Hello. Can someone advise me how to activate the touch on the ILI9486? I am using ESP32 DEVKIT V1 and Adafruit_GFX, MCUFRIEND_kbv and TouchScreen libraries.
I am using Arduino IDE 2.2.1 and Visual Studio Code with Platformio IDE
Sorry for the English, but I'm translating it from Czech using Google.
/*
Test MCU Friend parallel display and resistive touchscreen by drawing touch points
on screen, use something pointed for more accuracy
Need this modified Touchscreen library and one of:
- TFT_eSPI much faster for ESP32, must select correct display driver
- MCUFRIEND_kbv more display driver support, auto detects display driver
*/
//#define TFT_eSPIlib // comment out to use MCUFRIEND_kbv
#ifdef TFT_eSPIlib
#include <TFT_eSPI.h>
TFT_eSPI tft = TFT_eSPI();
#else
#include <MCUFRIEND_kbv.h>
MCUFRIEND_kbv tft;
#endif
#include <TouchScreen.h>
// adjust pressure sensitivity - note works 'backwards'
#define MINPRESSURE 200
#define MAXPRESSURE 1000
// some colours to play with
#define BLACK 0x0000
#define BLUE 0x001F
#define RED 0xF800
#define GREEN 0x07E0
#define CYAN 0x07FF
#define MAGENTA 0xF81F
#define YELLOW 0xFFE0
#define WHITE 0xFFFF
// Either run TouchScreen_Calibr_native.ino and apply results to the arrays below
// or just use trial and error from drawing on screen
// ESP32 coordinates at default 12 bit resolution have range 0 - 4095
// however the ADC cannot read voltages below 150mv and tops out around 3.15V
// so the actual coordinates will not be at the extremes
// each library and driver may have different coordination and rotation sequence
const int coords[] = {3800, 500, 300, 3800}; // portrait - left, right, top, bottom
const int rotation = 0; // in rotation order - portrait, landscape, etc
const int XP = 27, XM = 15, YP = 4, YM = 14; // default ESP32 Uno touchscreen pins
TouchScreen ts = TouchScreen(XP, YP, XM, YM, 300);
void setup() {
Serial.begin(115200);
#ifdef TFT_eSPIlib
Serial.println("TFT_eSPI library");
tft.begin();
#else
Serial.println("MCUFRIEND_kbv library");
idDisplay();
#endif
// screen orientation and background
String orientation;
switch (rotation) {
case 0:
orientation = "Portrait";
break;
case 1:
orientation = "Landscape";
break;
case 2:
orientation = "Portrait Inverted";
break;
case 3:
orientation = "Landscape Inverted";
break;
}
Serial.println(orientation);
tft.setRotation(rotation);
tft.fillScreen(BLACK);
}
void loop() {
// display touched point with colored dot
uint16_t pixel_x, pixel_y;
boolean pressed = Touch_getXY(&pixel_x, &pixel_y, true);
}
boolean Touch_getXY(uint16_t *x, uint16_t *y, boolean showTouch) {
TSPoint p = ts.getPoint();
pinMode(YP, OUTPUT); //restore shared pins
pinMode(XM, OUTPUT);
digitalWrite(YP, HIGH); //because TFT control pins
digitalWrite(XM, HIGH);
bool pressed = (p.z > MINPRESSURE && p.z < MAXPRESSURE);
if (pressed) {
switch (rotation) {
case 0: // portrait
*x = map(p.x, coords[0], coords[1], 0, tft.width());
*y = map(p.y, coords[2], coords[3], 0, tft.height());
break;
case 1: // landscape
*x = map(p.y, coords[1], coords[0], 0, tft.width());
*y = map(p.x, coords[2], coords[3], 0, tft.height());
break;
case 2: // portrait inverted
*x = map(p.x, coords[1], coords[0], 0, tft.width());
*y = map(p.y, coords[3], coords[2], 0, tft.height());
break;
case 3: // landscape inverted
*x = map(p.y, coords[0], coords[1], 0, tft.width());
*y = map(p.x, coords[3], coords[2], 0, tft.height());
break;
}
if (showTouch) tft.fillCircle(*x, *y, 2, YELLOW);
}
return pressed;
}
#ifndef TFT_eSPIlib
void idDisplay() {
// MCUFRIEND_kbv library only
uint16_t ID = tft.readID();
Serial.print("TFT ID = 0x");
Serial.println(ID, HEX);
if (ID == 0xD3D3) ID = 0x9486; // write-only shield
tft.begin(ID);
}
#endif
