Scrolling status message option

Marlin/Configuration_adv.h

 // Include a page of printer information in the LCD Main Menu
 //#define LCD_INFO_MENU
 
+// Scroll a longer status message into view
+//#define STATUS_MESSAGE_SCROLLING
+
 // On the Info Screen, display XY with one decimal place when possible
 //#define LCD_DECIMAL_SMALL_XY
 

Marlin/example_configurations/Cartesio/Configuration_adv.h

 // Include a page of printer information in the LCD Main Menu
 //#define LCD_INFO_MENU
 
+// Scroll a longer status message into view
+//#define STATUS_MESSAGE_SCROLLING
+
 // On the Info Screen, display XY with one decimal place when possible
 //#define LCD_DECIMAL_SMALL_XY
 

Marlin/example_configurations/Felix/Configuration_adv.h

 // Include a page of printer information in the LCD Main Menu
 //#define LCD_INFO_MENU
 
+// Scroll a longer status message into view
+//#define STATUS_MESSAGE_SCROLLING
+
 // On the Info Screen, display XY with one decimal place when possible
 //#define LCD_DECIMAL_SMALL_XY
 

Marlin/example_configurations/FolgerTech-i3-2020/Configuration_adv.h

 // Include a page of printer information in the LCD Main Menu
 //#define LCD_INFO_MENU
 
+// Scroll a longer status message into view
+//#define STATUS_MESSAGE_SCROLLING
+
 // On the Info Screen, display XY with one decimal place when possible
 //#define LCD_DECIMAL_SMALL_XY
 

Marlin/example_configurations/Hephestos/Configuration_adv.h

 // Include a page of printer information in the LCD Main Menu
 //#define LCD_INFO_MENU
 
+// Scroll a longer status message into view
+//#define STATUS_MESSAGE_SCROLLING
+
 // On the Info Screen, display XY with one decimal place when possible
 //#define LCD_DECIMAL_SMALL_XY
 

Marlin/example_configurations/Hephestos_2/Configuration_adv.h

 // Include a page of printer information in the LCD Main Menu
 #define LCD_INFO_MENU
 
+// Scroll a longer status message into view
+//#define STATUS_MESSAGE_SCROLLING
+
 // On the Info Screen, display XY with one decimal place when possible
 #define LCD_DECIMAL_SMALL_XY
 

Marlin/example_configurations/K8200/Configuration_adv.h

 // Include a page of printer information in the LCD Main Menu
 //#define LCD_INFO_MENU
 
+// Scroll a longer status message into view
+//#define STATUS_MESSAGE_SCROLLING
+
 // On the Info Screen, display XY with one decimal place when possible
 //#define LCD_DECIMAL_SMALL_XY
 

Marlin/example_configurations/K8400/Configuration_adv.h

 // Include a page of printer information in the LCD Main Menu
 //#define LCD_INFO_MENU
 
+// Scroll a longer status message into view
+//#define STATUS_MESSAGE_SCROLLING
+
 // On the Info Screen, display XY with one decimal place when possible
 //#define LCD_DECIMAL_SMALL_XY
 

Marlin/example_configurations/RigidBot/Configuration_adv.h

 // Include a page of printer information in the LCD Main Menu
 //#define LCD_INFO_MENU
 
+// Scroll a longer status message into view
+//#define STATUS_MESSAGE_SCROLLING
+
 // On the Info Screen, display XY with one decimal place when possible
 //#define LCD_DECIMAL_SMALL_XY
 

Marlin/example_configurations/SCARA/Configuration_adv.h

 // Include a page of printer information in the LCD Main Menu
 //#define LCD_INFO_MENU
 
+// Scroll a longer status message into view
+//#define STATUS_MESSAGE_SCROLLING
+
 // On the Info Screen, display XY with one decimal place when possible
 //#define LCD_DECIMAL_SMALL_XY
 

Marlin/example_configurations/TAZ4/Configuration_adv.h

 // Include a page of printer information in the LCD Main Menu
 //#define LCD_INFO_MENU
 
+// Scroll a longer status message into view
+//#define STATUS_MESSAGE_SCROLLING
+
 // On the Info Screen, display XY with one decimal place when possible
 //#define LCD_DECIMAL_SMALL_XY
 

Marlin/example_configurations/TinyBoy2/Configuration_adv.h

 // Include a page of printer information in the LCD Main Menu
 #define LCD_INFO_MENU
 
