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/**

 * Lightweight Status Screen for the RepRapDiscount Full

 * Graphics Smart Controller (ST7920-based 128x64 LCD)

 *

 * (c) 2017 Aleph Objects, Inc.

 *

 * The code in this page is free software: you can

 * redistribute it and/or modify it under the terms of the GNU

 * General Public License (GNU GPL) as published by the Free Software

 * Foundation, either version 3 of the License, or (at your option)

 * any later version.  The code is distributed WITHOUT ANY WARRANTY;

 * without even the implied warranty of MERCHANTABILITY or FITNESS

 * FOR A PARTICULAR PURPOSE.  See the GNU GPL for more details.

 *

 */

/**

 * Implementation of a Status Screen for the RepRapDiscount

 * Full Graphics Smart Controller using native ST7920 commands

 * instead of U8Glib.

 *

 * This alternative Status Screen makes use of the built-in character

 * generation capabilities of the ST7920 to update the Status Screen

 * with less SPI traffic and CPU use. In particular:

 *

 *  - The fan and bed animations are handled using custom characters

 *    that are stored in CGRAM. This allows for the animation to be

 *    updated by writing a single character to the text-buffer (DDRAM).

 *

 *  - All the information in the Status Screen is text that is written

 *    to DDRAM, so the work of generating the bitmaps is offloaded to

 *    the ST7920 rather than being render by U8Glib on the MCU.

 *

 *  - The graphics buffer (GDRAM) is only used for static graphics

 *    elements (nozzle and feedrate bitmaps) and for the progress

 *    bar, so updates are sporadic.

 */

#include "status_screen_lite_ST7920_class.h"

#include "duration_t.h"

#define BUFFER_WIDTH   256

#define BUFFER_HEIGHT  32

#define DDRAM_LINE_1   0x00

#define DDRAM_LINE_2   0x10

#define DDRAM_LINE_3   0x08

#define DDRAM_LINE_4   0x18

ST7920_Lite_Status_Screen::st7920_state_t ST7920_Lite_Status_Screen::current_bits;

void ST7920_Lite_Status_Screen::cmd(const uint8_t cmd) {

  if (!current_bits.synced || !current_bits.cmd) {

    current_bits.synced = true;

    current_bits.cmd    = true;

    sync_cmd();

  }

  write_byte(cmd);

}

void ST7920_Lite_Status_Screen::begin_data() {

  if (!current_bits.synced || current_bits.cmd) {

    current_bits.synced = true;

    current_bits.cmd    = false;

    sync_dat();

  }

}

void ST7920_Lite_Status_Screen::write_str(const char *str) {

  while (*str) write_byte(*str++);

}

void ST7920_Lite_Status_Screen::write_str(const char *str, uint8_t len) {

  while (*str && len--) write_byte(*str++);

}

void ST7920_Lite_Status_Screen::write_str_P(const char * const str) {

  const char *p_str = (const char *)str;

  while (char c = pgm_read_byte_near(p_str++)) write_byte(c);

}

void ST7920_Lite_Status_Screen::write_str(progmem_str str) {

  write_str_P((const char*)str);

}

void ST7920_Lite_Status_Screen::write_number(const int16_t value, const uint8_t digits/*=3*/) {

  char str[7];

  const char *fmt;

  switch (digits) {

    case 6: fmt = PSTR("%6d"); break;

    case 5: fmt = PSTR("%5d"); break;

    case 4: fmt = PSTR("%4d"); break;

    case 3: fmt = PSTR("%3d"); break;

    case 2: fmt = PSTR("%2d"); break;

    case 1: fmt = PSTR("%1d"); break;

  }

  sprintf_P(str, fmt, value);

  write_str(str);

}

void ST7920_Lite_Status_Screen::display_status(const bool display_on, const bool cursor_on, const bool blink_on) {

  extended_function_set(false);

  cmd(0b00001000 |

    (display_on ? 0b0100 : 0) |

    (cursor_on  ? 0b0010 : 0) |

    (blink_on   ? 0b0001 : 0)

  );

}

// Sets the extended and graphics bits simultaneously, regardless of

// the current state. This is a helper function for extended_function_set()

