/*******************************************************************************************
课题：1602LCD显示仿手机键盘按键
LCD接口：P0.0-P0.7 TO D0-D7
P2.0 TO RS
P2.1 TO RW
P2.2 TO E
蜂鸣器： P2.7
键盘： 列(ltr) P1.0-P1.2
行(utd) P1.4-P1.7
*******************************************************************************************/
#include <reg52.h>
#include <string.h>
#define uint unsigned int
#define uchar unsigned char
sbit RS=P2^0;
sbit RW=P2^1;
sbit EN=P2^2;
sbit SPK=P2^7;
uchar code KeyPad_Chars[12][6]={"1 ","2ABC","3DEF","4GHI","5JKL","6MNO","7PQRS","8TUV","9WXYZ","*","0+","#"};//初始化键盘字库
uchar code Line1[]=" LJL'S Cellphone";//固定字符串
uchar code Line2[]="Your Key: ";
uchar KeyNo=-1; //键位0~11
uchar Inner_Idx=0; //同键位内部切换
uchar tSpan=0; //同键位连续按键时间间隔
/**********************毫秒延时************************************/
void DelayMS(uint ms)
{
uchar i;
while(ms--)
{
for(i=0;i<110;i++);
}
}
/************************忙检测***********************************/
uchar Busy_Waiting()
{
uchar lcd_status;
RS=0;
RW=1;
EN=1;
DelayMS(1);
lcd_status=P0;
EN=0;
return lcd_status;
}
/************************写数据***********************************/
void Write_LCD_DATA(uchar dat)
{
while((Busy_Waiting()&&0x80)==0x80);
RS=1;RW=0;EN=0;P0=dat;EN=1;DelayMS(1);EN=0;
}
/************************写指令********************************/
void Write_LCD_Command(uchar cmd)
{
while((Busy_Waiting()&0x80)==0x80);
RS=0;
RW=0;
EN=0;
P0=cmd;EN=1;DelayMS(1);EN=0;
}
/*****************初始化***********************************/
void Init_LCD()
{
Write_LCD_Command(0x38);
DelayMS(1);
Write_LCD_Command(0x01);
DelayMS(1);
Write_LCD_Command(0x06);
DelayMS(1);
Write_LCD_Command(0x0c);
DelayMS(1);
}
/**********************键盘扫描************************************/
void Keys_Scan()
{
P1=0x0f; //高四位置0
DelayMS(1);
switch(P1) //判断列
{
case 0x0e: KeyNo=0;break;
case 0x0d: KeyNo=1;break;
case 0x0b: KeyNo=2;
}
P1=0xf0; //第四位置0
DelayMS(1);
switch(P1) //根据行数加KN
{
case 0xe0: KeyNo+=0;break;
case 0xd0: KeyNo+=3;break;
case 0xb0: KeyNo+=6;break;
case 0x70: KeyNo+=9;
}
}
/**********************蜂鸣器**************************************/
void Beep()
{
SPK=1;
DelayMS(400);
SPK=0;
}
/**********************主程序**************************************/
void main()
{
uchar i,Pre_KeyNo=-1;
IE=0x82;
TMOD=0x01;
TH0=-50000/256;
TL0=-50000%256;
P0=P2=0xff;
SPK=0;
DelayMS(10);
Init_LCD(); //初始化
Set_LCD_POS(0); //显示第一行
for(i=0;i<16;i++)
Write_LCD_DATA(Line1[i]);
Set_LCD_POS(0x40); //显示第二行
for(i=0;i<16;i++)
Write_LCD_DATA(Line2[i]);
while(1)
{
P1=0xf0;
if(P1!=0xf0)Keys_Scan();//按键检测
else continue;
if(Pre_KeyNo!=KeyNo) //新按键判断
{
Pre_KeyNo=KeyNo;
tSpan=0; //间隔请0
Inner_Idx=0; //按键内部切换清0
TR0=1; //启动定时器
}
else //如为同一按键
{
if(tSpan<=40)
Inner_Idx=(Inner_Idx+1)%strlen(KeyPad_Chars[KeyNo]); //显示下一个
else
Inner_Idx=0;
tSpan=0;
}
Set_LCD_POS(0x4b);
Write_LCD_DATA(KeyPad_Chars[KeyNo][Inner_Idx]); //显示按键
Beep();
DelayMS(100);
}
}
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