diff -r 000000000000 -r 88d965579617 components/u8g2/csrc/u8x8_input_value.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/components/u8g2/csrc/u8x8_input_value.c	Tue Oct 08 12:00:31 2019 +0200
@@ -0,0 +1,123 @@
+/*
+
+  u8x8_input_value.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"
+
+/*
+  return:
+    0: value is not changed (HOME/Break Button pressed)
+    1: value has been updated
+*/
+
+uint8_t u8x8_UserInterfaceInputValue(u8x8_t *u8x8, const char *title, const char *pre, uint8_t *value, uint8_t lo, uint8_t hi, uint8_t digits, const char *post)
+{
+  uint8_t height;
+  uint8_t y;
+  uint8_t width;
+  uint8_t x;
+  uint8_t local_value = *value;
+  uint8_t r;
+  uint8_t event;
+
+  /* calculate overall height of the input value box */
+  height = 1;	/* button line */
+  height += u8x8_GetStringLineCnt(title);
+  
+  /* calculate offset from top */
+  y = 0;
+  if ( height < u8x8_GetRows(u8x8)  )
+  {
+    y = u8x8_GetRows(u8x8);
+    y -= height;
+    y /= 2;
+  }
+  
+  /* calculate offset from left for the label */
+  x = 0;
+  width = u8x8_GetUTF8Len(u8x8, pre);
+  width += digits;
+  width += u8x8_GetUTF8Len(u8x8, post);
+  if ( width < u8x8_GetCols(u8x8) )
+  {
+    x = u8x8_GetCols(u8x8);
+    x -= width;
+    x /= 2;
+  }
+  
+  /* render */
+  u8x8_ClearDisplay(u8x8);   /* required, because not everything is filled */
+  u8x8_SetInverseFont(u8x8, 0);  
+  y += u8x8_DrawUTF8Lines(u8x8, 0, y, u8x8_GetCols(u8x8), title);
+  x += u8x8_DrawUTF8(u8x8, x, y, pre);
+  u8x8_DrawUTF8(u8x8, x+digits, y, post);
+  u8x8_SetInverseFont(u8x8, 1);
+  
+  /* event loop */
+  u8x8_DrawUTF8(u8x8, x, y, u8x8_u8toa(local_value, digits));
+  for(;;)
+  {
+    event = u8x8_GetMenuEvent(u8x8);
+    if ( event == U8X8_MSG_GPIO_MENU_SELECT )
+    {
+      *value = local_value;
+      r = 1;
+      break;
+    }
+    else if ( event == U8X8_MSG_GPIO_MENU_HOME )
+    {
+      r = 0;
+      break;
+    }
+    else if ( event == U8X8_MSG_GPIO_MENU_NEXT || event == U8X8_MSG_GPIO_MENU_UP )
+    {
+      if ( local_value >= hi )
+	local_value = lo;
+      else
+	local_value++;
+      u8x8_DrawUTF8(u8x8, x, y, u8x8_u8toa(local_value, digits));
+    }
+    else if ( event == U8X8_MSG_GPIO_MENU_PREV || event == U8X8_MSG_GPIO_MENU_DOWN )
+    {
+      if ( local_value <= lo )
+	local_value = hi;
+      else
+	local_value--;
+      u8x8_DrawUTF8(u8x8, x, y, u8x8_u8toa(local_value, digits));
+    }        
+  }
+  
+  u8x8_SetInverseFont(u8x8, 0);
+  return r;  
+}