Make a screen work without using get_device() from demo_opts

I use a st7735 device on a RPI3b. It’s working if I use the get_device() function from demo_opts.py as in luma.examples. I use the following command :

python3 tst_luma.py --display st7735 --interface=spi --spi-bus-speed=16000000 --gpio-reset=24 --gpio-data-command=23 --gpio-backlight=18 --width=160 --height=128 --backlight-active=high --rotate=3

I’d like to define the rotation of the screen in my program. I tried these following lines instead of get_device() but it doesn’t work. Nothing is happening.

from luma.core.interface.serial import spi
from luma.lcd.device import st7735
serial = spi(port=0, device=0, gpio_DC=23, gpio_RST=24, cs_high=True, bus_speed_hz=16000000)
device = st7735(serial_interface=serial, width=160, height=128, rotate=3)

What am I doing wrong?

Thanks in advance

[raf59]

Perfect !!! Now, everything is working fine ! Thank you for your answer and also for this awesome library. Good job!

[rm-hull]

oh, you can pass active_low=True|False when initializing the device to indicate whether the backlight is active low or high