Create enum class for heating_status variable

Firmware/Marlin.h

@@ -275,6 +275,17 @@ FORCE_INLINE unsigned long millis_nc() {
 void setPwmFrequency(uint8_t pin, int val);
 #endif
 
+enum class HeatingStatus : uint8_t
+{
+    NO_HEATING = 0,
+    EXTRUDER_HEATING = 1,
+    EXTRUDER_HEATING_COMPLETE = 2,
+    BED_HEATING = 3,
+    BED_HEATING_COMPLETE = 4,
+};
+
+extern HeatingStatus heating_status;
+
 extern bool fans_check_enabled;
 extern float homing_feedrate[];
 extern uint8_t axis_relative_modes;
@@ -322,7 +333,6 @@ extern bool loading_flag;
 extern uint8_t usb_printing_counter;
 extern unsigned long total_filament_used;
 void save_statistics(unsigned long _total_filament_used, unsigned long _total_print_time);
-extern uint8_t heating_status;
 extern unsigned int status_number;
 extern uint8_t heating_status_counter;
 extern char snmm_filaments_used;

Firmware/Marlin_main.cpp

@@ -217,7 +217,7 @@ bool prusa_sd_card_upload = false;
 unsigned int status_number = 0;
 
 unsigned long total_filament_used;
-uint8_t heating_status;
+HeatingStatus heating_status;
 uint8_t heating_status_counter;
 bool loading_flag = false;
 
@@ -6676,7 +6676,7 @@ Sigma_Exit:
         break;
       }
       LCD_MESSAGERPGM(_T(MSG_HEATING));
-	  heating_status = 1;
+	  heating_status = HeatingStatus::EXTRUDER_HEATING;
 	  if (farm_mode) { prusa_statistics(1); };
 
 #ifdef AUTOTEMP
@@ -6710,7 +6710,7 @@ Sigma_Exit:
 
         LCD_MESSAGERPGM(_T(MSG_HEATING_COMPLETE));
 		KEEPALIVE_STATE(IN_HANDLER);
-		heating_status = 2;
+		heating_status = HeatingStatus::EXTRUDER_HEATING_COMPLETE;
 		if (farm_mode) { prusa_statistics(2); };
         
         //starttime=_millis();
@@ -6736,7 +6736,7 @@ Sigma_Exit:
     {
         bool CooldownNoWait = false;
         LCD_MESSAGERPGM(_T(MSG_BED_HEATING));
-		heating_status = 3;
+		heating_status = HeatingStatus::BED_HEATING;
 		if (farm_mode) { prusa_statistics(1); };
         if (code_seen('S')) 
 		{
@@ -6776,7 +6776,7 @@ Sigma_Exit:
         }
         LCD_MESSAGERPGM(_T(MSG_BED_DONE));
 		KEEPALIVE_STATE(IN_HANDLER);
-		heating_status = 4;
+		heating_status = HeatingStatus::BED_HEATING_COMPLETE;
 
         previous_millis_cmd.start();
     }
@@ -11798,9 +11798,9 @@ void restore_print_from_ram_and_continue(float e_move)
 	if (degTargetHotend(saved_active_extruder) != saved_extruder_temperature)
 	{
 		setTargetHotendSafe(saved_extruder_temperature, saved_active_extruder);
-		heating_status = 1;
+		heating_status = HeatingStatus::EXTRUDER_HEATING;
 		wait_for_heater(_millis(), saved_active_extruder);
-		heating_status = 2;
+		heating_status = HeatingStatus::EXTRUDER_HEATING_COMPLETE;
 	}
 	axis_relative_modes ^= (-saved_extruder_relative_mode ^ axis_relative_modes) & E_AXIS_MASK;
 	float e = saved_pos[E_AXIS] - e_move;

Firmware/temperature.cpp

@@ -615,7 +615,7 @@ void fanSpeedError(unsigned char _fan) {
 	if (get_message_level() != 0 && isPrintPaused) return;
 	//to ensure that target temp. is not set to zero in case that we are resuming print
 	if (card.sdprinting || is_usb_printing) {
-		if (heating_status != 0) {
+		if (heating_status != HeatingStatus::NO_HEATING) {
 			lcd_print_stop();
 		}
 		else {
@@ -625,7 +625,7 @@ void fanSpeedError(unsigned char _fan) {
 	else {
 		// SERIAL_PROTOCOLLNRPGM(MSG_OCTOPRINT_PAUSED); //Why pause octoprint? is_usb_printing would be true in that case, so there is no need for this.
 		setTargetHotend0(0);
-        heating_status = 0;
+        heating_status = HeatingStatus::NO_HEATING;
         fan_check_error = EFCE_REPORTED;
 	}
 	switch (_fan) {

Firmware/ultralcd.cpp

@@ -457,7 +457,7 @@ void lcdui_print_percent_done(void)
 	const char* src = is_usb_printing?_N("USB"):(IS_SD_PRINTING?_N(" SD"):_N("   "));
 	char per[4];
 	bool num = IS_SD_PRINTING || (PRINTER_ACTIVE && (print_percent_done_normal != PRINT_PERCENT_DONE_INIT));
-	if (!num || heating_status) // either not printing or heating
+	if (!num || heating_status != HeatingStatus::NO_HEATING) // either not printing or heating
 	{
 		const int8_t sheetNR = eeprom_read_byte(&(EEPROM_Sheets_base->active_sheet));
 		const int8_t nextSheet = eeprom_next_initialized_sheet(sheetNR);
@@ -574,7 +574,7 @@ void lcdui_print_time(void)
 //! @Brief Print status line on status screen
 void lcdui_print_status_line(void)
 {
-    if (heating_status) { // If heating flag, show progress of heating
+    if (heating_status != HeatingStatus::NO_HEATING) { // If heating flag, show progress of heating
         heating_status_counter++;
         if (heating_status_counter > 13) {
             heating_status_counter = 0;
@@ -586,20 +586,20 @@ void lcdui_print_status_line(void)
             lcd_putc_at(7 + dots, 3, '.');
         }
         switch (heating_status) {
-        case 1:
+        case HeatingStatus::EXTRUDER_HEATING:
             lcd_puts_at_P(0, 3, _T(MSG_HEATING));
             break;
-        case 2:
+        case HeatingStatus::EXTRUDER_HEATING_COMPLETE:
             lcd_puts_at_P(0, 3, _T(MSG_HEATING_COMPLETE));
-            heating_status = 0;
+            heating_status = HeatingStatus::NO_HEATING;
             heating_status_counter = 0;
             break;
-        case 3:
+        case HeatingStatus::BED_HEATING:
             lcd_puts_at_P(0, 3, _T(MSG_BED_HEATING));
             break;
-        case 4:
+        case HeatingStatus::BED_HEATING_COMPLETE:
             lcd_puts_at_P(0, 3, _T(MSG_BED_DONE));
-            heating_status = 0;
+            heating_status = HeatingStatus::NO_HEATING;
             heating_status_counter = 0;
             break;
         default: