#include<reg52.h>
#define uchar unsigned char
#define uint unsigned int
sbit KEY_S1=P2^4;
sbit KEY_S2=P2^5;
sbit KEY_S3=P2^6;
sbit KEY_S4=P2^7;
//==============
void delay(uint k)
{
uint i,j;
for(i=0;i<k;i++){
for(j=0;j<121;j++)
{;}}
}
//=================
void main(void)
{
delay(50);
while(1)
{
if(!KEY_S1){P1=0xfc;}
else if(!KEY_S2){P1=0xf3;}
else if(!KEY_S3){P1=0xcf;}
else if(!KEY_S4){P1=0x3f;}
else {P1=0xff;}
delay(5);
}
} |
