#include<reg52.h>
#define uchar unsigned char
#define uint unsigned int
uchar data dir_buf; //顯示緩沖區
uchar key; //計算所得到的鍵值
uchar i2; //鍵號
//code uchar dirtab[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0x88,0x83,0xc6,0xa1,0x86,0x8e};//顯示代碼表
code uchar dirtab[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};
code uchar keytab[]={0xee,0xed,0xeb,0xe7,0xde,0xdd,0xdb,0xd7,0xbe,0xbd,0xbb,0xb7,0x7e,0x7d,0x7b,0x77};//顯示鍵值表
void delay(uint); //延時函數
void display(); //顯示函數
void keyscan(); //鍵盤掃描函數
void main()
{
//i2=16;
//dir_buf=16;
while(1)
{
keyscan();
dir_buf=i2;
display();
}
}
void delay(uint x)
{
uint t1,t2;
for(t1=0;t1<x;t1++)
for(t2=0;t2<120;t2++);
}
void display()
{
if(i2>9)
{
P0=dirtab[1];
P3=dirtab[dir_buf-10];
}
else
{
P0=dirtab[0];
P3=dirtab[dir_buf];
}
}
void keyscan()
{
uchar code_l,code_h,i1;
P1=0xf0;
code_l=P1;
code_l=code_l&0xf0;
if(code_l!=0xf0)
{
delay(6);
code_l=P1;
code_l=code_l&0xf0;
if(code_l!=0xf0)
{
code_h=0xfe;
for(i1=0;i1<4;i1++)
{
P1=code_h;
code_l=P1;
code_l=code_l&0xf0;
if(code_l==0xf0)
{
code_h=(code_h<<1)|0x01;
}
else break;
}
P1=0xff;
while(P1!=0xff);
code_h=code_h&0x0f;
key=code_h+code_l;
for(i2=0;i2<16;i2++)
{
if(key==keytab[i2])
{
break;
}
}
}
}
}
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