描述
c语言键盘扫描程序
4*4键盘扫描C语言程序
/* 4x4矩阵键盘的扫描程序
测试通过*/
#includesbit P1_0=P1^0;
sbit P1_1=P1^1;
sbit P1_2=P1^2;
sbit P1_3=P1^3;
sbit P2_7=P2^7;
sbit P3_7=P3^7;
unsigned char code table[]={0xC0,0xF9,0xA4,0xB0,0x99, //0~4
0x92,0x82,0xF8,0x80,0x90, //5~9
0x88,0x83,0xC6,0xA1,0x86,0x8E}; //A~F
void KeyScan();
void delay10ms(unsigned char time);
void Dispaly(unsigned char k);
void buzzer();
unsigned char key,temp;
void main() //主程序
{
while(1)
{
KeyScan();
}
}
void KeyScan() //按键扫描子程序
{
P1=0xFF;
P1_0=0;
temp=P1;
temp&=0xF0;
if(temp !=0xF0)
{buzzer();
delay10ms(10);
temp=P1;
temp&=0xF0;
if(temp !=0xF0)
{
temp=P1;
temp&=0xF0;
switch(temp)
{
case 0xE0:
key=0;break;
case 0xD0:
key=4;break;
case 0xB0:
key=8;break;
case 0x70:
key=12;break;
}
Dispaly(key);
}
}
P1=0xFF;
P1_1=0;
temp=P1;
temp&=0xF0;
if(temp !=0xF0)
{buzzer();
delay10ms(10);
temp=P1;
temp&=0xF0;
if(temp !=0xF0)
{
temp=P1;
temp&=0xF0;
switch(temp)
{
case 0xE0:
key=1;break;
case 0xD0:
key=5;break;
case 0xB0:
key=9;break;
case 0x70:
key=13;break;
}
Dispaly(key);
}
}
P1=0xFF;
P1_2=0;
temp=P1;
temp&=0xF0;
if(temp !=0xF0)
{buzzer();
delay10ms(10);
temp=P1;
temp&=0xF0;
if(temp !=0xF0)
{
temp=P1;
temp&=0xF0;
switch(temp)
{
case 0xE0:
key=2;break;
case 0xD0:
key=6;break;
case 0xB0:
key=10;break;
case 0x70:
key=14;break;
}
Dispaly(key);
}
}
P1=0xFF;
P1_3=0;
temp=P1;
temp&=0xF0;
if(temp !=0xF0)
{buzzer();
delay10ms(10);
temp=P1;
temp&=0xF0;
if(temp !=0xF0)
{
temp=P1;
temp&=0xF0;
switch(temp)
{
case 0xE0:
key=3;break;
case 0xD0:
key=7;break;
case 0xB0:
key=11;break;
case 0x70:
key=15;break;
}
Dispaly(key);
}
}
}
//延时程序
void delay10ms(unsigned char time)
{
unsigned char i;
while(time--)
{
for(i=0;i<120;i++) ;
}
}
void Dispaly(unsigned char k) //显示程序
{
P0=table[k];
P2_7=0;
}
void buzzer()
{
P3_7=0;
delay10ms(20);
P3_7=1;
}
6x3扫描键盘驱动程序(C语言编写)
〖说明〗18个按键扫描驱动程序，横向扫描第一行：p0.6第二行：p0.7第三行：p2.6
纵向扫描：第一行：p0.0第二行：p0.1第三行：p0.2第四行：p0.3第五行：
p0.4第六行：p0.5
〖文件〗key.c2002/12/10
〖作者〗鞠春阳
〖信箱〗jcygood@jcygood@
〖版本〗v1.00abuild
--------------------------------------------------------------------------------*/
//＃i nclude"reg51.h"
//＃i nclude"lcd12864.h"
#defineportp0//定义p0口
sbitp2_6=p2^6;//定义p2.6口
unsignedintzdtime=0;
unsignedintpingbaotime=0;
/*定义18个按键的返回值*/
#definerunkey1
#definestopkey2
#defineupkey3
#definedownkey4
#definea_c5
#defined_f6
#defineg_i7
#definej_l8
#definem_o9
#definep_s10
#definet_v11
#definew_z12
#definepageupkey13
#definepagedownkey14
#defineenterkey15
#definebackkey16
#definechineseorenglish17
#definecancelkey18
//按键扫描函数
unsignedchargetkey()
{
unsignedchara,b;
unsignedintdelay=0;//延时变量
port=0xff;//p0口复位
p2_6=1;//p2.6复位
//扫描第三行
p2_6=0;
while(!(port&0x01))
{
if(++delay>0x1ff0){return(pagedownkey);}
}
while(!(port&0x02))
{
if(++delay>0x1ff0){return(chineseorenglish);}
}
while(!(port&0x04))
{
if(++delay>0x1ff0){return(backkey);}
}
while(!(port&0x08))
{
if(++delay>0x1ff0){return(pageupkey);}
}
while(!(port&0x10))
{
if(++delay>0x1ff0){return(cancelkey);}
}
while(!(port&0x20))
{