// and graphics()

void ST7920_Lite_Status_Screen::_extended_function_set(const bool extended, const bool graphics) {

  cmd(  0b00100000 |

    (extended   ? 0b00000100 : 0) |

    (graphics   ? 0b00000010 : 0)

  );

  current_bits.extended = extended;

  current_bits.graphics = graphics;

}

void ST7920_Lite_Status_Screen::extended_function_set(const bool extended) {

  if (extended != current_bits.extended)

    _extended_function_set(extended, current_bits.graphics);

}

void ST7920_Lite_Status_Screen::graphics(const bool graphics) {

  if (graphics != current_bits.graphics)

    _extended_function_set(current_bits.extended, graphics);

}

void ST7920_Lite_Status_Screen::entry_mode_select(const bool ac_increase, const bool shift) {

  extended_function_set(false);

  cmd(0b00000100 |

    (ac_increase ? 0b00000010 : 0) |

    (shift       ? 0b00000001 : 0)

  );

}

// Sets the sa bit regardless of the current state. This is a helper

// function for scroll_or_addr_select()

void ST7920_Lite_Status_Screen::_scroll_or_addr_select(const bool sa) {

  extended_function_set(true);

  cmd(0b00100010 |

    (sa   ? 0b000001 : 0)

  );

  current_bits.sa = sa;

}

void ST7920_Lite_Status_Screen::scroll_or_addr_select(const bool sa) {

  if (sa != current_bits.sa)

    _scroll_or_addr_select(sa);

}

void ST7920_Lite_Status_Screen::set_ddram_address(const uint8_t addr) {

  extended_function_set(false);

  cmd(0b10000000 | (addr & 0b00111111));

}

void ST7920_Lite_Status_Screen::set_cgram_address(const uint8_t addr) {

  extended_function_set(false);

  cmd(0b01000000 | (addr & 0b00111111));

}

void ST7920_Lite_Status_Screen::set_gdram_address(const uint8_t x, const uint8_t y) {

  extended_function_set(true);

  cmd(0b10000000 | (y & 0b01111111));

  cmd(0b10000000 | (x & 0b00001111));

}

void ST7920_Lite_Status_Screen::clear() {

  extended_function_set(false);

  cmd(0x00000001);

  delay(15);                 //delay for CGRAM clear

}

void ST7920_Lite_Status_Screen::home() {

  extended_function_set(false);

  cmd(0x00000010);

}

/* This fills the entire text buffer with spaces */

void ST7920_Lite_Status_Screen::clear_ddram() {

  set_ddram_address(DDRAM_LINE_1);

  begin_data();

  for (uint8_t i = 64; i--;) write_byte(' ');

}

/* This fills the entire graphics buffer with zeros */

void ST7920_Lite_Status_Screen::clear_gdram() {

  for (uint8_t y = 0; y < BUFFER_HEIGHT; y++) {

    set_gdram_address(0, y);

    begin_data();

    for (uint8_t i = (BUFFER_WIDTH) / 16; i--;) write_word(0);

  }

}

void ST7920_Lite_Status_Screen::load_cgram_icon(const uint16_t addr, const void *data) {

  const uint16_t *p_word = (const uint16_t *)data;

  set_cgram_address(addr);

  begin_data();

  for (uint8_t i = 16; i--;)

    write_word(pgm_read_word_near(p_word++));

}

/**

 * Draw an icon in GDRAM. Position specified in DDRAM

 * coordinates. i.e., X from 1 to 8, Y from 1 to 4.

