lcd 18b20.c

本程序通过AM-51H学习板测试

/************************************
  连接方式：RS---P2.5 RW---P2.6    E---P2.7
  18B20.2---P1.0
***************************************/
#include<reg52.h>
#define uchar unsigned char
#define uint unsigned int
 uchar code table[]="wen du:";
uchar code table1[]="time:";
sbit lcden=P2^7;
sbit lcdrs=P2^5;
sbit lcdrw=P2^6;
   sbit DQ=P1^0; 
	 sbit P3_2=P3^2;	
unsigned int		shi=23;
unsigned int		fen=58;
unsigned int		miao=55;
unsigned int		deda=0;

unsigned char   XiSh_Buf[8];
   unsigned char   wd[6];
uchar num,xz=0;
uchar num1[3];
uint ii,aa;
  void delay(void)
{
	uint x,y;
	for(x=5;x>0;x--)
		for(y=7269;y>0;y--);
}
 	void Delay(int num)//延时函数
{
	while(num--) ;
}
  void delay1(void)
{
	uint y;
	
		for(y=100;y>0;y--);
}
void delayms(void)
{
	  unsigned char k,y;
	for (k=1000; k>0; k--)
	for (y=50;y>0;y--);
}
 void Init_DS18B20(void)//初始化ds1820
{
	unsigned char x=0;
	DQ = 1;    //DQ复位
	Delay(8);  //稍做延时
	DQ = 0;    //单片机将DQ拉低
	Delay(80); //精确延时 大于 480us
	DQ = 1;    //拉高总线
	Delay(14);
	x=DQ;      //稍做延时后 如果x=0则初始化成功 x=1则初始化失败
	Delay(20);
}
  void WriteOneChar(unsigned char dat)//写一个字节
{
	unsigned char i=0;
	for (i=8; i>0; i--)
	{
		DQ = 0;
		DQ = dat&0x01;
		Delay(5);
		DQ = 1;
		dat>>=1;
	}
}
unsigned char ReadOneChar(void)//读一个字节
{
	unsigned char i=0;
	unsigned char dat = 0;
	for (i=8;i>0;i--)
	{
		DQ = 0; // 给脉冲信号
		dat>>=1;
		DQ = 1; // 给脉冲信号
		if(DQ)
		dat|=0x80;
		Delay(4);
	}
	return(dat);
}
  unsigned int ReadTemperature(void)//读取温度
{
	unsigned char a=0;
	unsigned char b=0;
	unsigned int t=0;
	float tt=0;
	Init_DS18B20();
	WriteOneChar(0xCC); // 跳过读序号列号的操作
	WriteOneChar(0x44); // 启动温度转换
	Init_DS18B20();
	WriteOneChar(0xCC); //跳过读序号列号的操作
	WriteOneChar(0xBE); //读取温度寄存器
	a=ReadOneChar();  //读低8位
	b=ReadOneChar(); //读高8位
	t=b;
	t<<=8;
	t=t|a;
	tt=t*0.0625;
	t= tt*10+0.5; //放大10倍输出并四舍五入
	return(t);
}

  void write_com(uchar com)
{
	lcdrs=0;
	   lcdrw=0;
	P0=com;
	delay1();
	lcden=1;
	delay1();
	lcden=0;
}
	void write_data(uchar date)
{
	lcdrs=1;
	   lcdrw=0;
	P0=date;
	delay1();
	lcden=1;
	delay1();
	lcden=0;
}
  void init()
{

	lcden=0;
	write_com(0x38);
		  delay1();
		   	write_com(0x38);
		  delay1();
		   	write_com(0x38);
		  delay1();
		   write_com(0x38);	   
			write_com(0x08);
		   	write_com(0x01);
	write_com(0x0c);
	write_com(0x06);
	//	   write_com(0x80+0x03);
	//		write_com(0x80+0x40);
	
	}
 	  void initTimer (void)
{
// 	timer0_tick=0;
	EA=0; 
 	TMOD=0x01;
	TH0=0xb0;
	TL0=0;         
//	TH1=-9460/256;
//	TL1=-9460%256;         //初始化计数器初值
 	PT0=1;
	TR0=1;
	ET0=1;
 //	TR1=1;
 //	ET1=1;
    EA =1;

