Unipolar motor driver

sbit T1 at PORTB1_bit;
sbit T2 at PORTB2_bit;
sbit T3 at PORTB3_bit;
sbit T4 at PORTB4_bit;
sbit dir at PORTD0_bit;
sbit step at PORTC5_bit;

void main() {
char krok;
krok = 5;
do{
if (Button(&PORTC,5, 1, 1)){
   if (dir == 1) krok +=1;
   if (dir == 0) krok -=1;
   }
krok = abs(krok);
if (krok >= 5) krok = 1;
if (krok == 0) krok = 4;

if (krok == 1){
   T1 = 1; T2=1; T3=0; T4=0;
   }

krok = abs(krok);
if (krok == 2){
   T1 = 0; T2=1; T3=1; T4=0;
   }

krok = abs(krok);
if (krok == 3){
   T1 = 0; T2=0; T3=1; T4=1;
   }

krok = abs(krok);
if (krok == 4){
   T1 = 1; T2=0; T3=0; T4=1;
   }

krok = abs(krok);

}while(1);
}