script1.c

P1口基本实验 P1口做输出口

#include<reg52.h>
unsigned char L;
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(){
    unsigned char k;
    L=0xFF;
    display();
    delay(100);
    L=0x00;
    display();
    delay(100);
    while(1){
        L=0x01;
        display();
        delay(100);
        for(k=0;k<8;k++){
            L=L<<1;
            display();
            delay(100);
        }
        L=0x80;
        display();
        delay(100);
        for(k=0;k<8;k++){
            L=L>>1;
            display();
            delay(100);
        }
    }
}