From ccb55e6e235d82260c79d004f322fc24dc0ed445 Mon Sep 17 00:00:00 2001
From: James Devine <devine.jd@gmail.com>
Date: Sun, 4 Dec 2016 17:59:45 +0100
Subject: [PATCH]

---
 DUEUniqueID | 57 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 57 insertions(+)
 create mode 100644 DUEUniqueID

diff --git a/DUEUniqueID b/DUEUniqueID
new file mode 100644
index 0000000..3341a79
--- /dev/null
+++ b/DUEUniqueID
@@ -0,0 +1,57 @@
+
+/* Code borrowed from http://forum.arduino.cc/index.php?topic=289190.0
+Awesome work Mark T!*/
+
+
+__attribute__ ((section (".ramfunc")))
+void _EEFC_ReadUniqueID( unsigned int * pdwUniqueID )
+{
+    unsigned int status ;
+ 
+    /* Send the Start Read unique Identifier command (STUI) by writing the Flash Command Register with the STUI command.*/
+    EFC1->EEFC_FCR = (0x5A << 24) | EFC_FCMD_STUI;
+    do
+    {
+        status = EFC1->EEFC_FSR ;
+    } while ( (status & EEFC_FSR_FRDY) == EEFC_FSR_FRDY ) ;
+
+    /* The Unique Identifier is located in the first 128 bits of the Flash memory mapping. So, at the address 0x400000-0x400003. */
+    pdwUniqueID[0] = *(uint32_t *)IFLASH1_ADDR;
+    pdwUniqueID[1] = *(uint32_t *)(IFLASH1_ADDR + 4);
+    pdwUniqueID[2] = *(uint32_t *)(IFLASH1_ADDR + 8);
+    pdwUniqueID[3] = *(uint32_t *)(IFLASH1_ADDR + 12);
+
+    /* To stop the Unique Identifier mode, the user needs to send the Stop Read unique Identifier
+       command (SPUI) by writing the Flash Command Register with the SPUI command. */
+    EFC1->EEFC_FCR = (0x5A << 24) | EFC_FCMD_SPUI ;
+
+    /* When the Stop read Unique Unique Identifier command (SPUI) has been performed, the
+       FRDY bit in the Flash Programming Status Register (EEFC_FSR) rises. */
+    do
+    {
+        status = EFC1->EEFC_FSR ;
+    } while ( (status & EEFC_FSR_FRDY) != EEFC_FSR_FRDY ) ;
+}
+
+void setup ()
+{
+    Serial.begin (9600) ;
+
+    unsigned int adwUniqueID[5] ;
+    WDT_Disable( WDT ) ;
+
+    Serial.println("Reading 128 bits unique identifier \n\r" ) ;
+    _EEFC_ReadUniqueID( adwUniqueID ) ;
+
+    Serial.print ("ID: ") ;
+    for (byte b = 0 ; b < 4 ; b++)
+      Serial.print ((unsigned int) adwUniqueID [b], HEX) ;
+    Serial.println () ;
+}
+
+
+
+void loop() {
+  // put your main code here, to run repeatedly:
+
+}
\ No newline at end of file