嵌入式试验三

#include<reg51.h>


unsigned char code LED7Code[] = {0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x67};

unsigned char num;

void display(void);

void delay(void){
    unsigned char i;
    for(i=0;i<250;i++){

    }

}


main(){

    EA=1;
    EX0=1;
    EX1=1;
    IT0=1;     //采用边沿触发，下降沿触发
    IT1=1;

    while(1){
        display();
    }
}

void display(void){

    char label_4,label_3,label_2,label_1;
    unsigned char i;
    for(i=0;i<0xFF;i++){

        label_4=num/1000;
        label_3=(num-label_4*1000)/100;
        label_2=(num-label_4*1000-label_3*100)/10;
        label_1=num%10;

        P2 = 0xFF;
        P0 = LED7Code[label_4];
        P20 = 0;
        delay();

        P2 = 0xFF;
        P0 = LED7Code[label_3];
        P21 = 0;
        delay();

        P2 = 0xFF;
        P0 = LED7Code[label_2];
        P22 = 0;
        delay();

        P2 = 0xFF;
        P0 = LED7Code[label_1];
        P23 = 0;
        delay();
    }
}

void int_0(void) interrupt 0 using 0{
    num++;
}

void int_1(void) interrupt 2 using 1{
    num--;
}