+// Scroll a longer status message into view
+//#define STATUS_MESSAGE_SCROLLING
+
 // On the Info Screen, display XY with one decimal place when possible
 //#define LCD_DECIMAL_SMALL_XY
 

Marlin/example_configurations/WITBOX/Configuration_adv.h

 // Include a page of printer information in the LCD Main Menu
 //#define LCD_INFO_MENU
 
+// Scroll a longer status message into view
+//#define STATUS_MESSAGE_SCROLLING
+
 // On the Info Screen, display XY with one decimal place when possible
 //#define LCD_DECIMAL_SMALL_XY
 

Marlin/example_configurations/delta/FLSUN/auto_calibrate/Configuration_adv.h

 // Include a page of printer information in the LCD Main Menu
 //#define LCD_INFO_MENU
 
+// Scroll a longer status message into view
+//#define STATUS_MESSAGE_SCROLLING
+
 // On the Info Screen, display XY with one decimal place when possible
 //#define LCD_DECIMAL_SMALL_XY
 

Marlin/example_configurations/delta/FLSUN/kossel_mini/Configuration_adv.h

 // Include a page of printer information in the LCD Main Menu
 //#define LCD_INFO_MENU
 
+// Scroll a longer status message into view
+//#define STATUS_MESSAGE_SCROLLING
+
 // On the Info Screen, display XY with one decimal place when possible
 //#define LCD_DECIMAL_SMALL_XY
 

Marlin/example_configurations/delta/generic/Configuration_adv.h

 // Include a page of printer information in the LCD Main Menu
 //#define LCD_INFO_MENU
 
+// Scroll a longer status message into view
+//#define STATUS_MESSAGE_SCROLLING
+
 // On the Info Screen, display XY with one decimal place when possible
 //#define LCD_DECIMAL_SMALL_XY
 

Marlin/example_configurations/delta/kossel_mini/Configuration_adv.h

 // Include a page of printer information in the LCD Main Menu
 //#define LCD_INFO_MENU
 
+// Scroll a longer status message into view
+//#define STATUS_MESSAGE_SCROLLING
+
 // On the Info Screen, display XY with one decimal place when possible
 //#define LCD_DECIMAL_SMALL_XY
 

Marlin/example_configurations/delta/kossel_pro/Configuration_adv.h

 // Include a page of printer information in the LCD Main Menu
 //#define LCD_INFO_MENU
 
+// Scroll a longer status message into view
+//#define STATUS_MESSAGE_SCROLLING
+
 // On the Info Screen, display XY with one decimal place when possible
 //#define LCD_DECIMAL_SMALL_XY
 

Marlin/example_configurations/delta/kossel_xl/Configuration_adv.h

 // Include a page of printer information in the LCD Main Menu
 //#define LCD_INFO_MENU
 
+// Scroll a longer status message into view
+//#define STATUS_MESSAGE_SCROLLING
+
 // On the Info Screen, display XY with one decimal place when possible
 //#define LCD_DECIMAL_SMALL_XY
 

Marlin/example_configurations/gCreate_gMax1.5+/Configuration_adv.h

 // Include a page of printer information in the LCD Main Menu
 //#define LCD_INFO_MENU
 
+// Scroll a longer status message into view
+//#define STATUS_MESSAGE_SCROLLING
+
 // On the Info Screen, display XY with one decimal place when possible
 //#define LCD_DECIMAL_SMALL_XY
 

Marlin/example_configurations/makibox/Configuration_adv.h

 // Include a page of printer information in the LCD Main Menu
 //#define LCD_INFO_MENU
 
+// Scroll a longer status message into view
+//#define STATUS_MESSAGE_SCROLLING
+
 // On the Info Screen, display XY with one decimal place when possible
 //#define LCD_DECIMAL_SMALL_XY
 

Marlin/example_configurations/tvrrug/Round2/Configuration_adv.h

 // Include a page of printer information in the LCD Main Menu
 //#define LCD_INFO_MENU
 
+// Scroll a longer status message into view
+//#define STATUS_MESSAGE_SCROLLING
+
 // On the Info Screen, display XY with one decimal place when possible
 //#define LCD_DECIMAL_SMALL_XY
 

Marlin/example_configurations/wt150/Configuration_adv.h

 // Include a page of printer information in the LCD Main Menu
 #define LCD_INFO_MENU
 
