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/>.
   *
   */
  
  // 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/MarlinConfigPre.h"
  
  #if !defined(U8G_HAL_LINKS) && ANY(__AVR__, ARDUINO_ARCH_STM32, ARDUINO_ARCH_ESP32)
  
  #include "../../inc/MarlinConfig.h"
  
  #if ENABLED(U8GLIB_ST7920)
  
  #include "ultralcd_st7920_u8glib_rrd_AVR.h"
  
  // Optimize this code with -O3
  #pragma GCC optimize (3)
  
  #ifndef ST7920_DELAY_1
    #ifndef LCD_ST7920_DELAY_1
      #define LCD_ST7920_DELAY_1 0
    #endif
    #ifndef BOARD_ST7920_DELAY_1
      #define BOARD_ST7920_DELAY_1 0
    #endif
    #ifndef CPU_ST7920_DELAY_1
      #define CPU_ST7920_DELAY_1 0
    #endif
    #if LCD_ST7920_DELAY_1 || BOARD_ST7920_DELAY_1 || CPU_ST7920_DELAY_1
      #define ST7920_DELAY_1 DELAY_NS(_MAX(LCD_ST7920_DELAY_1, BOARD_ST7920_DELAY_1, CPU_ST7920_DELAY_1))
    #else
      #define ST7920_DELAY_1
    #endif
  #endif
  #ifndef ST7920_DELAY_2
    #ifndef LCD_ST7920_DELAY_2
      #define LCD_ST7920_DELAY_2 0
    #endif
    #ifndef BOARD_ST7920_DELAY_2
      #define BOARD_ST7920_DELAY_2 0
    #endif
    #ifndef CPU_ST7920_DELAY_2
      #define CPU_ST7920_DELAY_2 0
    #endif
    #if LCD_ST7920_DELAY_2 || BOARD_ST7920_DELAY_2 || CPU_ST7920_DELAY_2
      #define ST7920_DELAY_2 DELAY_NS(_MAX(LCD_ST7920_DELAY_2, BOARD_ST7920_DELAY_2, CPU_ST7920_DELAY_2))
    #else
      #define ST7920_DELAY_2
    #endif
  #endif
  #ifndef ST7920_DELAY_3
    #ifndef LCD_ST7920_DELAY_3
      #define LCD_ST7920_DELAY_3 0
    #endif
    #ifndef BOARD_ST7920_DELAY_3
      #define BOARD_ST7920_DELAY_3 0
    #endif
    #ifndef CPU_ST7920_DELAY_3
      #define CPU_ST7920_DELAY_3 0
    #endif
    #if LCD_ST7920_DELAY_3 || BOARD_ST7920_DELAY_3 || CPU_ST7920_DELAY_3
      #define ST7920_DELAY_3 DELAY_NS(_MAX(LCD_ST7920_DELAY_3, BOARD_ST7920_DELAY_3, CPU_ST7920_DELAY_3))
    #else
      #define ST7920_DELAY_3
    #endif
  #endif
  
  #ifdef ARDUINO_ARCH_STM32F1
    #define ST7920_DAT(V) !!((V) & 0x80)
  #else
    #define ST7920_DAT(V) ((V) & 0x80)
  #endif
  
  #define ST7920_SND_BIT do{ \
    WRITE(ST7920_CLK_PIN, LOW);             ST7920_DELAY_1; \
    WRITE(ST7920_DAT_PIN, ST7920_DAT(val)); ST7920_DELAY_2; \
    WRITE(ST7920_CLK_PIN, HIGH);            ST7920_DELAY_3; \
    val <<= 1; }while(0)
  
  // Optimize this code with -O3
  #pragma GCC optimize (3)
  
  void ST7920_SWSPI_SND_8BIT(uint8_t val) {
    ST7920_SND_BIT; // 1
    ST7920_SND_BIT; // 2
    ST7920_SND_BIT; // 3
    ST7920_SND_BIT; // 4
    ST7920_SND_BIT; // 5
    ST7920_SND_BIT; // 6
    ST7920_SND_BIT; // 7
    ST7920_SND_BIT; // 8
  }
  
  uint8_t u8g_dev_rrd_st7920_128x64_fn(u8g_t *u8g, u8g_dev_t *dev, uint8_t msg, void *arg) {
    uint8_t i, y;
    switch (msg) {
      case U8G_DEV_MSG_INIT: {
        OUT_WRITE(ST7920_CS_PIN, LOW);
        OUT_WRITE(ST7920_DAT_PIN, LOW);
        OUT_WRITE(ST7920_CLK_PIN, HIGH);
  
