two_line_oled.py

# Nice two-line display on the 128x32 OLED display

import board
import displayio
import terminalio
from adafruit_bitmap_font import bitmap_font
from adafruit_display_text import label
import adafruit_displayio_ssd1306

# Our "FreeType-CMU Typewriter Text-Bold-R-Normal" bitmap
FONT_PATH = "fonts/cmuntb22.bdf"


class two_line_oled:
    '''Display on an Adafruit 128x64 OLED'''
    def __init__(self, i2c_addr, height):

        displayio.release_displays()

        try:
            i2c = board.I2C()
        except:
            print("Is the I2C wiring correct?")
            raise Exception
            return

        display_bus = displayio.I2CDisplay(i2c, device_address=i2c_addr)
        WIDTH = 128
        HEIGHT = height
        
        display = adafruit_displayio_ssd1306.SSD1306(display_bus, width=WIDTH, height=HEIGHT)

        # TODO: check for failure?
        font_main = bitmap_font.load_font(FONT_PATH)

        text_area_1 = label.Label(font_main, color=0xFFFFFF)
        text_area_1.x =  0
        text_area_1.y = 12

        text_area_2 = label.Label(terminalio.FONT, color=0xFFFFFF)
        text_area_2.x =  0
        text_area_2.y = 28

        root = displayio.Group()
        display.root_group = root
        root.append(text_area_1)
        root.append(text_area_2)

        self.text_area_1 = text_area_1
        self.text_area_2 = text_area_2

    def set_text_1(self, text):
        self.text_area_1.text = text
        
    def set_text_2(self, text):
        self.text_area_2.text = text

    def blank_screen(self):
        self.set_text_1("")
        self.set_text_2("")

def test():
    print(f"\nTesting {__name__}....")
    tlo = two_line_oled()
    tlo.set_text_1("00:23:34")
    tlo.set_text_2("Test-a-roni! How wide?")
    print("Test done.")
    while True:
        pass