Overflow while calibrationg touch screen (and possible solution)

[ullibak]

Hi

I ran into a problem when using the new Raspberry Pi Pico 2.

Setup: Raspberry Pi Pico 2 Waveshare Pico Res-Touch display with touch screen: https://www.waveshare.com/product/raspberry-pi/boards-kits/raspberry-pi-pico-cat/pico-restouch-lcd-3.5.htm?___SID=U Arduino IDE with TFT_eSPI library.

When using the Keypad_480x320 example, the touch screen seemed not to work. I found that the coordinate values were completely erroneous. Digging deeper into the issue I found that the new Pico 2 somehow gives much larger values for the touchscreen raw coordinates compared to the old Pico board. The values are large enough to cause an overflow in the calibration routine.

I hat to change line 229 of Extensions/Touch.cpp$ from

int16_t values[] = {0,0,0,0,0,0,0,0};

to

int32_t values[] = {0,0,0,0,0,0,0,0};

This fixed the problem but I am not sure if all the values that store raw coordinates should be changed to 32 bit variables. Thanks for checking this!