Refactor

Remove variable CrashDetectMenu. Read this state from EEPROM_CRASH_DET instead in bool lcd_crash_detect_enabled().
Rename crashdet_enable() to lcd_crash_detect_enable() and move it to ultralcd.cpp.
Rename crashdet_disable() to lcd_crash_detect_disable() and move it to ultralcd.cpp.
Rename lcd_crash_mode_set() to crash_mode_switch().
Remove forward function declarations from *.cpp file.

Saves 34B of FLASH and 2B of RAM.

Firmware/Marlin_main.cpp

@@ -524,24 +524,6 @@ bool fans_check_enabled = true;
 
 #ifdef TMC2130
 
-extern int8_t CrashDetectMenu;
-
-void crashdet_enable()
-{
-	tmc2130_sg_stop_on_crash = true;
-	eeprom_update_byte((uint8_t*)EEPROM_CRASH_DET, 0xFF); 
-	CrashDetectMenu = 1;
-
-}
-
-void crashdet_disable()
-{
-	tmc2130_sg_stop_on_crash = false;
-	tmc2130_sg_crash = 0;
-	eeprom_update_byte((uint8_t*)EEPROM_CRASH_DET, 0x00); 
-	CrashDetectMenu = 0;
-}
-
 void crashdet_stop_and_save_print()
 {
 	stop_and_save_print_to_ram(10, -default_retraction); //XY - no change, Z 10mm up, E -1mm retract
@@ -1262,15 +1244,15 @@ void setup()
 	uint8_t silentMode = eeprom_read_byte((uint8_t*)EEPROM_SILENT);
 	if (silentMode == 0xff) silentMode = 0;
 	tmc2130_mode = TMC2130_MODE_NORMAL;
-	uint8_t crashdet = eeprom_read_byte((uint8_t*)EEPROM_CRASH_DET);
-	if (crashdet && !farm_mode)
+
+	if (lcd_crash_detect_enabled() && !farm_mode)
 	{
-		crashdet_enable();
+		lcd_crash_detect_enable();
 	    puts_P(_N("CrashDetect ENABLED!"));
 	}
 	else
 	{
-		crashdet_disable();
+	    lcd_crash_detect_disable();
 	    puts_P(_N("CrashDetect DISABLED"));
 	}
 

Firmware/ultralcd.cpp

@@ -58,17 +58,9 @@ uint8_t SilentModeMenu_MMU = 1; //activate mmu unit stealth mode
 
 int8_t FSensorStateMenu = 1;
 
-int8_t CrashDetectMenu = 1;
-
-
 extern bool fsensor_enable();
 extern void fsensor_disable();
 
-#ifdef TMC2130
-extern void crashdet_enable();
-extern void crashdet_disable();
-#endif //TMC2130
-
 
 #ifdef SDCARD_SORT_ALPHA
 bool presort_flag = false;
@@ -4448,24 +4440,25 @@ static void lcd_silent_mode_set() {
 #endif //TMC2130
   st_current_init();
 #ifdef TMC2130
-  if (CrashDetectMenu && (SilentModeMenu != SILENT_MODE_NORMAL))
+  if (lcd_crash_detect_enabled() && (SilentModeMenu != SILENT_MODE_NORMAL))
 	  menu_submenu(lcd_crash_mode_info2);
   lcd_encoder_diff=0;                             // reset 'encoder buffer'
 #endif //TMC2130
 }
 
 #ifdef TMC2130
-static void lcd_crash_mode_set()
+static void crash_mode_switch()
 {
-	CrashDetectMenu = !CrashDetectMenu; //set also from crashdet_enable() and crashdet_disable()
-    if (CrashDetectMenu==0) {
-        crashdet_disable();
-    }else{
-        crashdet_enable();
+    if (lcd_crash_detect_enabled())
+    {
+        lcd_crash_detect_disable();
+    }
+    else
+    {
+        lcd_crash_detect_enable();
     }
 	if (IS_SD_PRINTING || is_usb_printing || (lcd_commands_type == LcdCommands::Layer1Cal)) menu_goto(lcd_tune_menu, 9, true, true);
 	else menu_goto(lcd_settings_menu, 9, true, true);
-    
 }
 #endif //TMC2130
  
