diff --git a/SerialArduino.cpp b/SerialArduino.cpp
index db49759..c146ae7 100644
--- a/SerialArduino.cpp
+++ b/SerialArduino.cpp
@@ -26,8 +26,29 @@
 
 #elif defined(__SAM3X8E__) || defined(__MK20DX256__) || defined(__MK64FX512__) || defined(__MK66FX1M0__)
 
+
+#if defined(__SAM3X8E__)
+extern "C" {
+  #include <stdio.h>
+}
+
+extern char UDID[];
+
+#define FLASH_ACCESS_MODE_128     0
+#define EFC0                      (0x400E0A00U)
+#define EFC                       ((Efc*)EFC0)
+
+#endif
+
 void CSerialPort::beginInt(uint8_t n, int speed)
 {
+#if defined(__SAM3X8E__)
+  uint32_t _id[4];
+  if (0 == efc_init(EFC, FLASH_ACCESS_MODE_128, 4))
+    if (0 == efc_perform_read_sequence(EFC, EFC_FCMD_STUI, EFC_FCMD_SPUI, _id, 4))
+      ::sprintf(UDID,"%08X%08X%08X%08X",_id[0],_id[1],_id[2],_id[3]);
+#endif
+
   switch (n) {
     case 1U:
       Serial.begin(speed);