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          1602LCD顯示器的使用
          
						
          
				作者：
				時間：2016-11-21
				來源：網(wǎng)絡(luò)
				
				
				
				
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			LCDE==P2.7 LCD使能
          DB==P0 數(shù)據(jù)位
          RD==P2.6 寫模式選擇
          WR==P2.5 讀寫使能
          本文引用地址：http://www.ex-cimer.com/article/201611/319276.htm

          指令碼： 二進(jìn)制 十六進(jìn)制
          清屏： 10000000 0x80;
          光標(biāo)歸位: X1000000 0x40或0xC0
          。。。。。。。。

          讀狀態(tài)輸入：RS=L，RW=H，E=H 輸出：DB0～DB7=狀態(tài)字
          寫指令輸入：RS=L，RW=L，E=下降沿脈沖，DB0～DB7=指令碼輸出：無
          讀數(shù)據(jù)輸入：RS=H，RW=H，E=H 輸出：DB0～DB7=數(shù)據(jù)
          寫數(shù)據(jù)輸入：RS=H，RW=L，E=下降沿脈沖，DB0～DB7=數(shù)據(jù)輸出：無
          上次寫的驅(qū)動：
          #include
          #include"LCD1602.h"
          #include
          #include
          #include
          #include
          #include
          sbit lcdrs =P3^0;//數(shù)據(jù)/命令選擇端（H/L）
          sbit lcdrw =P3^1;//讀/寫選擇端（H/L）
          sbit lcden =P3^2;//使能信號端
          char theDisplayLength=0,//保存應(yīng)該在當(dāng)前顯示的位數(shù)
          cursorPosition=0;//保存光標(biāo)所在顯示屏的位置
          char startAddress=0,endAddress=0;//保存顯示的起始和結(jié)束地址
          char LCDBuffer[16]={""};
          char ctrlStr[7]={".4f"};
          void delayms(int xms)  //延時X毫秒
          {
          int i, j;
          for(i=xms;i>0;i--)
          for(j=121;j>0;j--);
          } 
          void write_com(char com)//寫命令
          {
          lcdrs=0;
          P0=com;
          delayms(1);
          lcden=1;
          delayms(1);
          lcden=0; 
          }
          void write_data(char mydata)////寫數(shù)據(jù)
          {
          lcdrs=1;
          P0=mydata;
          delayms(1);
          lcden=1;
          delayms(1);
          lcden=0; 
          }
          void initLCD()//初始化
          {
           lcdrw=0;
           lcden=0;
           write_com(0x38); //設(shè)置16x2顯示，5x7點(diǎn)陣，8位數(shù)據(jù)接口
           write_com(0x0e); //00001dcb,d=1開顯示，c=1顯示光標(biāo)，b=1光標(biāo)閃爍
           write_com(0x06); //000001ns,n=1字符后地址指針加一，且光標(biāo)加            
            //s=1寫字符，正屏顯示左移（n=1）
           write_com(0x80); //設(shè)置數(shù)據(jù)地址指針(0-27H,40-67H)
           write_com(0x01); //01,顯示清屏：1，數(shù)據(jù)指針清零。2，所有顯示清零
          //02,顯示回車：1，數(shù)據(jù)指針清零。
           startAddress=0;
           endAddress=-1;
          }
          void write_position(char position)//字符要顯示在LCD哪個位置
          {
          lcdrs=0;
          lcdrw=0;
          lcden=0;
          P0=position;
          delayms(1);
          lcden=1;
          delayms(1);
          lcden=0;
          }
          ///功能函數(shù)部分
          void displayOneCharacter(char mydata,char position)
          {
          write_position(position);
          write_data(mydata);
          }
          void loadAndDisplay(bit judge)
          {
          if(judge==0)
          {
           //顯示上面的16個字符
          displayOneCharacter(LCDBuffer[0],0x80);
          displayOneCharacter(LCDBuffer[1],0x81);
          displayOneCharacter(LCDBuffer[2],0x82);
          displayOneCharacter(LCDBuffer[3],0x83);
          displayOneCharacter(LCDBuffer[4],0x84);
          displayOneCharacter(LCDBuffer[5],0x85);
          displayOneCharacter(LCDBuffer[6],0x86);
          displayOneCharacter(LCDBuffer[7],0x87);
          displayOneCharacter(LCDBuffer[8],0x88);
          displayOneCharacter(LCDBuffer[9],0x89);
          displayOneCharacter(LCDBuffer[10],0x8A);
          displayOneCharacter(LCDBuffer[11],0x8B);
          displayOneCharacter(LCDBuffer[12],0x8C);
          displayOneCharacter(LCDBuffer[13],0x8D);
          displayOneCharacter(LCDBuffer[14],0x8E);
          displayOneCharacter(LCDBuffer[15],0x8F);
          }
          if(judge==1)
          {
           //顯示下面的16個字符
           displayOneCharacter(LCDBuffer[0],0xC0);
          displayOneCharacter(LCDBuffer[1],0xC1);
          displayOneCharacter(LCDBuffer[2],0xC2);
          displayOneCharacter(LCDBuffer[3],0xC3);
