Get Touch coordinates

marcosbontempo · May 17th 2016, 4:13pm

Hello,

I want do develop an application that gets the X an Y coordinates of the point which was touched in a LCD. I read about the functions GUI_TOUCH_GetState(), but I don't know how to implement it. Do I need to create a callback function? Does anybody has a simple example?

Any tip will be very helpful,
Thanks

amit251291 · May 18th 2016, 5:57am

Hi marcosbontempo,

GUI_TOUCH_GetState() will tell you if touch screen is pressed or not.. There is another API called "GUI_TOUCH_StoreState".. This you can call from interrupt routine .. As soon as screen is touched you should get an interrupt then use this api to store the co-ordinates.. you can make use of this sample code :
Sample\GUI_X\GUI_X_Touch_StoreState.c

SEGGER - Schoenen · May 18th 2016, 4:54pm

Hi,

Yes, amit is right.

You need to read touch data from the touchcontroller and fill the emWin touch buffer with a call of GUI_TOUCH_StoreState().

Attached you will find a sample file which should show how we do it in most cases. Of course this depends on the used touch controller.

The sample attached is from project for a STM32F4x9i Eval.

Regards,
Sven

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