Touch Screen library assumes 10 bit A/D?

[professorwade]

Question: I noticed a number of 1024 and 1023 in the TouchScreen library and wonder if it is related to an assumption of a 10 bit A/D (i.e. Arduino 8-bit)? I am using the library with a SAMD51 part (Grand Central) and notice that the values tend to be much higher on the pressure.

Adafruit_TouchScreen/TouchScreen.cpp

Line 155 in 28e6e74

y = (1023 - samples[NUMSAMPLES / 2]);

[MaitrePoulier]

I came to the exact same conclusion for the ESP32-S2 wich have an ADC of 13 bits.
If you chage the 6 instances of the number 1023 with the #bits^2 (8191 in my case) it should work.

[ladyada]

probably best to just set the adc resolution in the examples before use - wanna try that?
https://www.arduino.cc/reference/en/language/functions/zero-due-mkr-family/analogreadresolution/

[MaitrePoulier]

The problem with analogreadresolution() is that is work only with the: Zero, Due & MKR Family, not the ESP32-S2

[ScruffR]

I just filed a pull-request to solve that problem
#43