#include<reg51.h>
typedef unsigned char uint8;
typedef unsigned int uint16;
sbit a=P2^2;
sbit b=P2^3;
sbit c=P2^4;
uint8 smg[]={0x3F, 0x06, 0x5B, 0x4F, 0x66, 0x6D, 0x7D, 0x07,
0x7F, 0x6F, 0x77, 0x7C, 0x39, 0x5E, 0x79, 0x71};
uint8 sum[8];
uint8 m,button;
void delay(uint16 i) //10ms
{
uint8 j,k;
for(;i>0;i--)
for(j=38;j>0;j--)
for(k=130;k>0;k--);
}
void delay1(uint8 i) //1.3ms
{
uint8 j,k;
for(;i>0;i--)
for(j=10;j>0;j--)
for(k=130;k>0;k--);
}
void keyscan()
{
uint8 value,h,l;
P1=0x0f;
l=P1&0x0f;
if(l!=0x0f)
{
delay(1);
if(l!=0x0f)
{
l=P1&0x0f;
l=l|0xf0;
P1=l;
h=P1&0xf0;
l=l&0x0f;
value=h+l;
button=1; //有按鍵按下
delay(50); //如果不加這條語句的話，其按鍵按下一下會顯示多個相同數字
switch(value)
{
case 0xe7: m=0;break;
case 0xeb: m=1;break;
case 0xed: m=2;break;
case 0xee: m=3;break;
case 0xd7: m=4;break;
case 0xdb: m=5;break;
case 0xdd: m=6;break;
case 0xde: m=7;break;
case 0xb7: m=8;break;
case 0xbd: m=9;break;
default : m 0xff break;
}
}
}
}
void display() //按鍵使數字向左移動
{
uint8 i;
for(i=0;i<8;i++)
{
switch(i)
{
case 0: a=1,b=1,c=1;break;
case 1: a=0,b=1,c=1;break;
case 2: a=1,b=0,c=1;break;
case 3: a=0,b=0,c=1;break;
case 4: a=1,b=1,c=0;break;
case 5: a=0,b=1,c=0;break;
case 6: a=1,b=0,c=0;break;
case 7: a=0,b=0,c=0;break;
}
P0=sum[i];;
delay1(1);
P0=0x00;
}
}
/*
void display() //按鍵使數字向右移動
{
uint8 i;
for(i=0;i<8;i++)
{
switch(i)
{
case 0: a=0,b=0,c=0;break;
case 1: a=1,b=0,c=0;break;
case 2: a=0,b=1,c=0;break;
case 3: a=1,b=1,c=0;break;
case 4: a=0,b=0,c=1;break;
case 5: a=1,b=0,c=1;break;
case 6: a=0,b=1,c=1;break;
case 7: a=1,b=1,c=1;break;
}
P0=sum[i];;
delay1(1);
P0=0x00;
}
}
*/
void main()
{
button=0;
while(1)
{
keyscan();
if(button==1)
{
sum[7]=sum[6];
sum[6]=sum[5];
sum[5]=sum[4];
sum[4]=sum[3];
sum[3]=sum[2];
sum[2]=sum[1];
sum[1]=sum[0];
sum[0]=smg[m];
button=0;
}
display();
}
}
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