Not able to get ST7789 running

[cyberjunkiefr]

Hello,
I've just got a new LilyGo-T-Display-s2.
As Firmware I've loaded the micropython firmware found on MicroPython.con ESP32-S2 port (GENERIC_S2-20211212-unstable-v1.17-231-g0892ebe09.bin)
Everything is working fine for micropython, no issues there.
I took an example program for testing the ST7789 and adapted it for my board and micropython.
The program is running without any errors,
I can see the backlight coming on, but the display isn't showinf anything,
Some where I must have made a mistake in the pins for the display (SoftSPI), but I just can't figure it out.
Maybe somebody can help.
here's the progam I use:

import random
import machine
from machine import Pin, SPI, SoftSPI
import st7789py as st7789
import time
backlight = Pin(33, Pin.OUT)
backlight.value(1)
#spi = SPI(1, baudrate=40000000, polarity=1, sck=Pin(36), mosi=Pin(35), miso=Pin(37))
spi = SoftSPI(baudrate=500000, sck=Pin(36), mosi=Pin(35), miso=Pin(37))
display = st7789.ST7789(
spi, 240, 240,
reset=machine.Pin(38, Pin.OUT),
dc=machine.Pin(37, Pin.OUT),
)
display.init()
while True:
display.fill(
st7789.color565(
random.getrandbits(8),
random.getrandbits(8),
random.getrandbits(8),
),
)
# Pause 2 seconds.
time.sleep(2)

I'm thankfull for any support I can get.

Roel Jaspers

[NilsBe]

Managed to make it work.

"""
lines.py
    Draws lines and rectangles in random colors at random locations on the
    display.
"""
import random
from machine import Pin, SPI, SoftSPI
import st7789py as st7789

def main():
    spi = SoftSPI(
        baudrate=20000000,
        polarity=1,
        phase=0,
        sck=Pin(36),
        mosi=Pin(35),
        miso=Pin(4))
    
    tft = st7789.ST7789(
        spi,
        135,
        240,
        reset=Pin(38, Pin.OUT),
        cs=Pin(34, Pin.OUT),
        dc=Pin(37, Pin.OUT),
        backlight=Pin(33, Pin.OUT),
        rotation=0)

    tft.fill(st7789.BLUE)

    while True:
        tft.line(
            random.randint(0, tft.width),
            random.randint(0, tft.height),
            random.randint(0, tft.width),
            random.randint(0, tft.height),
            st7789.color565(
                random.getrandbits(8),
                random.getrandbits(8),
                random.getrandbits(8)
                )
            )

        width = random.randint(0, tft.width // 2)
        height = random.randint(0, tft.height // 2)
        col = random.randint(0, tft.width - width)
        row = random.randint(0, tft.height - height)
        tft.fill_rect(
            col,
            row,
            width,
            height,
            st7789.color565(
                random.getrandbits(8),
                random.getrandbits(8),
                random.getrandbits(8)
            )
        )

main()