Hai......, I am using STM32F746IGT and 7 inch 1024x600 LCD display both are WAVESHARE development board,software used Stm32cubeIDE and TouchGFX, after downloading the program display in white screen error, develop the program follow by tutorial videos

[GMano.1]

I am using QUADSPI in add module

[Tesla DeLorean]

Perhaps you should start with some working examples from WaveShare, and then compare the register setting and initialization done by your new code, and how that differs?