SHOW_REMAINING_TIME for HD44780 character LCD (#19416)

Marlin/Configuration_adv.h

@@ -1105,16 +1105,18 @@
   #define BOOTSCREEN_TIMEOUT 4000        // (ms) Total Duration to display the boot screen(s)
 #endif
 
-#if HAS_GRAPHICAL_LCD && EITHER(SDSUPPORT, LCD_SET_PROGRESS_MANUALLY)
-  //#define PRINT_PROGRESS_SHOW_DECIMALS // Show progress with decimal digits
+#if EITHER(SDSUPPORT, LCD_SET_PROGRESS_MANUALLY) && (HAS_GRAPHICAL_LCD || HAS_CHARACTER_LCD)
   //#define SHOW_REMAINING_TIME       // Display estimated time to completion
   #if ENABLED(SHOW_REMAINING_TIME)
     //#define USE_M73_REMAINING_TIME  // Use remaining time from M73 command instead of estimation
     //#define ROTATE_PROGRESS_DISPLAY // Display (P)rogress, (E)lapsed, and (R)emaining time
   #endif
-#endif
 
-#if HAS_CHARACTER_LCD && EITHER(SDSUPPORT, LCD_SET_PROGRESS_MANUALLY)
+  #if HAS_GRAPHICAL_LCD
+    //#define PRINT_PROGRESS_SHOW_DECIMALS // Show progress with decimal digits
+  #endif
+
+  #if HAS_CHARACTER_LCD
     //#define LCD_PROGRESS_BAR            // Show a progress bar on HD44780 LCDs for SD printing
     #if ENABLED(LCD_PROGRESS_BAR)
       #define PROGRESS_BAR_BAR_TIME 2000  // (ms) Amount of time to show the bar
@@ -1123,6 +1125,7 @@
       //#define PROGRESS_MSG_ONCE         // Show the message for MSG_TIME then clear it
       //#define LCD_PROGRESS_BAR_TEST     // Add a menu item to test the progress bar
     #endif
+  #endif
 #endif
 
 #if ENABLED(SDSUPPORT)

Marlin/src/inc/SanityCheck.h

@@ -692,8 +692,8 @@ static_assert(Y_MAX_LENGTH >= Y_BED_SIZE, "Movement bounds (Y_MIN_POS, Y_MAX_POS
   #elif PROGRESS_MSG_EXPIRE < 0
     #error "PROGRESS_MSG_EXPIRE must be greater than or equal to 0."
   #endif
-#elif ENABLED(LCD_SET_PROGRESS_MANUALLY) && NONE(HAS_GRAPHICAL_LCD, HAS_GRAPHICAL_TFT, EXTENSIBLE_UI)
-  #error "LCD_SET_PROGRESS_MANUALLY requires LCD_PROGRESS_BAR, Graphical LCD, TFT, or EXTENSIBLE_UI."
+#elif ENABLED(LCD_SET_PROGRESS_MANUALLY) && NONE(HAS_GRAPHICAL_LCD, HAS_GRAPHICAL_TFT, HAS_CHARACTER_LCD, EXTENSIBLE_UI)
+  #error "LCD_SET_PROGRESS_MANUALLY requires LCD_PROGRESS_BAR, Character LCD, Graphical LCD, TFT, or EXTENSIBLE_UI."
 #endif
 
 #if !HAS_LCD_MENU && ENABLED(SD_REPRINT_LAST_SELECTED_FILE)
@@ -3055,8 +3055,6 @@ static_assert(   _ARR_TEST(3,0) && _ARR_TEST(3,1) && _ARR_TEST(3,2)
 #if !HAS_GRAPHICAL_LCD
   #if ENABLED(PRINT_PROGRESS_SHOW_DECIMALS)
     #error "PRINT_PROGRESS_SHOW_DECIMALS currently requires a Graphical LCD."
-  #elif ENABLED(SHOW_REMAINING_TIME)
-    #error "SHOW_REMAINING_TIME currently requires a Graphical LCD."
   #endif
 #endif
 

Marlin/src/lcd/HD44780/ultralcd_HD44780.cpp

@@ -845,10 +845,31 @@ void MarlinUI::draw_status_screen() {
       lcd_put_wchar('%');
 
       char buffer[14];
+      uint8_t timepos = 0;
+      #if ENABLED(SHOW_REMAINING_TIME)
+        const bool show_remain = TERN1(ROTATE_PROGRESS_DISPLAY, blink) && (printingIsActive() || marlin_state == MF_SD_COMPLETE);
+        if (show_remain) {
+          #if ENABLED(USE_M73_REMAINING_TIME)
+            duration_t remaining = get_remaining_time();
+          #else
+            uint8_t progress = get_progress_percent();
+            uint32_t elapsed = print_job_timer.duration();
+            duration_t remaining = (progress > 0) ? ((elapsed * 25600 / progress) >> 8) - elapsed : 0;
+          #endif
+          const uint8_t len = remaining.toDigital(buffer);
+          timepos = LCD_WIDTH - 1 - len;
+          lcd_put_wchar(timepos, 2, 'R');
+        }
+      #else
+        constexpr bool show_remain = false;
+      #endif
+
+      if (!show_remain) {
         duration_t elapsed = print_job_timer.duration();
-      const uint8_t len = elapsed.toDigital(buffer),
-                    timepos = LCD_WIDTH - len - 1;
+        const uint8_t len = elapsed.toDigital(buffer);
+        timepos = LCD_WIDTH - 1 - len;
         lcd_put_wchar(timepos, 2, LCD_STR_CLOCK[0]);
+      }
       lcd_put_u8str(buffer);
 
       #if LCD_WIDTH >= 20