Add example

Author: tannewt

examples/pyportal.py

@@ -0,0 +1,57 @@
+import board
+import displayio
+import os
+import gc
+import pulseio
+import random
+import time
+import microcontroller
+
+from adafruit_bitmap_font import bitmap_font
+from adafruit_display_text.text_area import TextArea
+
+backlight = pulseio.PWMOut(microcontroller.pin.PB21)
+
+max_brightness = 2 ** 15
+
+fonts = list(filter(lambda x: x.endswith("bdf") and not x.startswith("."), os.listdir("/")))
+fonts = [bitmap_font.load_font(x) for x in fonts]
+
+
+print("fade up")
+# Fade up the backlight
+for b in range(100):
+    backlight.duty_cycle = b * max_brightness // 100
+    time.sleep(0.01)  # default (0.01)
+
+demos = ["CircuitPython = Code + Community", "accents - üàêùéáçãÍóí", "others - αψ◌"]
+
+splash = displayio.Group(max_size=len(fonts) * len(demos))
+board.DISPLAY.show(splash)
+max_y = 0
+y = 2
+for demo_text in demos:
+    for font in fonts:
+        print("Font load {}".format(font.name))
+        area = TextArea(font, text=demo_text)
+        area.y = y
+        splash.append(area.group)
+
+        y += area.height
+
+        # Wait for the image to load.
+        board.DISPLAY.wait_for_frame()
+        gc.collect()
+        print("mem free:", gc.mem_free())
+
+# Wait forever
+time.sleep(600)
+
+# Fade down the backlight
+for b in range(50, -1, -1):
+    backlight.duty_cycle = b * max_brightness // 100
+    time.sleep(0.005)  # default (0.005)
+
+print("fade down")
+
+    # splash.pop()