Implement memory wear leveling algorithm

src/main.c

@@ -7,6 +7,7 @@
 #include <avr/interrupt.h>
 
 // TODO: Config header for chip specifics like EEPROM size.
+// TODO: Make sure wear leveling resets memory correctly.
 // TODO: Implement primary state machine for update loop.
 // TODO: Migrate to ATMega 1284P-PU for 2nd 16-bit timer.
 // TODO: Keep persistent TEMP and DEWP targets in EEPROM.
@@ -26,8 +27,8 @@ enum state_e
 };
 
 static enum state_e state;
-static float temp, temp_target;
-static float dewp, dewp_target;
+static word temp, temp_target;
+static word dewp, dewp_target;
 
 static int Init(void)
 {
@@ -67,6 +68,18 @@ static int Init(void)
 	WDT_Enable();
 	WDT_SetTimeoutFlag(WDT2000); // 2 seconds
 
+	// Test persistent settings from EEPROM. There must
+	// be some sanity checking before these values are
+	// used.
+
+	MEM_Init();
+	MEM_Read(&temp_target, &dewp_target);
+	Info("Persistent memory contains [%d, %d]",
+		temp_target, dewp_target);
+
+	// MEM_Write(20, 60);
+	// MEM_Dump();
+
 	// There is a possiblity to use interrupt signals
 	// for I2C communication but only as one large
 	// branching routine for the whole I2C system.