RA8875 - working resistive touch example?

Other Hardware Displays
1

I have this display:

Interface: 4 wire SPI
Screen: Resistive Touch
Controller: Arduino Uno

I am using the RA8875.h library: GitHub - sumotoy/RA8875: A library for RAiO RA8875 display driver for Teensy3.x or LC/Arduino's/Energia/Spark

The library is for an internal resistive touchscreen controller.

the RA8875.h library works fine for drawing. However, I can't get ANY of the resistive touch examples to run.

For instance, this example does not even compile:

#include <SPI.h>
#include <RA8875.h>


#define RA8875_INT 2 //any pin
#define RA8875_CS 10 //see below...

#define RA8875_RESET 9//any pin or nothing!

RA8875 tft = RA8875(RA8875_CS,RA8875_RESET);//Teensy3/arduino's


uint16_t tx, ty;


void interface(){
  tft.fillRect(10,10,40,40,RA8875_WHITE);
  tft.fillRect(10+(40*1)+(10*1),10,40,40,RA8875_BLUE);
  tft.fillRect(10+(40*2)+(10*2),10,40,40,RA8875_RED);
  tft.fillRect(10+(40*3)+(10*3),10,40,40,RA8875_GREEN);
  tft.fillRect(10+(40*4)+(10*4),10,40,40,RA8875_CYAN);
  tft.fillRect(10+(40*5)+(10*5),10,40,40,RA8875_MAGENTA);
  tft.fillRect(10+(40*6)+(10*6),10,40,40,RA8875_YELLOW);
  tft.drawRect(10+(40*7)+(10*7),10,40,40,RA8875_WHITE);
}

void setup() 
{
  Serial.begin(9600);
  //while (!Serial) {;}
  Serial.println("RA8875 start");

  tft.begin(RA8875_480x272);//initialize library

  tft.touchBegin(RA8875_INT);//enable Touch support!
  interface();
}

uint16_t choosenColor = 0;

void loop() 
{
  if (tft.touchDetect()){//easy!
      tft.touchReadPixel(&tx, &ty);//read directly in pixel!
      if (ty >= 0 && ty <= 55){ //interface area
        if ((tx > 10 && tx < (10+40))){
          choosenColor = RA8875_WHITE;
          interface();
          tft.fillRect(10,10,40,40,RA8875_BLACK);
          tft.fillCircle(tft.width()-10,10,5,choosenColor);
        } 
        else if ((tx > 10+(40*1)+(10*1) && tx < 10+(40*2)+(10*1))){
          choosenColor = RA8875_BLUE;
          interface();
          tft.fillRect(10+(40*1)+(10*1),10,40,40,RA8875_BLACK);
          tft.fillCircle(tft.width()-10,10,5,choosenColor);
        } 
        else if ((tx > 10+(40*2)+(10*2) && tx < 10+(40*3)+(10*2))){
          choosenColor = RA8875_RED;  
          interface();
          tft.fillRect(10+(40*2)+(10*2),10,40,40,RA8875_BLACK);
          tft.fillCircle(tft.width()-10,10,5,choosenColor);
        } 
        else if ((tx > 10+(40*3)+(10*3) && tx < 10+(40*4)+(10*3))){
          choosenColor = RA8875_GREEN;  
          interface();
          tft.fillRect(10+(40*3)+(10*3),10,40,40,RA8875_BLACK);
          tft.fillCircle(tft.width()-10,10,5,choosenColor);
        } 
        else if ((tx > 10+(40*4)+(10*4) && tx < 10+(40*5)+(10*4))){
          choosenColor = RA8875_CYAN;  
          interface();
          tft.fillRect(10+(40*4)+(10*4),10,40,40,RA8875_BLACK);
          tft.fillCircle(tft.width()-10,10,5,choosenColor);
        } 
        else if ((tx > 10+(40*5)+(10*5) && tx < 10+(40*6)+(10*5))){
          choosenColor = RA8875_MAGENTA;  
          interface();
          tft.fillRect(10+(40*5)+(10*5),10,40,40,RA8875_BLACK);
          tft.fillCircle(tft.width()-10,10,5,choosenColor);
        } 
        else if ((tx > 10+(40*6)+(10*6) && tx < 10+(40*7)+(10*6))){
          choosenColor = RA8875_YELLOW;  
          interface();
          tft.fillRect(10+(40*6)+(10*6),10,40,40,RA8875_BLACK);
          tft.fillCircle(tft.width()-10,10,5,choosenColor);
        } 
        else if ((tx > 10+(40*7)+(10*7) && tx < 10+(40*8)+(10*7))){
          choosenColor = 0;  
          interface();
          tft.fillRect(0,52,tft.width()-1,tft.height()-53,RA8875_BLACK);
          tft.fillCircle(tft.width()-10,10,5,RA8875_BLACK);
        }
      } else { //paint
        //if (choosenColor != 0) tft.fillCircle(tx,ty,1,choosenColor);
        if (choosenColor != 0) tft.drawPixel(tx,ty,choosenColor);
      }
  }
}

It compiles but only draws, no touchscreen, if you make a few changes:

tft.touchBegin(RA8875_INT); to tft.touchBegin();
tft.touchDetect() to tft.touched

Is there a working resistive touch example I can look at?

2

There is a sample code in Topway Technology's web site. It is for their LMT050DNCFWU-NFN. I think it uses RA8875 too.
Here is the sample code.
It is doing something like these。。。

 SdReg(0x70);SdCmd(0x93); //ADC frequency
 SdReg(0x71);SdCmd(0x41); //manual mode, use internal reference touch voltage
 SdReg(0x01);SdCmd(0x80);