text: /**
   * Marlin 3D Printer Firmware
   * Copyright (c) 2020 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
  
  // NOTE - the HAL version of the rrd device uses a generic ST7920 device.  See the
  // file u8g_dev_st7920_128x64_HAL.cpp for the HAL version.
  
  #include "../../inc/MarlinConfig.h"
  #include "../../HAL/shared/Delay.h"
  
  #define ST7920_CLK_PIN  LCD_PINS_D4
  #define ST7920_DAT_PIN  LCD_PINS_ENABLE
  #define ST7920_CS_PIN   LCD_PINS_RS
  
  //#define PAGE_HEIGHT 8   // 128 byte framebuffer
  #define PAGE_HEIGHT 16    // 256 byte framebuffer
  //#define PAGE_HEIGHT 32  // 512 byte framebuffer
  
  #include <U8glib-HAL.h>
  
  void ST7920_SWSPI_SND_8BIT(uint8_t val);
  
  #if DOGM_SPI_DELAY_US > 0
    #define U8G_DELAY() DELAY_US(DOGM_SPI_DELAY_US)
  #else
    #define U8G_DELAY() DELAY_US(10)
  #endif
  
  #define ST7920_CS()              { WRITE(ST7920_CS_PIN, HIGH); U8G_DELAY(); }
  #define ST7920_NCS()             { WRITE(ST7920_CS_PIN, LOW); }
  #define ST7920_SET_CMD()         { ST7920_SWSPI_SND_8BIT(0xF8); U8G_DELAY(); }
  #define ST7920_SET_DAT()         { ST7920_SWSPI_SND_8BIT(0xFA); U8G_DELAY(); }
  #define ST7920_WRITE_BYTE(a)     { ST7920_SWSPI_SND_8BIT((uint8_t)((a)&0xF0u)); ST7920_SWSPI_SND_8BIT((uint8_t)((a)<<4U)); U8G_DELAY(); }
  #define ST7920_WRITE_BYTES(p,l)  { for (uint8_t i = l + 1; --i;) { ST7920_SWSPI_SND_8BIT(*p&0xF0); ST7920_SWSPI_SND_8BIT(*p<<4); p++; } U8G_DELAY(); }
  