Screen stuck on blank page

Using Arduino Displays
1

Hello guys,
I'm currently working on a school based project, and a part of this project need an arduino screen.
So we decided with my teacher to buy:
-an Arduino Mega (this model: https://www.amazon.fr/gp/product/B06XKZY117/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1)
-an screen (this screen: https://www.aliexpress.com/item/3-8-3-95-inch-320-480-TFT-Color-LCD-Display-Module-Screen-ILI9486-9488-Drive/32916041971.html?spm=a2g0s.9042311.0.0.3da24c4dV8CfmA)
We also decided to connect the arduino mega, with the screen directly via connectors included (just clip pins).
But unfortunately, the screen is stuck on white screen. Nothing happens.
I tried many libraries, but nothings changes...
Can someone help me?
I really need that to work.
Thanks,
Tom

2

Thanks for the links to your Mega2560 and your screen.
It means that people can give you an accurate answer in one reply.

  1. The LCD_RD pin does not work. The display is write-only.

  2. The LCD uses an 8 Bit data bus. UTFT and other libraries expect a 16 bit data bus.

  3. The Touch controller is hard-wired to the SPI bus.

  4. The XPT2046 chip-select pin is digital #53

  5. The SD Card chip-select pin is digital #48

  6. Install MCUFRIEND_kbv and Adafruit_GFX libraries via the IDE Library Manager..

  7. Edit utility/mcufriend_shield.h to #define USE_SPECIAL

  8. Edit utility/mcufriend_special.h to #define USE_MEGA_8BIT_SHIELD

  9. In your sketch setup() you must force the controller ID e.g. tft.begin(0x9486);

Please do not use flying wires to connect the Shield.
God invented Shields so that they can plug into your Mega2560.

You must use a proper hardware library for the Touch e.g. XPT2046_Touchscreen.h

It is a little different to most Mega2560 shields but everything should work ok.

David.

Edit. Added numbered steps. Added the CS pin numbers for Touch and microSD.

3

david_prentice:
Thanks for the links to your Mega2560 and your screen.
It means that people can give you an accurate answer in one reply.

The LCD_RD pin does not work.
The LCD uses an 8 Bit data bus. UTFT and other libraries expect a 16 bit data bus.
The Touch controller is hard-wired to the SPI bus.

Install MCUFRIEND_kbv and Adafruit_GFX libraries via the IDE Library Manager..
Edit utility/mcufriend_shield.h to #define USE_SPECIAL
Edit utility/mcufriend_special.h to #define USE_MEGA_8BIT_SHIELD
In your sketch setup() you must force the controller ID e.g. tft.begin(0x9486);

Please do not use flying wires to connect the Shield.
God invented Shields so that they can plug into your Mega2560.

You must use a proper hardware library for the Touch e.g. XPT2046_Touchscreen.h

It is a little different to most Mega2560 shields but everything should work ok.

David.

Hello David.
Thanks for your help, so precious.
I followed all your instructions, but the screen stay white.
I modified lines as you said, and add the id as you said.
You advise me to change my screen?
Thanks
Tom

4

It should work.

Make notes on paper as you complete each step.

The "edits" are very simple. You just remove the two slash characters //

Every male pin on the shield should mate with a corresponding female socket.

David.