 */

void ST7920_Lite_Status_Screen::draw_gdram_icon(uint8_t x, uint8_t y, const void *data) {

  const uint16_t *p_word = (const uint16_t *)data;

  if (y > 2) { // Handle display folding

    y -= 2;

    x += 8;

  }

  --x;

  --y;

  for (int i = 0; i < 16; i++) {

    set_gdram_address(x, i + y * 16);

    begin_data();

    write_word(pgm_read_word_near(p_word++));

  }

}

/************************** ICON DEFINITIONS *************************************/

#define CGRAM_ICON_1_ADDR 0x00

#define CGRAM_ICON_2_ADDR 0x10

#define CGRAM_ICON_3_ADDR 0x20

#define CGRAM_ICON_4_ADDR 0x30

#define CGRAM_ICON_1_WORD 0x00

#define CGRAM_ICON_2_WORD 0x02

#define CGRAM_ICON_3_WORD 0x04

#define CGRAM_ICON_4_WORD 0x06

const uint8_t degree_symbol_y_top = 1;

PROGMEM const uint8_t degree_symbol[] = {

  0b00110000,

  0b01001000,

  0b01001000,

  0b00110000,

};

const uint16_t nozzle_icon[] PROGMEM = {

  0b0000000000000000,

  0b0000000000000000,

  0b0000111111110000,

  0b0001111111111000,

  0b0001111111111000,

  0b0001111111111000,

  0b0000111111110000,

  0b0000111111110000,

  0b0001111111111000,

  0b0001111111111000,

  0b0001111111111000,

  0b0000011111100000,

  0b0000001111000000,

  0b0000000110000000,

  0b0000000000000000,

  0b0000000000000000

};

const uint16_t bed_icon[] PROGMEM = {

  0b0000000000000000,

  0b0000000000000000,

  0b0000000000000000,

  0b0000000000000000,

  0b0000000000000000,

  0b0000000000000000,

  0b0000000000000000,

  0b0000000000000000,

  0b0000000000000000,

  0b0000000000000000,

  0b0000000000000000,

  0b0111111111111110,

  0b0111111111111110,

  0b0110000000000110,

  0b0000000000000000,

  0b0000000000000000

};

const uint16_t heat1_icon[] PROGMEM = {

  0b0000000000000000,

  0b0010001000100000,

  0b0001000100010000,

  0b0000100010001000,

  0b0000100010001000,

  0b0001000100010000,

  0b0010001000100000,

  0b0010001000100000,

  0b0001000100010000,

  0b0000100010001000,

  0b0000000000000000,

  0b0000000000000000,

  0b0000000000000000,

  0b0000000000000000,

  0b0000000000000000,

  0b0000000000000000

};

const uint16_t heat2_icon[] PROGMEM = {

  0b0000000000000000,

  0b0000100010001000,

  0b0000100010001000,

  0b0001000100010000,

  0b0010001000100000,

  0b0010001000100000,

  0b0001000100010000,

  0b0000100010001000,

  0b0000100010001000,

  0b0001000100010000,

  0b0000000000000000,

  0b0000000000000000,

  0b0000000000000000,

  0b0000000000000000,

  0b0000000000000000,

  0b0000000000000000

};

const uint16_t fan1_icon[] PROGMEM = {

  0b0000000000000000,

  0b0111111111111110,

  0b0111000000001110,

  0b0110001111000110,

  0b0100001111000010,

  0b0100000110000010,

  0b0101100000011010,

  0b0101110110111010,

  0b0101100000011010,

  0b0100000110000010,

  0b0100001111000010,

  0b0110001111000110,

  0b0111000000001110,

  0b0111111111111110,

  0b0000000000000000,

  0b0000000000000000

};

const uint16_t fan2_icon[] PROGMEM = {

  0b0000000000000000,

  0b0111111111111110,

  0b0111000000001110,

  0b0110010000100110,

  0b0100111001110010,

  0b0101111001111010,

  0b0100110000110010,

  0b0100000110000010,

  0b0100110000110010,

  0b0101111001111010,

  0b0100111001110010,

  0b0110010000100110,

  0b0111000000001110,

  0b0111111111111110,

  0b0000000000000000,

  0b0000000000000000

};

const uint16_t feedrate_icon[] PROGMEM = {

  0b0000000000000000,

  0b0111111000000000,

  0b0110000000000000,

  0b0110000000000000,

  0b0110000000000000,

  0b0111111011111000,

  0b0110000011001100,

  0b0110000011001100,

  0b0110000011001100,

  0b0110000011111000,

  0b0000000011001100,

  0b0000000011001100,

  0b0000000011001100,

  0b0000000011001100,

  0b0000000000000000,

  0b0000000000000000

};

/************************** MAIN SCREEN *************************************/

// The ST7920 does not have a degree character, but we

// can fake it by writing it to GDRAM.

