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E đã viết nhiều chương trình cho con 8051 sử dụng ngắt ngoài, nhưng vẫn chưa hiểu khi có ngắt ngoài xảy ra >> VĐK nó thực hiện xong chương trình con phục vụ ngắt thì nó sẽ chạy từ chỗ nào trong chương trình chính?
Chẳng hạn chương trình này:
Khi có ngắt ngoài thì biến n tăng lên 1, nhưng chương trình chính vẫn chạy như không có gì thay đổi??
Bác nào đã gặp phải vấn đề này rồi thì giúp e với!
Chẳng hạn chương trình này:
Code:
#include<stdio.h>
#include<reg52.h>
// Chuong trinh 10leds quay trong khong gian hien thi dong chu DHCNHN
unsigned char code START[]={0x33,0xCC,0x33,0xCC};
unsigned char code DHCN1[140]={ //Port 0
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF, //space
0xEF,0,0,0xEE,0xFE,0xFD,1,3,0xFF, //D
0,0,0xEF,0xEF,0xEF,0,0,0xFF,0xFF, //H
3,1,0xFE,0xFE,0xFE,0xFD,0xFF, //C
3,1,0xFE,0xFE,0xFE,1,3,0xFF, //O
0,0,0xF9,0xF3,0xE7,0,0,0xFF, //N
3,1,0xFE,0xFE,0xDE,0x1D,0x1F,0xFF,0xFF, //G
0,0,0xF9,0xF3,0xE7,0,0,0xFF, //N
3,1,0xFE,0xFE,0xDE,0x1D,0x1F,0xFF, //G
0,0,0xEF,0xEF,0xEF,0,0,0xFF, //H
0,0,0xFF, //I
0,0,0xEE,0xEE,0xEE,0xEE,0xFF, //E
0,0,0xDE,0xDE,0xDE,0xE1,0xE3,0xFF,0xFF, //P
0,0,0xEF,0xEF,0xEF,0,0,0xFF, //H
3,1,0xEE,0xEE,0xEE,1,3,0xFF,0xFF, //A
0,0,0xF9,0xF3,0xE7,0,0,0xFF, //N
3,1,0xFE,0xFE,0xFE,1,3,0xFF, //O
0,0, //I
0xFF,0xFF
};
unsigned char code DHCN2[140]={ //Port 2
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF, //space
0xFF,0xFC,0xFC,0xFD,0xFD,0xFE,0xFE,0xFF,0xFF, //D
0xFC,0xFC,0xFF,0xFF,0xFF,0xFC,0xFC,0xFF,0xFF, //H
0xFF,0xFE,0xFD,0xFD,0xFD,0xFE,0xFF, //C
0xFF,0xFE,0xFD,0xFD,0xFD,0xFE,0xFF,0xFF, //O
0xFC,0xFC,0xFF,0xFF,0xFF,0xFC,0xFC,0xFF, //N
0xFF,0xFE,0xFD,0xFD,0xFD,0xFE,0xFE,0xFF,0xFF, //G
0xFC,0xFC,0xFF,0xFF,0xFF,0xFC,0xFC,0xFF, //N
0xFF,0xFE,0xFD,0xFD,0xFD,0xFE,0xFE,0xFF, //G
0xFC,0xFC,0xFF,0xFF,0xFF,0xFC,0xFC,0xFF, //H
0xFC,0xFC,0xFF, //I
0xFC,0xFC,0xFD,0xFD,0xFD,0xFD,0xFF, //E
0xFC,0xFC,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF, //P
0xFC,0xFC,0xFF,0xFF,0xFF,0xFC,0xFC,0xFF, //H
0xFC,0xFC,0xFF,0xFF,0xFF,0xFC,0xFC,0xFF,0xFF, //A
0xFC,0xFC,0xFF,0xFF,0xFF,0xFC,0xFC,0xFF, //N
0xFF,0xFE,0xFD,0xFD,0xFD,0xFE,0xFF,0xFF, //O
0xFC,0xFC, //I
0xFF,0xFF
};
unsigned long int i,k,n,m;
void delay (long int t)
{
unsigned long int j;
for(j=0;j<=t;j++);
}
void main(void)
{
IE=0x81; //Cho phep ngat ngoai 0
while(n<10) //kiem tra so vong quay motor nho hon 10
//muc dich de buc anh duoc quet 10 lan
for(k=0;k<=100;k++)
for(i=0;i<=1;i++)
{
P0= START[i];
P2= START[i+2];
delay(10000);
}
while(n>=10) //lon hon 10 thi hien thi dong chu DHCNHN
for(i=0;i<=139;i++)
{
P0=DHCN1[i];
P2=DHCN2[i];
delay(10000);
}
}
void ngat0(void) interrupt 0 //ngat ngoai 0 dem so vong quay motor
{
n++;
}
Bác nào đã gặp phải vấn đề này rồi thì giúp e với!
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