#define BIT(x) (1 << (x))

/* How to Use
 PORTA |= BIT(0); //ON
 PORTA &= ~BIT(0); //OFF
 PORTA ^= BIT(0); //TOGGLE
 if (PORTB & BIT(4)) //Read pin 4
*/

#define SETBIT(p,b) (p) |= BIT(b)
#define CLRBIT(p,b) (p) &= ~BIT(b)
#define TGLBIT(p,b) (p) ^= BIT(b)

/* How to Use
 SETBIT(PORTA,0);
 CLRBIT(PORTA,0);
 TGLBIT(PORTA,0);
*/