rm-hull
SSD1306 not working via SPI
Type of Raspberry Pi
tested on both RPi 1 B+ and RPi 3 B+
Linux Kernel version
Linux raspberrypi 4.14.70+ #1144 Tue Sep 18 17:20:50 BST 2018 armv6l GNU/Linux
Expected behaviour
I expect an image on the display
Actual behaviour
Nothing is happening
This is my wiring:
Please ignore the paper thing. The alignment is a bit wrong...
Display---RPI GND---GND VCC---3V3 DO---SPI0 SCLK D1---SPI0 MOSI RES---GPIO BCM 25 DC---GPIO BCM 24 CS---SPI0 CE0
my test code:
from luma.core.interface.serial import i2c, spi
from luma.core.render import canvas
from luma.oled.device import ssd1306, ssd1325, ssd1331, sh1106
from RPi import GPIO
GPIO.setmode(GPIO.BCM)
serial = spi(device=0, port=0, gpio=GPIO)
device = ssd1306(serial)
with canvas(device) as draw:
draw.rectangle(device.bounding_box, outline="white", fill="black")
draw.text((30, 40), "Hello World", fill="white")
input()
GPIO.cleanup()
My SSD1306 I²C displays are working with similar code. Why is this not working?
You should let the luma code manage the GPIO to get a working baseline. I highly suspect that it is down to setting the GPIO mode
I also tried without initializing the GPIO and not setting the gpio parameter. It didn't work, too.
Raphael
Richard Hull [email protected] schrieb am Di., 9. Okt. 2018, 16:19:
You should let the luma code manage the GPIO to get a working baseline. I highly suspect that it is down to setting the GPIO mode
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Looks like I have the exact same display and wiring. (I have the same code minus managing GPIO)
Sometimes it flashes white for a millisecond, but most of the time it's a black screen.
If you are using SPI, you should use the gpio_RST and gpio_DC funktions to make it work Something like this: serial = spi(device=0, port=0, gpio_DC=16, gpio_RST=18)
where GPIO 16 and 18 on your PI are connected to your display DC and RST or RES
