#include "SPI.h"
#include "Adafruit_GFX.h"
#include "Adafruit_ILI9341.h"

#define TFT_DC 9
#define TFT_CS 10
Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC);

int counter=0;
String dir="";
unsigned long last_run=0;

void setup() {
  Serial.begin(9600);
  attachInterrupt(digitalPinToInterrupt(3), shaft_moved, FALLING);
  pinMode(4 , INPUT);
  pinMode(2 , INPUT_PULLUP);
}

void shaft_moved(){
  if (millis()-last_run>5){
    if (digitalRead(4)==1){
      counter++;
      dir="CW";
      }
    if (digitalRead(4)==0){
      counter--; 
      dir="CCW";}
    last_run=millis();
  }
}

void loop() 
{
 tft.begin();
  tft.setRotation(0);              //顯示方向
  tft.setCursor(0, 0);             //顯示位置
  tft.setTextColor(ILI9341_RED);   //字體方向
  tft.setTextSize(4);              //字體大小
  tft.println("Hello TFT!");

  Serial.print("counter : ");
  Serial.print(counter);
  Serial.print(" direction : ");
  Serial.println(dir);  

  tft.setCursor(80, 160);
  tft.setTextColor(ILI9341_GREEN);
  tft.setTextSize(10);
  tft.println(counter );
   tft.fillScreen(ILI9341_BLACK);

  if(digitalRead(2==1))
  {
      counter==0;
  }
}