单片机Day11

#include <REGX51.H>

typedef unsigned int u16;

typedef unsigned char u8;

u8 i=0;

void delay_10us(u16 t)

{

while(t--);

}

void main()

{

P2=~0x01;

while(1)

{

if(P3_1==0)

{

delay_10us(50000);

while(P3_1==0)

delay_10us(50000);

i++;

if(i>=8)

i=0;

P2=~(0x01<<i);

}

if(P3_0==0)

{

delay_10us(50000);

while(P3_1==0)

delay_10us(50000);

if(i==0)

i=7;

else

i--;

P2=~(0x01<<i);

}

}

}