0_99.c

PIC based Counter count from 0 to99

#include<16f877.h>
#fuses XT,NOLVP,NOWDT,PUT
#use delay (clock=4000000)   // defind crystal = 4MHz
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7)
#byte port_d=8
#byte port_a=5
byte CONST LED_MAP[10]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0X80,0x90};
increment_sw();
int n;
//===========================================
// this function use to display number 00=999
// input : n = number to display
//===========================================
void display_number(long int n)
{

   output_d(LED_MAP[n%10]) ;//unit position ;n=0 to 9
   output_low(PIN_A0);
   delay_ms(2);
   output_high(PIN_A0);
/*
   output_d(LED_MAP[n/10%10]) ;//tens position
   output_low(PIN_A1);
   delay_ms(2);
   output_high(PIN_A1);

   output_d(LED_MAP[n/100%10]);//hundards position
   output_low(PIN_A2);
   delay_ms(2);
   output_high(PIN_A2);*/


}
//============================================
// main program
//============================================
void main()
{
long int count=1;
   

if(!input(pin_b0))
{

    count++;
    if(count==10)
    count=0;
    output_d(LED_MAP[n%10]);
    
    increment_sw();

}
   while(TRUE)
   {
   int i;
   
      for (i=0;i<=200;i++)

         display_number(count);      // dispay 200 times
    count=(count==9) ? 1: count+1;  //count+1=++count

   }
}
increment_sw(){
int a;
 for(a=0;a<20;a++){

  for(i=0;i<200;i++)
  {
    delay_us(10);
    
  }
  }
    display_nuber(count);
}