Need help on DS1302 RTC Programming

[hainguyen]

Hi all,
I want to make a digital clock, include PIC16F88, LCD 16x2 and RTC DS1302.
I use CCS C complier, and driver for DS1302 is DS1302.C in C:\Program Files\PICC\Drivers. Here is the code:

void rtc_display()
{

   // Hien thi gio
   if (hour<10)
      {
         lcd_gotoxy(1,1);lcd_putc("0");
         lcd_gotoxy(2,1);printf(lcd_putc,"%u",hour);
      }
      else
      {
         lcd_gotoxy(1,1);printf(lcd_putc,"%u",hour);
      }
      
   // Hien thi phut
   if (min<10)
      {
         lcd_gotoxy(4,1);lcd_putc("0");
         lcd_gotoxy(5,1);printf(lcd_putc,"%u",min);
      }
      else
      {
         lcd_gotoxy(4,1);printf(lcd_putc,"%u",min);
      }
   // Hien thi giay
   if (sec<10)
      {
         lcd_gotoxy(7,1);lcd_putc("0");
         lcd_gotoxy(8,1);printf(lcd_putc,"%u",sec);
      }
      else
      {
         lcd_gotoxy(7,1);printf(lcd_putc,"%u",sec);
      }
}

void main()
{
rtc_init();
lcd_init();
   while(1)
   {
      rtc_get_date(day,mth,year,dow);
      rtc_get_time(hour,min,sec );
      rtc_display();
      delay_ms(500);
   }
}

Time and date have set already, but the the clock didn't work. Where is the problem in my program? Tks for your help.