diff -r 000000000000 -r 88d965579617 components/u8g2/csrc/u8log_u8x8.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/components/u8g2/csrc/u8log_u8x8.c	Tue Oct 08 12:00:31 2019 +0200
@@ -0,0 +1,75 @@
+/*
+
+  u8log_u8x8.c
+  
+
+  Universal 8bit Graphics Library (https://github.com/olikraus/u8g2/)
+
+  Copyright (c) 2018, 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"
+
+static void u8x8_DrawLogLine(u8x8_t *u8x8, uint8_t disp_x, uint8_t disp_y, uint8_t buf_y, u8log_t *u8log) U8X8_NOINLINE;
+static void u8x8_DrawLogLine(u8x8_t *u8x8, uint8_t disp_x, uint8_t disp_y, uint8_t buf_y, u8log_t *u8log)
+{
+  uint8_t buf_x;
+  uint8_t c;
+  for( buf_x = 0; buf_x < u8log->width; buf_x++ )
+  {
+    c = u8log->screen_buffer[buf_y * u8log->width + buf_x];
+    u8x8_DrawGlyph(u8x8, disp_x, disp_y, c);
+    disp_x++;
+  }
+}
+
+void u8x8_DrawLog(u8x8_t *u8x8, uint8_t x, uint8_t y, u8log_t *u8log)
+{
+  uint8_t buf_y;
+  for( buf_y = 0; buf_y < u8log->height; buf_y++ )
+  {
+    u8x8_DrawLogLine(u8x8, x, y, buf_y, u8log);
+    y++;
+  }
+}
+
+
+void u8log_u8x8_cb(u8log_t * u8log)
+{
+  u8x8_t *u8x8 = (u8x8_t *)(u8log->aux_data);
+  if ( u8log->is_redraw_all )
+  {
+    u8x8_DrawLog(u8x8, 0, 0, u8log);
+  }
+  else if ( u8log->is_redraw_line )
+  {
+    u8x8_DrawLogLine(u8x8, 0, u8log->redraw_line, u8log->redraw_line, u8log);
+  }
+}
+