[RTduino] support TFT_eSPI demo

bsp/stm32/stm32l475-atk-pandora/board/ports/arduino/SConscript

@@ -5,7 +5,7 @@ src = []
 
 if GetDepend(['BSP_USING_ARDUINO_ST7789_ADAFRUIT_GFX_DEMO']):
     src += ['ST7789_adafruit_gfx_demo.cpp']
-elif GetDepend(['BSP_USING_ARDUINO_ST7789_ADAFRUIT_GFX_DEMO']):
+elif GetDepend(['BSP_USING_ARDUINO_ST7789_TFT_ESPI_DEMO']):
     src += ['ST7789_tft_espi_demo.cpp']
 
 group = DefineGroup('RTduino-libraries', src, depend = ['BSP_USING_ARDUINO'])

bsp/stm32/stm32l475-atk-pandora/board/ports/arduino/ST7789_tft_espi_demo.cpp

@@ -9,9 +9,35 @@
  */
 
 #include <RTduino.h>
+#include <TFT_eSPI.h>
+
+TFT_eSPI tft;
 
 static void st7789_setup(void)
 {
+    Serial.begin();
+
+    // lcd init
+    tft.init();
+    tft.fillScreen(TFT_DARKCYAN);
+    Serial.println("screen init success.");
+
+    // lcd test
+    tft.setTextColor(TFT_BLACK);
+    tft.setCursor (12, 5);
+    tft.print("Original ADAfruit font!");
+
+    // The new larger fonts do not use the .setCursor call, coords are embedded
+    tft.setTextColor(TFT_BLACK, TFT_BLACK); // Do not plot the background colour
+
+    // Overlay the black text on top of the rainbow plot (the advantage of not drawing the backgorund colour!)
+    tft.drawCentreString("Font size 2", 120, 14, 2); // Draw text centre at position 80, 12 using font 2
+
+    tft.drawCentreString("Font size 4", 120, 30, 4); // Draw text centre at position 80, 24 using font 4
+
+    tft.drawCentreString("12.34", 120, 54, 6); // Draw text centre at position 80, 24 using font 6
+
+    tft.drawCentreString("12.34 is in font size 6", 120, 92, 2); // Draw text centre at position 80, 90 using font 2
 }
 
 static void st7789_loop(void)