is derived from the NRF_FICR->DEVICEADDR[] and is of 48 bits length (6 bytes). This registers are randomly generated in our production, and they are unique for each device (2^46 different combinations, due to MSbits set to '11').

You can read out the address using the API call, "sd_ble_gap_address_get(..);" or reading the FICR->DEVICEADDR[x] registers.

Example: My device advertises with "0xE724 08C78790"

DEVICEADDR[0] = 0x08C78790 DEVICEADDR[1] = 0xYYYYA724

The reason why "A7" becomes "E7" is because the specification says that the 2 MSBit of the address must be set '11' (if you're very interested, see Bluetooth Core v4.0, Vol 3, Part C, chapter 10.8.1.)

BR Håkon