@@ -5179,11 +5172,11 @@ do\
         else MENU_ITEM_FUNCTION_P(_T(MSG_STEALTH_MODE_ON), lcd_silent_mode_set);\
         if (SilentModeMenu == SILENT_MODE_NORMAL)\
         {\
-            if (CrashDetectMenu == 0)\
+            if (lcd_crash_detect_enabled())\
             {\
-                MENU_ITEM_FUNCTION_P(_T(MSG_CRASHDETECT_OFF), lcd_crash_mode_set);\
+                MENU_ITEM_FUNCTION_P(_T(MSG_CRASHDETECT_ON), crash_mode_switch);\
             }\
-            else MENU_ITEM_FUNCTION_P(_T(MSG_CRASHDETECT_ON), lcd_crash_mode_set);\
+            else MENU_ITEM_FUNCTION_P(_T(MSG_CRASHDETECT_OFF), crash_mode_switch);\
         }\
         else MENU_ITEM_SUBMENU_P(_T(MSG_CRASHDETECT_NA), lcd_crash_mode_info);\
     }\
@@ -6903,8 +6896,8 @@ static void lcd_tune_menu()
 
           if (SilentModeMenu == SILENT_MODE_NORMAL)
           {
-               if (CrashDetectMenu == 0) MENU_ITEM_FUNCTION_P(_T(MSG_CRASHDETECT_OFF), lcd_crash_mode_set);
-               else MENU_ITEM_FUNCTION_P(_T(MSG_CRASHDETECT_ON), lcd_crash_mode_set);
+               if (lcd_crash_detect_enabled()) MENU_ITEM_FUNCTION_P(_T(MSG_CRASHDETECT_ON), crash_mode_switch);
+               else MENU_ITEM_FUNCTION_P(_T(MSG_CRASHDETECT_OFF), crash_mode_switch);
           }
           else MENU_ITEM_SUBMENU_P(_T(MSG_CRASHDETECT_NA), lcd_crash_mode_info);
      }
@@ -8645,3 +8638,27 @@ void menu_lcd_lcdupdate_func(void)
 	lcd_send_status();
 	if (lcd_commands_type == LcdCommands::Layer1Cal) lcd_commands();
 }
+
+#ifdef TMC2130
+//! @brief Is crash detection enabled?
+//!
+//! @retval true crash detection enabled
+//! @retval false crash detection disabled
+bool lcd_crash_detect_enabled()
+{
+    return eeprom_read_byte((uint8_t*)EEPROM_CRASH_DET);
+}
+
+void lcd_crash_detect_enable()
+{
+    tmc2130_sg_stop_on_crash = true;
+    eeprom_update_byte((uint8_t*)EEPROM_CRASH_DET, 0xFF);
+}
+
+void lcd_crash_detect_disable()
+{
+    tmc2130_sg_stop_on_crash = false;
+    tmc2130_sg_crash = 0;
+    eeprom_update_byte((uint8_t*)EEPROM_CRASH_DET, 0x00);
+}
+#endif

Firmware/ultralcd.h

@@ -53,6 +53,11 @@ void lcd_menu_statistics();
 
 void lcd_menu_extruder_info();                    // NOT static due to using inside "Marlin_main" module ("manage_inactivity()")
 void lcd_menu_show_sensors_state();               // NOT static due to using inside "Marlin_main" module ("manage_inactivity()")
+#ifdef TMC2130
+bool lcd_crash_detect_enabled();
+void lcd_crash_detect_enable();
+void lcd_crash_detect_disable();
+#endif
 
 extern const char* lcd_display_message_fullscreen_P(const char *msg, uint8_t &nlines);
 extern const char* lcd_display_message_fullscreen_P(const char *msg);