hi every one..
i'm facing some problem in my projects. i worked it on proteus and i have attached some snaps shot of my project. i'm reading analog i/p from RA2 and display it on 4 7-segments devices. i used 74ls78 bcd to 7 segment decoder and 74ls138 decoder. i've copied my source code too with this. the fig1 shows the intial setup and fig2 shows the during execution of the project. i think the problem with the code it self.. when i simulate in proteus only one device is active and its always shows zero (0) irrespective of analog input. i want to display the result on 7 segment so please go through the code and let me know if is there any changes have to make in this.
code:

#include<16f877.h>
unsigned int cnt, brk;
char led [3];
unsigned int rem;
void converter (unsigned int z);
void scanled (void);
void main() 
{
 OPTION_REG=0x80;
 PORTA=0;
 TRISA=255;
 PORTD=0;
 TRISD=0;
 while(1)
 {
  cnt=ADC_Read(2);
  cnt=cnt*5;
  converter (cnt);
  scanled ();
  }
}
void converter(unsigned int z)
     {
      led[0]=z/1000;
      rem=z%1000;
      led[1]=rem/100;
      rem=rem%100;
      led[2]=rem/10;
      led[3]=rem%10;
      }
void scanled (void)
     {
     unsigned char i;
     for (i=0;i<4;i++)
         {
         portd=i;portd=led;delay_ms(10);
         }
     }

 

could it be your portd assignment? should it be something like this instead?

    portd = led + (i<<4); delay_ms(10);