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Hi,
thank you for your help, but using software SPI does not fix it.
I've try also non SPI Port as software SPI no luck.
What bothers written in C it works fine.

P.S: Sorry for double-posting I found the right forum after making the first post.

Hi,
I try to wire my LED Matrix(MAX7219) up to a ESP32 DEVKIT V1. To my knowledge, this code should turn all LEDs on:

SPI2.setup({mosi:D23, sck:D18});
    let g = require('MAX7219').connect(SPI2,D5,4);
    g.displayTest(true);

but nothing happens. At the start all LEDs flicker and than turn off or stay lit in random patterns.
I double checked the wiring . I'm trying to connect via VSPI Ports on the board.