fix #210 implement Switch off screen on Lilygo dongle

platformio.ini

@@ -126,6 +126,8 @@ build_flags =
     -DNERMINER_S3_DONGLE
     -DBOARD_HAS_PSRAM
     -DARDUINO_USB_CDC_ON_BOOT
+    -DTFT_BACKLIGHT_ON=HIGH
+    -DTFT_BL=38
 lib_deps = 
 	https://github.com/takkaO/OpenFontRender
 	bblanchon/ArduinoJson@^6.21.2

src/drivers/displays/dongleDisplayDriver.cpp

@@ -103,6 +103,9 @@ void dongleDisplay_Init(void)
 
 void dongleDisplay_AlternateScreenState(void)
 {
+  int screen_state = digitalRead(TFT_BL);
+  Serial.println("Switching display state");
+  digitalWrite(TFT_BL, !screen_state);
 }
 
 void dongleDisplay_AlternateRotation(void)