// This function takes as an argument character positions

// i.e x is [1-16], while the y position is [1-4]

void ST7920_Lite_Status_Screen::draw_degree_symbol(uint8_t x, uint8_t y, bool draw) {

  const uint8_t *p_bytes = degree_symbol;

    if (y > 2) {

      // Handle display folding

      y -= 2;

      x += 16;

    }

    x -= 1;

    y -= 1;

    const bool    oddChar = x & 1;

    const uint8_t x_word  = x >> 1;

    const uint8_t y_top   = degree_symbol_y_top;

    const uint8_t y_bot   = y_top + sizeof(degree_symbol)/sizeof(degree_symbol[0]);

    for (uint8_t i = y_top; i < y_bot; i++) {

      uint8_t byte = pgm_read_byte_near(p_bytes++);

      set_gdram_address(x_word,i+y*16);

      begin_data();

      if (draw) {

        write_byte(oddChar ? 0x00 : byte);

        write_byte(oddChar ? byte : 0x00);

      }

      else

        write_word(0x0000);

    }

}

void ST7920_Lite_Status_Screen::draw_static_elements() {

  scroll_or_addr_select(0);

  // Load the animated bed and fan icons

  load_cgram_icon(CGRAM_ICON_1_ADDR, heat1_icon);

  load_cgram_icon(CGRAM_ICON_2_ADDR, heat2_icon);

  load_cgram_icon(CGRAM_ICON_3_ADDR, fan1_icon);

  load_cgram_icon(CGRAM_ICON_4_ADDR, fan2_icon);

  // Draw the static icons in GDRAM

  draw_gdram_icon(1, 1, nozzle_icon);

  #if HOTENDS > 1

    draw_gdram_icon(1,2,nozzle_icon);

    draw_gdram_icon(1,3,bed_icon);

  #else

    draw_gdram_icon(1,2,bed_icon);

  #endif

  draw_gdram_icon(6,2,feedrate_icon);

  // Draw the initial fan icon

  draw_fan_icon(false);

}

/**

 * Although this is undocumented, the ST7920 allows the character

 * data buffer (DDRAM) to be used in conjunction with the graphics

 * bitmap buffer (CGRAM). The contents of the graphics buffer is

 * XORed with the data from the character generator. This allows

 * us to make the progess bar out of graphical data (the bar) and

 * text data (the percentage).

 */

void ST7920_Lite_Status_Screen::draw_progress_bar(const uint8_t value) {

  #if HOTENDS == 1

    // If we have only one extruder, draw a long progress bar on the third line

    const uint8_t top     = 1,         // Top in pixels

                  bottom  = 13,        // Bottom in pixels

                  left    = 12,        // Left edge, in 16-bit words

                  width   = 4;         // Width of progress bar, in 16-bit words

  #else

    const uint8_t top     = 16 + 1,

                  bottom  = 16 + 13,

                  left    = 5,

                  width   = 3;

  #endif

  const uint8_t char_pcnt  = 100 / width; // How many percent does each 16-bit word represent?

  // Draw the progress bar as a bitmap in CGRAM

  for (uint8_t y = top; y <= bottom; y++) {

    set_gdram_address(left, y);

    begin_data();

    for (uint8_t x = 0; x < width; x++) {

      uint16_t gfx_word = 0x0000;

      if ((x + 1) * char_pcnt <= value)

        gfx_word = 0xFFFF;                                              // Draw completely filled bytes

      else if ((x * char_pcnt) < value)

        gfx_word = int(0x8000) >> (value % char_pcnt) * 16 / char_pcnt; // Draw partially filled bytes

      // Draw the frame around the progress bar

      if (y == top || y == bottom)

        gfx_word = 0xFFFF;        // Draw top/bottom border

      else if (x == width - 1)

        gfx_word |= 0x0001;       // Draw right border

      else if (x == 0)

        gfx_word |= 0x8000;       // Draw left border

      write_word(gfx_word);

