Simple test

Ensure your device works with this simple test.

examples/il91874_simpletest.py
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"""
  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

  This program only requires the adafruit_il91874 library in /lib
  for CircuitPython 5.0 and above which has displayio support.
"""

import time
import board
import displayio
import adafruit_il91874

# Used to ensure the display is free in CircuitPython
displayio.release_displays()

# Define the pins needed for display use on the Metro
spi = board.SPI()
epd_cs = board.D10
epd_dc = board.D9

# Create the displayio connection to the display pins
display_bus = displayio.FourWire(spi, command=epd_dc, chip_select=epd_cs,
                                 baudrate=1000000)
time.sleep(1)  # Wait a bit

# Create the display object - the third color is red (0xff0000)
display = adafruit_il91874.IL91874(display_bus, width=264, height=176,
                                   highlight_color=0xff0000, rotation=90)

# 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 (does not refresh)
display.show(g)

# Show the image on the display
display.refresh()

print("refreshed")

# Do Not refresh the screen more often than every 180 seconds
#   for eInk displays! Rapid refreshes will damage the panel.
time.sleep(180)