单片机和8255扩展16矩形键盘仿真与源程序 -

#include <REGX52.H>
#include<intrins.h>
#include<absacc.h>
#define uchar unsigned char
#define uint unsigned int
//ABC口，控制定义
#define PA XBYTE[0X7CFF]
#define PB XBYTE[0X7DFF]
#define PC XBYTE[0X7EFF]
#define COM XBYTE[0X7FFF]
//定义键盘
uchar code JP[]={
0xe7,0xeb,0xed,0xee,
0xd7,0xdb,0xdd,0xde,
0xb7,0xbb,0xbd,0xbe,
0x77,0x7b,0x7d,0x7e,
};
uchar code lcd[]={ '0','1','2','3',
'4','5','6','7',
'8','9', '+','-',
'*','/', '=',
};
//定义控制引脚
sbit RS=P3^0;
sbit RW=P3^1;
sbit EN=P3^2;
sbit WR1=P3^6;
sbit RD1=P3^7;
//延时
void DelayMS(uint ms)
{
uchar i;
while(ms--)
{
for(i=0;i<120;i++);
}
}
//1602写指令
void Write_LCD_Command(uchar cmd)
{
RS=0;RW=0;EN=0;
P1=cmd;
DelayMS(5);
EN=1;
DelayMS(5);
EN=0;
}
//1602写数据
void Write_LCD_data(uchar dat)
{
RS=1;RW=0;EN=0;
P1=dat;
DelayMS(5);
EN=1;
DelayMS(5);
EN=0;
}
//1602读数据
void read(uchar rea)
{
RS=1;RW=1;EN=1;
P1=rea;
DelayMS(5);
EN=0;
DelayMS(5);
EN=1;
}
//1602初始化
void Ini_LCD()
{
Write_LCD_Command(0x0F);DelayMS(5);//设置功能
Write_LCD_Command(0x38);DelayMS(5);
Write_LCD_Command(0x06);DelayMS(5);//AC+1
Write_LCD_Command(0x01);DelayMS(5);//清屏
Write_LCD_Command(0x0c);DelayMS(5);//显示功能
}
//1602显示位置
void WAdd( uchar x,uchar y)
{
Write_LCD_Command(0x80+x);
Write_LCD_data(y);
}
//主函数
void main()
{
COM=0X90;
Ini_LCD();
while(1)
{
uchar key,temp,num,a;
PC=0X0F;
if(PC!=0X0F)
{
DelayMS(10);
if(PC!=0X0F)
{
temp=PC;
PC=0xf0;
key=temp|PC;
if(key==0x7e)
{
Write_LCD_Command(0x01);DelayMS(5);//清屏
……………………
…………限于本文篇幅余下代码请从51黑下载附件…………

复制代码