    }

  }

  // Draw the percentage as text in DDRAM

  #if HOTENDS == 1

    set_ddram_address(DDRAM_LINE_3 + 4);

    begin_data();

    write_byte(' ');

  #else

    set_ddram_address(DDRAM_LINE_2 + left);

    begin_data();

  #endif

  // Draw centered

  if (value > 9) {

    write_number(value, 4);

    write_str(F("% "));

  }

  else {

    write_number(value, 3);

    write_str(F("%  "));

  }

}

void ST7920_Lite_Status_Screen::draw_fan_icon(const bool whichIcon) {

  set_ddram_address(DDRAM_LINE_1 + 5);

  begin_data();

  write_word(whichIcon ? CGRAM_ICON_3_WORD : CGRAM_ICON_4_WORD);

}

void ST7920_Lite_Status_Screen::draw_heat_icon(const bool whichIcon, const bool heating) {

  set_ddram_address(

    #if HOTENDS == 1

      DDRAM_LINE_2

    #else

      DDRAM_LINE_3

    #endif

  );

  begin_data();

  if (heating)

    write_word(whichIcon ? CGRAM_ICON_1_WORD : CGRAM_ICON_2_WORD);

  else {

    write_byte(' ');

    write_byte(' ');

  }

}

#define FAR(a,b) (((a > b) ? (a-b) : (b-a)) > 2)

static struct {

  bool E1_show_target  : 1;

  bool E2_show_target  : 1;

  #if HAS_HEATED_BED

    bool bed_show_target : 1;

  #endif

} display_state = {

  true, true

  #if HAS_HEATED_BED

    , true

  #endif

};

void ST7920_Lite_Status_Screen::draw_temps(uint8_t line, const int16_t temp, const int16_t target, bool showTarget, bool targetStateChange) {

  switch (line) {

    case 1: set_ddram_address(DDRAM_LINE_1 + 1); break;

    case 2: set_ddram_address(DDRAM_LINE_2 + 1); break;

    case 3: set_ddram_address(DDRAM_LINE_3 + 1); break;

    case 4: set_ddram_address(DDRAM_LINE_3 + 1); break;

  }

  begin_data();

  write_number(temp);

  if (showTarget) {

    write_str(F("\x1A"));

    write_number(target);

  };

  if (targetStateChange) {

    if (!showTarget) write_str(F("    "));

    draw_degree_symbol(6,  line, !showTarget);

    draw_degree_symbol(10, line, showTarget);

  }

}

void ST7920_Lite_Status_Screen::draw_extruder_1_temp(const int16_t temp, const int16_t target, bool forceUpdate) {

  const bool show_target = target && FAR(temp, target);

  draw_temps(1, temp, target, show_target, display_state.E1_show_target != show_target || forceUpdate);

  display_state.E1_show_target = show_target;

}

void ST7920_Lite_Status_Screen::draw_extruder_2_temp(const int16_t temp, const int16_t target, bool forceUpdate) {

  const bool show_target = target && FAR(temp, target);

  draw_temps(2, temp, target, show_target, display_state.E2_show_target != show_target || forceUpdate);

  display_state.E2_show_target = show_target;

}

#if HAS_HEATED_BED

  void ST7920_Lite_Status_Screen::draw_bed_temp(const int16_t temp, const int16_t target, bool forceUpdate) {

    const bool show_target = target && FAR(temp, target);

    draw_temps(2

      #if HOTENDS > 1

        + 1

      #endif

      , temp, target, show_target, display_state.bed_show_target != show_target || forceUpdate

    );

    display_state.bed_show_target = show_target;

  }

#endif

void ST7920_Lite_Status_Screen::draw_fan_speed(const uint8_t value) {

  set_ddram_address(DDRAM_LINE_1 + 6);

  begin_data();

  write_number(value, 3);

  write_byte('%');

}

void ST7920_Lite_Status_Screen::draw_print_time(const duration_t &elapsed) {

  #if HOTENDS == 1

    set_ddram_address(DDRAM_LINE_3);

  #else

    set_ddram_address(DDRAM_LINE_3 + 5);

  #endif

  char str[7];

  str[elapsed.toDigital(str)] = ' ';

  begin_data();

  write_str(str, 6);