if(++delay>0x1ff0){return(enterkey);}
}
port=0xff;//p0口复位
p2_6=1;//p2.6复位
//扫描第一行
port=0x7f;
delay=0;
while(!(port&0x01))
{
if(++delay>0x1ff0){return(downkey);}
}
if(delay>0xff0){return(downkey);}
while(!(port&0x02))
{
if(++delay>0x1ff0){return(stopkey);}
}
if(delay>0xff0){return(stopkey);}
while(!(port&0x04))
{
if(++delay>0x5fd0){return(w_z);}
}
if(delay>0xff0){return(w_z);}
while(!(port&0x08))
{
if(++delay>0x5fd0){return(t_v);}
}
if(delay>0xff0){return(t_v);}
while(!(port&0x10))
{
if(++delay>0x5fd0){return(p_s);}
}
if(delay>0xff0){return(p_s);}
while(!(port&0x20))
{
if(++delay>0x5fd0){return(m_o);}
}
if(delay>0xff0){return(m_o);}
port=0xff;//p0口复位
p2_6=1;//p2.6复位
//扫描第二行
port=0xbf;
delay=0;
while(!(port&0x01))
{
if(++delay>0x1ff0){return(upkey);}
}
if(delay>0xff0){return(upkey);}
while(!(port&0x02))
{
if(++delay>0x1ff0){return(runkey);}
}
if(delay>0xff0){return(runkey);}
while(!(port&0x04))
{
if(++delay>0x5fd0){return(j_l);}
}
if(delay>0xff0){return(j_l);}
while(!(port&0x08))
{
if(++delay>0x5fd0){return(g_i);}
}
if(delay>0xff0){return(g_i);}
while(!(port&0x10))
{
if(++delay>0x5fd0){return(d_f);}
}
if(delay>0xff0){return(d_f);}
while(!(port&0x20))
{
if(++delay>0x5fd0){return(a_c);}
}
if(delay>0xff0){return(a_c);}
return(0);
}
3x4矩阵键盘的扫描程序(C语言)
/* 3x4矩阵键盘的扫描程序
按相应的按键，数码管显示相应的数字，星号键和井号键分别显示为E和F
*********************************
Create by:左秀龙
support:
Tel:0755-82879296
email: cutedesign@
Date: /06/23
*********************************
测试通过*/
#include
unsigned char code table[]={0xC0,0xF9,0xA4,0xB0,0x99,//0~4
0x92,0x82,0xF8,0x80,0x90,//5~9
0x88,0x83,0xA7,0xA1,0x86,0x8E};//A~F
void KeyScan();
void delay10ms(unsigned char time);
void Dispaly(unsigned char k);
unsigned char key,temp;
void main()//主程序
{
while(1)
{
KeyScan();
}
}
void KeyScan()//按键扫描子程序
{
P1=0xFF;
P1_3=0;
temp=P1;
temp&=0xF0;
if(temp !=0xF0)
{
delay10ms(1);
temp=P1;
temp&=0xF0;
if(temp !=0xF0)
{
temp=P1;
temp&=0xF0;
switch(temp)
{
case 0x70:
key=1;break;
case 0xB0:
key=2;break;
case 0xD0:
key=3;break;
}
Dispaly(key);
}
}
P1=0xFF;
P1_2=0;
temp=P1;
temp&=0xF0;
if(temp !=0xF0)
{
delay10ms(1);
temp=P1;
temp&=0xF0;
if(temp !=0xF0)
{
temp=P1;
temp&=0xF0;
switch(temp)
{
case 0x70:
key=4;break;
case 0xB0:
key=5;break;
case 0xD0:
key=6;break;
}
Dispaly(key);
}
}
P1=0xFF;
P1_1=0;
temp=P1;
temp&=0xF0;
if(temp !=0xF0)
{
delay10ms(1);
temp=P1;
temp&=0xF0;
if(temp !=0xF0)
{
temp=P1;
temp&=0xF0;
switch(temp)
{
case 0x70:
key=7;break;
case 0xB0:
key=8;break;
case 0xD0:
key=9;break;
}
Dispaly(key);
}
}
P1=0xFF;
P1_0=0;
temp=P1;
temp&=0xF0;
if(temp !=0xF0)
{
delay10ms(1);
temp=P1;
temp&=0xF0;
if(temp !=0xF0)
{
temp=P1;
temp&=0xF0;
switch(temp)
{
case 0x70:
key=14;break;
case 0xB0:
key=0;break;
case 0xD0:
key=15;break;
}
Dispaly(key);
}
}
}
//延时程序
void delay10ms(unsigned char time)
{
unsigned char a,b,c;
for(a=0;afor(b=0;b<10;b++)
for(c=0;c<120;c++)
;
}
void Dispaly(unsigned char k)//显示程序
{
P0=table[k];
P2_1=0;
}
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