        ST7920_CS();
        u8g_Delay(120);                 // Initial delay for boot up
        ST7920_SET_CMD();
        ST7920_WRITE_BYTE(0x20);        // Non-extended mode
        ST7920_WRITE_BYTE(0x08);        // Display off, cursor+blink off
        ST7920_WRITE_BYTE(0x01);        // Clear DDRAM ram
        u8g_Delay(15);                  // Delay for DDRAM clear
        ST7920_WRITE_BYTE(0x24);        // Extended mode
        ST7920_WRITE_BYTE(0x26);        // Extended mode + GDRAM active
        for (y = 0; y < (LCD_PIXEL_HEIGHT) / 2; y++) {  // Clear GDRAM
          ST7920_WRITE_BYTE(0x80 | y);  // Set y
          ST7920_WRITE_BYTE(0x80);      // Set x = 0
          ST7920_SET_DAT();
          for (i = 0; i < 2 * (LCD_PIXEL_WIDTH) / 8; i++) // 2x width clears both segments
            ST7920_WRITE_BYTE(0);
          ST7920_SET_CMD();
        }
        ST7920_WRITE_BYTE(0x0C);        // Display on, cursor+blink off
        ST7920_NCS();
      }
      break;
  
      case U8G_DEV_MSG_STOP: break;
  
      case U8G_DEV_MSG_PAGE_NEXT: {
        uint8_t *ptr;
        u8g_pb_t *pb = (u8g_pb_t*)(dev->dev_mem);
        y = pb->p.page_y0;
        ptr = (uint8_t*)pb->buf;
  
        ST7920_CS();
        for (i = 0; i < PAGE_HEIGHT; i ++) {
          ST7920_SET_CMD();
          if (y < 32) {
            ST7920_WRITE_BYTE(0x80 | y);        // y
            ST7920_WRITE_BYTE(0x80);            // x = 0
          }
          else {
            ST7920_WRITE_BYTE(0x80 | (y - 32)); // y
            ST7920_WRITE_BYTE(0x80 | 8);        // x = 64
          }
          ST7920_SET_DAT();
          ST7920_WRITE_BYTES(ptr, (LCD_PIXEL_WIDTH) / 8); // ptr incremented inside of macro!
          y++;
        }
        ST7920_NCS();
      }
      break;
    }
    #if PAGE_HEIGHT == 8
      return u8g_dev_pb8h1_base_fn(u8g, dev, msg, arg);
    #elif PAGE_HEIGHT == 16
      return u8g_dev_pb16h1_base_fn(u8g, dev, msg, arg);
    #else
      return u8g_dev_pb32h1_base_fn(u8g, dev, msg, arg);
    #endif
  }
  
  uint8_t   u8g_dev_st7920_128x64_rrd_buf[(LCD_PIXEL_WIDTH) * (PAGE_HEIGHT) / 8] U8G_NOCOMMON;
  u8g_pb_t  u8g_dev_st7920_128x64_rrd_pb = { { PAGE_HEIGHT, LCD_PIXEL_HEIGHT, 0, 0, 0 }, LCD_PIXEL_WIDTH, u8g_dev_st7920_128x64_rrd_buf };
  u8g_dev_t u8g_dev_st7920_128x64_rrd_sw_spi = { u8g_dev_rrd_st7920_128x64_fn, &u8g_dev_st7920_128x64_rrd_pb, &u8g_com_null_fn };
  
  #pragma GCC reset_options
  
  #if ENABLED(LIGHTWEIGHT_UI)
    #include "../../HAL/shared/HAL_ST7920.h"
    void ST7920_cs()                          { ST7920_CS(); }
    void ST7920_ncs()                         { ST7920_NCS(); }
    void ST7920_set_cmd()                     { ST7920_SET_CMD(); }
    void ST7920_set_dat()                     { ST7920_SET_DAT(); }
    void ST7920_write_byte(const uint8_t val) { ST7920_WRITE_BYTE(val); }
  #endif
  
  #endif // U8GLIB_ST7920
  #endif // !U8G_HAL_LINKS && (__AVR__ || ARDUINO_ARCH_STM32 || ARDUINO_ARCH_ESP32)
  