}

void ST7920_Lite_Status_Screen::draw_feedrate_percentage(const uint8_t percentage) {

  // We only have enough room for the feedrate when

  // we have one extruder

  #if HOTENDS == 1

    set_ddram_address(DDRAM_LINE_2 + 6);

    begin_data();

    write_number(percentage, 3);

    write_byte('%');

  #endif

}

void ST7920_Lite_Status_Screen::draw_status_message(const char *str) {

  set_ddram_address(DDRAM_LINE_4);

  begin_data();

  const uint8_t lcd_len = 16;

  #if ENABLED(STATUS_MESSAGE_SCROLLING)

    uint8_t slen = utf8_strlen(str);

    // If the string fits into the LCD, just print it and do not scroll it

    if (slen <= lcd_len) {

      // The string isn't scrolling and may not fill the screen

      write_str(str);

      // Fill the rest with spaces

      while (slen < lcd_len) {

        write_byte(' ');

        ++slen;

      }

    }

    else {

      // String is larger than the available space in screen.

      // Get a pointer to the next valid UTF8 character

      const char *stat = str + status_scroll_offset;

      // Get the string remaining length

      const uint8_t rlen = utf8_strlen(stat);

      // If we have enough characters to display

      if (rlen >= lcd_len) {

        // The remaining string fills the screen - Print it

        write_str(stat, lcd_len);

      }

      else {

        // The remaining string does not completely fill the screen

        write_str(stat);                        // The string leaves space

        uint8_t chars = lcd_len - rlen;         // Amount of space left in characters

        write_byte('.');                        // Always at 1+ spaces left, draw a dot

        if (--chars) {                          // Draw a second dot if there's space

          write_byte('.');

          if (--chars)

            write_str(str, chars);              // Print a second copy of the message

        }

      }

      // Adjust by complete UTF8 characters

      if (status_scroll_offset < slen) {

        status_scroll_offset++;

        while (!START_OF_UTF8_CHAR(str[status_scroll_offset]))

          status_scroll_offset++;

      }

      else

        status_scroll_offset = 0;

    }

  #else

    // Get the UTF8 character count of the string

    uint8_t slen = utf8_strlen(str);

    // Just print the string to the LCD

    write_str(str, lcd_len);

    // Fill the rest with spaces if there are missing spaces

    while (slen < lcd_len) {

      write_byte(' ');

      ++slen;

    }

  #endif

}

void ST7920_Lite_Status_Screen::draw_position(const float x, const float y, const float z, bool position_known) {

  char str[7];

  set_ddram_address(DDRAM_LINE_4);

  begin_data();

  // If position is unknown, flash the labels.

  const unsigned char alt_label = position_known ? 0 : (lcd_blink() ? ' ' : 0);

  dtostrf(x, -4, 0, str);

  write_byte(alt_label ? alt_label : 'X');

  write_str(str, 4);

  dtostrf(y, -4, 0, str);

  write_byte(alt_label ? alt_label : 'Y');

  write_str(str, 4);

  dtostrf(z, -5, 1, str);

  write_byte(alt_label ? alt_label : 'Z');

  write_str(str, 5);

}

bool ST7920_Lite_Status_Screen::indicators_changed() {

  // We only add the target temperatures to the checksum

  // because the actual temps fluctuate so by updating

  // them only during blinks we gain a bit of stability.

  const bool       blink             = lcd_blink();

  const uint8_t    feedrate_perc     = feedrate_percentage;

  const uint8_t    fan_speed         = ((fanSpeeds[0] + 1) * 100) / 256;

  const int16_t    extruder_1_target = thermalManager.degTargetHotend(0);

  #if HOTENDS > 1

    const int16_t  extruder_2_target = thermalManager.degTargetHotend(1);

  #endif

  #if HAS_HEATED_BED

    const int16_t  bed_target        = thermalManager.degTargetBed();

  #endif

  static uint16_t last_checksum = 0;

  const uint16_t checksum = blink ^ feedrate_perc ^ fan_speed ^ extruder_1_target

    #if HOTENDS > 1

      ^ extruder_2_target

    #endif

    #if HAS_HEATED_BED

      ^ bed_target

    #endif

  ;

  if (last_checksum == checksum) return false;

  last_checksum = checksum;

  return true;

