diff -r 000000000000 -r 88d965579617 components/u8g2/csrc/u8x8_message.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/components/u8g2/csrc/u8x8_message.c	Tue Oct 08 12:00:31 2019 +0200
@@ -0,0 +1,152 @@
+/*
+
+  u8x8_message.c
+  
+  Universal 8bit Graphics Library (https://github.com/olikraus/u8g2/)
+
+  Copyright (c) 2016, olikraus@gmail.com
+  All rights reserved.
+
+  Redistribution and use in source and binary forms, with or without modification, 
+  are permitted provided that the following conditions are met:
+
+  * Redistributions of source code must retain the above copyright notice, this list 
+    of conditions and the following disclaimer.
+    
+  * Redistributions in binary form must reproduce the above copyright notice, this 
+    list of conditions and the following disclaimer in the documentation and/or other 
+    materials provided with the distribution.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 
+  CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, 
+  INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
+  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
+  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 
+  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
+  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 
+  NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 
+  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 
+  CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 
+  STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
+  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 
+  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.  
+  
+*/
+
+#include "u8x8.h"
+
+uint8_t u8x8_draw_button_line(u8x8_t *u8x8, uint8_t y, uint8_t w, uint8_t cursor, const char *s)
+{
+  uint8_t i;
+  uint8_t cnt;
+  uint8_t total;
+  uint8_t d;
+  uint8_t x;
+  cnt = u8x8_GetStringLineCnt(s);
+  
+  /* calculate the width of the button */
+  total = 0;
+  for( i = 0; i < cnt; i++ )
+  {
+    total += u8x8_GetUTF8Len(u8x8, u8x8_GetStringLineStart(i, s));
+  }
+  total += (cnt-1);	/* had one space between the buttons */
+  
+  /* calculate the left offset */
+  d = 0;
+  if ( total < w )
+  {
+    d = w;
+    d -= total;
+    d /= 2;
+  }
+  
+  /* draw the buttons */
+  x = d;
+  u8x8_SetInverseFont(u8x8, 0);
+  for( i = 0; i < cnt; i++ )
+  {
+    if ( i == cursor )
+      u8x8_SetInverseFont(u8x8, 1);
+      
+    x+=u8x8_DrawUTF8(u8x8, x, y, u8x8_GetStringLineStart(i, s));
+    u8x8_SetInverseFont(u8x8, 0);
+    x+=u8x8_DrawUTF8(u8x8, x, y, " ");
+  }
+  
+  /* return the number of buttons */
+  return cnt;
+}
+
+/*
+  title1:	Multiple lines,separated by '\n'
+  title2:	A single line/string which is terminated by '\0' or '\n' . "title2" accepts the return value from u8x8_GetStringLineStart()
+  title3:	Multiple lines,separated by '\n'
+  buttons:	one more more buttons separated by '\n' and terminated with '\0'
+*/
+
+uint8_t u8x8_UserInterfaceMessage(u8x8_t *u8x8, const char *title1, const char *title2, const char *title3, const char *buttons)
+{
+  uint8_t height;
+  uint8_t y;
+  uint8_t cursor = 0;
+  uint8_t button_cnt;
+  uint8_t event;
+
+  u8x8_SetInverseFont(u8x8, 0);
+  
+  /* calculate overall height of the message box */
+  height = 1;	/* button line */
+  height += u8x8_GetStringLineCnt(title1);
+  if ( title2 != NULL )
+    height ++;
+  height += u8x8_GetStringLineCnt(title3);
+  
+  /* calculate offset from top */
+  y = 0;
+  if ( height < u8x8_GetRows(u8x8)  )
+  {
+    y = u8x8_GetRows(u8x8);
+    y -= height;
+    y /= 2;
+  }
+
+  /* draw message box */
+  
+  u8x8_ClearDisplay(u8x8);   /* required, because not everything is filled */
+  
+  y += u8x8_DrawUTF8Lines(u8x8, 0, y, u8x8_GetCols(u8x8), title1);
+  if ( title2 != NULL )
+  {
+    u8x8_DrawUTF8Line(u8x8, 0, y, u8x8_GetCols(u8x8), title2);
+    y++;
+  }
+  y += u8x8_DrawUTF8Lines(u8x8, 0, y, u8x8_GetCols(u8x8), title3);
+
+  button_cnt = u8x8_draw_button_line(u8x8, y, u8x8_GetCols(u8x8), cursor, buttons);
+  
+  for(;;)
+  {
+    event = u8x8_GetMenuEvent(u8x8);
+    if ( event == U8X8_MSG_GPIO_MENU_SELECT )
+      return cursor+1;
+    else if ( event == U8X8_MSG_GPIO_MENU_HOME )
+      break;
+    else if ( event == U8X8_MSG_GPIO_MENU_NEXT || event == U8X8_MSG_GPIO_MENU_UP )
+    {
+      cursor++;
+      if ( cursor >= button_cnt )
+	cursor = 0;
+      u8x8_draw_button_line(u8x8, y, u8x8_GetCols(u8x8), cursor, buttons);
+    }
+    else if ( event == U8X8_MSG_GPIO_MENU_PREV || event == U8X8_MSG_GPIO_MENU_DOWN  )
+    {
+      if ( cursor == 0 )
+	cursor = button_cnt;
+      cursor--;
+      u8x8_draw_button_line(u8x8, y, u8x8_GetCols(u8x8), cursor, buttons);
+    }    
+  }  
+  return 0;
+}
+