RE: Using FICR device address with hci_uart example from NCS on nRF52x

Naeem Maroof — Thu, 13 Oct 2022 16:36:16 GMT

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

RE: Using FICR device address with hci_uart example from NCS on nRF52x

OliverB — Thu, 13 Oct 2022 16:22:58 GMT

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().