          displayOneCharacter(LCDBuffer[4],0xC4);
          displayOneCharacter(LCDBuffer[5],0xC5);
          displayOneCharacter(LCDBuffer[6],0xC6);
          displayOneCharacter(LCDBuffer[7],0xC7);
          displayOneCharacter(LCDBuffer[8],0xC8);
          displayOneCharacter(LCDBuffer[9],0xC9);
          displayOneCharacter(LCDBuffer[10],0xCA);
          displayOneCharacter(LCDBuffer[11],0xCB);
          displayOneCharacter(LCDBuffer[12],0xCC);
          displayOneCharacter(LCDBuffer[13],0xCD);
          displayOneCharacter(LCDBuffer[14],0xCE);
          displayOneCharacter(LCDBuffer[15],0xCF);
          }
          }
          void setCursorPosition(char position) //移動光標(biāo)位置
          {
           char i;
          write_com(0x02);//光標(biāo)歸位
          for(i=0;i
            {
          write_com(0x14);//右移
            }
          }
          //下面的代碼用于動態(tài)顯示字符的，主要的東西在上面
          void moveLeftOneStep(void)//左右移動
          {
          if(cursorPosition==0)//表明要通過翻頁左移
          {
          if(startAddress!=0)//表明還可左移一次 剩下情況沒法移動
          {
          startAddress--;//確定顯示的結(jié)束位置
          if(expressLength-startAddress>=16)//表明顯示滿了
          {
          endAddress=startAddress+15;
          return;
          }
          else//表明后面還有幾個空要填滿
          { 
          endAddress=expressLength-1;
          }
          }
          }
          else//表明無需翻頁
          {
          cursorPosition--;
          }
          }
          void moveRightOneStep(void)
          {
          if(startAddress+cursorPosition==endAddress+1)
          return;
          if(cursorPosition==15)//表明要考慮是否進(jìn)行翻頁
          {
          if(startAddress+16
          //表明 startAddress+15得到的是LCD最后一位對應(yīng)express的地址 再加1表示長度
          {
          startAddress++;
          endAddress=startAddress+15;
          displayExpress();
          }
          else if(startAddress+16==expressLength)//表明當(dāng)前已是最后一個字符
          {
          startAddress++;
          endAddress=startAddress+14;//光標(biāo)處應(yīng)該是空
          displayExpress();
          }
          else//表明光標(biāo)處并沒有顯示字符
          {
          return;
          }
          }
          else//表明無需翻頁
          {
          if(cursorPosition==endAddress+1)//已到最后一個位置，光標(biāo)不能再動了
          {
          return;
          }
          cursorPosition++;
          endAddress=expressLength-1;
          setCursorPosition(cursorPosition);
          }
          }
          void moveLeft(void)//startAddress+cursorPosition是光標(biāo)對應(yīng)express中的地址
          {
          if(startAddress+cursorPosition==0)//跳轉(zhuǎn)到最后
          {
          if(expressLength>15)
          {
          endAddress=expressLength-1;
          startAddress=endAddress-14;
          }
          cursorPosition=endAddress-startAddress+2;
          }
          if(startAddress+cursorPosition-1>=0&&express[startAddress+cursorPosition-1]==n)//tan,sin,ln
          {
          if(startAddress+cursorPosition-6>=0&&express[startAddress+cursorPosition-6]==a&&express[startAddress+cursorPosition-6+1]==r) //arctan,arcsin……
          {
          moveLeftOneStep();
          moveLeftOneStep();
          moveLeftOneStep();
          moveLeftOneStep();
          moveLeftOneStep();
          moveLeftOneStep();
          }
          else if(express[startAddress+cursorPosition-2]==l)//表明為ln
          {
          moveLeftOneStep();
          moveLeftOneStep();
          }
          else //表明為sin或tan
          {
          moveLeftOneStep();
          moveLeftOneStep();
          moveLeftOneStep();
          }
          }
          else if(startAddress+cursorPosition-1>=0&&startAddress+cursorPosition-1>=0&&express[startAddress+cursorPosition-1]==g)//lg
          {
          moveLeftOneStep();
          moveLeftOneStep();
          }
          else if(startAddress+cursorPosition-1>=0&&express[startAddress+cursorPosition-1]==s)
          {
          if(startAddress+cursorPosition-6>=0&&express[startAddress+cursorPosition-6]==a&&express[startAddress+cursorPosition-6+1]==r) //arctan,arcsin……
