LCD touch not working beyond the pixel 480 on a 800 x 480 STM32F746G_DISCO after replacing with NHD-4.3-800480EZ-ASXP-CTP (EK9716B : is the display and FT7311 : is the Touch controller)

[XP.1]

STM32F746G_DISCO by default has 480 x 272 . We changed the display to 800 x 480 (EK9716B LCD and FT7311 Touch controller) . 

Then we used the TouchGFX 4.17 / 4.16 to generate the code and updated the parameters to reflect 800 x 480.

The 800x480 images are displayed properly on the LCD.

When we touch the screen at any pixel beyond 480, we can see that STM32TouchController::sampleTouch (x, y) does indeed detect touch.

However the user code in flexButtonCallbackHandler ( ) is not getting called by TouchGFX framework

The same code works well for Simulator.

The lower lever I2C Touch controller driver detects the touch and during debug with disco-board, shows the correct coordinates.

Did anyone face a similar problem ? Why do you think, TouchGFX framework is not calling the user code for a pixel > 480 ?

[KM.9]

@Martin KJELDSEN​  Can you please look into above query and let us know if you have any pointers for debugging the same.

[Martin KJELDSEN]

Hi - Just got back from vacation.

If touch is detected but a certain widget is not receiving touch, please verify that the coordinates read are actually where the widget is located.

[sks9691901]

Can you please tell me how you interacted with the touch panel? I am also using the same New Haven display (EK9716B LCD and FT7311 Touch controller) for my application. I have used 4.7K pullup on SDA and SCL lines. I am able to read/write FT7311 registers but cannot get the correct touch points. I am also able to detect the number of touchpoints correctly. Can you please provide any reference on how you implemented your touch functions for FT7311?

I have attached the display datasheet.

Thank You.