M0-M1 Enhancements

Allow M0 and M1 to include a message string. Ignore clicks on “Wait for
user” so that the Info Screen stays up.

Marlin/Marlin_main.cpp

     case 0: // M0 - Unconditional stop - Wait for user button press on LCD
     case 1: // M1 - Conditional stop - Wait for user button press on LCD
     {
-      LCD_MESSAGEPGM(MSG_USERWAIT);
+      char *src = strchr_pointer + 2;
+
       codenum = 0;
-      if(code_seen('P')) codenum = code_value(); // milliseconds to wait
-      if(code_seen('S')) codenum = code_value() * 1000; // seconds to wait
 
+      bool hasP = code_seen('P');
+      if (hasP) codenum = code_value(); // milliseconds to wait
+
+      bool hasS = code_seen('S');
+      if (hasS) codenum = code_value() * 1000; // seconds to wait
+
+      if (!hasP && !hasS && *src != '\0') {
+        while (*src == ' ') ++src;
+        starpos = strchr(src, '*');
+        if (starpos != NULL) *(starpos) = '\0';
+        lcd_setstatus(src);
+      } else {
+        LCD_MESSAGEPGM(MSG_USERWAIT);
+      }
+
+      lcd_ignore_click();
       st_synchronize();
       previous_millis_cmd = millis();
       if (codenum > 0){
           manage_inactivity();
           lcd_update();
         }
+        lcd_ignore_click(false);
       }else{
         while(!lcd_clicked()){
           manage_heater();

Marlin/ultralcd.cpp

 menuFunc_t currentMenu = lcd_status_screen; /* function pointer to the currently active menu */
 uint32_t lcd_next_update_millis;
 uint8_t lcd_status_update_delay;
+bool ignore_click = false;
 uint8_t lcdDrawUpdate = 2;                  /* Set to none-zero when the LCD needs to draw, decreased after every draw. Set to 2 in LCD routines so the LCD gets at least 1 full redraw (first redraw is partial) */
 
 //prevMenu and prevEncoderPosition are used to store the previous menu location when editing settings.
         lcd_status_update_delay = 10;   /* redraw the main screen every second. This is easier then trying keep track of all things that change on the screen */
     }
 #ifdef ULTIPANEL
-    if (LCD_CLICKED)
+
+    if (lcd_clicked())
     {
         currentMenu = lcd_main_menu;
         encoderPosition = 0;
     }
 }
 
+void lcd_ignore_click(bool b)
+{
+    ignore_click = b;
+}
+
 void lcd_setstatus(const char* message)
 {
     if (lcd_status_message_level > 0)
 
 bool lcd_clicked()
 {
-  return LCD_CLICKED;
+  static bool wait_for_unclick = false;
+  bool current_click = LCD_CLICKED;
+
+  if (ignore_click) {
+    if (wait_for_unclick) {
+      if (!current_click) {
+        ignore_click = wait_for_unclick = false;
+      }
+      else {
+        current_click = false;
+      }
+    }
+    else if (current_click) {
+      wait_for_unclick = true;
+      current_click = false;
+      lcd_quick_feedback();
+    }
+  }
+
+  return current_click;
 }
 #endif//ULTIPANEL
 

Marlin/ultralcd.h

   void lcd_buzz(long duration,uint16_t freq);
   bool lcd_clicked();
 
+  void lcd_ignore_click(bool b=true);
+
   #ifdef NEWPANEL
     #define EN_C (1<<BLEN_C)
     #define EN_B (1<<BLEN_B)