          {
          moveLeftOneStep();
          moveLeftOneStep();
          moveLeftOneStep();
          moveLeftOneStep();
          moveLeftOneStep();
          moveLeftOneStep();
          }
          else
          {
          moveLeftOneStep();
          moveLeftOneStep();
          moveLeftOneStep();
          }
          }
          else//表明為單個字符
          {
          moveLeftOneStep();
          }
          }
          void moveRight(void)
          {
          if(endAddress-startAddress+1==cursorPosition)//表明光標(biāo)到了最后
          { 
          if(expressLength>15)
          {
          endAddress=15;
          startAddress=0;
          }
          cursorPosition=0;
          }
          else if(express[startAddress+cursorPosition]==s||express[startAddress+cursorPosition]==t||express[startAddress+cursorPosition]==c)//sin,tan
          {
          moveRightOneStep();
          moveRightOneStep();
          moveRightOneStep();
          }
          else if(express[startAddress+cursorPosition]==a)//arctan,arcsin之類的
          {
          moveRightOneStep();
          moveRightOneStep();
          moveRightOneStep();
          moveRightOneStep();
          moveRightOneStep();
          moveRightOneStep();
          }
          else if(express[startAddress+cursorPosition]==l)//lg,ln
          {
          moveRightOneStep();
          moveRightOneStep();
          }
          else//表明為單字符
          moveRightOneStep();
          }
          void displayExpress(void)//從startAddress顯示到endAddress
          {
          char i;
          write_position(0x80);//從這里開始顯示
          for(i=startAddress;i<=endAddress;i++)
          {
          write_data(express[i]);
          }
          for(i=endAddress+1;i<16+startAddress;i++)//后面的寫空格
          {
          write_data( );
          }
          }
          void insertOneAndDisplay(void)
          {
          expressLength++;
          if(cursorPosition>=0&&cursorPosition<15)//表明是在和前面當(dāng)中插入的 startAddress可以不變
          {
          //查看當(dāng)前顯示狀態(tài)
          if(endAddress-startAddress==15)//表明當(dāng)前已經(jīng)滿顯了
          {
          endAddress--;
          }
          else//表明未滿顯
          {
          endAddress++;
          }
          cursorPosition++;
          }
          else if(cursorPosition==15)//表明光標(biāo)在顯示器第16個顯示單元處 此時 startAddress得變 
          {
          if(endAddress-startAddress==15)//表明當(dāng)前已經(jīng)滿顯未滿顯的情況已在isModifyInput中處理
          {
          startAddress++;
          endAddress++;
          }
          }
          }
          void deleteOneAndDisplay(void)
          {
          moveExpressForward(cursorPosition+startAddress,1);
          expressLength--;
          if(cursorPosition==0)
          {
          startAddress--;
          //確定endAddress的位置
          if(expressLength-startAddress>=16)//表明顯示滿了
          {
          endAddress=startAddress+15;
          }
          else//表明后面還有幾個空要填滿
          {
          endAddress=expressLength-1;
          }
          }
          else
          {
          cursorPosition--;//光標(biāo)位置要--
           //確定endAddress的位置
          if(expressLength-startAddress>=16)//表明顯示滿了
          {
          endAddress=startAddress+15;
          }
          else//表明后面還有幾個空要填滿
          {
          endAddress=expressLength-1;
          }
          }
          }
          void deleteAndDisplay(void)
          {
          if(startAddress==0&&cursorPosition==0)//表明沒法刪除了
          {
          return;
          }
          if(express[cursorPosition-1+startAddress]==s)//表明為cos
          {
          if(cursorPosition-6+startAddress>=0&&express[cursorPosition-6+startAddress]==a)
          {
          deleteOneAndDisplay();
          deleteOneAndDisplay();
          deleteOneAndDisplay();
          deleteOneAndDisplay();
          deleteOneAndDisplay();
          deleteOneAndDisplay();
          }
          else
          {
          deleteOneAndDisplay();
