Persist display intensity to EEPROM

Display.h

@@ -134,6 +134,8 @@ bool display_init() {
       disp_area.cp437(true);
       display.cp437(true);
 
+      display_intensity = EEPROM.read(eeprom_addr(ADDR_CONF_DINT));
+
       return true;
     }
   #else

RNode_Firmware.ino

@@ -117,6 +117,10 @@ void setup() {
   #endif
 
   #if HAS_DISPLAY
+    if (EEPROM.read(eeprom_addr(ADDR_CONF_DSET)) != CONF_OK_BYTE) {
+      eeprom_update(eeprom_addr(ADDR_CONF_DSET), CONF_OK_BYTE);
+      eeprom_update(eeprom_addr(ADDR_CONF_DINT), 0xFF);
+    }
     disp_ready = display_init();
     update_display();
   #endif
@@ -798,6 +802,7 @@ void serialCallback(uint8_t sbyte) {
                 ESCAPE = false;
             }
             display_intensity = sbyte;
+            di_conf_save(display_intensity);
         }
 
       #endif

ROM.h

@@ -58,6 +58,8 @@
 	#define ADDR_CONF_OK   0xA7
 	
 	#define ADDR_CONF_BT   0xB0
+	#define ADDR_CONF_DSET 0xB1
+	#define ADDR_CONF_DINT 0xB2
 
 	#define INFO_LOCK_BYTE 0x73
 	#define CONF_OK_BYTE   0x73

Utilities.h

@@ -1096,6 +1096,10 @@ void bt_conf_save(bool is_enabled) {
 	}
 }
 
+void di_conf_save(uint8_t dint) {
+	eeprom_update(eeprom_addr(ADDR_CONF_DINT), dint);
+}
+
 bool eeprom_have_conf() {
 	if (EEPROM.read(eeprom_addr(ADDR_CONF_OK)) == CONF_OK_BYTE) {
 		return true;