Keil-Shift LED

#include <REGX52.H>
typedef unsigned char byte;

byte xdata LED_PREK _at_ 0x8000;
byte xdata PLAVE_LED _at_ 0x8003;
byte LEDS;
byte prek;
byte smer;

void poc_stanje(byte x )
{
    switch (x&0x03)
    {
        case 0:
            LEDS=~0x01;
            break;
        case 1:
            LEDS=~0x03;
            break;
        case 2:
            LEDS=~0x07;
            break;
        case 3:
            LEDS=~0x0f;
            break;
    }
}
void main()
{
    unsigned long i;
    prek=LED_PREK;
    poc_stanje(prek);

   while(1)
   {
        prek=LED_PREK;
        smer=(0x04&prek)>>2;
        if(smer==0x01)
            LEDS=(LEDS>>1)|((LEDS&0x01)<<7);
        else
            LEDS=(LEDS<<1)|((LEDS&0x80)>>7);
        for(i=0; i<100000 ;i++);
        PLAVE_LED=LEDS;
   }
}
//******************************************* DRUGI NACIN
#include<REGX52.H>
typedef unsigned char byte;
byte xdata led_prek _at_ 0x8000;
byte xdata plave_led _at_ 0x8003;
byte leds;
byte prek;
byte smer;
unsigned int brojac=0;

void poc_stanje(byte x)
{
    switch(x&0x03)
    {
        case 0:
            leds=~0x01;
            break;
        case 1:
            leds=~0x03;
            break;
        case 2:
            leds=~0x07;
            break;
        case 3:
            leds=~0x0f;
            break;
    }
}
void timer2_ISR() interrupt 5
{   EA=0;
    if(++brojac>10000)
    {
        prek=led_prek;
        smer=(0x04&prek)>>2;
        if(smer==0x01)
            leds=(leds>>1)|((leds&0x01)<<7);
        else
            leds=(leds<<1)|((leds&0x80)>>7);
        plave_led=leds;
        brojac=0;
    }
    TF2=EXF2=0;
    EA=1;
}
void main()
{
    RCAP2H=0xfa;
    RCAP2L=0x00;
    T2CON=0x00;
    ET2=1;
    TR2=1;

    EA=1;
    prek=led_prek;
    poc_stanje(prek);

    while(1);
}