Add simple touch demo.

demo_fonts8x8.py

@@ -1,4 +1,4 @@
-"""ILI9341 demo demo (fonts 8x8)."""
+"""ILI9341 demo (fonts 8x8)."""
 from time import sleep
 from ili9341 import Display, color565
 from machine import Pin, SPI  # type: ignore

demo_touch.py

@@ -0,0 +1,64 @@
+"""ILI9341 demo (simple touch demo)."""
+from ili9341 import Display, color565
+from xpt2046 import Touch
+from machine import idle, Pin, SPI  # type: ignore
+
+
+class Demo(object):
+    """Touchscreen simple demo."""
+    CYAN = color565(0, 255, 255)
+    PURPLE = color565(255, 0, 255)
+    WHITE = color565(255, 255, 255)
+
+    def __init__(self, display, spi2):
+        """Initialize box.
+
+        Args:
+            display (ILI9341): display object
+            touch (XPT2046): touchscreen object
+        """
+        self.display = display
+        self.touch = Touch(spi2, cs=Pin(5), int_pin=Pin(0),
+                           int_handler=self.touchscreen_press)
+        # Display initial message
+        self.display.draw_text8x8(self.display.width // 2 - 32,
+                                  self.display.height - 9,
+                                  "TOUCH ME",
+                                  self.WHITE,
+                                  background=self.PURPLE)
+
+        # A small 5x5 sprite for the dot
+        self.dot = bytearray(b'\x00\x00\x07\xE0\xF8\x00\x07\xE0\x00\x00\x07\xE0\xF8\x00\xF8\x00\xF8\x00\x07\xE0\xF8\x00\xF8\x00\xF8\x00\xF8\x00\xF8\x00\x07\xE0\xF8\x00\xF8\x00\xF8\x00\x07\xE0\x00\x00\x07\xE0\xF8\x00\x07\xE0\x00\x00')
+
+    def touchscreen_press(self, x, y):
+        """Process touchscreen press events."""
+        # Y needs to be flipped
+        y = (self.display.height - 1) - y
+        # Display coordinates
+        self.display.draw_text8x8(self.display.width // 2 - 32,
+                                  self.display.height - 9,
+                                  "{0:03d}, {1:03d}".format(x, y),
+                                  self.CYAN)
+        # Draw dot
+        self.display.draw_sprite(self.dot, x - 2, y - 2, 5, 5)
+
+
+def test():
+    """Test code."""
+    spi1 = SPI(1, baudrate=40000000, sck=Pin(14), mosi=Pin(13))
+    display = Display(spi1, dc=Pin(4), cs=Pin(16), rst=Pin(17))
+    spi2 = SPI(2, baudrate=1000000, sck=Pin(18), mosi=Pin(23), miso=Pin(19))
+
+    Demo(display, spi2)
+
+    try:
+        while True:
+            idle()
+
+    except KeyboardInterrupt:
+        print("\nCtrl-C pressed.  Cleaning up and exiting...")
+    finally:
+        display.cleanup()
+
+
+test()