Hi David, I downloaded both "XPT2046_Touchscreen" and "XPT2046_Calibrated" libraries.
I got the "XPT2046_Touchscreen" library example "TouchTest" to work after I changed the CS_PIN and TIRQ_PIN:
From
#define CS_PIN 8
#define TIRQ_PIN 2
To
#define CS_PIN 53
#define TIRQ_PIN 255
The Serial Monitor gives me various readings as I move my stylus, as below.
Pressure = 1078, x = 896, y = 932
Pressure = 2430, x = 835, y = 1081
Pressure = 2494, x = 922, y = 1171
Pressure = 2450, x = 1115, y = 1258
Pressure = 2463, x = 1374, y = 1401
Pressure = 2475, x = 1613, y = 1619
Pressure = 2435, x = 1817, y = 1895
Pressure = 2374, x = 2138, y = 2281
Pressure = 2310, x = 2541, y = 2648
Pressure = 2185, x = 2866, y = 2956
Pressure = 2163, x = 3019, y = 3174
Pressure = 2325, x = 3018, y = 3225
Pressure = 2011, x = 3019, y = 3171
My next step was to calibrate my screen using the example "TouchCalibration" from the "XPT2046_Calibrated" library.
As before I modified the CS_PIN.
#define CS_PIN 53
And I forced the ID = 0x7796.
I have mixed results.
The screen is white and I see no cross-hairs. Something is clearly not working here.
However, when I touch the screen in different places I get the following from the Serial Monitor:
XPT2046_TouchScreen.h
Not possible to diagnose Touch pins on ARM or ESP32
ID = 0x7796
cx=3688 cy=626 cz=300 X, Y, Pressure
cx=3748 cy=3634 cz=300 X, Y, Pressure
cx=2021 cy=453 cz=300 X, Y, Pressure
cx=2108 cy=3555 cz=300 X, Y, Pressure
cx=495 cy=549 cz=300 X, Y, Pressure
cx=415 cy=3588 cz=300 X, Y, Pressure
cx=1778 cy=2306 cz=300 X, Y, Pressure
cx=2601 cy=2257 cz=300 X, Y, Pressure
*** COPY-PASTE from Serial Terminal:
const int TS_LANDSCAPE=1; //XPT2046_TouchScreen.h
const int TS_LEFT=1518,TS_RT=2769,TS_TOP=2082,TS_BOT=1692;
PORTRAIT CALIBRATION 240 x 320
x = map(p.x, LEFT=1518, RT=2769, 0, 240)
y = map(p.y, TOP=2082, BOT=1692, 0, 320)
LANDSCAPE CALIBRATION 320 x 240
x = map(p.y, LEFT=2082, RT=1692, 0, 320)
y = map(p.x, TOP=2769, BOT=1518, 0, 240)
*** UNUSUAL CALIBRATION RANGES 1251 -390
Any idea what I am missing to get both the display and touchscreen to work simultaneously (my display is 320x480)?