}

void ST7920_Lite_Status_Screen::update_indicators(const bool forceUpdate) {

  if (forceUpdate || indicators_changed()) {

    const bool       blink             = lcd_blink();

    const duration_t elapsed           = print_job_timer.duration();

    const uint8_t    feedrate_perc     = feedrate_percentage;

    const uint8_t    fan_speed         = ((fanSpeeds[0] + 1) * 100) / 256;

    const int16_t    extruder_1_temp   = thermalManager.degHotend(0),

                     extruder_1_target = thermalManager.degTargetHotend(0);

    #if HOTENDS > 1

      const int16_t  extruder_2_temp   = thermalManager.degHotend(1),

                     extruder_2_target = thermalManager.degTargetHotend(1);

    #endif

    #if HAS_HEATED_BED

      const int16_t  bed_temp          = thermalManager.degBed(),

                     bed_target        = thermalManager.degTargetBed();

    #endif

    draw_extruder_1_temp(extruder_1_temp, extruder_1_target, forceUpdate);

    #if HOTENDS > 1

      draw_extruder_2_temp(extruder_2_temp, extruder_2_target, forceUpdate);

    #endif

    #if HAS_HEATED_BED

      draw_bed_temp(bed_temp, bed_target, forceUpdate);

    #endif

    draw_fan_speed(fan_speed);

    draw_print_time(elapsed);

    draw_feedrate_percentage(feedrate_perc);

    // Update the fan and bed animations

    if (fan_speed > 0) draw_fan_icon(blink);

    #if HAS_HEATED_BED

      if (bed_target > 0)

        draw_heat_icon(blink, true);

      else

        draw_heat_icon(false, false);

    #endif

  }

}

bool ST7920_Lite_Status_Screen::position_changed() {

  const float x_pos = current_position[X_AXIS],

              y_pos = current_position[Y_AXIS],

              z_pos = current_position[Z_AXIS];

  const uint8_t checksum = uint8_t(x_pos) ^ uint8_t(y_pos) ^ uint8_t(z_pos);

  static uint8_t last_checksum = 0;

  if (last_checksum == checksum) return false;

  last_checksum = checksum;

  return true;

}

bool ST7920_Lite_Status_Screen::status_changed() {

  uint8_t checksum = 0;

  for (const char *p = lcd_status_message; *p; p++) checksum ^= *p;

  static uint8_t last_checksum = 0;

  if (last_checksum == checksum) return false;

  last_checksum = checksum;

  return true;

}

bool ST7920_Lite_Status_Screen::blink_changed() {

  static uint8_t last_blink = 0;

  const bool blink = lcd_blink();

  if (last_blink == blink) return false;

  last_blink = blink;

  return true;

}

#ifndef STATUS_EXPIRE_SECONDS

  #define STATUS_EXPIRE_SECONDS 20

#endif

void ST7920_Lite_Status_Screen::update_status_or_position(bool forceUpdate) {

  #if STATUS_EXPIRE_SECONDS

    static uint8_t countdown = 0;

  #endif

  /**

   * There is only enough room in the display for either the

   * status message or the position, not both, so we choose

   * one or another. Whenever the status message changes,

   * we show it for a number of consecutive seconds, but

   * then go back to showing the position as soon as the

   * head moves, i.e:

   *

   *    countdown > 1    -- Show status

   *    countdown = 1    -- Show status, until movement

   *    countdown = 0    -- Show position

   *

   * If STATUS_EXPIRE_SECONDS is zero, the position display

   * will be disabled and only the status will be shown.

