text1.c

个人单片机入门程序集合 。很适合刚学单片机的人。用的是keil proteus

#include<reg51.h>
#include<intrins.h>
#define uint unsigned int
#define uchar unsigned char
//数据口定义
#define lcd1602_bus P3		 

//引脚定义
sbit rs_1602=P2^5;	     
sbit rw_1602=P2^6;
sbit e_1602=P2^7;

//ASCII码表
/**********0---9**************/
unsigned  int  code table[10]={0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39};
/**********a---z**************/
unsigned  int code table1[26]={0x61,0x62,0x63,0x64,0x65,0x66,0x67,0x68,0x69,0x6a,0x6b,0x6c,0x6d,
                               0x6e,0x6f,0x70,0x71,0x72,0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7a};
/***********A---Z*************/
unsigned  int code table2[26]={0x41,0x42,0x43,0x44,0x45,0x46,0x47,0x48,0x49,0x4a,0x4b,0x4c,0x4d,
                               0x4e,0x4f,0x50,0x51,0x52,0x53,0x54,0x55,0x56,0x57,0x58,0x59,0x5a};

//基本变量定义
//uchar cnt;
// unsigned int d[3];
/*
hexstoascii2(unsigned int hex)
{
d[0]=table[hex/10];
hex=hex%10;
d[1]=table[hex]; 
}

hexstoascii3(unsigned int hex)
{
d[0]=table[hex/100];
hex=hex%100;
d[1]=table[hex/10];
hex=hex%10;
d[2]=table[hex];
}
 */
/**********************************lcd1602******************************************/

/*********延时子程序**********/
void delay(uchar dy)
{
  while(--dy);
} 

/***********忙判断标志，返回一个位BF********************/
bit lcd1602_busy(void)
{
	uchar busy_flag;
	rs_1602=0;
	rw_1602=1;
	_nop_();
	e_1602=1;
	_nop_();
	lcd1602_bus=0xff;
	busy_flag=lcd1602_bus;	 //e在高电平时读 
	e_1602=0;
	return (bit)(busy_flag&0x80);    //BF=1; BUSY  返回一个位
}


/********写命令，有两个参数，一个是要写的命令控制字，
第二个是用来控制是否进行忙标志的判断。
busyflag=1;
判断： 为0 
***************/
void lcd1602_wrcmd(unsigned char lcdcmd)
{
   	while(lcd1602_busy());	   //等待空闲
	lcd1602_bus=lcdcmd;
	rs_1602=0;
	rw_1602=0;
	_nop_();
	e_1602=1;
	_nop_();
	_nop_();
	e_1602=0;      //产生一个下沿	  
}



/***************向液晶写数据******************/
void lcd1602_wrdata(uchar lcddata)
{
 while(lcd1602_busy());	      //等待空闲
 lcd1602_bus=lcddata;		  //在下沿的时候写数据
 rs_1602=1;
 rw_1602=0;
 _nop_();
 e_1602=1;
 _nop_();
 _nop_();
 e_1602=0;
 //lcd_bus=0xff;
}


/************液晶的清屏************/
void lcd1602_clear(void)
{
  lcd1602_wrcmd(0x01);	   //液晶清屏控制字	并延时>40us
  delay(100);
}

/***********1602液晶的初始化***************/
void lcd1602_init(void)
{
  lcd1602_wrcmd(0x38);	    	//功能设置－－－－－8位数据接口，两行显示，5*7点阵字符显示
  delay(100);
  lcd1602_wrcmd(0x0f);	       //显示开关控制－－－－显示开关开，光标开关关，闪烁开关关
  delay(100);
  lcd1602_wrcmd(0x06);	       //输入方式设置，AC自增1, S=0;
  delay(100);		   
  lcd1602_wrcmd(0x01);         //清屏
  delay(100);
}


/**********4*4矩阵键盘****************/
/************
 矩阵键盘
D---------P1.0
C---------P1.1
B---------P1.2
A---------P1.3
1---------P1.4
2---------P1.5
3---------P1.6
4---------P1.7
按键值的分布
   D   C  B  A
1〔15 14 13 12〕
2〔11 10  9  8〕
3〔 7  6  5  4〕
4〔 3  2  1  0〕
利用已有的那个按键程序  
*************/

uchar getkey_ii()

