Stuck on an issue?

Lightrun Answers was designed to reduce the constant googling that comes with debugging 3rd party libraries. It collects links to all the places you might be looking at while hunting down a tough bug.

And, if you’re still stuck at the end, we’re happy to hop on a call to see how we can help out.

Black screen with SPI

See original GitHub issue

I can initialize the display but the example code gives me black screen. The same display works with I2C.

Adafruit CircuitPython 7.3.0-alpha.0-38-g862210b3f-dirty on 2022-03-24; Adafruit Feather M4 Express with samd51j19
Board ID:feather_m4_express

import board
import busio
import displayio
import adafruit_displayio_ssd1306
import sys

displayio.release_displays()

try: 
	spi = busio.SPI(board.SCK, MOSI=board.MOSI, MISO=board.MISO)

	display_bus = displayio.FourWire(spi_bus=spi, command=board.D10, chip_select=board.D11, reset=board.D9, baudrate=10000000)

	display = adafruit_displayio_ssd1306.SSD1306(display_bus, width=128, height=64)

	splash = displayio.Group()
	display.show(splash)

	color_bitmap = displayio.Bitmap(120, 50, 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)

	while True:
		pass

except (KeyboardInterrupt) as e:
	spi.unlock()
	sys.exit(0)

Issue Analytics

State:
Created a year ago
Comments:11 (5 by maintainers)

Top GitHub Comments

1reaction

muranyiacommented, Apr 19, 2022

It was me soldering the jumpers together - your questions helped me find the problem. Thanks!

0reactions

muranyiacommented, Oct 11, 2022

Yes. Jumper on, contrary to the wrong label.

On Wed, Apr 6, 2022, 21:38 ladyada @.***> wrote:

is the display in SPI mode?

— Reply to this email directly, view it on GitHub https://github.com/adafruit/Adafruit_CircuitPython_SSD1306/issues/72#issuecomment-1090689566, or unsubscribe https://github.com/notifications/unsubscribe-auth/ABZWGYCBDUWNU3N4QTRTIO3VDXR5BANCNFSM5SXDDZPQ . You are receiving this because you authored the thread.Message ID: @.***>