diff -r 000000000000 -r 88d965579617 components/u8g2/csrc/u8x8_setup.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/components/u8g2/csrc/u8x8_setup.c	Tue Oct 08 12:00:31 2019 +0200
@@ -0,0 +1,147 @@
+/*
+
+  u8x8_setup.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"
+
+/* universal dummy callback, which will be default for all callbacks */
+uint8_t u8x8_dummy_cb(U8X8_UNUSED u8x8_t *u8x8, U8X8_UNUSED uint8_t msg, U8X8_UNUSED uint8_t arg_int, U8X8_UNUSED void *arg_ptr)
+{
+  /* the dummy callback will not handle any message and will fail for all messages */
+  return 0;
+}
+
+
+static const u8x8_display_info_t u8x8_null_display_info =
+{
+  /* chip_enable_level = */ 0,
+  /* chip_disable_level = */ 1,
+  
+  /* post_chip_enable_wait_ns = */ 0,
+  /* pre_chip_disable_wait_ns = */ 0,
+  /* reset_pulse_width_ms = */ 0, 
+  /* post_reset_wait_ms = */ 0, 
+  /* sda_setup_time_ns = */ 0,		
+  /* sck_pulse_width_ns = */ 0,	/* half of cycle time (100ns according to datasheet), AVR: below 70: 8 MHz, >= 70 --> 4MHz clock */
+  /* sck_clock_hz = */ 4000000UL,	/* since Arduino 1.6.0, the SPI bus speed in Hz. Should be  1000000000/sck_pulse_width_ns */
+  /* spi_mode = */ 0,		/* active high, rising edge */
+  /* i2c_bus_clock_100kHz = */ 4,
+  /* data_setup_time_ns = */ 0,
+  /* write_pulse_width_ns = */ 0,
+  /* tile_width = */ 1,		/* 8x8 */
+  /* tile_hight = */ 1,
+  /* default_x_offset = */ 0,
+  /* flipmode_x_offset = */ 0,
+  /* pixel_width = */ 8,
+  /* pixel_height = */ 8
+};
+
+
+/* a special null device */
+uint8_t u8x8_d_null_cb(u8x8_t *u8x8, uint8_t msg, U8X8_UNUSED uint8_t arg_int, U8X8_UNUSED void *arg_ptr)
+{
+  switch(msg)
+  {
+    case U8X8_MSG_DISPLAY_SETUP_MEMORY:
+      u8x8_d_helper_display_setup_memory(u8x8, &u8x8_null_display_info);
+      break;
+    case U8X8_MSG_DISPLAY_INIT:
+      u8x8_d_helper_display_init(u8x8);
+      break;
+  }
+  /* the null device callback will succeed for all messages */
+  return 1;
+}
+
+
+/*
+  Description:
+    Setup u8x8
+  Args:
+    u8x8	An empty u8x8 structure
+*/
+void u8x8_SetupDefaults(u8x8_t *u8x8)
+{
+    u8x8->display_info = NULL;
+    u8x8->display_cb = u8x8_dummy_cb;
+    u8x8->cad_cb = u8x8_dummy_cb;
+    u8x8->byte_cb = u8x8_dummy_cb;
+    u8x8->gpio_and_delay_cb = u8x8_dummy_cb;
+    u8x8->is_font_inverse_mode = 0;
+    u8x8->device_address = 0;
+    u8x8->utf8_state = 0;		/* also reset by u8x8_utf8_init */
+    u8x8->bus_clock = 0;		/* issue 769 */
+    u8x8->i2c_address = 255;
+    u8x8->debounce_default_pin_state = 255;	/* assume all low active buttons */
+  
+#ifdef U8X8_USE_PINS 
+  {
+    uint8_t i;
+    for( i = 0; i < U8X8_PIN_CNT; i++ )
+      u8x8->pins[i] = U8X8_PIN_NONE;
+  }
+#endif
+}
+
+
+/*
+  Description:
+    Setup u8x8 and assign the callback function. The dummy 
+    callback "u8x8_dummy_cb" can be used, if no callback is required.
+    This setup will not communicate with the display itself.
+    Use u8x8_InitDisplay() to send the startup code to the Display.
+  Args:
+    u8x8				An empty u8x8 structure
+    display_cb			Display/controller specific callback function
+    cad_cb				Display controller specific communication callback function
+    byte_cb			Display controller/communication specific callback funtion
+    gpio_and_delay_cb	Environment specific callback function
+
+*/
+void u8x8_Setup(u8x8_t *u8x8, u8x8_msg_cb display_cb, u8x8_msg_cb cad_cb, u8x8_msg_cb byte_cb, u8x8_msg_cb gpio_and_delay_cb)
+{
+  /* setup defaults and reset pins to U8X8_PIN_NONE */
+  u8x8_SetupDefaults(u8x8);
+
+  /* setup specific callbacks */
+  u8x8->display_cb = display_cb;
+  u8x8->cad_cb = cad_cb;
+  u8x8->byte_cb = byte_cb;
+  u8x8->gpio_and_delay_cb = gpio_and_delay_cb;
+
+  /* setup display info */
+  u8x8_SetupMemory(u8x8);
+}
+