@laurianhurduza, Hi, welcome to the forum!
In the Displays section of the forum it is appreciated if you provide links to the display and devices in question, such as:
3.5inch Touch LCD Shield for Arduino (waveshare.com)
Please also read How to get the best out of this forum if you haven't done yet.
Your display uses SPI, with the same "special" SPI circuit as their RPi SPI displays.
I don't have this display yet, but I did a library for this kind of displays:
GitHub - ZinggJM/ILI9486_SPI: ILI9486_SPI for Arduino
You could give it a try. Note that it has no touch support.
Jean-Marc