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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 0x18ST7920_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 foldingy -= 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 0x06const 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 foldingy -= 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);}elsewrite_word(0x0000);}}void ST7920_Lite_Status_Screen::draw_static_elements() {scroll_or_addr_select(0);// Load the animated bed and fan iconsload_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 GDRAMdraw_gdram_icon(1, 1, nozzle_icon);#if HOTENDS > 1draw_gdram_icon(1,2,nozzle_icon);draw_gdram_icon(1,3,bed_icon);#elsedraw_gdram_icon(1,2,bed_icon);#endifdraw_gdram_icon(6,2,feedrate_icon);// Draw the initial fan icondraw_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 lineconst uint8_t top = 1, // Top in pixelsbottom = 13, // Bottom in pixelsleft = 12, // Left edge, in 16-bit wordswidth = 4; // Width of progress bar, in 16-bit words#elseconst uint8_t top = 16 + 1,bottom = 16 + 13,left = 5,width = 3;#endifconst uint8_t char_pcnt = 100 / width; // How many percent does each 16-bit word represent?// Draw the progress bar as a bitmap in CGRAMfor (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 byteselse 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 barif (y == top || y == bottom)gfx_word = 0xFFFF; // Draw top/bottom borderelse if (x == width - 1)gfx_word |= 0x0001; // Draw right borderelse if (x == 0)gfx_word |= 0x8000; // Draw left borderwrite_word(gfx_word);}}// Draw the percentage as text in DDRAM#if HOTENDS == 1set_ddram_address(DDRAM_LINE_3 + 4);begin_data();write_byte(' ');#elseset_ddram_address(DDRAM_LINE_2 + left);begin_data();#endif// Draw centeredif (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 == 1DDRAM_LINE_2#elseDDRAM_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_BEDbool 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_BEDvoid 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;}#endifvoid 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 == 1set_ddram_address(DDRAM_LINE_3);#elseset_ddram_address(DDRAM_LINE_3 + 5);#endifchar 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 == 1set_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 itif (slen <= lcd_len) {// The string isn't scrolling and may not fill the screenwrite_str(str);// Fill the rest with spaceswhile (slen < lcd_len) {write_byte(' ');++slen;}}else {// String is larger than the available space in screen.// Get a pointer to the next valid UTF8 characterconst char *stat = str + status_scroll_offset;// Get the string remaining lengthconst uint8_t rlen = utf8_strlen(stat);// If we have enough characters to displayif (rlen >= lcd_len) {// The remaining string fills the screen - Print itwrite_str(stat, lcd_len);}else {// The remaining string does not completely fill the screenwrite_str(stat); // The string leaves spaceuint8_t chars = lcd_len - rlen; // Amount of space left in characterswrite_byte('.'); // Always at 1+ spaces left, draw a dotif (--chars) { // Draw a second dot if there's spacewrite_byte('.');if (--chars)write_str(str, chars); // Print a second copy of the message}}// Adjust by complete UTF8 charactersif (status_scroll_offset < slen) {status_scroll_offset++;while (!START_OF_UTF8_CHAR(str[status_scroll_offset]))status_scroll_offset++;}elsestatus_scroll_offset = 0;}#else// Get the UTF8 character count of the stringuint8_t slen = utf8_strlen(str);// Just print the string to the LCDwrite_str(str, lcd_len);// Fill the rest with spaces if there are missing spaceswhile (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 > 1const int16_t extruder_2_target = thermalManager.degTargetHotend(1);#endif#if HAS_HEATED_BEDconst int16_t bed_target = thermalManager.degTargetBed();#endifstatic 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 > 1const int16_t extruder_2_temp = thermalManager.degHotend(1),extruder_2_target = thermalManager.degTargetHotend(1);#endif#if HAS_HEATED_BEDconst int16_t bed_temp = thermalManager.degBed(),bed_target = thermalManager.degTargetBed();#endifdraw_extruder_1_temp(extruder_1_temp, extruder_1_target, forceUpdate);#if HOTENDS > 1draw_extruder_2_temp(extruder_2_temp, extruder_2_target, forceUpdate);#endif#if HAS_HEATED_BEDdraw_bed_temp(bed_temp, bed_target, forceUpdate);#endifdraw_fan_speed(fan_speed);draw_print_time(elapsed);draw_feedrate_percentage(feedrate_perc);// Update the fan and bed animationsif (fan_speed > 0) draw_fan_icon(blink);#if HAS_HEATED_BEDif (bed_target > 0)draw_heat_icon(blink, true);elsedraw_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#endifvoid ST7920_Lite_Status_Screen::update_status_or_position(bool forceUpdate) {#if STATUS_EXPIRE_SECONDSstatic 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_SECONDScountdown = lcd_status_message[0] ? STATUS_EXPIRE_SECONDS : 0;#endifdraw_status_message(lcd_status_message);blink_changed(); // Clear changed flag}#if !STATUS_EXPIRE_SECONDS#if ENABLED(STATUS_MESSAGE_SCROLLING)elsedraw_status_message(lcd_status_message);#endif#elseelse 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#elseall_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 printingif (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);#elseUNUSED(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();elseST7920_Lite_Status_Screen::on_exit();}