diff -r 000000000000 -r 88d965579617 components/u8g2/csrc/u8g2_kerning.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/components/u8g2/csrc/u8g2_kerning.c	Tue Oct 08 12:00:31 2019 +0200
@@ -0,0 +1,94 @@
+/*
+
+  u8g2_kerning.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 "u8g2.h"
+
+/* this function is used as "u8g2_get_kerning_cb" */
+/*
+uint8_t u8g2_GetNullKerning(u8g2_t *u8g2, uint16_t e1, uint16_t e2)
+{
+  return 0;
+}
+*/
+
+/* this function is used as "u8g2_get_kerning_cb" */
+uint8_t u8g2_GetKerning(U8X8_UNUSED u8g2_t *u8g2, u8g2_kerning_t *kerning, uint16_t e1, uint16_t e2)
+{
+  uint16_t i1, i2, cnt, end;
+  if ( kerning == NULL )
+    return 0;
+  
+  /* search for the encoding in the first table */
+  cnt = kerning->first_table_cnt;
+  cnt--;	/* ignore the last element of the table, which is 0x0ffff */
+  for( i1 = 0; i1 < cnt; i1++ )
+  {
+    if ( kerning->first_encoding_table[i1] == e1 )
+      break;
+  }
+  if ( i1 >= cnt )
+    return 0;	/* e1 not part of the kerning table, return 0 */
+
+  /* get the upper index for i2 */
+  end = kerning->index_to_second_table[i1+1];
+  for( i2 = kerning->index_to_second_table[i1]; i2 < end; i2++ )
+  {
+    if ( kerning->second_encoding_table[i2] == e2 )
+      break;
+  }
+  
+  if ( i2 >= end )
+    return 0;	/* e2 not part of any pair with e1, return 0 */
+  
+  return kerning->kerning_values[i2];
+}
+
+uint8_t u8g2_GetKerningByTable(U8X8_UNUSED u8g2_t *u8g2, const uint16_t *kt, uint16_t e1, uint16_t e2)
+{
+  uint16_t i;
+  i = 0;
+  if ( kt == NULL )
+    return 0;
+  for(;;)
+  {
+    if ( kt[i] == 0x0ffff )
+      break;
+    if ( kt[i] == e1 && kt[i+1] == e2 )
+      return kt[i+2];
+    i+=3;
+  }
+  return 0;
+}
+