Added HAL API for retrieving the CPU UID

Author: MikeDK

hal/cpu_uid_api.h

@@ -0,0 +1,61 @@
+/** \addtogroup hal */
+/** @{*/
+/* mbed Microcontroller Library
+ * Copyright (c) 2017 ARM Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#ifndef MBED_CPU_UID_API_H
+#define MBED_CPU_UID_API_H
+
+#include <stddef.h>
+#include "device.h"
+
+#if DEVICE_CPUUID
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \defgroup hal_cpu_uid CPUUID hal functions
+ * @{
+ */
+
+
+/** Get length of CPU UID in bytes
+ * 
+ * @return Number of uid bytes
+ * 
+ * @note Shall be used to get the needed size of the byte buffer
+ */
+int cpu_uid_get_length(void);
+
+/** Get CPU UID data bytes
+ * 
+ * @param uid Byte buffer for uid. Must at least be of size obtained by call to cpu_uid_get_length()
+ *
+ */
+void cpu_uid_get_uid(uint8_t *uid);
+
+
+/**@}*/
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+
+#endif
+/** @}*/