Add function to read 12byte HW RoT over STM32L4xx.

Author: soramame21

targets/TARGET_STM/TARGET_STM32L4/device/stm32l4xx_hal.c

@@ -403,6 +403,18 @@ uint32_t HAL_GetDEVID(void)
    return(DBGMCU->IDCODE & DBGMCU_IDCODE_DEV_ID);
 }
 
+/**
+  * @brief Return the unique device identifier (UID based on 96 bits)
+  * @param UID: pointer to 3 words array.
+  * @retval Device identifier
+  */
+void HAL_GetUID_12Byte(uint32_t *UID)
+{
+    UID[0] = (uint32_t)(READ_REG(*((uint32_t *)UID_BASE)));
+    UID[1] = (uint32_t)(READ_REG(*((uint32_t *)(UID_BASE + 4U))));
+    UID[2] = (uint32_t)(READ_REG(*((uint32_t *)(UID_BASE + 8U))));
+}
+
 /**
   * @brief  Return the first word of the unique device identifier (UID based on 96 bits)
   * @retval Device identifier

targets/TARGET_STM/TARGET_STM32L4/device/stm32l4xx_hal.h

@@ -582,6 +582,7 @@ void HAL_ResumeTick(void);
 uint32_t HAL_GetHalVersion(void);
 uint32_t HAL_GetREVID(void);
 uint32_t HAL_GetDEVID(void);
+void HAL_GetUID_12Byte(uint32_t *UID);
 uint32_t HAL_GetUIDw0(void);
 uint32_t HAL_GetUIDw1(void);
 uint32_t HAL_GetUIDw2(void);