求指点，16F690

按K，A亮，再按K，B亮，A灭，下面程序不工作，能编译，求指点？谢谢

void main()
{
  int i=0;
  TRISA=0x04;
  TRISC=0x00;
  //PORTC=0x01;//RC0输出高电平
   //PORTC=0x00;
  TRISB=0x00;
  PORTB=0xF0;//RB4-RB7输出高电平
  ANSEL=0x00;
  ANSELH=0x00;
       while(1)
       {
         if(RA2==0)
           { 
              //Delay(5);
              //if(RA2==0)
              i++;
              if(i==1)
                {
                 RC0=1;
                 RC1=0;
                 Delay(500);
                }
              if(i==2)
                {
                 RC1=1;
                 RC0=0;
                 Delay(500);
                 i=0;
                }
           }
       }
 
}