//set variables for MultiTasking Template, here 5 tasks
uint32_t previousMillis_1; 
uint32_t previousMillis_2; 
uint32_t previousMillis_3;
uint32_t previousMillis_4;  
uint32_t previousMillis_5; 

//here 1000 = 1 second
uint32_t task1Time = 1000; 
uint32_t task2Time = 50; 
uint32_t task3Time = 1000;
uint32_t task4Time = 1000;
uint32_t task5Time = 1000;

uint32_t currentTime;
//END set variables for Pico_MultiTasking_Template

//define GPIO here
uint8_t SW1   =2;
uint8_t LED1  =3;
uint8_t LED2  =4;
uint8_t LED3  =5;

//define global variables here
bool flag_1;
bool flag_Interrupt1;
bool flag_countUP_DOWN; //0=up, 1=down

//set Timer PWM here
uint32_t freq = 500; //100...1MHz
uint32_t PWMresolution = 8; //can set 1…16, 
int32_t  dutyCycle0;

//Interrupt Service Routine here
void ISR_SW1() { 
    flag_Interrupt1 = 1; //set flag
}

void setup() {
  Serial1.begin(115200);
  Serial1.println("Hello, Cute Student");

  analogWriteFreq(freq);
  analogWriteResolution(PWMresolution);
  //set GPIO here
  pinMode(LED1, OUTPUT);
  pinMode(LED2, OUTPUT);
  pinMode(LED3, OUTPUT);
  pinMode(SW1, INPUT_PULLUP);
  attachInterrupt(SW1, ISR_SW1, FALLING);
  //LOW, HIGH, CHANGE, FALLING, RISING
  noInterrupts(); //Disable interrupt
  interrupts(); //Enable interrupt
}

void loop() {
   currentTime = millis();  //read current time for Multi-Tasks

//Task1 หลอดไฟ LED1 & LED2 ติดสลับกันที่นี่ 
  if (currentTime - previousMillis_1 >= task1Time) {
    previousMillis_1 = currentTime;
    if(flag_1) {
        digitalWrite(LED1, HIGH);
        digitalWrite(LED2, LOW);
    }
    else {
        digitalWrite(LED1, LOW);
        digitalWrite(LED2, HIGH);
    }
    flag_1 = !flag_1; //flag_1 toggle!
  } //End Task1

//Task2 for interrupt operation%
  if (currentTime - previousMillis_2 >= task2Time) {
    previousMillis_2 = currentTime;
    if(flag_Interrupt1){
      if(!flag_countUP_DOWN) //LED up
         {
             analogWrite(LED3, dutyCycle0);
             Serial1.println(dutyCycle0);
             dutyCycle0 += 10; //Fading
             if(dutyCycle0 >= 255){
                dutyCycle0=255;
                flag_countUP_DOWN = 1; //for next LED down
             }
         }
      if(flag_countUP_DOWN) //LED down%
         {
             analogWrite(LED3, dutyCycle0);
             Serial1.println(dutyCycle0);
             dutyCycle0 -= 10; //Fading
             if(dutyCycle0 <= 0){
                digitalWrite(LED3, LOW);
                dutyCycle0=0;
                flag_countUP_DOWN = 0; //for next LED up
                flag_Interrupt1 = 0; //Clear Interrupt
             }
         }
    }
  }  //End Task2

//Task3  ///////////////////////////////
  if (currentTime - previousMillis_3 >= task3Time) {
    previousMillis_3 = currentTime;

  }  //End Task3

//Task4  ///////////////////////////////
  if (currentTime - previousMillis_4 >= task4Time) {
    previousMillis_4 = currentTime;

  }  //End Task4

//Task5  ///////////////////////////////
  if (currentTime - previousMillis_5 >= task5Time) {
    previousMillis_5 = currentTime;

  }  //End Task5
} //End Program here ////////////////////////////////////