Initial commit

1 files changed, 917 insertions, 0 deletions

diff --git a/Marlin/src/lcd/dogm/status_screen_lite_ST7920.cpp b/Marlin/src/lcd/dogm/status_screen_lite_ST7920.cpp
new file mode 100644
index 0000000..a538121
--- /dev/null
+++ b/Marlin/src/lcd/dogm/status_screen_lite_ST7920.cpp
@@ -0,0 +1,917 @@
+/**
+ * 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.
+ */
+
+//
+// status_screen_lite_ST7920.cpp
+// Lightweight Status Screen for Graphical Display
+//
+
+#include "../../inc/MarlinConfigPre.h"
+
+#if ENABLED(LIGHTWEIGHT_UI)
+
+#include "status_screen_lite_ST7920.h"
+
+#include "../marlinui.h"
+#include "../fontutils.h"
+#include "../lcdprint.h"
+#include "../../libs/duration_t.h"
+#include "../../module/motion.h"
+#include "../../module/printcounter.h"
+#include "../../module/temperature.h"
+
+#if ENABLED(SDSUPPORT)
+  #include "../../sd/cardreader.h"
+#endif
+
+#if ENABLED(LCD_SHOW_E_TOTAL)
+  #include "../../MarlinCore.h" // for printingIsActive
+#endif
+
+#define TEXT_MODE_LCD_WIDTH 16
+
+#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(PGM_P const str) {
+  PGM_P p_str = (PGM_P)str;
+  while (char c = pgm_read_byte(p_str++)) write_byte(c);
+}
+
+void ST7920_Lite_Status_Screen::write_number(const int16_t value, const uint8_t digits/*=3*/) {
+  char str[7];
+  PGM_P 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;
+    default: return;
+  }
+  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(0b00000010 | (sa ? 0b00000001 : 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() {
+  LOOP_L_N(y, BUFFER_HEIGHT) {
+    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(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;
+  // Handle display folding
+  if (y > 1) y -= 2, x += 8;
+  for (int i = 0; i < 16; i++) {
+    set_gdram_address(x, i + y * 16);
+    begin_data();
+    write_word(pgm_read_word(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 has no degree character, so draw it to GDRAM.
+ * This function takes character position xy
+ * i.e., x is [0-15], while the y position is [0-3]
+ */
+void ST7920_Lite_Status_Screen::draw_degree_symbol(uint8_t x, uint8_t y, const bool draw) {
+  const uint8_t *p_bytes = degree_symbol;
+    // Handle display folding
+    if (y > 1) y -= 2, x += 16;
+    const bool    oddChar = x & 1;
+    const uint8_t x_word  = x >> 1,
+                  y_top   = degree_symbol_y_top,
+                  y_bot   = y_top + COUNT(degree_symbol);
+    LOOP_S_L_N(i, y_top, y_bot) {
+      uint8_t byte = pgm_read_byte(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(0, 0, nozzle_icon);
+  #if HAS_MULTI_HOTEND
+    draw_gdram_icon(0, 1, nozzle_icon);
+    draw_gdram_icon(0, 2, bed_icon);
+  #else
+    draw_gdram_icon(0, 1, bed_icon);
+  #endif
+  draw_gdram_icon(5, 1, 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
+    constexpr 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
+    constexpr 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
+  LOOP_S_LE_N(y, top, bottom) {
+    set_gdram_address(left, y);
+    begin_data();
+    LOOP_L_N(x, width) {
+      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_P(PSTR("% "));
+  }
+  else {
+    write_number(value, 3);
+    write_str_P(PSTR("%  "));
+  }
+}
+
+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;
+  TERN_(HAS_HEATED_BED, bool bed_show_target : 1);
+} display_state = {
+  true, true, TERN_(HAS_HEATED_BED, true)
+};
+
+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 0: set_ddram_address(DDRAM_LINE_1 + 1); break;
+    case 1: set_ddram_address(DDRAM_LINE_2 + 1); break;
+    case 2: set_ddram_address(DDRAM_LINE_3 + 1); break;
+    case 3: set_ddram_address(DDRAM_LINE_3 + 1); break;
+  }
+  begin_data();
+  write_number(temp);
+
+  if (showTarget) {
+    write_byte('\x1A');
+    write_number(target);
+  };
+
+  if (targetStateChange) {
+    if (!showTarget) write_str_P(PSTR("    "));
+    draw_degree_symbol(5, line, !showTarget);
+    draw_degree_symbol(9, 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(0, 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(1, 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(TERN(HAS_MULTI_HOTEND, 2, 1), 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, char suffix) {
+  #if HOTENDS == 1
+    set_ddram_address(DDRAM_LINE_3);
+  #else
+    set_ddram_address(DDRAM_LINE_3 + 5);
+  #endif
+  char str[7];
+  int str_length = elapsed.toDigital(str);
+  str[str_length++] = suffix;
+  begin_data();
+  write_str(str, str_length);
+}
+
+void ST7920_Lite_Status_Screen::draw_feedrate_percentage(const uint16_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('%');
+  #else
+    UNUSED(percentage);
+  #endif
+}
+
+void ST7920_Lite_Status_Screen::draw_status_message() {
+  const char *str = ui.status_message;
+
+  set_ddram_address(DDRAM_LINE_4);
+  begin_data();
+  #if ENABLED(STATUS_MESSAGE_SCROLLING)
+    uint8_t slen = utf8_strlen(str);
+
+    if (slen <= TEXT_MODE_LCD_WIDTH) {
+      // String fits the LCD, so just print it
+      write_str(str);
+      while (slen < TEXT_MODE_LCD_WIDTH) { write_byte(' '); ++slen; }
+    }
+    else {
+      // String is larger than the available space in screen.
