Hỏi về ngắt 16f877a

[ghosthigh]

Em viết chuơng trình đèn giao thông có menu điều khiển sử dụng ngắt rb nhưng khi chạy mô phỏng kô thấy hoạt động,hix, ai giúp em với

//************************************************** ***************************
// Author : ghost
// Project : Traffic lights
// Hardware: PIC16F877A
//************************************************** ***************************
#include <16F877A.h>
#include <def_877a.h>
#fuses NOWDT,PUT,XT,NOPROTECT
#use delay(clock=2000000)
#include <lcd_lib_4bit.h>

int h=12,m=0; //gio,phut
int g1=30,g2=30; //den xanh 1,den xanh 2
int r1=30,r2=30; //den do 1, den do 2 1 ung voi rsh, 2 ung voi nor
int y=5; //den vang
int d1=3,d2=3; //thoi gian tre 1,thoi gian tre 2
int y_b=22; //gio nhay den vang
int change; //bien nhan ngat
int menu,up,down,set; //cac bien nhan biet nut bam
int a=0; //trang thai menu
int a1,a2,a3,a4,a5,a6,a7,a10;
unsigned int a8,a9;

#int_rb
void ngat_rb()
{
if(rbif&&rbie)
{
porta=0;
porte=0;
change=1;
if(rb4)
{
menu=1;
a++;
if(a>10) a=0;
}
if(rb5) up=1;
if(rb6) down=1;
if(rb7) set=1;
}
}
void leddon(int tg,tv,tx,td)
{
int i;
while(true)
{
for(i=0;i<(tv+tx+td);i++)
{
delay_ms(100);
// cac den cho nguoi tham gia giao thong
if(i<tg)
porta=0b00100100; //d1 sang d2 sang
if((i>tg)&&(i<(tg+tx)))
porta=0b00100001; //d1sang x2 sang
if((i>(tg+tx)&&(i<(tg+tx+tv))))
porta=0b00100010; //d1 sang v2 sang
if((i>(tg+tx+tv)) && (i<(tg+tg+tx+tv)))
porta=0b00100100; //d1 sang do2 sang
if((i>(tg+tg+tx+tv)) && (i<(td+tx)))
porta=0b00001100; //x1 sang d2 sang
if((i>(tx+td)) && (i<(td+tx+tv)))
porta=0b00010100; //va1 sang d2 sang
// cac den danh cho nguoi di bo
if(tg>=5)
{
if((i<(tg-5)) || (i>tg+tv+tx+5))
portb=0b00000110;
if(((i>tg-5)&&(i<5)) || ((i>(2*tg+tv+tx-5))&&(i<tg+tv+tx+5)))
portb=0b00001010;
if((i>5) && (i<(2*tg+tv+tx-5)))
portb=0b00001001;
}
if(tg<5)
{
if((i<5) || ((i>(2*tg+tv+tx-5))&& (i<tg+tv+tx+5)) || (i>(td+tx+tv-5+tg)))
portb=0b00001010;
if((i>5) && (i<(2*tg+tv+tx-5)))
portb=0b00001001;
if((i>tg+tv+tx+5)&& (i<(td+tx+tv-5+tg)))
portb=0b00000110;
}
}
}
} // het ham leddon
void main()
{
set_tris_a(0);
set_tris_b(0xF0);
set_tris_c(0);
set_tris_d(0);
set_tris_e(0);
if(((h>=7)&&(h<=9))|((h>=17)&&(h<=19))) //Gio cao diem
leddon(d1,y,g1,r1);
if((h>=y_b)&&(h>=0)&&(h<=5)) //Gio nhay den vang
{
while(true)
{
delay_ms(100);
output_high(pin_a1);
output_high(pin_a4);
}
}
if(((h>=6)&&(h<=7))|((h>=9)&&(h<=17))|((h>=19)&&(h <=y_b))) //Gio binh thuong
leddon(d2,y,g2,r2);
enable_interrupts(global);
enable_interrupts(int_rb);
ext_int_edge(L_to_H);
lcd_init();
printf(lcd_putchar,"ghost");
if(change)
{
change=0;
if((menu==1)&&(a==1))
{
LCD_PutCmd(0x01);
printf(lcd_putchar, "Gio :%d h",h);
a1=h; //bien tam
if(down==1)
{
a1--;
if(a1==0) a1=23;
printf(lcd_putchar, "Gio :%d h",a1);
down=0;
}
if(up==1)
{
a1++;
if(a1==24) a1=0;
printf(lcd_putchar, "Gio :%d h",a1);
up=0;
}
if(set==1)
{
h=a1;
set=0;
}
}
if((menu==1)&&(a==2))
{
LCD_PutCmd(0x01);
