Basic Touch

#include <Wire.h>
#include <PCA9557.h> //PCA9557-arduino v1.0.0
#include <TAMC_GT911.h> //TAMC_GT911 by TAMC v 1.0.9
#include <LovyanGFX.hpp> //LovyanGFX v1.2.0
#include "gfx_conf.h" // part of this build

#define TOUCH_SDA  19
#define TOUCH_SCL  20
#define TOUCH_INT -1
#define TOUCH_RST -1
#define TOUCH_WIDTH  800
#define TOUCH_HEIGHT 480

TAMC_GT911 tp = TAMC_GT911(TOUCH_SDA, TOUCH_SCL, TOUCH_INT, TOUCH_RST, TOUCH_WIDTH, TOUCH_HEIGHT);
PCA9557 Out;



void setup() {
  tp.begin(0x5D); // sets up the touch instance
  tp.setRotation(ROTATION_INVERTED); // set it to landscape, 0,0 top left with usb on left


  Wire.begin(19, 20); // talk to the IO Expander chip PCA9557
  // now we're going to 'reset' the touch panel.
  Out.reset();
  Out.setMode(IO_OUTPUT);
  Out.setState(IO0, IO_LOW); // takes the reset pin of the GT_911 low
  Out.setState(IO1, IO_LOW); // takes the ??INTE (poss interrupt) pin low
  delay(20);                 // wait for timings
  Out.setState(IO0, IO_HIGH);// release reset pin
  delay(100);                // wait for timing again
  Out.setMode(IO1, IO_INPUT);// set the intE pin as input again
  delay(2000);

  lcd.begin(); // start the lcd
  lcd.fillScreen(0x6ecb); // set it to a colour of choice
  lcd.setTextFont(&fonts::FreeMonoBold9pt7b);
  lcd.setTextSize(2);
  lcd.setTextColor(TFT_BLUE,TFT_WHITE);
}

void loop() {
  tp.read();
   if (tp.isTouched){
    for (int i=0; i<tp.touches; i++){
        Serial.printf(" Touch point %i, X =%i, Y =%i \n\r",i,tp.points[i].x, tp.points[i].y);
        lcd.fillCircle(tp.points[i].x, tp.points[i].y, 10, TFT_WHITE);

        lcd.setCursor(tp.points[i].x,tp.points[i].y);
        lcd.print(String(i));
    }
   }

}