7seg_dec_sw.c.c

Seven segment example

//    7SEG_dec_sw.C
//Example to drive one 7-Segment LED with decriment by one when press switch
/****************************************
*
* COPYRIGHT (c) Blitzlogic Sdn. Bhd.
* Author : Abraham Wong 21/1/2000
*
* example of using FOR loop to drive
* two 7-Segment LEDs

****************************************/

#include <16F877.h>
#USE DELAY( CLOCK=4000000 ) /* Using a 4 Mhz clock */
#FUSES XT,NOWDT,NOPROTECT,NOPUT,NOLVP
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7)
/* Use XT mode, No Watch Dog, No Code Protect, No Power-up Timer */
#byte port_d=8 /* define the location of register port_b */
#byte port_a=5 /* define the location of register port_b */
byte CONST LED_MAP[10] = {0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0X80,0x90};

main(){
byte cnt, right,num ;
port_b_pullups(true);
set_tris_d(0); /* set port_b as outputs */
set_tris_a(0); /* set port_a as output */
  port_d = 0xFF; /* ZERO port_a & port_b */
  port_a = 0xFF;

   while(1){

//for( ;; ){
// for (right=1;right<3;right++){
//   port_a = ~right;
    for (cnt=9;cnt<10;cnt--){
    port_d = LED_MAP[cnt];
    output_low(PIN_A0);
    DELAY_MS(500); /* half second delay */
 //    output_high(PIN_A0);
         while(!input(PIN_B1)==0){
                                 }
                              }

            }
        }