diff -r 000000000000 -r 88d965579617 components/u8g2/csrc/u8x8_u16toa.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/components/u8g2/csrc/u8x8_u16toa.c	Tue Oct 08 12:00:31 2019 +0200
@@ -0,0 +1,68 @@
+/*
+
+  u8x8_u16toa.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"
+
+const char *u8x8_u16toap(char * dest, uint16_t v)
+{
+  uint8_t pos;
+  uint8_t d;
+  uint16_t c;
+  c = 10000;
+  for( pos = 0; pos < 5; pos++ )
+  {
+      d = '0';
+      while( v >= c )
+      {
+	v -= c;
+	d++;
+      }
+      dest[pos] = d;
+      c /= 10;
+  }  
+  dest[5] = '\0';
+  return dest;
+}
+
+/* v = value, d = number of digits */
+const char *u8x8_u16toa(uint16_t v, uint8_t d)
+{
+  static char buf[6];
+  d = 5-d;
+  return u8x8_u16toap(buf, v) + d;
+}
+