#include <reg51.h>
#include<math.h>
#include <stdio.h>
#include<stdlib.h>
sbit SA=P0^0;
sbit SB=P0^1;
sbit SC=P0^2;
sbit E3=P0^3;
sbit P1_4=P1^4;
sbit P1_5=P1^5;
sbit P1_6=P1^6;
sbit P1_7=P1^7;
char code table[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};// 0,1,2,3,4,5,6,7,8,9
unsigned char key,temp,ch[6];
void time_init(void)//定时器0初始化
{
TMOD=0x09;
//TH0=0xf4;TL0=0xc0;//定时3.125ms
//TR0=1;
ET0=1;
EX0=1;
IT0=0;
EA=1;
}
void display(unsigned char k) //显示程序
{
P2=table[k];
}
void delay(char x)//延时函数
{
char i;
while(x--)
for(i=0;i<125;i++)
continue;
}
void check(void)//判断键盘松开
{
while(temp!=0x0f)
{
temp=P1;
temp=temp & 0x0f;
}
}
/*void check_down(void)//判断键盘按下
{
while(temp==0x0f)
{
temp=P1;
temp=temp & 0x0f;
}
}*/
unsigned char keyscan(void) //按键扫描子程序
{
//P1=0x00;
P1_7=0;
temp=P1;
temp&=0x0f;
//check_down();
if(temp !=0x0f)
{
delay(9);
temp=P1;
temp&=0x0f;
if(temp !=0x0f)
{
temp=P1;
temp&=0x0f;
switch(temp)
{
case 0x0d:key=55;break;
case 0x0b:key=22;break;
case 0x07:key=11;break;
}
display(key);
// check();
}
}
P1=0xFF;
P1_6=0;
temp=P1;
temp&=0x0f;
if(temp !=0x0f)
{
temp=P1;
delay(9);
temp&=0x0f;
if(temp !=0x0f)
{
temp=P1;
temp&=0x0f;
switch(temp)
{
case 0x0e:key=33;break;
case 0x0d:key=3;break;
case 0x0b:key=2;break;
case 0x07:key=1;break;
}
display(key);
// check();
}
}
P1=0xFF;
P1_5=0;
temp=P1;
temp&=0x0f;
if(temp !=0x0f)
{
temp=P1;
delay(9);
temp&=0x0f;
if(temp !=0x0f)
{
temp=P1;
temp&=0x0f;
switch(temp)
{
case 0x0e:key=44;break;
case 0x0d:key=6;break;
case 0x0b:key=5;break;
case 0x07:key=4;break;
}
display(key);
//check();
}
}
P1=0xFF;
P1_4=0;
temp=P1;
temp&=0x0f;
if(temp !=0x0f)
{
temp=P1;
delay(9);
temp&=0x0f;
if(temp !=0x0f)
{
temp=P1;
temp&=0x0f;
switch(temp)
{
case 0x0e:key=0;break;
case 0x0d:key=9;break;
case 0x0b:key=8;break;
case 0x07:key=7;break;
}
display(key);
//check();
}}
return(key);
}
void time0() interrupt 0 using 0
{
unsigned char i;
P1=0x00;
for(i=0;i<2;i++)
{
if(i==0)
{
E3=1;SA=0;SB=0;SC=0;
ch[0]=keyscan();
delay(3);
}
if(i==1)
{
E3=1;SA=1;SB=0;SC=0;
ch[1]=keyscan();
delay(3);
}
}
/*if(1)
{
E3=1;SA=0;SB=0;SC=0;
keyscan();
delay(1);
}
if(1)
{
E3=1;SA=1;SB=0;SC=0;
//P2=table[3];
keyscan();
delay(1);
}*/
}
void main(void)
{
unsigned char i;
SP=0x50;
EA=0;
time_init();
for(i=0;i<2;i++)
{
P0=1;
E3=1;
display(ch);
delay(1);
}
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