Bit of a noob here on this device. I just loaded circuitpython 9.0.4 on a lilygo_tdisplay_s3 device. Install went fine. I grabbed the adafruit_ST7789 library file and attempted to run the example from https://docs.circuitpython.org/projects/st7789/en/latest/examples.html. However this device does not have an SPI object under board. if I perfom a dir(board) I get:
['class', 'name', 'BATTERY', 'BUTTON0', 'BUTTON1', 'DISPLAY', 'IO0', 'IO1', 'IO10', 'IO11', 'IO12', 'IO13', 'IO14', 'IO16', 'IO17', 'IO18', 'IO2', 'IO21', 'IO3', 'IO43', 'IO44', 'LCD_BCKL', 'LCD_CS', 'LCD_D0', 'LCD_D1', 'LCD_D2', 'LCD_D3', 'LCD_D4', 'LCD_D5', 'LCD_D6', 'LCD_D7', 'LCD_DC', 'LCD_POWER_ON', 'LCD_RD', 'LCD_RST', 'LCD_WR', 'STEMMA_SCL', 'STEMMA_SDA', 'TOUCH_INT', 'TOUCH_RES', 'TOUCH_SCL', 'TOUCH_SDA', 'dict', 'board_id']. Note that there is no SPI object. Is that library not compatible with this board? If so, how will I write to the display?
#Using Adafruit_st7789 library on lilygo_tdisplay_s3
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true hatch
I don't have specific experience with that device, but it looks to me like the display is initialized in the core: https://github.com/adafruit/circuitpython/blob/main/ports/espressif/boards/lilygo_tdisplay_s3/pins.c#L54 so you shouldn't need to use the library or initialize it yourself unless you're trying to do something more than just draw some stuff to it.
You should be able to just use board.DISPLAY and start drawing stuff by settings the root_group to a Group that you want to display. I haven't actually run it but something like this should work I think:
import board
import terminalio
import displayio
from adafruit_display_text import label
display = board.DISPLAY
# Make the display context
splash = displayio.Group()
display.root_group = 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(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
One caveat being, if you already ran the other code that contains displayio.release_displays() then you will need to powercycle the device after you change your code.py file to not have that anymore.
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Thanks. I will give that a shot and let you know.
high marsh
Just for future reference, there is no SPI object because that display isn't an SPI display. It's an 8 bit parallel (i80) display. Easiest to use the initialized display from the board.DISPLAY, but you can also manually re-initialize it if you need to, using the paralleldisplay bus library, instead of the spi/fourwire library as the bus.