7-segment LED interface

Display the Hex digits 0 to F on a 7-segment LED interface

Theory:

DISPLAY ARE CONNECTED IN COMMON CATHODE MODE

Port0 Connected to data lines of all 7 segement displays

              a

            ----

          f|  g |b

           |----|

          e|    |c

            ----  . dot

             d 

          a = P0.04                                        

          b = P0.05

          c = P0.06

          d = P0.07

          e = P0.08

          f = P0.09

          g = P0.10

          dot = P0.11

                 

          Select lines for two 7 Segments

          DIS1 P0.19

          DIS2 P0.20

Program:

#include <LPC17xx.h>

unsigned int delay, count=0, Switchcount=0,j;

unsigned int Disp[16]={0x000003f0, 0x00000060, 0x000005b0, 0x000004f0, 0x00000660,0x000006d0, 0x000007d0, 0x00000070, 0x000007f0, 0x000006f0, 0x00000770,0x000007c0,0x00000390, 0x000005e0, 0x00000790, 0x00000710 };

#define ALLDISP  0x00180000   //Select two 7 segments display

#define DATAPORT 0x00000ff0   //P0.16 to P0.23 : Data lines connected to drive Seven Segments

int main (void)

{

          LPC_PINCON->PINSEL0 = 0x00000000;  

          LPC_PINCON->PINSEL1 = 0x00000000;

          LPC_GPIO0->FIODIR =     0x00180ff0;

         

while(1)

{

     LPC_GPIO0->FIOSET |= ALLDISP;

     LPC_GPIO0->FIOCLR =    0x00000ff0;   // clear the data lines to 7-segment displays

     LPC_GPIO0->FIOSET = Disp[Switchcount]; // get the 7-segment display value from the array

      for(j=0;j<3;j++)

      for(delay=0;delay<30000;delay++);      // 1s delay  

       Switchcount++;

 if(Switchcount == 0x10)      // 0 to F has been displayed ? go back to 0

   {

             Switchcount = 0;

             LPC_GPIO0->FIOCLR  = 0x00180ff0;                                   

     }

         

     }

}