Merge pull request #3 from adafruit/TheKitty-patch-1

Cleanup and comment, reviewed by Ladyada

examples/il0373_2.13_color.py

@@ -1,43 +1,53 @@
-"""Simple test script for 2.13" 212x104 tri-color display.
-
+"""Simple test script for Adafruit 2.13" 212x104 tri-color display
 Supported products:
   * Adafruit 2.13" Tri-Color Display Breakout
-    * https://www.adafruit.com/product/4086
-  """
+  * https://www.adafruit.com/product/4086 (breakout) or
+  * https://www.adafruit.com/product/4128 (FeatherWing)
+"""
 
 import time
 import board
 import displayio
 import adafruit_il0373
 
+# Used to ensure the display is free in CircuitPython
 displayio.release_displays()
 
-# This pinout works on a Feather M4 and may need to be altered for other boards.
-spi = board.SPI() # Uses SCK and MOSI
+# Define the pins needed for display use
+# This pinout is for a Feather M4 and may be different for other boards
+spi = board.SPI()  # Uses SCK and MOSI
 epd_cs = board.D9
 epd_dc = board.D10
 epd_reset = board.D5
 epd_busy = board.D6
 
-display_bus = displayio.FourWire(spi, command=epd_dc, chip_select=epd_cs, reset=epd_reset,
-                                 baudrate=1000000)
-time.sleep(1)
+# Create the displayio connection to the display pins
+display_bus = displayio.FourWire(spi, command=epd_dc, chip_select=epd_cs,
+                                 reset=epd_reset, baudrate=1000000)
+time.sleep(1)  # Wait a bit
 
-display = adafruit_il0373.IL0373(display_bus, width=212, height=104, rotation=90, busy_pin=epd_busy,
+# Create the display object - the third color is red (0xff0000)
+display = adafruit_il0373.IL0373(display_bus, width=212, height=104,
+                                 rotation=90, busy_pin=epd_busy,
                                  highlight_color=0xff0000)
 
+# Create a display group for our screen objects
 g = displayio.Group()
 
+# Display a ruler graphic from the root directory of the CIRCUITPY drive
 f = open("/display-ruler.bmp", "rb")
 
 pic = displayio.OnDiskBitmap(f)
+# Create a Tilegrid with the bitmap and put in the displayio group
 t = displayio.TileGrid(pic, pixel_shader=displayio.ColorConverter())
 g.append(t)
 
+# Place the display group on the screen
 display.show(g)
 
+# Refresh the display to have it actually show
+# NOTE: Do not refresh eInk displays more often than seconds or more!
 display.refresh()
-
 print("refreshed")
 
 time.sleep(120)