1  import time
 2  import board
 3  import busio
 4  import digitalio
 5  
 6  import adafruit_pcd8544
 7  
 8  # Initialize SPI bus and control pins
 9  spi = busio.SPI(board.SCK, MOSI=board.MOSI)
10  dc = digitalio.DigitalInOut(board.D6)  # data/command
11  cs = digitalio.DigitalInOut(board.D5)  # Chip select
12  reset = digitalio.DigitalInOut(board.D9)  # reset
13  
14  display = adafruit_pcd8544.PCD8544(spi, dc, cs, reset)
15  
16  display.bias = 4
17  display.contrast = 60
18  
19  # Turn on the Backlight LED
20  backlight = digitalio.DigitalInOut(board.D10)  # backlight
21  backlight.switch_to_output()
22  backlight.value = True
23  
24  print("Pixel test")
25  # Clear the display.  Always call show after changing pixels to make the display
26  # update visible!
27  display.fill(0)
28  display.show()
29  
30  # Set a pixel in the origin 0,0 position.
31  display.pixel(0, 0, 1)
32  # Set a pixel in the middle position.
33  display.pixel(display.width // 2, display.height // 2, 1)
34  # Set a pixel in the opposite corner position.
35  display.pixel(display.width - 1, display.height - 1, 1)
36  display.show()
37  time.sleep(2)
38  
39  print("Lines test")
40  # we'll draw from corner to corner, lets define all the pair coordinates here
41  corners = (
42      (0, 0),
43      (0, display.height - 1),
44      (display.width - 1, 0),
45      (display.width - 1, display.height - 1),
46  )
47  
48  display.fill(0)
49  for corner_from in corners:
50      for corner_to in corners:
51          display.line(corner_from[0], corner_from[1], corner_to[0], corner_to[1], 1)
52  display.show()
53  time.sleep(2)
54  
55  print("Rectangle test")
56  display.fill(0)
57  w_delta = display.width / 10
58  h_delta = display.height / 10
59  for i in range(11):
60      display.rect(0, 0, int(w_delta * i), int(h_delta * i), 1)
61  display.show()
62  time.sleep(2)
63  
64  print("Text test")
65  display.fill(0)
66  display.text("hello world", 0, 0, 1)
67  display.text("this is the", 0, 8, 1)
68  display.text("CircuitPython", 0, 16, 1)
69  display.text("adafruit lib-", 0, 24, 1)
70  display.text("rary for the", 0, 32, 1)
71  display.text("PCD8544! :) ", 0, 40, 1)
72  
73  display.show()
74  
75  while True:
76      display.invert = True
77      time.sleep(0.5)
78      display.invert = False
79      time.sleep(0.5)