diff --git a/libraries/u8glib/u8g_state.c b/libraries/u8glib/u8g_state.c
deleted file mode 100644
--- a/libraries/u8glib/u8g_state.c
+++ /dev/null
@@ -1,150 +0,0 @@
-/*
-
-  u8g_state.c
-  
-  backup and restore hardware state
-
-  Universal 8bit Graphics Library
-  
-  Copyright (c) 2011, 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.  
-  
-
-  state callback: backup env U8G_STATE_MSG_BACKUP_ENV
-  device callback: DEV_MSG_INIT
-  state callback: backup u8g U8G_STATE_MSG_BACKUP_U8G
-  state callback: restore env U8G_STATE_MSG_RESTORE_ENV
-
-  state callback: backup env U8G_STATE_MSG_BACKUP_ENV
-  state callback: retore u8g U8G_STATE_MSG_RESTORE_U8G
-  DEV_MSG_PAGE_FIRST or DEV_MSG_PAGE_NEXT
-  state callback: restore env U8G_STATE_MSG_RESTORE_ENV
-
-*/
-
-#include <stddef.h>
-#include "u8g.h"
-
-void u8g_state_dummy_cb(uint8_t msg)
-{
-  /* the dummy procedure does nothing */
-}
-
-void u8g_SetHardwareBackup(u8g_t *u8g, u8g_state_cb backup_cb)
-{
-  u8g->state_cb = backup_cb;
-  /* in most cases the init message was already sent, so this will backup the */
-  /* current u8g state */
-  backup_cb(U8G_STATE_MSG_BACKUP_U8G);
-}
-
-
-/*===============================================================*/
-/* register variable for restoring interrupt state */
-
-#if defined(__AVR__)
-uint8_t global_SREG_backup;
-#endif
-
-
-
-/*===============================================================*/
-/* AVR */
-
-#if defined(__AVR__)
-#define U8G_ATMEGA_HW_SPI
-
-/* remove the definition for attiny */
-#if __AVR_ARCH__ == 2
-#undef U8G_ATMEGA_HW_SPI
-#endif
-#if __AVR_ARCH__ == 25
-#undef U8G_ATMEGA_HW_SPI
-#endif
-#endif
-
-#if defined(U8G_ATMEGA_HW_SPI)
-#include <avr/interrupt.h>
-static uint8_t u8g_state_avr_spi_memory[2];
-
-void u8g_backup_spi(uint8_t msg)
-{
-  if ( U8G_STATE_MSG_IS_BACKUP(msg) )
-  {
-    u8g_state_avr_spi_memory[U8G_STATE_MSG_GET_IDX(msg)] = SPCR;
-  }
-  else
-  {
-    uint8_t tmp = SREG;
-    cli();
-    SPCR = 0;
-    SPCR = u8g_state_avr_spi_memory[U8G_STATE_MSG_GET_IDX(msg)];
-    SREG = tmp;
-  }
-}
-
-#elif defined(ARDUINO) && defined(__SAM3X8E__)		// Arduino Due, maybe we should better check for __SAM3X8E__
-
-#include "sam.h"
-
-struct sam_backup_struct
-{
-  uint32_t mr;
-  uint32_t sr;
-  uint32_t csr[4];  
-} sam_backup[2];
-
-void u8g_backup_spi(uint8_t msg)
-{
-  uint8_t idx = U8G_STATE_MSG_GET_IDX(msg);
-  if ( U8G_STATE_MSG_IS_BACKUP(msg) )
-  {
-    sam_backup[idx].mr = SPI0->SPI_MR;
-    sam_backup[idx].sr = SPI0->SPI_SR;
-    sam_backup[idx].csr[0] = SPI0->SPI_CSR[0];
-    sam_backup[idx].csr[1] = SPI0->SPI_CSR[1];
-    sam_backup[idx].csr[2] = SPI0->SPI_CSR[2];
-    sam_backup[idx].csr[3] = SPI0->SPI_CSR[3];
-  }
-  else
-  {
-    SPI0->SPI_MR = sam_backup[idx].mr;
-    SPI0->SPI_CSR[0] = sam_backup[idx].csr[0];
-    SPI0->SPI_CSR[1] = sam_backup[idx].csr[1];
-    SPI0->SPI_CSR[2] = sam_backup[idx].csr[2];
-    SPI0->SPI_CSR[3] = sam_backup[idx].csr[3];
-  }
-}
-
-#else
-
-void u8g_backup_spi(uint8_t msg)
-{
-}
-
-#endif
-