{
    unsigned char keycode=0xff,temp,i;
    P1=0x0f;
    temp=P1&0x0f;
    if(temp!=0x0f)        //判是否有键按下
    {
       // beep=0;
        P1=0xef;          //自第0行开始扫描输出，自列读入键值
        for(i=0;i<4;i++)
        {
            temp=P1&0x0f;
            if(temp==0x07)     //判断第0列是否有键按下
            {    
                keycode=i*4+0;
                break;
            }
            else if(temp==0x0b)//判断第1列是否有键按下
            {
                keycode=i*4+1;
                break;                                  						  
            }
            else if(temp==0x0d)//判断第2列是否有键按下
            {
                keycode=i*4+2;
                break;
            }
            else if(temp==0x0e)//判断第3列是否有键按下
            {
                keycode=i*4+3;
                break;
            }
            P1=(P1<<1)|0x1;
        }

         while((P1&0x0f)!=0x0f)   //等待释放
         {
             P1=0x0f;
         }
    //   beep=1;                                             
        
     }
     return keycode;
}

/**********lcd1602 测试程序**********************/
//上电后lcd1602 显示  
//            "System of P.H.Y"      
//             "   Welcome!"
//
//分别按矩阵最右下角的三个按键 分别出现下面几个显示界面：
//   key=0 显示
//    		"    2005/7/28";
//			"      20:27";
//   key=1 显示
//    		"<>?+-*/()="    
//     		"`-=\[]/.,;"    
//   key=2 显示
//         "!@#$%^&*()_+|~"
//         "!@#$%^&*()_+|~"

void xianshi(unsigned long a)
{          unsigned long c,p=0;
				if (a!=0) 
 			{	c=a/100000000;
				if(c!=0)
                {lcd1602_wrdata(c+0x30);
 			     p=1;
				 }
                delay(100);
				c=(a%100000000)/10000000;
				if(c!=0 || p==1 )
                {lcd1602_wrdata(c+0x30);
 			     p=1;
				 }
                delay(100);
				c=(a%10000000)/1000000;
				if(c!=0 || p==1 )
                {lcd1602_wrdata(c+0x30);
 			     p=1;
				 }
                delay(100);
				c=(a%1000000)/100000;
				if(c!=0 || p==1 )
                {lcd1602_wrdata(c+0x30);
 			     p=1;
				 }
                delay(100);
				c=(a%100000)/10000;
				if(c!=0 || p==1 )
                {lcd1602_wrdata(c+0x30);
 			      p=1;
				 }
                delay(100);
                c=(a%10000)/1000;
                if(c!=0 || p==1)
                 {lcd1602_wrdata(c+0x30);
 			      }
                delay(100);
				c=(a%1000)/100;
                if(c!=0 || p==1)
                 {lcd1602_wrdata(c+0x30);
 			      }
                delay(100);
				c=(a%100)/10;
                if(c!=0 || p==1)
                 {lcd1602_wrdata(c+0x30);
 			      }
                delay(100);
	            c=a%10+0x30;
         	    lcd1602_wrdata(c);   
				delay(100);
				
            }
}

void main()																	  		 
{	
   
    uchar i;
//	uint t;
	uchar str[]="    welcome   ";
    uchar str0='7';
	uchar str1='4';
	uchar str2='1';
    uchar str3=' ';
	uchar str4='8';
	uchar str5='5';
    uchar str6='2';
	uchar str7='0';
	uchar str8='9';
    uchar str9='6';
	uchar str10='3';
	uchar str11='=';
	uchar str12='/';
	uchar str13='*';
    uchar str14='-';
	uchar str15='+';
	unsigned long c,a=0,b;
	uchar j;     //标记加减乘除
	
	
	

	unsigned char offset=0x80;   //定义一个偏移地址变量，lcd1602 写入控制字时用到
	unsigned char key;
//	unsigned int count1=10;
//	unsigned int count2=297;
	delay(2);
	lcd1602_bus=0xff;
	lcd1602_init();
    lcd1602_wrcmd(offset+0x00);
	for(i=0;i<12;i++)   lcd1602_wrdata(str[i]);    
    //	lcd1602_wrcmd(offset+0x40);
    //	for(i=0;i<11;i++)   lcd1602_wrdata(str02[i]);