+
+      // Get a pointer to the next valid UTF8 character
+      // and the string remaining length
+      uint8_t rlen;
+      const char *stat = ui.status_and_len(rlen);
+      write_str(stat, TEXT_MODE_LCD_WIDTH);
+
+      // If the remaining string doesn't completely fill the screen
+      if (rlen < TEXT_MODE_LCD_WIDTH) {
+        write_byte('.');                        // Always at 1+ spaces left, draw a dot
+        uint8_t chars = TEXT_MODE_LCD_WIDTH - rlen;       // Amount of space left in characters
+        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
+        }
+      }
+      ui.advance_status_scroll();
+    }
+
+  #else
+
+    uint8_t slen = utf8_strlen(str);
+    write_str(str, TEXT_MODE_LCD_WIDTH);
+    for (; slen < TEXT_MODE_LCD_WIDTH; ++slen) write_byte(' ');
+
+  #endif
+}
+
+void ST7920_Lite_Status_Screen::draw_position(const xyze_pos_t &pos, const bool position_trusted) {
+  char str[7];
+  set_ddram_address(DDRAM_LINE_4);
+  begin_data();
+
+  // If position is unknown, flash the labels.
+  const unsigned char alt_label = position_trusted ? 0 : (ui.get_blink() ? ' ' : 0);
+
+  if (TERN1(LCD_SHOW_E_TOTAL, !printingIsActive())) {
+    write_byte(alt_label ? alt_label : 'X');
+    write_str(dtostrf(pos.x, -4, 0, str), 4);
+
+    write_byte(alt_label ? alt_label : 'Y');
+    write_str(dtostrf(pos.y, -4, 0, str), 4);
+  }
+  else {
+    #if ENABLED(LCD_SHOW_E_TOTAL)
+      char tmp[15];
+      const uint8_t escale = e_move_accumulator >= 100000.0f ? 10 : 1; // After 100m switch to cm
+      sprintf_P(tmp, PSTR("E%-7ld%cm "), uint32_t(_MAX(e_move_accumulator, 0.0f)) / escale, escale == 10 ? 'c' : 'm'); // 1234567mm
+      write_str(tmp);
+    #endif
+  }
+
+  write_byte(alt_label ? alt_label : 'Z');
+  write_str(dtostrf(pos.z, -5, 1, 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             = ui.get_blink();
+  const uint16_t   feedrate_perc     = feedrate_percentage;
+  const uint16_t   fs                = thermalManager.scaledFanSpeed(0);
+  const int16_t    extruder_1_target = thermalManager.degTargetHotend(0);
+  #if HAS_MULTI_HOTEND
+    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 ^ fs ^ extruder_1_target
+    ^ TERN0(HAS_MULTI_HOTEND, extruder_2_target)
+    ^ TERN0(HAS_HEATED_BED, bed_target);
+  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             = ui.get_blink();
+    const duration_t elapsed           = print_job_timer.duration();
+    duration_t       remaining         = TERN0(USE_M73_REMAINING_TIME, ui.get_remaining_time());
+    const uint16_t   feedrate_perc     = feedrate_percentage;
+    const int16_t    extruder_1_temp   = thermalManager.degHotend(0),
+                     extruder_1_target = thermalManager.degTargetHotend(0);
+    #if HAS_MULTI_HOTEND
+      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);
+    TERN_(HAS_MULTI_HOTEND, draw_extruder_2_temp(extruder_2_temp, extruder_2_target, forceUpdate));
+    TERN_(HAS_HEATED_BED, draw_bed_temp(bed_temp, bed_target, forceUpdate));
+
+    uint16_t spd = thermalManager.fan_speed[0];
+
+    #if ENABLED(ADAPTIVE_FAN_SLOWING)
+      if (!blink && thermalManager.fan_speed_scaler[0] < 128)
+        spd = thermalManager.scaledFanSpeed(0, spd);
+    #endif
+
+    draw_fan_speed(thermalManager.fanPercent(spd));
+
+    // Draw elapsed/remaining time
+    const bool show_remaining = ENABLED(SHOW_REMAINING_TIME) && (DISABLED(ROTATE_PROGRESS_DISPLAY) || blink);
+    if (show_remaining && !remaining.second()) {
+      const auto progress = ui.get_progress_percent();
+      if (progress)
+        remaining = elapsed.second() * (100 - progress) / progress;
+    }