          deleteOneAndDisplay();
          deleteOneAndDisplay();
          }
          }
          else if(express[cursorPosition-1+startAddress]==n)//表明為sin tan 或者ln
          {
          if(express[cursorPosition-2+startAddress]==l)//表明為ln
          {
          deleteOneAndDisplay();
          deleteOneAndDisplay();
          }
           else if(cursorPosition-6+startAddress>=0&&express[cursorPosition-6+startAddress]==a)//表明為arcsin或者acrtan運(yùn)算
          {
          deleteOneAndDisplay();
          deleteOneAndDisplay();
          deleteOneAndDisplay();
          deleteOneAndDisplay();
          deleteOneAndDisplay();
          deleteOneAndDisplay();
          }
          else//表明為sin、tan
          {
          deleteOneAndDisplay();
          deleteOneAndDisplay();
          deleteOneAndDisplay();
          }
          }
          else if(express[cursorPosition-1+startAddress]==g)
          {
          deleteOneAndDisplay();
          deleteOneAndDisplay();
          }
          else//表明刪除一個
          {
          deleteOneAndDisplay();
          }
          }
          void displayInputExpress(void)//輸入時調(diào)用的
          {
          if(keyCode===)
          {
          return;
          }
          if(cursorPosition==15&&startAddress+1<=100)
          {
          startAddress++;
          endAddress=14+startAddress;
          return;
          }
          else //僅能提供第一次輸入時的顯示
          {
          endAddress=expressLength-1;
          cursorPosition++;
          return;
          }
          warning("error 1");
          }
          void displayModifyExpress(void)
          {
          if(keyCode===)
          {
          return;
          }
          if(keyCode==129||keyCode==130||keyCode==131)//表明為三個字符要輸入
          {
          insertOneAndDisplay();
          insertOneAndDisplay();
          insertOneAndDisplay();
          }
          else if(keyCode==139||keyCode==140)
          {
          insertOneAndDisplay();
          insertOneAndDisplay();
          }
          else if(keyCode>=141&&keyCode<=142)
          {
          insertOneAndDisplay();
          insertOneAndDisplay();
          insertOneAndDisplay();
          insertOneAndDisplay();
          insertOneAndDisplay();
          insertOneAndDisplay();
          }
          else
          {
          insertOneAndDisplay();
          }
          }
          void dispaly_dataA(void);
          void dispaly_dataA(void)
          {
          if(dataA>=pow(10,36))
          {
          warning("Answer Over Flow!");
          dataA=0;
          dispaly_dataA();
          }
          else
          {
          sprintf(LCDBuffer,"g",dataA);
          loadAndDisplay(1);
          }
          }
          void warning(char *p)
          {
          sprintf(LCDBuffer,"s",p);
          loadAndDisplay(0);
          delayms(500);
          sprintf(LCDBuffer,"s"," ");//清屏
          loadAndDisplay(0);
          displayExpress();
          }
          void moveLogo(void)//把字符向前移動
          {
           unsigned char i,temp;
          temp=LCDBuffer[0];
          for(i=0;i<15;i++)
          {
          LCDBuffer[i]= LCDBuffer[i+1];//前移動
          }
          LCDBuffer[15]=temp;
          }
          void showLogo(void)
          {
           char i;
           strcpy(LCDBuffer,"  HuaQiang_PCB");//上次參加比賽時用的Logo
          for(i=0;i<19;i++)
          {
          loadAndDisplay(0);
          moveLogo();
          delayms(100);
          }
          }
          
				
            
                
			
							
          
                
			              
              
            
          
		
          
		
          
		
          
		
          
		
          
			
            
				
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            			            1602LCD顯示
                        
            
          
            
			
          
		
          	
		

	

          
	
	
          
		
          
			
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