Mạch đèn điều khiển tín hiệu giao thông!

[demon52]

Em làm đề tài điều khiển tín hiệu giao thông hiển thị số trên led 7 đoạn và đồng hồ thời gian thực trên LCD nhưng đến giai đoạn điều chỉnh số giây đèn xanh đèn đỏ thì ko làm đc ( Ai xem dùm em hàm quét bàn phím của em sai j mà sao lúc ấn nút nó ko tác dụng j cả (
Mọi người xem dùm hàm void change(); của em với nhé!
//================================================== ==

#include <16f877a.h>
#include <def_877a.h>
#device *=16 ADC=8
//#FUSES NOWDT, HS, NOPUT, NOPROTECT, NODEBUG, NOBROWNOUT, NOLVP, NOCPD, NOWRT
#use delay(clock=20000000)
#include "ds1307.c"
#include <lcd_lib_4bit.c>
#define SET PIN_E0
#define TANG PIN_E1
#define GIAM PIN_E2
#define START PIN_D0
void realtime();
void led7seg_do();
void led7seg_xanh();
Void Change(); 
int8 second;
int16 temp1,temp2,temp3,temp4;
//============================================================================
void main()
   {
   TRISA=0x00;
   TRISB=0x00;
   TRISC=0x00;
   TANG==GIAM==SET==START==1;
   //================Hien Thi Ban Dau=====
   init_ds1307();
   lcd_init();
   Printf(LCD_putchar,"Bai Tap Lon VXL");
   LCD_putcmd(0xC4);
   Printf(LCD_putchar,"Nhom ITALY");
   delay_ms(300);
   //======================================
   change();
   led7seg_do();
   realtime();
      
   }
//============================================================================
void led7seg_do()
{   
   int i;              // Khai Bao Bien Kieu int
   while(1)
   {
      if (temp2==0x00&&temp1==0x00) //Neu Dem Nguoc Ve 00 Thoat khoi ham while
      break;
      for(i=0;i<50;i++)              
      {
         PORTB=0x05;      // Hien Thi Chu So Hang Chuc
         PORTA=temp1;
         delay_us(190);
         PORTB=0x00;
         PORTA=0xFF;
         delay_us(10);
         //=======================================
         PORTB=0x0A;    // Hien Thi Chu So Hang DonVi
         PORTA=temp2;
         delay_us(190);
         PORTB=0x00;
         PORTA=0xFF;
         delay_us(10);
      }
      //====================================
      PORTB=0x00;                 // Tao Khoang Trong Giua 2 Lan Dem
      PORTA=0xFF;
      delay_ms(20);
      if (temp2==0x00)
         {
         temp1--;
         temp2=0x09;
         }
      else temp2--;
   }
   break;
}
//=============================================================================
void led7seg_xanh()
{   
   int i;              // Khai Bao Bien Kieu int
   while(1)
   {
      if (temp3==0x00&&temp4==0x00) //Neu Dem Nguoc Ve 00 Thoat khoi ham while
      break;
      for(i=0;i<50;i++)              
      {
         PORTB=0x05;      // Hien Thi Chu So Hang Chuc
         PORTA=temp3;
         delay_us(190);
         PORTB=0x00;
         PORTA=0xFF;
         delay_us(10);
         //=======================================
         PORTB=0x0A;    // Hien Thi Chu So Hang DonVi
         PORTA=temp4;
         delay_us(190);
         PORTB=0x00;
         PORTA=0xFF;
         delay_us(10);
      }
      //====================================
      PORTB=0x00;                 // Tao Khoang Trong Giua 2 Lan Dem
      PORTA=0xFF;
      delay_ms(20);
      if (temp4==0x00)
         {
         temp3--;
         temp3=0x09;
         }
      else temp4--;
   }
   break;
}
//=============================================================================
Void Change()
   {
   LCD_putcmd(0x01);
   Printf(LCD_putchar,"Nhap Thoi Gian!");
   delay_ms(100);
   LCD_putcmd(0xC3);
   Printf(LCD_putchar,"__Den Do__");
   delay_ms(10);
   temp1=0x01;
   temp2=0x09;
   while(1)
      {
      if (START==0) {delay_us(10);break;}
      
      if (TANG==0)
         {
         delay_us(10);
         if (temp1==temp2==0x99) {temp1=temp2=0x00;break;}
         if (temp2==0x09)        {temp1++;temp2=0x00;}
         //=========
         temp2++;
         PORTA=temp1;
         PORTB=0x01;
         delay_ms(10);
         PORTA=0xFF;
         PORTB=0x00;
         delay_us(10);
         //===============     
         PORTA=temp2;
         PORTB=0x02;
         delay_ms(10);
         PORTA=0xFF;
         PORTB=0x00;
         delay_us(10);
         }
      if (GIAM==0)
         {
         delay_us(10);
         if(temp1==temp2==0x00)  {temp1=temp2=0x99;break;}
         if(temp2==0x00)         {temp1--;temp2=0x09;}
         //==========
         temp2--;
         PORTA=temp1;
         PORTB=0x01;
         delay_ms(10);
         PORTA=0xFF;
         PORTB=0x00;
         delay_us(10);
         //===================     
         PORTA=temp2;
         PORTB=0x02;
         delay_ms(10);
         PORTA=0xFF;
         PORTB=0x00;
         delay_us(10);
         }
         //=============================
         PORTA=temp1;
         PORTB=0x01;
         delay_ms(10);
         PORTA=0xFF;
         PORTB=0x00;
         delay_us(10);
         PORTA=temp2;
         PORTB=0x02;
         delay_ms(10);
         PORTA=0xFF;
         PORTB=0x00;
         delay_us(10);
      }
   }
//==============================================================================   
void realtime()
   {
   second=read_ds1307(0);
   write_ds1307(0,second&0x7F);
   write_ds1307(7,0x10);
   while(1)
   {
      if (SET==0){delay_ms(10);change();}
      
      else
      delay_ms(500);
      LCD_putcmd(0x01);//========Dua con tro ve dau dong 1======
      Printf(LCD_putchar,"Time:");
      second=read_ds1307(2);
      LCD_putchar(second/16 + 0x30);
      LCD_putchar(second%16 + 0x30);
      Printf(LCD_putchar,"-");
      second=read_ds1307(1);
      LCD_putchar(second/16 + 0x30);
      LCD_putchar(second%16 + 0x30);
      Printf(LCD_putchar,"-");
      second=read_ds1307(0);
      LCD_putchar(second/16 + 0x30);
      LCD_putchar(second%16 + 0x30);
      
      
      LCD_putcmd(0xC0); //===Dua Con Tro xuong dau dong 2========
      Printf(LCD_putchar,"Date:");
      second=read_ds1307(4);
      LCD_putchar(second/16 + 0x30);
      LCD_putchar(second%16 + 0x30);
      Printf(LCD_putchar,"-");
      second=read_ds1307(5);
      LCD_putchar(second/16 + 0x30);
      LCD_putchar(second%16 + 0x30);
      Printf(LCD_putchar,"-");
      second=read_ds1307(6);
      LCD_putchar(second/16 + 0x30);
      LCD_putchar(second%16 + 0x30);
      }
   }