   */

  if (forceUpdate || status_changed()) {

    #if ENABLED(STATUS_MESSAGE_SCROLLING)

      status_scroll_offset = 0;

    #endif

    #if STATUS_EXPIRE_SECONDS

      countdown = lcd_status_message[0] ? STATUS_EXPIRE_SECONDS : 0;

    #endif

    draw_status_message(lcd_status_message);

    blink_changed(); // Clear changed flag

  }

  #if !STATUS_EXPIRE_SECONDS

    #if ENABLED(STATUS_MESSAGE_SCROLLING)

      else

        draw_status_message(lcd_status_message);

    #endif

  #else

    else if (countdown > 1 && blink_changed()) {

      countdown--;

      #if ENABLED(STATUS_MESSAGE_SCROLLING)

        draw_status_message(lcd_status_message);

      #endif

    }

    else if (countdown > 0 && blink_changed()) {

      if (position_changed()) {

        countdown--;

        forceUpdate = true;

      }

      #if ENABLED(STATUS_MESSAGE_SCROLLING)

        draw_status_message(lcd_status_message);

      #endif

    }

    if (countdown == 0 && (forceUpdate || position_changed() ||

      #if DISABLED(DISABLE_REDUCED_ACCURACY_WARNING)

        blink_changed()

      #endif

    )) {

      draw_position(

        current_position[X_AXIS],

        current_position[Y_AXIS],

        current_position[Z_AXIS],

        #if ENABLED(DISABLE_REDUCED_ACCURACY_WARNING)

          true

        #else

          all_axes_known()

        #endif

      );

    }

  #endif

}

void ST7920_Lite_Status_Screen::update_progress(const bool forceUpdate) {

  #if ENABLED(LCD_SET_PROGRESS_MANUALLY) || ENABLED(SDSUPPORT)

    #if DISABLED(LCD_SET_PROGRESS_MANUALLY)

      uint8_t progress_bar_percent = 0;

    #endif

    #if ENABLED(SDSUPPORT)

      // Progress bar % comes from SD when actively printing

      if (IS_SD_PRINTING()) progress_bar_percent = card.percentDone();

    #endif

    // Since the progress bar involves writing

    // quite a few bytes to GDRAM, only do this

    // when an update is actually necessary.

    static uint8_t last_progress = 0;

    if (!forceUpdate && last_progress == progress_bar_percent) return;

    last_progress = progress_bar_percent;

    draw_progress_bar(progress_bar_percent);

  #else

    UNUSED(forceUpdate);

  #endif // LCD_SET_PROGRESS_MANUALLY || SDSUPPORT

}

void ST7920_Lite_Status_Screen::update(const bool forceUpdate) {

  cs();

  update_indicators(forceUpdate);

  update_status_or_position(forceUpdate);

  update_progress(forceUpdate);

  ncs();

}

void ST7920_Lite_Status_Screen::reset_state_from_unknown() {

  _extended_function_set(true, true); // Do it twice as only one bit

  _extended_function_set(true, true); // get set at a time.

  _scroll_or_addr_select(false);

}

void ST7920_Lite_Status_Screen::on_entry() {

  cs();

  reset_state_from_unknown();

  clear();

  clear_gdram();

  draw_static_elements();

  update(true);

  ncs();

}

void ST7920_Lite_Status_Screen::on_exit() {

  cs();

  clear();

  _extended_function_set(true, true); // Restore state to what u8g expects.

  ncs();

}

// This is called prior to the KILL screen to

// clear the screen so we don't end up with a

// garbled display.

void ST7920_Lite_Status_Screen::clear_text_buffer() {

  cs();

  reset_state_from_unknown();

  clear();

  _extended_function_set(true, true); // Restore state to what u8g expects.

  ncs();

}

static void lcd_implementation_status_screen() {

  ST7920_Lite_Status_Screen::update(false);

}

/**

 * In order to properly update the lite Status Screen,

 * we must know when we have entered and left the

 * Status Screen. Since the ultralcd code is not

 * set up for doing this, we call this function before

 * each update indicating whether the current screen

 * is the Status Screen.

 *

 * This function keeps track of whether we have left or

 * entered the Status Screen and calls the on_entry()

 * and on_exit() methods for cleanup.

 */

static void lcd_in_status(const bool inStatus) {

  static bool lastInStatus = false;

  if (lastInStatus == inStatus) return;

  if ((lastInStatus = inStatus))

    ST7920_Lite_Status_Screen::on_entry();

  else

    ST7920_Lite_Status_Screen::on_exit();

}