+    if (show_remaining && remaining.second())
+      draw_print_time(remaining, 'R');
+    else
+      draw_print_time(elapsed);
+
+    draw_feedrate_percentage(feedrate_perc);
+
+    // Update the fan and bed animations
+    if (spd) draw_fan_icon(blink);
+    TERN_(HAS_HEATED_BED, draw_heat_icon(bed_target > 0 && blink, bed_target > 0));
+  }
+}
+
+bool ST7920_Lite_Status_Screen::position_changed() {
+  const xyz_pos_t pos = current_position;
+  const uint8_t checksum = uint8_t(pos.x) ^ uint8_t(pos.y) ^ uint8_t(pos.z);
+  static uint8_t last_checksum = 0, changed = last_checksum != checksum;
+  if (changed) last_checksum = checksum;
+  return changed;
+}
+
+bool ST7920_Lite_Status_Screen::status_changed() {
+  uint8_t checksum = 0;
+  for (const char *p = ui.status_message; *p; p++) checksum ^= *p;
+  static uint8_t last_checksum = 0;
+  bool changed = last_checksum != checksum;
+  if (changed) last_checksum = checksum;
+  return changed;
+}
+
+bool ST7920_Lite_Status_Screen::blink_changed() {
+  static uint8_t last_blink = 0;
+  const bool blink = ui.get_blink(), changed = last_blink != blink;
+  if (changed) last_blink = blink;
+  return changed;
+}
+
+#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's only enough room for either the status message or the position,
+   * so draw one or the other. When the status message changes, show it for
+   * a few seconds, then return to the position display once the head moves.
+   *
+   *  countdown > 1  -- Show status
+   *  countdown = 1  -- Show status, until movement
+   *  countdown = 0  -- Show position
+   *
+   * If STATUS_EXPIRE_SECONDS is zero, only the status is shown.
+   */
+  if (forceUpdate || status_changed()) {
+    TERN_(STATUS_MESSAGE_SCROLLING, ui.status_scroll_offset = 0);
+    #if STATUS_EXPIRE_SECONDS
+      countdown = ui.status_message[0] ? STATUS_EXPIRE_SECONDS : 0;
+    #endif
+    draw_status_message();
+    blink_changed(); // Clear changed flag
+  }
+  #if !STATUS_EXPIRE_SECONDS
+    else if (TERN0(STATUS_MESSAGE_SCROLLING, blink_changed()))
+      draw_status_message();
+  #else
+    else if (blink_changed()) {
+      if (countdown > 1) {
+        countdown--;
+        TERN_(STATUS_MESSAGE_SCROLLING, draw_status_message());
+      }
+      else if (countdown > 0) {
+        if (position_changed()) {
+          countdown--;
+          forceUpdate = true;
+        }
+        TERN_(STATUS_MESSAGE_SCROLLING, draw_status_message());
+      }
+    }
+
+    if (countdown == 0 && (forceUpdate || position_changed() || TERN(DISABLE_REDUCED_ACCURACY_WARNING, 0, blink_changed())))
+      draw_position(current_position, TERN(DISABLE_REDUCED_ACCURACY_WARNING, 1, all_axes_trusted()));
+  #endif
+}
+
+void ST7920_Lite_Status_Screen::update_progress(const bool forceUpdate) {
+  #if EITHER(LCD_SET_PROGRESS_MANUALLY, SDSUPPORT)
+
+    // 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;
+    const uint8_t progress = ui.get_progress_percent();
+    if (forceUpdate || last_progress != progress) {
+      last_progress = progress;
+      draw_progress_bar(progress);
+    }
+
+  #else
+
+    UNUSED(forceUpdate);
+
+  #endif
+}
+
+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();
+}
+
+// Called prior to the KILL screen to
+// clear the screen, preventing 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();
+}
+
+void MarlinUI::draw_status_screen() {
+  ST7920_Lite_Status_Screen::update(false);
+}
+
+// This method is called before each screen update and
+// fires on_entry() and on_exit() events upon entering
+// or exiting the Status Screen.
+void MarlinUI::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();
+}
+
+#endif // LIGHTWEIGHT_UI