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#include <reg51.h>
#include <intrins.h> //包含_nop_( )空函数指令的头文件
#define uchar unsigned char
#define uint unsigned int
#define out P0
sbit RS=P2^0; //位变量
sbit RW=P2^1; //位变量
sbit E=P2^2;
void lcd_initial(void); //位变量void lcd _initial(void); //LCD初始化函数
void check_busy(void); //检查忙标志函数
void write_command(uchar com); //写命令函数
void write_data(uchar dat); //写数据函数
void string(uchar ad ,uchar *s);
void delay(uint); //延时函数
unsigned char key_scan()
{
unsigned char key_temp0,key_temp1;
unsigned char key_num=0;
P1=0x0f;
key_temp0=P1;
if(key_temp0!=0x0f)
{
delay(5);
key_temp0=P1;
if(key_temp0!=0x0f)
{
P1=0xf0;
key_temp1=P1;
if(key_temp0==0x0e)
{
switch(key_temp1)
{
case 0xe0: key_num=4;break;
case 0xd0: key_num=3;break;
case 0xb0: key_num=2;break;
case 0x70: key_num=1;break;
default:key_num=0;break;
}
}
else if(key_temp0==0x0d)
{
switch(key_temp1)
{
case 0xe0: key_num=8;break;
case 0xd0: key_num=7;break;
case 0xb0: key_num=6;break;
case 0x70: key_num=5;break;
default:key_num=0;break;
}
}
else if(key_temp0==0x0b)
{
switch(key_temp1)
{
case 0xe0: key_num=12;break;
case 0xd0: key_num=11;break;
case 0xb0: key_num=10;break;
case 0x70: key_num=9;break;
default:key_num=0;break;
}
}
else if(key_temp0==0x07)
{
switch(key_temp1)
{
case 0xe0: key_num=16;break;
case 0xd0: key_num=15;break;
case 0xb0: key_num=14;break;
case 0x70: key_num=13;break;
default:key_num=0;break;
}
}
}
}
return key_num;
}
void main(void) //主函数
{
unsigned char key_num;
lcd_initial( ); //调用对LCD初始化函数
do
{
key_num=key_scan();
string(0x82,"Yu Wang wang"); //显示的第1行字符串
switch(key_num)
{
case 1 :string(0xC8,"1"); break;
case 2 :string(0xC8,"2"); break;
case 3 :string(0xC8,"3"); break;
case 4 :string(0xC8,"4"); break;
case 5 :string(0xC8,"5"); break;
case 6 :string(0xC8,"6"); break;
case 7 :string(0xC8,"7"); break;
case 8 :string(0xC8,"8"); break;
case 9 :string(0xC8,"9"); break;
case 10:string(0xC8,"10"); break;
case 11:string(0xC8,"11"); break;
case 12:string(0xC8,"12"); break;
case 13:string(0xC8,"13"); break;
case 14:string(0xC8,"14"); break;
case 15:string(0xC8,"15"); break;
case 16:string(0xC8,"16"); break;
}
delay(100); //延时
write_command(0x01); //写入清屏命令
delay(1); //延时
}while(1);
}
void delay(uint j) //1ms延时子程序
{
uchar i=250;
for(;j>0;j--)
{
while(--i);
i=249;
while(--i);
i=250;
}
}
void check_busy(void) //检查忙标志函数
{
uchar dt;
do
{
dt=0xff;
E=0;
RS=0;
RW=1;
E=1;
dt=out;
}while(dt&0x80);
E=0;
}
void write_command(uchar com) //写命令函数
{
check_busy();
E=0;
RS=0;
RW=0;
out=com;
E=1;
_nop_( );
E=0;
delay(1);
}
void write_data(uchar dat) //写数据函数
{
check_busy();
E=0;
RS=1;
RW=0;
out=dat;
E=1;
_nop_();
E=0;
delay(1);
}
void LCD_initial(void) //液晶显示器初始化函数
{
write_command(0x38); //写入命令0x38：8位两行显示，5×7点阵字符
write_command(0x0C); //写入命令0x0C：开整体显示，光标关，无黑块
write_command(0x06); //写入命令0x06：光标右移
write_command(0x01); //写入命令0x01：清屏
delay(1);
}
void string(uchar ad,uchar *s) //输出显示字符串的函数
{
write_command(ad);
while(*s>0)
{
write_data(*s++); //输出字符串，且指针增1
delay(50);
}
}
电路图和keil源程序在压缩包里面
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