volatile bool isrunning = 0;

ISR(TIM1_COMPA_vect) {
  if (!isrunning++) {
    sei();
    if (currentStep < 100)
      currentStep += 1;
    else
      currentStep = 0;
    for (uint8_t x = 0; x <= 9; x++)
      (currentStep < pwmled[x]) ? (x < 8 ? PORTA |= (1 << p[x]) : PORTB |= (1 << p[x])) : (x < 8 ? PORTA &= ~(1 << p[x]) : PORTB &= ~(1 << p[x]));
    isrunning = 0;
  }
}