thooge/esp32-nmea2000-obp60
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Implement shaddow frame buffer for TFT display

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This commit is contained in:
Norbert Walter
2026-03-01 15:55:34 +00:00
parent 907a817573
commit 762004ac9f
3 changed files with 187 additions and 11 deletions
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lib/obp60task/OBP60Extensions.cpp
+30 -5
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@@ -57,9 +57,30 @@ GxEPD2_BW<GxEPD2_420_SE0420NQ04, GxEPD2_420_SE0420NQ04::HEIGHT> & getdisplay(){r
#endif
#ifdef DISPLAY_ST7796
// only instantiate; class defined in header
static LGFX display;
LGFX & getdisplay(){return display;}
// panel device + offscreen shadow framebuffer
static LGFX panelDisplay;
static LGFXCanvas shadowDisplay(&panelDisplay);
static bool shadowDisplayInitialized = false;
LGFXCanvas & getdisplay(){return shadowDisplay;}
LGFX & getpaneldisplay(){return panelDisplay;}
bool initDisplayShadowBuffer(){
if (shadowDisplayInitialized) return true;
shadowDisplay.setPsram(true);
shadowDisplay.setColorDepth(16);
shadowDisplay.setTextDatum(textdatum_t::baseline_left);
if (shadowDisplay.createSprite(GxEPD_WIDTH, GxEPD_HEIGHT) == nullptr) {
shadowDisplayInitialized = false;
return false;
}
shadowDisplay.fillScreen(GxEPD_BLACK);
shadowDisplayInitialized = true;
return true;
}
#endif
// Horter I2C moduls
@@ -258,7 +279,9 @@ void deepSleep(CommonData &common){
getdisplay().setCursor(65, 175);
getdisplay().print("To wake up press key and wait 5s");
displayNextPage(); // Update display contents
#ifndef DISPLAY_ST7796
#ifdef DISPLAY_ST7796
getpaneldisplay().powerSave(true); // Display power save
#else
getdisplay().powerOff(); // Display power off
#endif
setPortPin(OBP_POWER_50, false); // Power off ePaper display
@@ -285,7 +308,9 @@ void deepSleep(CommonData &common){
getdisplay().setCursor(65, 175);
getdisplay().print("To wake up press wheel and wait 5s");
displayNextPage(); // Partial update
#ifndef DISPLAY_ST7796
#ifdef DISPLAY_ST7796
getpaneldisplay().powerSave(true); // Display power save
#else
getdisplay().powerOff(); // Display power off
#endif
setPortPin(OBP_POWER_EPD, false); // Power off ePaper display