diff -r 000000000000 -r 88d965579617 components/u8g2/csrc/u8g2_box.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/components/u8g2/csrc/u8g2_box.c	Tue Oct 08 12:00:31 2019 +0200
@@ -0,0 +1,207 @@
+/*
+
+  u8g2_box.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"
+
+/*
+  draw a filled box
+  restriction: does not work for w = 0 or h = 0
+*/
+void u8g2_DrawBox(u8g2_t *u8g2, u8g2_uint_t x, u8g2_uint_t y, u8g2_uint_t w, u8g2_uint_t h)
+{
+#ifdef U8G2_WITH_INTERSECTION
+  if ( u8g2_IsIntersection(u8g2, x, y, x+w, y+h) == 0 ) 
+    return;
+#endif /* U8G2_WITH_INTERSECTION */
+  while( h != 0 )
+  { 
+    u8g2_DrawHVLine(u8g2, x, y, w, 0);
+    y++;    
+    h--;
+  }
+}
+
+
+/*
+  draw a frame (empty box)
+  restriction: does not work for w = 0 or h = 0
+  ToDo:
+    pixel in the corners are drawn twice. This could be optimized.
+*/
+void u8g2_DrawFrame(u8g2_t *u8g2, u8g2_uint_t x, u8g2_uint_t y, u8g2_uint_t w, u8g2_uint_t h)
+{
+  u8g2_uint_t xtmp = x;
+  
+#ifdef U8G2_WITH_INTERSECTION
+  if ( u8g2_IsIntersection(u8g2, x, y, x+w, y+h) == 0 ) 
+    return;
+#endif /* U8G2_WITH_INTERSECTION */
+  
+  u8g2_DrawHVLine(u8g2, x, y, w, 0);
+  u8g2_DrawHVLine(u8g2, x, y, h, 1);
+  x+=w;
+  x--;
+  u8g2_DrawHVLine(u8g2, x, y, h, 1);
+  y+=h;
+  y--;
+  u8g2_DrawHVLine(u8g2, xtmp, y, w, 0);
+}
+
+
+
+
+void u8g2_DrawRBox(u8g2_t *u8g2, u8g2_uint_t x, u8g2_uint_t y, u8g2_uint_t w, u8g2_uint_t h, u8g2_uint_t r)
+{
+  u8g2_uint_t xl, yu;
+  u8g2_uint_t yl, xr;
+
+#ifdef U8G2_WITH_INTERSECTION
+  if ( u8g2_IsIntersection(u8g2, x, y, x+w, y+h) == 0 ) 
+    return;
+#endif /* U8G2_WITH_INTERSECTION */
+
+  xl = x;
+  xl += r;
+  yu = y;
+  yu += r;
+ 
+  xr = x;
+  xr += w;
+  xr -= r;
+  xr -= 1;
+  
+  yl = y;
+  yl += h;
+  yl -= r; 
+  yl -= 1;
+
+  u8g2_DrawDisc(u8g2, xl, yu, r, U8G2_DRAW_UPPER_LEFT);
+  u8g2_DrawDisc(u8g2, xr, yu, r, U8G2_DRAW_UPPER_RIGHT);
+  u8g2_DrawDisc(u8g2, xl, yl, r, U8G2_DRAW_LOWER_LEFT);
+  u8g2_DrawDisc(u8g2, xr, yl, r, U8G2_DRAW_LOWER_RIGHT);
+
+  {
+    u8g2_uint_t ww, hh;
+
+    ww = w;
+    ww -= r;
+    ww -= r;
+    xl++;
+    yu++;
+    
+    if ( ww >= 3 )
+    {
+      ww -= 2;
+      u8g2_DrawBox(u8g2, xl, y, ww, r+1);
+      u8g2_DrawBox(u8g2, xl, yl, ww, r+1);
+    }
+    
+    hh = h;
+    hh -= r;
+    hh -= r;
+    //h--;
+    if ( hh >= 3 )
+    {
+      hh -= 2;
+      u8g2_DrawBox(u8g2, x, yu, w, hh);
+    }
+  }
+}
+
+
+void u8g2_DrawRFrame(u8g2_t *u8g2, u8g2_uint_t x, u8g2_uint_t y, u8g2_uint_t w, u8g2_uint_t h, u8g2_uint_t r)
+{
+  u8g2_uint_t xl, yu;
+
+#ifdef U8G2_WITH_INTERSECTION
+  if ( u8g2_IsIntersection(u8g2, x, y, x+w, y+h) == 0 ) 
+    return;
+#endif /* U8G2_WITH_INTERSECTION */
+
+  xl = x;
+  xl += r;
+  yu = y;
+  yu += r;
+ 
+  {
+    u8g2_uint_t yl, xr;
+      
+    xr = x;
+    xr += w;
+    xr -= r;
+    xr -= 1;
+    
+    yl = y;
+    yl += h;
+    yl -= r; 
+    yl -= 1;
+
+    u8g2_DrawCircle(u8g2, xl, yu, r, U8G2_DRAW_UPPER_LEFT);
+    u8g2_DrawCircle(u8g2, xr, yu, r, U8G2_DRAW_UPPER_RIGHT);
+    u8g2_DrawCircle(u8g2, xl, yl, r, U8G2_DRAW_LOWER_LEFT);
+    u8g2_DrawCircle(u8g2, xr, yl, r, U8G2_DRAW_LOWER_RIGHT);
+  }
+
+  {
+    u8g2_uint_t ww, hh;
+
+    ww = w;
+    ww -= r;
+    ww -= r;
+    hh = h;
+    hh -= r;
+    hh -= r;
+    
+    xl++;
+    yu++;
+    
+    if ( ww >= 3 )
+    {
+      ww -= 2;
+      h--;
+      u8g2_DrawHLine(u8g2, xl, y, ww);
+      u8g2_DrawHLine(u8g2, xl, y+h, ww);
+    }
+    
+    if ( hh >= 3 )
+    {
+      hh -= 2;
+      w--;
+      u8g2_DrawVLine(u8g2, x, yu, hh);
+      u8g2_DrawVLine(u8g2, x+w, yu, hh);
+    }
+  }
+}
+