//	lcd1602_clear();
    while(1)
        {    
		   
           
		   key=getkey_ii();
//		   hexstoascii2(count1);
//         hexstoascii3(count2);
		  if(key==0)
		  	{ 
				lcd1602_clear();
     	  	    lcd1602_wrcmd(offset+0x00);
			           
			    a=a*10+7;
	      	    xianshi(a);  
		        //lcd1602_wrcmd(offset+0x40);
			//	for(i=0;i<11;i++) lcd1602_wrdata(str12[i]);
			 }
		   else if (key==1)
		  	{ 
				lcd1602_clear();
     	  	    lcd1602_wrcmd(offset+0x00);
								
	      	    lcd1602_wrcmd(0x0c);
				 a=a*10+4;
				 xianshi(a);  
		        //lcd1602_wrcmd(offset+0x40);
				//for(i=0;i<15;i++) lcd1602_wrdata(str22[i]);
			 }
		   else if (key==2)
		   	 {
				lcd1602_clear();
     	  	    lcd1602_wrcmd(offset+0x00);
	      	      
                a=a*10+1;
				xianshi(a);  
		      //  lcd1602_wrcmd(offset+0x40);
			//	for(i=0;i<15;i++) lcd1602_wrdata(str31[i]);
			 }
           else if (key==3)
		   	 {
				lcd1602_clear();
     	  	    lcd1602_wrcmd(offset+0x00);
	      	    a=0; 
 
            }
           else if (key==4)
		   	 {
				lcd1602_clear();
     	  	    lcd1602_wrcmd(offset+0x00);
				a=a*10+8;
	      	    xianshi(a);  
            }
           else if (key==5)
		   	 {
				lcd1602_clear();
     	  	    lcd1602_wrcmd(offset+0x00);
				a=a*10+5;
	      	    xianshi(a);  
            }
            else if (key==6)
		   	 {
				lcd1602_clear();
     	  	    lcd1602_wrcmd(offset+0x00);
				a=a*10+2;
	      	    xianshi(a);  
            }
			else if (key==7)
		   	 {
				lcd1602_clear();
     	  	    lcd1602_wrcmd(offset+0x00);
				xianshi(a);  
				a=a*10+0;
	      	    lcd1602_wrdata(str7);
            }
			else if (key==8)
		   	 {
				lcd1602_clear();
     	  	    lcd1602_wrcmd(offset+0x00);
				a=a*10+9;
	      	   xianshi(a);  
            }
			else if (key==9)
		   	 {
				lcd1602_clear();
     	  	    lcd1602_wrcmd(offset+0x00);
				a=a*10+6;
	      	   xianshi(a);  
            }
			else if (key==10)
		   	 {
				lcd1602_clear();
     	  	    lcd1602_wrcmd(offset+0x00);
				a=a*10+3;
	      	   xianshi(a);  
            }
			else if (key==11)
		   	 {  uchar p=0;
				lcd1602_clear();
     	  	    lcd1602_wrcmd(offset+0x00);
				if (j==12)
			    {
			     c=b/a;
				 xianshi(c);
				 if (c==0) lcd1602_wrdata(0x30);
                }


                if (j==13)
			    {
			     c=b*a;
				 xianshi(c);
				 if (c==0) lcd1602_wrdata(0x30);
                }


				if (j==14)
			    {
			     c=b-a;
				 xianshi(c);
				 if (c==0) lcd1602_wrdata(0x30);
                }

				if (j==15)
			    {
			     c=b+a;
				 xianshi(c);
				 if (c==0) lcd1602_wrdata(0x30);
                }
                a=0;
				b=0;

            }
			else if (key==12)
		   	 {
				lcd1602_clear();
     	  	    lcd1602_wrcmd(offset+0x00);
	      	    lcd1602_wrdata(str12);
				j=12;
				b=a;
				a=0;
            }
			else if (key==13)
		   	 {
				lcd1602_clear();
     	  	    lcd1602_wrcmd(offset+0x00);
	      	    lcd1602_wrdata(str13);
				j=13;
				b=a;
				a=0;
            }
			else if (key==14)
		   	 {
				lcd1602_clear();
     	  	    lcd1602_wrcmd(offset+0x00);
	      	    lcd1602_wrdata(str14);
				j=14;
				b=a;
				a=0;
            }
			else if (key==15)
		   	 {
				lcd1602_clear();
     	  	    lcd1602_wrcmd(offset+0x00);
	      	    lcd1602_wrdata(str15);
				b=a;
				j=15;
				a=0;
				
            }



            }

}