Add support for 8A

[curlyz]

Replace this

TIMSK2 = 0; // disable interrupts TCCR2A = 0; // normal counting mode TCCR2B = _BV(CS21); // set prescaler of 8 TCNT2 = 0; // clear the timer2 count TIFR2 = _BV(TOV2); // clear pending interrupts; TIMSK2 = _BV(TOIE2) ; // enable the overflow interrupt

With this
`#if defined (AVR_ATmega8) || defined (AVR_ATmega8A)

TIMSK = 0;  // disable interrupts 
bitClear(TCCR2,WGM20);
bitClear(TCCR2,WGM21);
TCCR2 = _BV(CS21);
TCNT2 = 0;      // clear the timer2 count 
TIFR = _BV(TOV2);
TIMSK =  _BV(TOIE2) ; // enable the overflow interrupt	  

#else
TIMSK2 = 0; // disable interrupts
TCCR2A = 0; // normal counting mode
TCCR2B = _BV(CS21); // set prescaler of 8
TCNT2 = 0; // clear the timer2 count
TIFR2 = _BV(TOV2); // clear pending interrupts;
TIMSK2 = _BV(TOIE2) ; // enable the overflow interrupt
#endif
`
This is a noob code :) It will need a proper coding