nimble/phy/nrf: Add support for reading Ublox BMD-345 public address

The BMD-345 modules are preprogrammed from the factory with a unique
public Bluetooth device address stored in the CUSTOMER[0] and
CUSTOMER[1] registers of the User Information Configuration Registers
(UICR).

Author: sjanc

nimble/drivers/nrf52/src/ble_hw.c

@@ -69,6 +69,22 @@ ble_hw_get_public_addr(ble_addr_t *addr)
     uint32_t addr_high;
     uint32_t addr_low;
 
+#if MYNEWT_VAL(BLE_PHY_UBLOX_BMD345_PUBLIC_ADDR)
+    /*
+    * The BMD-345 modules are preprogrammed from the factory with a unique public
+    * The  Bluetooth device address stored in the CUSTOMER[0] and CUSTOMER[1]
+    * registers of the User Information Configuration Registers (UICR).
+    * The Bluetooth device address consists of the IEEE Organizationally Unique
+    * Identifier (OUI) combined with the hexadecimal digits that are printed on
+    * a 2D barcode and in human-readable text on the module label.The Bluetooth
+    * device address is stored in little endian format. The most significant
+    * bytes of the CUSTOMER[1] register are 0xFF to complete the 32-bit register.
+    */
+
+    /* Copy into device address. We can do this because we know platform */
+    addr_low = NRF_UICR->CUSTOMER[0];
+    addr_high = NRF_UICR->CUSTOMER[1];
+#else
     /* Does FICR have a public address */
     if ((NRF_FICR->DEVICEADDRTYPE & 1) != 0) {
         return -1;
@@ -77,6 +93,8 @@ ble_hw_get_public_addr(ble_addr_t *addr)
     /* Copy into device address. We can do this because we know platform */
     addr_low = NRF_FICR->DEVICEADDR[0];
     addr_high = NRF_FICR->DEVICEADDR[1];
+#endif
+
     memcpy(addr->val, &addr_low, 4);
     memcpy(&addr->val[4], &addr_high, 2);
     addr->type = BLE_ADDR_PUBLIC;

nimble/drivers/nrf52/syscfg.yml

@@ -63,3 +63,10 @@ syscfg.defs:
             - nRF52840 Engineering C
             - nRF52840 Rev 1 (final silicon)
         value: 1
+
+    BLE_PHY_UBLOX_BMD345_PUBLIC_ADDR:
+        description: >
+            Ublox BMD-345 modules come with public address preprogrammed
+            in UICR register. If enabled public address will be read from
+            custom UICR instead of FICR register.
+        value: 0