A 7-segment display is just a set of seven LED bars contained in a convenient pa

Question

A 7-segment display is just a set of seven LED bars contained in a convenient package, as shown below. They are generally provided in two different packages: common cathode (CC) and common anode (CA). The common-cathode package ties both the COM terminals together, which then needs to be connected to GND; each LED segment can be illuminated by applying positive voltage to the individual anodes (i.e. write a '1' to a port pin connected to that LED segment. The common-anode package ties both the COM terminals together, which then needs to be connected to Vcc; each LED segment can be illuminated by applying GND to the individual cathodes (i.e. write a '0' to a port pin connected to that LED segment. Your task is to write a complete C program that will continuously display numbers 0 to 9 on the 7-segment LED with a delay of 1 second between each display. You will use the following pin configurations: You should be able to find the 7-segment from your EGR106 toolkit. Make sure your program works on the hardware.

Explanation / Answer

#include"REGx52.h"
#define seg_data P2
intnum=0;
void display_digit(int);
void delay(int);

void main()
{
   while(1)
   {
     for(num=0;num<10 br="" num="">     {
       display_digit(num);
       delay(20000);
      }
   }
}
void delay(int x)
{
int i;
for(i=0;i}
voiddisplay_digit(int digit)
{
switch(digit)
{
   case 0:
   seg_data=0x3f;
   break;

   case 1:
   seg_data=0x06;
   break;

   case 2:
   seg_data=0x5b;
   break;

   case 3:
   seg_data=0x4f;
   break;

   case 4:
   seg_data=0x66;
   break;

   case 5:
   seg_data=0x6d;
   break;

   case 6:
   seg_data=0x7d;
   break;

   case 7:
   seg_data=0x07;
   break;

   case 8:
   seg_data=0x7f;
   break;

   case 9:
   seg_data=0x6f;
   break;
}
}

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