DOGM: Avoid white flash on TFT (re)init (#14631)
- Avoid white flash on TFT (re)init. Unlike Graphical LCD, the TFT init color may be full white if the backlight is on during init. - Add a conditional for delayed backlight init which can be applied to any backlit display.
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@ -233,6 +233,7 @@
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#if ENABLED(MKS_ROBIN_TFT)
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#define DOGLCD
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#define IS_ULTIPANEL
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#define DELAYED_BACKLIGHT_INIT
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#endif
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/**
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@ -219,26 +219,34 @@ void MarlinUI::set_font(const MarlinFont font_nr) {
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// Initialize or re-initialize the LCD
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void MarlinUI::init_lcd() {
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#if PIN_EXISTS(LCD_BACKLIGHT) // Enable LCD backlight
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OUT_WRITE(LCD_BACKLIGHT_PIN, HIGH);
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#if PIN_EXISTS(LCD_BACKLIGHT)
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OUT_WRITE(LCD_BACKLIGHT_PIN, (
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#if ENABLED(DELAYED_BACKLIGHT_INIT)
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LOW // Illuminate after reset
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#else
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HIGH // Illuminate right away
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#endif
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));
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#endif
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#if EITHER(MKS_12864OLED, MKS_12864OLED_SSD1306)
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SET_OUTPUT(LCD_PINS_DC);
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#if !defined(LCD_RESET_PIN)
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#ifndef LCD_RESET_PIN
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#define LCD_RESET_PIN LCD_PINS_RS
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#endif
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#endif
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#if PIN_EXISTS(LCD_RESET)
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OUT_WRITE(LCD_RESET_PIN, LOW); // perform a clean hardware reset
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// Perform a clean hardware reset with needed delays
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OUT_WRITE(LCD_RESET_PIN, LOW);
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_delay_ms(5);
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OUT_WRITE(LCD_RESET_PIN, HIGH);
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_delay_ms(5); // delay to allow the display to initialize
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WRITE(LCD_RESET_PIN, HIGH);
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_delay_ms(5);
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u8g.begin();
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#endif
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#if PIN_EXISTS(LCD_RESET)
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u8g.begin();
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#if PIN_EXISTS(LCD_BACKLIGHT) && ENABLED(DELAYED_BACKLIGHT_INIT)
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WRITE(LCD_BACKLIGHT_PIN, HIGH);
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#endif
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#if HAS_LCD_CONTRAST
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@ -246,11 +254,11 @@ void MarlinUI::init_lcd() {
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#endif
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#if ENABLED(LCD_SCREEN_ROT_90)
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u8g.setRot90(); // Rotate screen by 90°
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u8g.setRot90();
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#elif ENABLED(LCD_SCREEN_ROT_180)
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u8g.setRot180(); // Rotate screen by 180°
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u8g.setRot180();
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#elif ENABLED(LCD_SCREEN_ROT_270)
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u8g.setRot270(); // Rotate screen by 270°
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u8g.setRot270();
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#endif
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uxg_SetUtf8Fonts(g_fontinfo, COUNT(g_fontinfo));
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