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#include"reg52.h"
#define led P0 //定義led數(shù)碼管連在P0口
#define key P1 //定義矩陣鍵盤(pán)連在P1口
#define LCD1602_D P0 //lcd I/O口連在P0口
#define uchar unsigned char
#define uint unsigned int
sbit E=P2^7; //定義lcd端口
sbit RW=P2^5;
sbit RS=P2^6;
void LcdWriteCom(uchar com); //函數(shù)聲明
void WriteDat(uchar dat);
void Lcdxs(uchar x,uchar y,uchar dat);
uchar code lcd[]={0x31,0x32,0x33,0x2b,0x34,0x35,0x36,0x2d,0x37,0x38,0x39,0x2a,0x23,0x30,0x2f,0x3d}; // 123+456-789*#0/=
uchar a;
void delay(uint i) //延時(shí)函數(shù)
{
while(i--)
{;}
}
void keydownup() //矩陣按鍵掃描程序
{
char b=0;
key=0x0f;
if(key!=0x0f)
{
delay(1000); //延時(shí)消抖
if(key!=0x0f)
{
key=0x0f; //檢測(cè)列 使高四位為低，低四位為高，判斷低四位是否有低電平出現(xiàn)（有則key!=0x0f）
switch(key)
{
case 0x07:a=0;break;
case 0x0b:a=1;break;
case 0x0d:a=2;break;
case 0x0e:a=3;break;
}
key=0xf0; //檢測(cè)行 使高四位為高，低四位為低，判斷高四位是否有低電平出現(xiàn)（有則key!=0xf0）
switch(key)
{
case 0x70:a=a; break;
case 0xb0:a=a+4; break;
case 0xd0:a=a+8; break;
case 0xe0:a=a+12;break;
}
while((b<50)&&key!=0xf0) //判斷按鍵按下后是否松開(kāi) 超時(shí)或者按鍵松開(kāi)則跳出循環(huán)
{
delay(1000);
b++;
}
}
}
}
void LcdWriteCom(uchar com) //寫(xiě)指令函數(shù)
{
E=0; //允許使能
RS=0; //指令
RW=0; //寫(xiě)入
LCD1602_D=com;
delay(1);
E=1; //寫(xiě)入時(shí)序
delay(1);
E=0;
}
void WriteDat(uchar dat) //寫(xiě)數(shù)據(jù)函數(shù)
{
E=0; //允許使能
RS=1; //數(shù)據(jù)
RW=0; //寫(xiě)入
LCD1602_D=dat;
delay(1);
E=1; //寫(xiě)入時(shí)序
delay(1);
E=0;
}
void Lcdxs(uchar x,uchar y,uchar dat) //顯示一個(gè)字符的函數(shù)
{
uchar t;
if(y==1)
t=0x80+x;
else
t=0xc0+x;
LcdWriteCom(t);
WriteDat(dat);
}
void main()
{
LcdWriteCom(0x38); //開(kāi)顯示
LcdWriteCom(0x0c); //開(kāi)顯示不開(kāi)光標(biāo)
LcdWriteCom(0x06); //寫(xiě)一個(gè)指針加1
LcdWriteCom(0x01); //清屏
delay(100);
while(1)
{
keydownup(); //矩陣按鍵掃描程序
Lcdxs(0,1,lcd[a]); //顯示按鍵按下后數(shù)組中對(duì)應(yīng)的值
}
}
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