How to get 6 byte mac address at nrf51822

[Lee YongKwan]

When I scan BLE device at nRF UARTv2.0 App in Android4.4, it is appar device name(Ex:Nordic_UART) and 6 byte device address(MAC address?). I want to include mac address in device name. How to get 6 byte mac address at nrf51822?

[Håkon Alseth]

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

[Jacksonlv]

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);
}