printf(lcd_putchar, "Phut :%d m",m);
a2=m; //bien tam
if(down==1)
{
a2--;
if(a2==0) a1=59;
printf(lcd_putchar, "Phut :%d m",a2);
down=0;
}
if(up==1)
{
a2++;
if(a2==60) a2=0;
printf(lcd_putchar, "Phut :%d m",a2);
up=0;
}
if(set==1)
{
m=a2;
set=0;
}
}
if((menu==1)&&(a==3))
{
LCD_PutCmd(0x01);
printf(lcd_putchar, "Den vang :%d s",y);
a3=y; //bien tam
if(down==1)
{
a3--;
if(a3==2) a3=10;
printf(lcd_putchar, "Den vang :%d s",a3);
down=0;
}
if(up==1)
{
a3++;
if(a3==11) a3=3;
printf(lcd_putchar, "Den vang :%d s",a3);
up=0;
}
if(set==1)
y=a3;
set=0;
}
if((menu==1)&&(a==4))
{
LCD_PutCmd(0x01);
printf(lcd_putchar, "Do cao diem :%d s",r1);
a4=r1; //bien tam
if(down==1)
{
a4--;
if(a4==19) a4=90;
printf(lcd_putchar, "Do cao diem :%d s",a4);
down=0;
}
if(up==1)
{
a4++;
if(a4==91) a4=20;
printf(lcd_putchar, "Do cao diem :%d s",a4);
up=0;
}
if(set==1)
{
r1=a4;
set=0;
}
}
if((menu==1)&&(a==5))
{
LCD_PutCmd(0x01);
printf(lcd_putchar, "Do thap diem :%d s",r2);
a5=r2; //bien tam
if(down==1)
{
a5--;
if(a5==19) a5=90;
printf(lcd_putchar, "Do thap diem :%d s",a5);
down=0;
}
if(up==1)
{
a5++;
if(a5==91) a5=20;
printf(lcd_putchar, "Do thap diem :%d s",a5);
up=0;
}
if(set==1)
{
r2=a5;
set=0;
}
}
if((menu==1)&&(a==6))
{
LCD_PutCmd(0x01);
printf(lcd_putchar, "Xanh cao diem :%d s",g1);
a6=g1; //bien tam
if(down==1)
{
a6--;
if(a6==9) a6=70;
printf(lcd_putchar, "Xanh cao diem :%d s",a6);
down=0;
}
if(up==1)
{
a6++;
if(a6==71) a6=10;
printf(lcd_putchar, "Xanh cao diem :%d s",a6);
up=0;
}
if(set==1)
{
g1=a6;
set=0;
}
}
if((menu==1)&&(a==7))
{
LCD_PutCmd(0x01);
printf(lcd_putchar, "Xanh thap diem :%d s",g2);
a7=g2; //bien tam
if(down==1)
{
a7--;
if(a7==9) a7=70;
printf(lcd_putchar, "Xanh thap diem :%d s",a7);
down=0;
}
if(up==1)
{
a7++;
if(a7==71) a7=10;
printf(lcd_putchar, "Xanh thap diem :%d s",a7);
up=0;
}
if(set==1)
{
g2=a7;
set=0;
}
}
if((menu==1)&&(a==8))
{
LCD_PutCmd(0x01);
printf(lcd_putchar, "Do giao cao diem :%d s",d1);
a8=d1; //bien tam
if(down==1)
{
a8--;
if(a8==-1) a8=10;
printf(lcd_putchar, "Do giao cao diem :%d s",a8);
down=0;
}
if(up==1)
{
a8++;
if(a8==11) a8=0;
printf(lcd_putchar, "Do giao cao diem :%d s",a8);
up=0;
}
if(set==1)
{
d1=a8;
set=0;
}
}
if((menu==1)&&(a==9))
{
LCD_PutCmd(0x01);
printf(lcd_putchar, "Do giao thap diem :%d s",d2);
a9=d2; //bien tam
if(down==1)
{
a9=d2;
if(a9==-1) a9=10;
printf(lcd_putchar, "Do giao thap diem :%d s",a9);
down=0;
}
if(up==1)
{
a9++;
if(a9==11) a9=0;
printf(lcd_putchar, "Do giao thap diem :%d s",a9);
up=0;
}
if(set==1)
{
d2=a9;
set=0;
}
}
if((menu==1)&&(a==10))
{
LCD_PutCmd(0x01);
printf(lcd_putchar, "Gio nhay den vang :%d s",y_b);
a10=y_b; //bien tam
if(down==1)
{
a10--;
if(a10==20) a10=23;
printf(lcd_putchar, "Gio nhay den vang :%d s",a10);
down=0;
}
if(up==1)
{
a10++;
if(a10==24) a10=21;
printf(lcd_putchar, "Gio nhay den vang :%d s",a10);
up=0;
}
if(set==1)
{
y_b=a10;
set=0;
}
}
}
}

Đây là mạch mô phỏng ạ
http://www.mediafire.com/?kxy1fuo1nyn