p1exe.c

P1口扩展实验 P1口既做输入口又做输出口

#include<reg51.h>
unsigned char L;
sbit P10=P1^0;
sbit P11=P1^1;
void delay(unsigned int ms){
    unsigned char i;
    unsigned int j;
    for(j=0;j<ms;j++){
        for(i=0;i<60;i++){
            ;
        }
    }
}
void display(){
    P1=~L;
}

main(){
	while(1){	
		if((P10==1)&&(P11==1)){
			L=0xFC;
			display();
		}else if(P10==0&&P11==0){
			L=0x00;
			display();
		}else if(P10==1&&P11==0){
			L=0xB0;
			display();
			delay(500);
			L=0x00;
			display();
			delay(500);
		}else if(P10==0&&P11==1){
			L=0x4C;
			display();
			delay(500);
			L=0x00;
			display();
			delay(500);
		}
	}	
}