STM32F407G, ILI9341, LVGL - white screen, can't display anything

[FilipCichowski]

I followed this tutorial: https://controllerstech.com/lvgl-on-stm32-part-1/
I double check my connections.
I use Discovery board with STM32F407G.
My display module is popular 2,8" display with ILI9341
controller.
The only change I introduced comparing to tutorial is reducing buffer size in line 52 of lv_conf.h to 16 bytes, because it didn't fit my RAM.
I copied 1:1 LCDController.h from file attached to tutorial (just scroll to the bottom to download it).
I added lv_timer_handler in main loop.
I added systic handler in stm32l4xx_it.c

But I get white screen as a result. What else should I check?
Any help will be appreciated!

[eugene]

A common reason for this is that the SPI mode is not set correctly. There are four possible combinations of polarity and phase resulting in four modes to choose from. Typically it's set during an init() function, but I don't know how it's handled in Cube. Figure that out and try all four modes to see if one of them works.

[FilipCichowski]

I tried all 4 modes. I changed Clock Polarity and Clock Phase. I tried lowering baud rate, but it's no use.

[globoy]

Have you looked at your SPI bus with an oscilloscope and make sure you're actually sending data to the display controller?  I know in my past I've done things like get the wrong pin for CSn or D/C, etc.

Can you share a picture of the screen?  A pure white screen indicates to me that you haven't successfully sent any initialization commands to the display (so not even at the point where the LVGL buffer size matters).  An initialized (but not cleared) ILI9341 display will be all random pixel values.

[FilipCichowski]

Problem solved.
It was skill issue 
I accidentally connected RESET wire to PH1 instead of PC13.