epd_test.py

import time
import board
import displayio
import adafruit_ssd1680
from fourwire import FourWire

displayio.release_displays()

# This pinout works on a Metro M4 and may need to be altered for other boards.
spi = board.EPD_SPI()  # Uses SCK and MOSI
epd_cs = board.EPD_CS
epd_dc = board.EPD_DC
epd_reset = board.EPD_RST  # Set to None for FeatherWing
epd_busy = board.EPD.BUSY  # Set to None for FeatherWing

display_bus = FourWire(
    spi, command=epd_dc, chip_select=epd_cs, reset=epd_reset, baudrate=1000000
)
time.sleep(1)

# For issues with display not updating top/bottom rows correctly set colstart to 8
display = adafruit_ssd1680.SSD1680(
    display_bus,
    width=250,
    height=122,
    busy_pin=epd_busy,
    highlight_color=0xFF0000,
    rotation=270,
)


g = displayio.Group()

with open("/display-ruler.bmp", "rb") as f:
    pic = displayio.OnDiskBitmap(f)
    t = displayio.TileGrid(pic, pixel_shader=pic.pixel_shader)
    g.append(t)

    display.root_group = g

    display.refresh()

    print("refreshed")

    time.sleep(display.time_to_refresh + 5)
    # Always refresh a little longer. It's not a problem to refresh
    # a few seconds more, but it's terrible to refresh too early
    # (the display will throw an exception when if the refresh
    # is too soon)
    print("waited correct time")


# Keep the display the same
while True:
    time.sleep(10)