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主要学习键盘输入和查找
/*读取键盘值(先读行,后读列,两两相加,再来个switch判断,函数返回值0-15)
--> 若有键按下 P2显示0-f -->判断是否松开按键,没松开等待,松开返回程序
起始位置
*/
单片机源程序如下:
#include <reg51.h>
#include "delay.h"
#define unit unsigned int
#define uchar unsigned char
int reg_num[]={30,32,34,36,38,40,42,44,46,48,
50,52,54,56,58,60,62,64,66,68,
70,72,74,76,78,80,82,84,86,88,00};
sbit bell= P3^7;
int key,key1,key_start,key_find,shi,ge,shi_enable,ge_enable,res_num=0;
uchar i,j,led_num=0xff;
int timer_i=0,timer_sec=0,timer_enable=0;
int low_power_i=0,low_power_num=0;
uchar keycl()//读取键盘的函数(注:子函数最好放在main前,这样就不用申明)
{
uchar a,b;
P1=0x0f;
i=P1;//读取P1低4位,放在i
P1=0xf0;
j=P1;//不用说也知道吧
a=i+j;//行+列
switch(a)//16种情况
{
case 0x7e:b=0;break;
case 0xbe:b=1;break;
case 0xde:b=2;break;
case 0xee:b=3;break;
case 0x7d:b=4;break;
case 0xbd:b=5;break;
case 0xdd:b=6;break;
case 0xed:b=7;break;
case 0x7b:b=8;break;
case 0xbb:b=9;break;
case 0xdb:b=10;break;
case 0xeb:b=11;break;
case 0x77:b=12;break;
case 0xb7:b=13;break;
case 0xd7:b=14;break;
case 0xe7:b=15;break;
default:b=0xff ;break;
}
return(b);//函数返回值
}
void Timer1Init()
{
TMOD|=0X10;//选择为定时器1模式,工作方式1,仅用TR1打开启动。
TH1=0XFC; //给定时器赋初值,定时1ms
TL1=0X18;
ET1=1;//打开定时器1中断允许
EA=1;//打开总中断
TR1=1;//打开定时器
}
void main()
{
key_start=0;
key_find=0;
shi_enable=0;
ge_enable=0;
P2=0x00;//数码管啥都不显示
Timer1Init();
while(1)
{
key=keycl();//读键盘值,key=函数返回值
if(key!=0xff)//有键按下么?
{
delay(5);
if(key!=0xff)//真的有么?有的 就继续往下走
{
while(P1!=0xf0);//你松开了按键么?没就在这等着
do{delay(5);}
while(P1!=0xf0);//你真的松开了么?假的就等着
low_power_num=0;
key1=key;
if(shi_enable==2)
{
ge=key;
shi_enable=0;
key_start=2;
}
if(key_start==1)
{
if(shi_enable==1)
{
shi=key;
shi_enable++;
}
}
}
}
if(key1==0x0c) //按下开始按键
{
key_start=1;
shi_enable=1;
}
if(key_start==2) //数据输入完成
{
if(key1==0x0d) //按下查找按键
{
res_num=shi*10+ge;
for(i=0;i<=30;i++)
{
if(res_num==reg_num[ i]) //若有
{led_num=i;timer_enable=1;key_start=0;break;}
if(i==31) //若没有
{ bell=0; }
}
}
}
if(timer_enable==0&&low_power_num>=10)
{
PCON|=0x02;
}
}
}
void Timer1() interrupt 3
{
TH1=0XFC; //给定时器赋初值,定时1ms
TL1=0X18;
low_power_i++;
if(low_power_i>=1000)
{
low_power_i=0;
low_power_num++;
}
if(timer_enable==0)
{
P0=0x00;
P2=0x00;
}
if(timer_enable==1)
{
timer_i++;
if(led_num==0||led_num==1)
{
P0=0x01;
}
if(led_num==2||led_num==3)
{
P0=0x02;
}
if(led_num==4||led_num==5)
{
P0=0x04;
}
if(led_num==6||led_num==7)
{
P0=0x08;
}
if(led_num==8||led_num==9)
{
P0=0x10;
}
if(led_num==10||led_num==11)
{
P0=0x20;
}
if(led_num==12||led_num==13)
{
P0=0x40;
}
if(led_num==14||led_num==15)
{
P0=0x80;
}
if(led_num==16||led_num==17)
{
P2=0x01;
}
if(led_num==18||led_num==19)
{
P2=0x02;
}
if(led_num==20||led_num==21)
{
P2=0x04;
}
if(led_num==22||led_num==23)
{
P2=0x08;
}
if(led_num==24||led_num==25)
{
P2=0x10;
}
if(led_num==26||led_num==27)
{
P2=0x20;
}
if(led_num==28||led_num==29)
{
P2=0x40;
}
if(timer_i>=1000)
{timer_i=0;
timer_sec++;
if(timer_sec>=5)
timer_enable=0;
}
}
}
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