waiting for two inputs

Using Arduino Project Guidance
9

sorry for that

this is the code I'm using now:

#include <avr/io.h>
#include <avr/interrupt.h>

void setup() {
  // put your setup code here, to run once:
  noInterrupts();
  pinMode(9, OUTPUT);
  pinMode(10, OUTPUT);
  TCCR2A = _BV(COM2A1) | _BV(COM2B1) | _BV(WGM20);
  TCCR2B = _BV(CS22);
  OCR2A = 0;
  OCR2B = 0;
  TCNT2 = 0;
  interrupts();

  attachInterrupt(digitalPinToInterrupt(2), t1_ISR, RISING);     //enable interrupt service routines on pins 2 and 3
  attachInterrupt(digitalPinToInterrupt(3), t2_ISR, RISING);
}

volatile unsigned int t1;
volatile unsigned int t2;
volatile unsigned int oldt1 = 0;
volatile unsigned int oldt2 = 0;

void loop() {
  // put your main code here, to run repeatedly:
  while((t1 != oldt1) && (t2 != oldt2)){
    if(t1<t2){
      OCR2A = t2-t1;   //duty cycle   50%
      OCR2B = 0;
    }
    else if(t2<t1){
      OCR2B = t1-t2;
      OCR2A = 0;
    }
  }
  oldt1 = t1;
  oldt2 = t2;
}

void t1_ISR(){
  t1 = TCNT2;
}

void t2_ISR(){
  t2 = TCNT2;
}