diff -r 000000000000 -r 88d965579617 components/u8g2/csrc/u8x8_d_stdio.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/components/u8g2/csrc/u8x8_d_stdio.c	Tue Oct 08 12:00:31 2019 +0200
@@ -0,0 +1,101 @@
+/*
+
+  u8x8_d_stdio.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"
+
+#include <stdio.h>
+
+#define W 8
+#define H 2
+
+uint8_t bitmap[W*H*8];
+
+void bitmap_place_tile(uint8_t x, uint8_t y, uint8_t *tile)
+{
+  uint8_t i;
+  for(i = 0; i < 8; i++ )
+    bitmap[x*8+y*W*8+i] = tile[i];
+}
+
+void bitmap_show(void)
+{
+  int x, y;
+  for( y = 0; y < H*8; y++ )
+  {
+    for( x = 0; x < W*8; x++ )
+    {
+      if ( (bitmap[x+(y/8)*W*8] & (1<<((y&7)))) != 0 )
+      {
+	printf("*");
+      }
+      else
+      {
+	printf(".");
+      }
+    }
+    printf("\n");
+  }
+}
+
+
+uint8_t u8x8_d_stdio(U8X8_UNUSED u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr)
+{
+  switch(msg)
+  {
+    case U8X8_MSG_DISPLAY_INIT:
+      break;
+    case U8X8_MSG_DISPLAY_SET_POWER_SAVE:
+      if ( arg_int == 0 )
+	bitmap_show();
+      break;
+    case U8X8_MSG_DISPLAY_SET_CONTRAST:
+      break;
+    case U8X8_MSG_DISPLAY_DRAW_TILE:      
+      bitmap_place_tile(((u8x8_tile_t *)arg_ptr)->x_pos, ((u8x8_tile_t *)arg_ptr)->y_pos, ((u8x8_tile_t *)arg_ptr)->tile_ptr);
+      break;
+    default:
+      break;
+  }
+  return 1;
+}
+
+
+
+void u8x8_SetupStdio(u8x8_t *u8x8)
+{
+  u8x8_SetupDefaults(u8x8);
+  u8x8->display_cb = u8x8_d_stdio;
+}
+