Added CPU UID target implementation for STM32 devices

Author: MikeDK

targets/TARGET_STM/cpu_uid_api.c

@@ -0,0 +1,85 @@
+/* mbed Microcontroller Library
+ *******************************************************************************
+ * Copyright (c) 2017, STMicroelectronics
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. Neither the name of STMicroelectronics nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *******************************************************************************
+ */
+#include "device.h"
+
+#if DEVICE_CPUUID
+
+#if defined(TARGET_STM32F0)
+#include "stm32f0xx_ll_utils.h"
+#elif defined(TARGET_STM32F1)
+#include "stm32f1xx_ll_utils.h"
+#elif defined(TARGET_STM32F2)
+#include "stm32f2xx_ll_utils.h"
+#elif defined(TARGET_STM32F3)
+#include "stm32f3xx_ll_utils.h"
+#elif defined(TARGET_STM32F4)
+#include "stm32f4xx_ll_utils.h"
+#elif defined(TARGET_STM32F7)
+#include "stm32f7xx_ll_utils.h"
+#elif defined(TARGET_STM32L0)
+#include "stm32l0xx_ll_utils.h"
+#elif defined(TARGET_STM32L1)
+#include "stm32l1xx_ll_utils.h"
+#elif defined(TARGET_STM32L4)
+#include "stm32l4xx_ll_utils.h"
+#else
+#error "Unsupported STM32 device!"
+#endif
+#include "cpu_uid_api.h"
+
+#define UID_LENGTH      12
+#define UID_WORDS       3
+
+
+int cpu_uid_get_length(void)
+{
+    return UID_LENGTH;
+}
+
+void cpu_uid_get_uid(uint8_t *uid)
+{
+    uint32_t uid_buf[UID_WORDS];
+    int pos = 0;
+
+    uid_buf[0] = LL_GetUID_Word0();
+    uid_buf[1] = LL_GetUID_Word1();
+    uid_buf[2] = LL_GetUID_Word2();
+    
+    for (int i = (UID_WORDS-1); i >= 0; --i)
+    {
+        for (int j = 3; j >= 0; --j)
+        {
+            uid[pos] = (uint8_t)((uid_buf[i] >> (j*8)) & 0xFF);
+            ++pos;
+        }
+    }
+}
+
+#endif