+// Scroll a longer status message into view
+//#define STATUS_MESSAGE_SCROLLING
+
 // On the Info Screen, display XY with one decimal place when possible
 //#define LCD_DECIMAL_SMALL_XY
 

Marlin/ultralcd.cpp

 
 uint8_t lcd_status_message_level;
 char lcd_status_message[3 * (LCD_WIDTH) + 1] = WELCOME_MSG; // worst case is kana with up to 3*LCD_WIDTH+1
+#if ENABLED(STATUS_MESSAGE_SCROLLING)
+  uint8_t status_scroll_pos = 0;
+#endif
 
 #if ENABLED(DOGLCD)
   #include "ultralcd_impl_DOGM.h"
   } // ELAPSED(ms, next_lcd_update_ms)
 }
 
-void set_utf_strlen(char* s, uint8_t n) {
-  uint8_t i = 0, j = 0;
-  while (s[i] && (j < n)) {
-    #if ENABLED(MAPPER_NON)
-      j++;
-    #else
-      if ((s[i] & 0xC0u) != 0x80u) j++;
-    #endif
-    i++;
+#if DISABLED(STATUS_MESSAGE_SCROLLING)
+
+  void set_utf_strlen(char* s, uint8_t n) {
+    uint8_t i = 0, j = 0;
+    while (s[i] && (j < n)) {
+      #if ENABLED(MAPPER_NON)
+        j++;
+      #else
+        if ((s[i] & 0xC0u) != 0x80u) j++;
+      #endif
+      i++;
+    }
+    while (j++ < n) s[i++] = ' ';
+    s[i] = '\0';
   }
-  while (j++ < n) s[i++] = ' ';
-  s[i] = '\0';
-}
+
+#endif // !STATUS_MESSAGE_SCROLLING
 
 void lcd_finishstatus(bool persist=false) {
-  set_utf_strlen(lcd_status_message, LCD_WIDTH);
+  #if DISABLED(STATUS_MESSAGE_SCROLLING)
+    set_utf_strlen(lcd_status_message, LCD_WIDTH);
+  #endif
+
   #if !(ENABLED(LCD_PROGRESS_BAR) && (PROGRESS_MSG_EXPIRE > 0))
     UNUSED(persist);
   #endif
   #if ENABLED(FILAMENT_LCD_DISPLAY) && ENABLED(SDSUPPORT)
     previous_lcd_status_ms = millis();  //get status message to show up for a while
   #endif
+
+  #if ENABLED(STATUS_MESSAGE_SCROLLING)
+    status_scroll_pos = 0;
+  #endif
 }
 
 #if ENABLED(LCD_PROGRESS_BAR) && PROGRESS_MSG_EXPIRE > 0

Marlin/ultralcd_impl_DOGM.h

   else return charset_mapper(c);
 }
 
-void lcd_print(const char* const str) {
-  for (uint8_t i = 0; char c = str[i]; ++i) lcd_print(c);
+/**
+ * Core LCD printing functions
+ * On DOGM all strings go through a filter for utf
+ * But only use lcd_print_utf and lcd_printPGM_utf for translated text
+ */
+void lcd_print(const char* const str) { for (uint8_t i = 0; char c = str[i]; ++i) lcd_print(c); }
+void lcd_printPGM(const char* str) { for (; char c = pgm_read_byte(str); ++str) lcd_print(c); }
+
+void lcd_print_utf(const char* const str, const uint8_t maxLength=LCD_WIDTH) {
+  char c;
+  for (uint8_t i = 0, n = maxLength; n && (c = str[i]); ++i)
+    n -= charset_mapper(c);
 }
 
-/* Arduino < 1.0.0 is missing a function to print PROGMEM strings, so we need to implement our own */
-void lcd_printPGM(const char* str) {
-  for (; char c = pgm_read_byte(str); ++str) lcd_print(c);
+void lcd_printPGM_utf(const char* str, const uint8_t maxLength=LCD_WIDTH) {
+  char c;
+  for (uint8_t i = 0, n = maxLength; n && (c = str[i]); ++i)
+    n -= charset_mapper(c);
 }
 
 // Initialize or re-initialize the LCD
 void lcd_kill_screen() {
   lcd_setFont(FONT_MENU);
   u8g.setPrintPos(0, u8g.getHeight()/4*1);
-  lcd_print(lcd_status_message);
+  lcd_print_utf(lcd_status_message);
   u8g.setPrintPos(0, u8g.getHeight()/4*2);
   lcd_printPGM(PSTR(MSG_HALTED));
   u8g.setPrintPos(0, u8g.getHeight()/4*3);
   }
 }
 