}


void timer0 (void) interrupt 1
{	 
//	unsigned int i;
	TR0=0;
    TH0=0x3c;
	TL0=0xb0;         	
    TR0=1;
    deda++;	
	 if(deda==20)
	 {	miao+=1; 
	 deda=0;
	 if(miao==60)
	 {fen+=1;
	 miao=0;
	 if(fen==60)
	 {shi+=1;
	 fen=0;
	 if(shi==24)
	 {shi=0;}
	 }
	 }
		XiSh_Buf[7]= miao%10+'0'; 
 		XiSh_Buf[6]= miao/10+'0';

 		XiSh_Buf[4]= fen%10+'0';		
 		XiSh_Buf[3]= fen/10+'0';
		 
 		XiSh_Buf[1]= shi%10+'0';
		XiSh_Buf[0]= shi/10+'0';		

	 }
}
uchar kbscan(void)
{
	unsigned char sccode,recode;
	P1=0x07;  //发0扫描,列线输入
	if ((P1 & 0x07) != 0x07)  //有键按下
	{
		delayms();   //延时去抖动
		if ((P1&0x07)!= 0x07)
		{
			sccode = 0xF7;    //逐行扫描初值
			while((sccode&0x01)!=0)
			{
			    P1=sccode;
				if((P1&0x07)!=0x07)
				{
				    recode=(P1&0x07)|0xf8;
					return((~sccode)+(~recode));
				 }
		        else
				sccode=(sccode<<1)|0x01;
			}
		}
	}
	return 0;  //无键按下，返回0
} 
 void dd(void)
{uchar key;
key=kbscan();
if(xz==1){	switch(key)
		  {
		    case 0x24: 	shi-=1; if(shi>=24)	  shi=23;
			          break;
			case 0x22:
			          	 shi+=1;	if(shi>=24)	  shi=0;
					  break;
			 default:;	} }
			 else{	switch(key)
		  {
		    case 0x24: 	fen-=1; if(fen>=60)	   shi=59;
			          break;
			case 0x22:
			          	 fen+=1;	if(fen>=60)	   fen=0;
					  break;
			 default:;	} }
		XiSh_Buf[7]= miao%10+'0'; 
 		XiSh_Buf[6]= miao/10+'0';

 		XiSh_Buf[4]= fen%10+'0';		
 		XiSh_Buf[3]= fen/10+'0';
		 
 		XiSh_Buf[1]= shi%10+'0';
		XiSh_Buf[0]= shi/10+'0';
}
	 void main()
{	 
XiSh_Buf[5]=0x3A;
	XiSh_Buf[2]=0x3A;
	wd[3]='.';
	wd[5] =0xdf;
	
	init();
	 initTimer(); 
	 
	 // write_data('1')	;
	 for(num=0;num<7;num++)
	{
		write_data(table[num]);
		//delay1();
	}
	   write_com(0x80+0x40);
	  for(num=0;num<5;num++)
	{
		write_data(table1[num]);
		//delay1();
	}
	while(1)
	 {	 
	  aa= ReadTemperature();
			  
	  wd[0]=(aa/1000)%10+'0';
	  wd[1]=(aa/100)%10+'0';
	  wd[2]=(aa/10)%10+'0';
	  wd[4]=(aa/1)%10+'0';
	 write_com(0x80+0x08);
	 	for(num=0;num<6;num++)
	{	 
		write_data(wd[num]);
	//	delay2();
	}
	
	 if(P3_2==0)
	   {
		delayms();   //延时去抖动
		if(P3_2==0)
		
	  {	xz+=1;
if(xz==3) xz=0;	}}
 switch(xz)
	{  	
	case 1: dd();  
break;
	  case 2: dd();	
break;
	
	default:;	
		}
		write_com(0x80+0x46);
	for(num=0;num<8;num++)
	{
		write_data(XiSh_Buf[num]);
		//delay2();
	}
	}
/*	for(num=0;num<16;num++)
	{
		write_com(0x18);
		delay1();
	}	*/			
	/* while(1)  {
		   
		  write_com(0x0c);
	 for(num=0;num<999;num++)
	 { 	  num1[0]=(num/100)%10;
	 	num1[1]=(num/10)%10;
		 num1[2]=(num/1)%10;
		 write_com(0x80+0x4d);
	   for(ii=0; ii<3; ii++)
	 {write_data(num1[ii]+'0');
	  	delay1();  }
	 }
	 }	  */
	//	while(1);
	}