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displayio_ssd1305_simpletest.py
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displayio_ssd1305_simpletest.py
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# SPDX-FileCopyrightText: 2021 ladyada for Adafruit Industries
# SPDX-License-Identifier: MIT
"""
This test will initialize the display using displayio and draw a solid white
background, a smaller black rectangle, and some white text.
"""
import board
import displayio
# Starting in CircuitPython 9.x fourwire will be a seperate internal library
# rather than a component of the displayio library
try:
from fourwire import FourWire
# Use for I2C
# from i2cdisplaybus import I2CDisplayBus
except ImportError:
from displayio import FourWire
# from displayio import I2CDisplay as I2CDisplayBus
import terminalio
from adafruit_display_text import label
import adafruit_displayio_ssd1305
displayio.release_displays()
# Reset is usedfor both SPI and I2C
oled_reset = board.D9
# Use for SPI
spi = board.SPI()
oled_cs = board.D5
oled_dc = board.D6
display_bus = FourWire(
spi, command=oled_dc, chip_select=oled_cs, baudrate=1000000, reset=oled_reset
)
# Use for I2C
# i2c = board.I2C() # uses board.SCL and board.SDA
# i2c = board.STEMMA_I2C() # For using the built-in STEMMA QT connector on a microcontroller
# display_bus = I2CDisplayBus(i2c, device_address=0x3c, reset=oled_reset)
WIDTH = 128
HEIGHT = 64 # Change to 32 if needed
BORDER = 8
FONTSCALE = 1
display = adafruit_displayio_ssd1305.SSD1305(display_bus, width=WIDTH, height=HEIGHT)
# Make the display context
splash = displayio.Group()
display.root_group = splash
color_bitmap = displayio.Bitmap(display.width, display.height, 1)
color_palette = displayio.Palette(1)
color_palette[0] = 0xFFFFFF # White
bg_sprite = displayio.TileGrid(color_bitmap, pixel_shader=color_palette, x=0, y=0)
splash.append(bg_sprite)
# Draw a smaller inner rectangle
inner_bitmap = displayio.Bitmap(
display.width - BORDER * 2, display.height - BORDER * 2, 1
)
inner_palette = displayio.Palette(1)
inner_palette[0] = 0x000000 # Black
inner_sprite = displayio.TileGrid(
inner_bitmap, pixel_shader=inner_palette, x=BORDER, y=BORDER
)
splash.append(inner_sprite)
# Draw a label
text = "Hello World!"
text_area = label.Label(terminalio.FONT, text=text, color=0xFFFFFF)
text_width = text_area.bounding_box[2] * FONTSCALE
text_group = displayio.Group(
scale=FONTSCALE,
x=display.width // 2 - text_width // 2,
y=display.height // 2,
)
text_group.append(text_area) # Subgroup for text scaling
splash.append(text_group)
while True:
pass