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  • Case ID: 296771
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Using FICR device address with hci_uart example from NCS on nRF52x

OliverB

Hi,

is it possible to configure the hci_uart example from NCS in a way that the FICR device address of a nRF52840 is used as public device address? I cloned and compiled the project without any changes and would like the controller to use the hardware device address without providing a static random address from the host. 

Regards,
Oliver

  • +1

    Found a solution in the meantime:

    Using bt_ctlr_set_public_addr from bluetooth/controller.h I can set the public address:

    static void get_device_address(uint8_t mac_address[6]) {
  unsigned int device_addr_0 = NRF_FICR->DEVICEADDR[0];
  unsigned int device_addr_1 = NRF_FICR->DEVICEADDR[1];
  const uint8_t *part_0 = (const uint8_t *)(&device_addr_0);
  const uint8_t *part_1 = (const uint8_t *)(&device_addr_1);
  mac_address[0] = part_1[1];
  mac_address[1] = part_1[0];
  mac_address[2] = part_0[3];
  mac_address[3] = part_0[2];
  mac_address[4] = part_0[1];
  mac_address[5] = part_0[0];

  LOG_HEXDUMP_DBG(mac_address, 6, "Address");
}

void main(void) {
  ...

  uint8_t address[6];
  get_mac_address(address);
  bt_ctlr_set_public_addr(address);

  /* Enable the raw interface, this will in turn open the HCI driver */
  bt_enable_raw(&rx_queue);
  
  ...
}

    Thanks to  Retrieve BLE MAC address in Zephyr environment  for implementation of get_device_address().

  • 0

    Hi Oliver, 

    I was working on your case. Good to know that you found a solution.

    Here is how I solved it:

    We can use NRF_FICR structure to read device ID, and we can use bt_ctlr_set_public_addr() to set the address read.

        
    DA[0] = NRF_FICR->DEVICEID[0];
DA[1] = NRF_FICR->DEVICEID[1];
bt_ctlr_set_public_addr(DA);

    Thanks and regards,

    Naeem

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