+inline void lcd_implementation_status_message() {
+  #if ENABLED(STATUS_MESSAGE_SCROLLING)
+    lcd_print_utf(lcd_status_message + status_scroll_pos);
+    const uint8_t slen = lcd_strlen(lcd_status_message);
+    if (slen > LCD_WIDTH) {
+      // Skip any non-printing bytes
+      while (!charset_mapper(lcd_status_message[status_scroll_pos])) ++status_scroll_pos;
+      if (++status_scroll_pos > slen - LCD_WIDTH) status_scroll_pos = 0;
+    }
+  #else
+    lcd_print_utf(lcd_status_message);
+  #endif
+}
+
 //#define DOGM_SD_PERCENT
 
 static void lcd_implementation_status_screen() {
 
     #if ENABLED(FILAMENT_LCD_DISPLAY) && ENABLED(SDSUPPORT)
       if (PENDING(millis(), previous_lcd_status_ms + 5000UL)) {  //Display both Status message line and Filament display on the last line
-        const char *str = lcd_status_message;
-        uint8_t i = LCD_WIDTH;
-        char c;
-        while (i-- && (c = *str++)) lcd_print(c);
+        lcd_implementation_status_message();
       }
       else {
         lcd_printPGM(PSTR(LCD_STR_FILAM_DIA));
         u8g.print('%');
       }
     #else
-      const char *str = lcd_status_message;
-      uint8_t i = LCD_WIDTH;
-      char c;
-      while (i-- && (c = *str++)) lcd_print(c);
+      lcd_implementation_status_message();
     #endif
   }
 }

Marlin/ultralcd_impl_HD44780.h

 
 void lcd_implementation_clear() { lcd.clear(); }
 
-/* Arduino < 1.0.0 is missing a function to print PROGMEM strings, so we need to implement our own */
-void lcd_printPGM(const char *str) {
-  for (; char c = pgm_read_byte(str); ++str) charset_mapper(c);
-}
+void lcd_print(const char c) { charset_mapper(c); }
+
+void lcd_print(const char * const str) { for (uint8_t i = 0; char c = str[i]; ++i) lcd.print(c); }
+void lcd_printPGM(const char* str) { for (; char c = pgm_read_byte(str); ++str) lcd.print(c); }
 
-void lcd_print(const char* const str) {
-  for (uint8_t i = 0; const char c = str[i]; ++i) charset_mapper(c);
+void lcd_print_utf(const char * const str, const uint8_t maxLength=LCD_WIDTH) {
+  char c;
+  for (uint8_t i = 0, n = maxLength; n && (c = str[i]); ++i)
+    n -= charset_mapper(c);
 }
 
-void lcd_print(const char c) { charset_mapper(c); }
+void lcd_printPGM_utf(const char* str, const uint8_t maxLength=LCD_WIDTH) {
+  char c;
+  for (uint8_t i = 0, n = maxLength; n && (c = str[i]); ++i)
+    n -= charset_mapper(c);
+}
 
 #if ENABLED(SHOW_BOOTSCREEN)
 
 
 void lcd_kill_screen() {
   lcd.setCursor(0, 0);
-  lcd_print(lcd_status_message);
+  lcd_print_utf(lcd_status_message);
   #if LCD_HEIGHT < 4
     lcd.setCursor(0, 2);
   #else
 
   #endif // FILAMENT_LCD_DISPLAY && SDSUPPORT
 
-  const char *str = lcd_status_message;
-  uint8_t i = LCD_WIDTH;
-  char c;
-  while (i-- && (c = *str++)) lcd_print(c);
+  #if ENABLED(STATUS_MESSAGE_SCROLLING)
+    lcd_print_utf(lcd_status_message + status_scroll_pos);
+    const uint8_t slen = lcd_strlen(lcd_status_message);
+    if (slen > LCD_WIDTH) {
+      // Skip any non-printing bytes
+      while (!charset_mapper(lcd_status_message[status_scroll_pos])) ++status_scroll_pos;
+      if (++status_scroll_pos > slen - LCD_WIDTH) status_scroll_pos = 0;
+    }
+  #else
+    lcd_print_utf(lcd_status_message);
+  #endif
 }
 
 #if ENABLED(ULTIPANEL)