text: /**
   * Marlin 3D Printer Firmware
   * Copyright (c) 2021 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
   *
   * Based on Sprinter and grbl.
   * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
   *
   * This program is free software: you can redistribute it and/or modify
   * it under the terms of the GNU General Public License as published by
   * the Free Software Foundation, either version 3 of the License, or
   * (at your option) any later version.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program.  If not, see <https://www.gnu.org/licenses/>.
   *
   */
  #pragma once
  
  void usleep(uint64_t microsec);
  // The following are optional depending on the platform.
  
  // definitions of HAL specific com and device drivers.
  uint8_t u8g_com_sw_spi_fn(u8g_t *u8g, uint8_t msg, uint8_t arg_val, void *arg_ptr);
  uint8_t u8g_com_ST7920_sw_spi_fn(u8g_t *u8g, uint8_t msg, uint8_t arg_val, void *arg_ptr);
  
  // connect U8g com generic com names to the desired driver
  #define U8G_COM_SW_SPI u8g_com_sw_spi_fn
  #define U8G_COM_ST7920_SW_SPI u8g_com_ST7920_sw_spi_fn
  
  // let these default for now
  #define U8G_COM_HW_SPI u8g_com_null_fn
  #define U8G_COM_ST7920_HW_SPI u8g_com_null_fn
  #define U8G_COM_SSD_I2C u8g_com_null_fn
  #define U8G_COM_PARALLEL u8g_com_null_fn
  #define U8G_COM_T6963 u8g_com_null_fn
  #define U8G_COM_FAST_PARALLEL u8g_com_null_fn
  #define U8G_COM_UC_I2C u8g_com_null_fn
  
  
  