Simple test

Ensure your device works with this simple test.

examples/gizmo_simpletest.py
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# SPDX-FileCopyrightText: 2021 ladyada for Adafruit Industries
# SPDX-License-Identifier: MIT

import time
from random import randrange
import displayio
from adafruit_gizmo import tft_gizmo

# Create the TFT Gizmo display
display = tft_gizmo.TFT_Gizmo()

# You can now use the display to do whatever you want
# Here we show how to draw random pixels

# Create a bitmap with two colors
bitmap = displayio.Bitmap(display.width, display.height, 2)

# Create a two color palette
palette = displayio.Palette(2)
palette[0] = 0x000000
palette[1] = 0xFFFFFF

# Create a TileGrid using the Bitmap and Palette
tile_grid = displayio.TileGrid(bitmap, pixel_shader=palette)

# Create a Group
group = displayio.Group()

# Add the TileGrid to the Group
group.append(tile_grid)

# Add the Group to the Display
display.show(group)

# Draw pixels
while True:
    for _ in range(200):
        x = randrange(0, display.width)
        y = randrange(0, display.height)
        bitmap[x, y] = 1
        time.sleep(0.1)
    for i in range(display.width * display.height):
        bitmap[i] = 0

Other examples

examples/gizmo_tft_demo.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 green
background, a smaller purple rectangle, and some yellow text.
"""
import displayio
import terminalio
from adafruit_display_text import label
from adafruit_gizmo import tft_gizmo

# Create the TFT Gizmo display
display = tft_gizmo.TFT_Gizmo()

# Make the display context
splash = displayio.Group(max_size=10)
display.show(splash)

color_bitmap = displayio.Bitmap(240, 240, 1)
color_palette = displayio.Palette(1)
color_palette[0] = 0x00FF00  # Bright Green

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(200, 200, 1)
inner_palette = displayio.Palette(1)
inner_palette[0] = 0xAA0088  # Purple
inner_sprite = displayio.TileGrid(inner_bitmap, pixel_shader=inner_palette, x=20, y=20)
splash.append(inner_sprite)

# Draw a label
text_group = displayio.Group(max_size=10, scale=2, x=50, y=120)
text = "Hello World!"
text_area = label.Label(terminalio.FONT, text=text, color=0xFFFF00)
text_group.append(text_area)  # Subgroup for text scaling
splash.append(text_group)

while True:
    pass
examples/gizmo_tft_thermometer.py
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# SPDX-FileCopyrightText: 2021 ladyada for Adafruit Industries
# SPDX-License-Identifier: MIT

"""
This example will initialize the display using displayio and draw a bmp image
background, and overlay text containing the value read from the on-board temperature sensor.
User may press the A button to switch between celsius and fahrenheit units.

Required libraries:
* Adafruit_CircuitPython_Gizmo
* Adafruit_CircuitPython_ST7789
* Adafruit_CircuitPython_Display_Text
* Adafruit_CircuitPython_CircuitPlayground
"""
import time
from adafruit_circuitplayground import cp
import displayio
import terminalio
from adafruit_display_text import label
from adafruit_gizmo import tft_gizmo

display = tft_gizmo.TFT_Gizmo()


# text scaling factor
TEXT_SCALE = 2

# previous iteration button value
old_a_val = cp.button_a

# boolean for current unit type
show_c_units = True


# function to convert celsius degrees to fahrenheit
def c_to_f(c_val):
    return (c_val * 9 / 5) + 32


# Open the background image file
with open("/thermometer_background.bmp", "rb") as bitmap_file:

    # Setup the file as the bitmap data source
    bitmap = displayio.OnDiskBitmap(bitmap_file)

    # Create a TileGrid to hold the bitmap
    tile_grid = displayio.TileGrid(bitmap, pixel_shader=displayio.ColorConverter())

    # Create a Group to hold the TileGrid
    group = displayio.Group()

    # Add the TileGrid to the Group
    group.append(tile_grid)

    # variable with initial text value, temperature rounded to 2 places
    text = "%.2f C" % (round(cp.temperature, 2))

    # Create a Group for the text so we can scale it
    text_group = displayio.Group(max_size=1, scale=TEXT_SCALE, x=0, y=0)

    # Create a Label to show the initial temperature value
    text_area = label.Label(terminalio.FONT, text=text, color=0xFFFFFF)

    # Set the anchor_point for center,top
    text_area.anchor_point = (0.5, 0.0)

    # Set the location to center of display, accounting for text_scale
    text_area.anchored_position = (240 / (2 * TEXT_SCALE), 240 / (2 * TEXT_SCALE))

    # Subgroup for text scaling
    text_group.append(text_area)

    # Add the text_group to main Group
    group.append(text_group)

    # Add the main Group to the Display
    display.show(group)

    # Loop forever
    while True:
        # set current button state to variable
        cur_a_val = cp.button_a
        if cur_a_val and not old_a_val:  # if the button was released
            print("Just released")
            # flip the units boolean to the opposite value
            show_c_units = not show_c_units

        if show_c_units:
            # Update the text
            text_area.text = "%.2f C" % (round(cp.temperature, 2))
        else:  # show f units
            # Update the text
            text_area.text = "%.2f F" % (round(c_to_f(cp.temperature), 2))

        # set previous button value for next time
        old_a_val = cur_a_val
        # Wait a little bit
        time.sleep(0.2)
examples/gizmo_eink_simpletest.py
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# SPDX-FileCopyrightText: 2021 ladyada for Adafruit Industries
# SPDX-License-Identifier: MIT

import time
import displayio
from adafruit_gizmo import eink_gizmo

display = eink_gizmo.EInk_Gizmo()
# Use the below line instead for the 200x200 E-Ink Gizmo
# display = eink_gizmo.EInk_HD_Gizmo()

# Create a display group for our screen objects
display_group = displayio.Group()

# Display a ruler graphic from the root directory of the CIRCUITPY drive
with open("/display-ruler.bmp", "rb") as file:
    picture = displayio.OnDiskBitmap(file)
    # Create a Tilegrid with the bitmap and put in the displayio group
    sprite = displayio.TileGrid(picture, pixel_shader=displayio.ColorConverter())
    display_group.append(sprite)

    # Place the display group on the screen
    display.show(display_group)

    # Refresh the display to have it actually show the image
    # NOTE: Do not refresh eInk displays sooner than 180 seconds
    display.refresh()
    print("refreshed")

    time.sleep(180)