Pass variable structure as argument for memory functions

src/common/memory.h

@@ -1,13 +1,20 @@
 #ifndef MAD_CORE_COMMON_MEMORY_H
 #define MAD_CORE_COMMON_MEMORY_H
 
-#define M_TEMPERATURE  0
-#define M_DEWPOINT     1
+typedef struct mem_block_s mem_block_t;
+
+// Important: Must reset EEPROM memory when the size of
+// mem_block_s is changed. Also the flag value must be
+// kept at the first position of the struct.
+
+struct mem_block_s {
+	byte   flag;
+	float  temp, dewp;
+} __attribute__((packed));
 
 void  MEM_Init(void);
-void  MEM_Write(word temp, word dewp);
-void  MEM_Read(word *temp, word *dewp);
+void  MEM_Write(mem_block_t *in);
+int   MEM_Read(mem_block_t *out);
 void  MEM_Free(void);
-void  MEM_Dump(void);
 
 #endif // MAD_CORE_COMMON_MEMORY_H