Add at_address() to etl::unaligned_type

include/etl/unaligned_type.h

@@ -729,6 +729,28 @@ namespace etl
         }
       }
     };
+
+    //*******************************************
+    /// at_address
+    ///\brief Helps to reinterprete memory as unaligned_type. Overload for write access.
+    ///\tparam address   Pointer to memory to be reinterpreted.
+    ///\return Reference to unaligned_type object at location specified by address
+    //*******************************************
+    static unaligned_type<T, Endian_>& at_address(void* address)
+    {
+      return *reinterpret_cast<unaligned_type<T, Endian_>*>(address);
+    }
+
+    //*******************************************
+    /// at_address
+    ///\brief Helps to reinterprete memory as unaligned_type. Overload for read only access to const memory.
+    ///\tparam address   Pointer to memory to be reinterpreted.
+    ///\return Reference to unaligned_type object at location specified by address
+    //*******************************************
+    static const unaligned_type<T, Endian_>& at_address(const void* address)
+    {
+      return *reinterpret_cast<const unaligned_type<T, Endian_>*>(address);
+    }
   };
 
   template <typename T, int Endian_>

test/test_unaligned_type.cpp

@@ -981,6 +981,26 @@ namespace
       CHECK_EQUAL(0x12, bev0);
       CHECK_EQUAL(0x34, bev1);
     }
+
+    //*************************************************************************
+    TEST(test_at_address)
+    {
+      uint8_t data[] = {0x01, 0x02, 0x03, 0x04};
+
+      CHECK_EQUAL(etl::be_uint32_t::at_address(data), 0x01020304);
+      CHECK_EQUAL(etl::le_uint32_t::at_address(data), 0x04030201);
+
+      etl::be_uint32_t::at_address(data) = 0x12345678;
+      CHECK_EQUAL(etl::le_uint32_t::at_address(data), 0x78563412);
+    }
+
+    TEST(test_const_at_address)
+    {
+      const uint8_t data[] = {0x01, 0x02, 0x03, 0x04};
+
+      CHECK_EQUAL(etl::be_uint32_t::at_address(data), 0x01020304);
+      CHECK_EQUAL(etl::le_uint32_t::at_address(data), 0x04030201);
+    }
   };
 }