ps-lcd1602.c

51单片的源程序

/*中断程序，帮助了解中断事件*/

#include <reg51.h>
#include <intrins.h>

sbit key_data=P1^7;		//定义键盘接口的数据脚
sbit key_clk=P3^2;	//定义键盘接口的时钟脚
sbit SPK=P3^4;		//继电器
sbit JDQ=P3^5;		//蜂鸣器
sbit LCD_RS=P1^0;//定义引脚
sbit LCD_RW=P1^1;
sbit LCD_E=P1^2;
#define LCD_Data P2
#define Busy    0x80 //用于检测LCD状态字中的Busy标识
bit BF=0;
bit shift=0;

void WriteDataLCD(unsigned char WDLCD);
void WriteCommandLCD(unsigned char WCLCD,BuysC);
unsigned char ReadDataLCD(void);
unsigned char ReadStatusLCD(void);
void LCDInit(void);
void DisplayOneChar(unsigned char X, unsigned char Y, unsigned char DData);
void DisplayListChar(unsigned char X, unsigned char Y, unsigned char code *DData);
void Delay5Ms(void);
void Delay400Ms(void);

unsigned char code uctech[] = {"Happy every day"};
unsigned char code net[] = {"<LHJ>"};
unsigned char code unshift[3]={0x1c,0x32,0x21};
unsigned char code unshiftstr[3]={'a','b','c'};


//code unsigned char tmpdate[]={0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80};//定义常量做为输出
unsigned char keyv=0;			//变量为常量的索引
unsigned int intNum=0;			//计数接收个数
unsigned char key_up=1;			//检测按键按下否
unsigned char disnum=0;

void ldedata(unsigned char scandata);//数据处理

void main(void)     //入口函数
{
	Delay400Ms(); //启动等待，等LCD讲入工作状态
 	LCDInit(); //LCM初始化
	Delay5Ms(); //延时片刻(可不要)
	DisplayListChar(0, 0, uctech);
	DisplayListChar(5, 5, net);
	disnum=16;

	EA=1;			//首先开启总中断
	EX0=1;  		//开启外部中断 0
	IT0=1;        // 设置成 下降沿触发方式
	do{					//循环
		if(BF)
			ldedata(keyv);
		else
			EA=1;
	}
	while(1);	
}

void key_scan()   interrupt 0    //外部中断 0 
{					
	if((intNum>0)&&(intNum<9)){
		keyv=keyv>>1;
		if(key_data)
			keyv=keyv|0x80;				
	}
	intNum++;
	while(!key_clk)
	if(intNum>10){
		intNum=0;
		BF=1;
		EA=0;			//等待处理完键值再开启
	}

	//P2=~tmpdate[i];
}

void ldedata(unsigned char scandata)
{
	unsigned char Tempdata,i;
	if(!key_up)	//键盘松开时
	{
		switch(scandata){
		case 0xf0:
			key_up=1;
			break;
		case 0x12:	//左SHIFT，可以下面写相应处理
			shift=1;
			break;
		case 0x59:	//右SHIFT，可以下面写相应处理
			shift=1;
			break;
		default:
			if(disnum>15){
				WriteCommandLCD(0x01,1); //显示清屏
				disnum=0;
			}
			if(!shift){
				for(i=0;i<3;i++){
				if(unshift[i]==scandata){
					DisplayOneChar(disnum,0, unshiftstr[i]);
					break;
				}
				}
				disnum++;
			}
			break;
		}
	}
	else{
		key_up=0;
		switch(scandata){
		case 0x12:
			shift=0;
			break;
		case 0x59:
			shift=0;
			break;
		}
	}
	BF=0;		//标识字符处理完了
}

//写数据
void WriteDataLCD(unsigned char WDLCD)
{
 ReadStatusLCD(); //检测忙
 LCD_Data = WDLCD;
 LCD_RS = 1;
 LCD_RW = 0;
 LCD_E = 0; //若晶振速度太高可以在这后加小的延时
 LCD_E = 0; //延时
 LCD_E = 1;
}

//写指令
void WriteCommandLCD(unsigned char WCLCD,BuysC) //BuysC为0时忽略忙检测
{
 if (BuysC) ReadStatusLCD(); //根据需要检测忙
 LCD_Data = WCLCD;
 LCD_RS = 0;
 LCD_RW = 0; 
 LCD_E = 0;
 LCD_E = 0;
 LCD_E = 1; 
}

//读数据
unsigned char ReadDataLCD(void)
{
 LCD_RS = 1; 
 LCD_RW = 1;
 LCD_E = 0;
 LCD_E = 0;
 LCD_E = 1;
 return(LCD_Data);
}

//读状态
unsigned char ReadStatusLCD(void)
{
 LCD_Data = 0xFF; 
 LCD_RS = 0;
 LCD_RW = 1;
 LCD_E = 0;
 LCD_E = 0;
 LCD_E = 1;
 while (LCD_Data & Busy); //检测忙信号
 return(LCD_Data);
}

void LCDInit(void) //LCM初始化
{
 LCD_Data = 0;
 WriteCommandLCD(0x38,0); //三次显示模式设置，不检测忙信号
 Delay5Ms(); 
 WriteCommandLCD(0x38,0);
 Delay5Ms(); 
 WriteCommandLCD(0x38,0);
 Delay5Ms(); 

 WriteCommandLCD(0x38,1); //显示模式设置,开始要求每次检测忙信号
 WriteCommandLCD(0x08,1); //关闭显示
 WriteCommandLCD(0x01,1); //显示清屏
 WriteCommandLCD(0x06,1); // 显示光标移动设置
 WriteCommandLCD(0x0C,1); // 显示开及光标设置
}

//按指定位置显示一个字符
void DisplayOneChar(unsigned char X, unsigned char Y, unsigned char DData)
{
 Y &= 0x1;
 X &= 0xF; //限制X不能大于15，Y不能大于1
 if (Y) X |= 0x40; //当要显示第二行时地址码+0x40;
 X |= 0x80; // 算出指令码
 WriteCommandLCD(X, 0); //这里不检测忙信号，发送地址码
 WriteDataLCD(DData);
}

//按指定位置显示一串字符
void DisplayListChar(unsigned char X, unsigned char Y, unsigned char code *DData)
{
 unsigned char ListLength;

  ListLength = 0;
 Y &= 0x1;
 X &= 0xF; //限制X不能大于15，Y不能大于1
 while (DData[ListLength]>=0x20) //若到达字串尾则退出
  {
   if (X <= 0xF) //X坐标应小于0xF
    {
     DisplayOneChar(X, Y, DData[ListLength]); //显示单个字符
     ListLength++;
     X++;
    }
  }
}

//5ms延时
void Delay5Ms(void)
{
 unsigned int TempCyc = 5552;
 while(TempCyc--);
}

//400ms延时
void Delay400Ms(void)
{
 unsigned char TempCycA = 5;
 unsigned int TempCycB;
 while(TempCycA--)
 {
  TempCycB=7269;
  while(TempCycB--);
 };
}