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examples/scroll_kbv/scroll_kbv.ino

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+#include <Adafruit_GFX.h> // Hardware-specific library
+#include <MCUFRIEND_kbv.h>
+MCUFRIEND_kbv tft;
+
+#define BLACK   0x0000
+#define BLUE    0x001F
+#define RED     0xF800
+#define GREEN   0x07E0
+#define CYAN    0x07FF
+#define MAGENTA 0xF81F
+#define YELLOW  0xFFE0
+#define WHITE   0xFFFF
+
+// work in line numbers.  Font height in ht
+int16_t ht = 16, top = 3, line, lines = 15, scroll;
+
+void setup()
+{
+    tft.reset();
+    uint16_t id = tft.readID();
+    tft.begin(id);
+    tft.setRotation(0);     //Portrait
+    tft.fillScreen(BLACK);
+    tft.setTextColor(WHITE, BLACK);
+    tft.setTextSize(2);     // System font is 8 pixels.  ht = 8*2=16
+    tft.setCursor(100, 0);
+    tft.print("ID = 0x");
+    tft.println(id, HEX);
+    if (id == 0x9320 || id == 0x9325 || id == 0xB509) {
+        top = 0;                      // these controllers scroll full screen
+        lines = tft.height() / ht;    // we are in portrait mode
+    }
+    if (id == 0x7783) {
+        tft.println("can NOT scroll");
+        while (1);                    // die.
+    }
+    tft.setCursor(0, 0);
+    for (line = 1; line < 21; line++) tft.println(String(line) + ": ");
+}
+
+void loop()
+{
+    tft.setCursor(0, (scroll + top) * ht);
+    if (++scroll >= lines) scroll = 0;
+    tft.vertScroll(top * ht, lines * ht, (scroll) * ht);
+    tft.println(String(line) + ": [" + String(scroll) + "]  ");
+    delay(100);
+    line++;
+}