Add example and lint

Author: tannewt

README.rst

@@ -31,9 +31,6 @@ Installing from PyPI
 .. note:: This library is not available on PyPI yet. Install documentation is included
    as a standard element. Stay tuned for PyPI availability!
 
-.. todo:: Remove the above note if PyPI version is/will be available at time of release.
-   If the library is not planned for PyPI, remove the entire 'Installing from PyPI' section.
-
 On supported GNU/Linux systems like the Raspberry Pi, you can install the driver locally `from
 PyPI <https://pypi.org/project/adafruit-circuitpython-il91874/>`_. To install for current user:
 
@@ -59,7 +56,47 @@ To install in a virtual environment in your current project:
 Usage Example
 =============
 
-.. todo:: Add a quick, simple example. It and other examples should live in the examples folder and be included in docs/examples.rst.
+.. code-block:: python
+
+    """Simple test script for 2.7" 264x176 Tri-Color display shield
+
+    Supported products:
+      * Adafruit 2.7" Tri-Color ePaper Display Shield
+        * https://www.adafruit.com/product/4229
+      """
+
+    import time
+    import board
+    import busio
+    import displayio
+    import adafruit_il91874
+
+    displayio.release_displays()
+
+    spi = board.SPI()
+    epd_cs = board.D10
+    epd_dc = board.D9
+
+    display_bus = displayio.FourWire(spi, command=epd_dc, chip_select=epd_cs, baudrate=1000000)
+    time.sleep(1)
+
+    display = adafruit_il91874.IL91874(display_bus, width=264, height=176, highlight_color=0xff0000, rotation=90)
+
+    g = displayio.Group()
+
+    f = open("/display-ruler.bmp", "rb")
+
+    pic = displayio.OnDiskBitmap(f)
+    t = displayio.TileGrid(pic, pixel_shader=displayio.ColorConverter())
+    g.append(t)
+
+    display.show(g)
+
+    display.refresh()
+
+    print("refreshed")
+
+    time.sleep(120)
 
 Contributing
 ============

adafruit_il91874.py

@@ -33,8 +33,7 @@
 
 **Hardware:**
 
-.. todo:: Add links to any specific hardware product page(s), or category page(s). Use unordered list & hyperlink rST
-   inline format: "* `Link Text <url>`_"
+* `Adafruit 2.7" Tri-Color ePaper Display Shield <https://www.adafruit.com/product/4229>`_
 
 **Software and Dependencies:**
 

docs/conf.py

@@ -20,7 +20,7 @@
 # Uncomment the below if you use native CircuitPython modules such as
 # digitalio, micropython and busio. List the modules you use. Without it, the
 # autodoc module docs will fail to generate with a warning.
-# autodoc_mock_imports = ["digitalio", "busio"]
+autodoc_mock_imports = ["displayio"]
 
 
 intersphinx_mapping = {'python': ('https://docs.python.org/3.4', None),'CircuitPython': ('https://circuitpython.readthedocs.io/en/latest/', None)}

docs/index.rst

@@ -23,14 +23,13 @@ Table of Contents
 .. toctree::
     :caption: Tutorials
 
-.. todo:: Add any Learn guide links here. If there are none, then simply delete this todo and leave
-    the toctree above for use later.
+    Adafruit eInk Display Breakouts <https://learn.adafruit.com/adafruit-eink-display-breakouts>
+
 
 .. toctree::
     :caption: Related Products
 
-.. todo:: Add any product links here. If there are none, then simply delete this todo and leave
-    the toctree above for use later.
+    Adafruit 2.7" Tri-Color ePaper Display Shield <https://www.adafruit.com/product/4229>
 
 .. toctree::
     :caption: Other Links

examples/il91874_simpletest.py

@@ -0,0 +1,39 @@
+"""Simple test script for 2.7" 264x176 Tri-Color display shield
+
+Supported products:
+  * Adafruit 2.7" Tri-Color ePaper Display Shield
+    * https://www.adafruit.com/product/4229
+  """
+
+import time
+import board
+import busio
+import displayio
+import adafruit_il91874
+
+displayio.release_displays()
+
+spi = board.SPI()
+epd_cs = board.D10
+epd_dc = board.D9
+
+display_bus = displayio.FourWire(spi, command=epd_dc, chip_select=epd_cs, baudrate=1000000)
+time.sleep(1)
+
+display = adafruit_il91874.IL91874(display_bus, width=264, height=176, highlight_color=0xff0000, rotation=90)
+
+g = displayio.Group()
+
+f = open("/display-ruler.bmp", "rb")
+
+pic = displayio.OnDiskBitmap(f)
+t = displayio.TileGrid(pic, pixel_shader=displayio.ColorConverter())
+g.append(t)
+
+display.show(g)
+
+display.refresh()
+
+print("refreshed")
+
+time.sleep(120)