Add support for Nordic Semiconductor nRF5 based boards

This patch is in-sync with the patch at ricaun/ArduinoUniqueID#30,
which adds support for getting unique ID for Nordic Semiconductor
nRF5 based boards, including the BBC Micro:bit.

Signed-off-by: Ricky Cheung <rcheung844@gmail.com>

Author: Ricky Cheung

Arduino_Code/uniqueID.cpp

@@ -183,6 +183,16 @@ ArduinoUniqueID::ArduinoUniqueID()
   id[7] = SIGROW.SERNUM7;
   id[8] = SIGROW.SERNUM8;
   id[9] = SIGROW.SERNUM9;
+#elif defined(NRF51_SERIES) || defined(NRF52_SERIES) || defined(NRF53_SERIES)
+  NRF_FICR_Type ficr = *NRF_FICR;
+  id[0] = ficr.DEVICEID[0] >> 24;
+  id[1] = ficr.DEVICEID[0] >> 16;
+  id[2] = ficr.DEVICEID[0] >> 8;
+  id[3] = ficr.DEVICEID[0];
+  id[4] = ficr.DEVICEID[1] >> 24;
+  id[5] = ficr.DEVICEID[1] >> 16;
+  id[6] = ficr.DEVICEID[1] >> 8;
+  id[7] = ficr.DEVICEID[1];
 #endif
 }
 

Arduino_Code/uniqueID.h

@@ -22,8 +22,9 @@
 #elif defined(ARDUINO_ARCH_MBED_RP2040) || defined(ARDUINO_ARCH_RP2040)
 //#include <pico/unique_id.h>
 #elif defined(ARDUINO_ARCH_MEGAAVR)
+#elif defined(NRF51_SERIES) || defined(NRF52_SERIES) || defined(NRF53_SERIES)
 #else
-#error "ArduinoUniqueID only works on AVR, SAM, SAMD, STM32, Teensy, megaAVR and ESP Architecture"
+#error "ArduinoUniqueID only works on AVR, SAM, SAMD, STM32, Teensy, megaAVR, nRF5 and ESP Architecture"
 #endif
 
 #if defined(ARDUINO_ARCH_AVR)
@@ -63,6 +64,9 @@
 #elif defined(ARDUINO_ARCH_MEGAAVR)
 #define UniqueIDsize 10
 #define UniqueIDbuffer 10
+#elif defined(NRF51_SERIES) || defined(NRF52_SERIES) || defined(NRF53_SERIES)
+#define UniqueIDsize 8
+#define UniqueIDbuffer 8
 #endif
 
 #define UniqueID8 (_UniqueID.id + UniqueIDbuffer - 8)