cpu/nrf51822: added driver to get CPUID

cpu/nrf51822/include/cpu-conf.h

@@ -49,5 +49,10 @@
 #endif
 /** @} */
 
+/**
+ * @name Length in bytes for reading CPU_ID
+ */
+#define CPUID_ID_LEN                    (8)
+
 #endif /* __CPU_CONF_H */
 /** @} */

cpu/nrf51822/periph/cpuid.c

@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) 2014 Freie Universität Berlin
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser General
+ * Public License v2.1. See the file LICENSE in the top level directory for more
+ * details.
+ */
+
+/**
+ * @ingroup     cpu_nrf51822
+ * @{
+ *
+ * @file
+ * @brief       CPU-ID driver implementation
+ *
+ * The NRF51822 provides a 64-bit unique identifier, that is unique for each shipped unit.
+ *
+ * @author      Hauke Petersen <hauke.petersen@fu-berlin.de>
+ *
+ * @}
+ */
+
+#include <string.h>
+
+#include "cpu.h"
+#include "cpu-conf.h"
+#include "periph/cpuid.h"
+
+void cpuid_get(void *id)
+{
+    memcpy(id, (void*)NRF_FICR->DEVICEID, CPUID_ID_LEN);
+}