1602LCD显示器的使用

LCDE==P2.7    LCD使能

DB==P0        数据位
RD==P2.6      写模式选择
WR==P2.5      读写使能

指令码：                 二进制           十六进制

清屏：                10000000             0x80;

光标归位:             X1000000             0x40或0xC0

。。。。。。。。

读状态输入：RS=L，RW=H，E=H 输出：DB0～DB7=状态字
写指令输入：RS=L，RW=L，E=下降沿脉冲，DB0～DB7=指令码输出：无
读数据输入：RS=H，RW=H，E=H 输出：DB0～DB7=数据
写数据输入：RS=H，RW=L，E=下降沿脉冲，DB0～DB7=数据输出：无

上次写的驱动：

#include

#include'LCD1602.h'

#include

#include

#include

#include

#include

sbit lcdrs =P3^0;//数据/命令选择端（H/L）

sbit lcdrw =P3^1;//读/写选择端（H/L）

sbit lcden =P3^2;//使能信号端

char  theDisplayLength=0,//保存应该在当前显示的位数

 cursorPosition=0;//保存光标所在显示屏的位置

char  startAddress=0,endAddress=0;//保存显示的起始和结束地址

 

char LCDBuffer[16]={''}; 

char ctrlStr[7]={'.4f'};

 

void delayms(int xms)   //延时X毫秒

{

int i, j;

for(i=xms;i>0;i--)

for(j=121;j>0;j--);

}  

void write_com(char com)//写命令

{

lcdrs=0;

P0=com;

delayms(1);

lcden=1;

delayms(1);

lcden=0;   

}

 

void write_data(char mydata)////写数据

{

lcdrs=1;

P0=mydata;

delayms(1);

lcden=1;

delayms(1);

lcden=0;   

}

void initLCD()//初始化

{

   lcdrw=0;

   lcden=0;

   write_com(0x38); //设置16x2显示，5x7点阵，8位数据接口

   write_com(0x0e); //00001dcb,d=1开显示，c=1显示光标，b=1光标闪烁

   write_com(0x06); //000001ns,n=1字符后地址指针加一，且光标加                         

    //s=1写字符，正屏显示左移（n=1）

   write_com(0x80); //设置数据地址指针(0-27H,40-67H)

   write_com(0x01); //01,显示清屏：1，数据指针清零。2，所有显示清零

//02,显示回车：1，数据指针清零。

   startAddress=0;

   endAddress=-1;

}

void write_position(char position)//字符要显示在LCD哪个位置

{

lcdrs=0;

lcdrw=0;

lcden=0;

P0=position;

delayms(1);

lcden=1;

delayms(1);

lcden=0;

}

 

///功能函数部分

void displayOneCharacter(char mydata,char position)

{

write_position(position);

write_data(mydata);

}

 

void loadAndDisplay(bit judge)

{

if(judge==0)

{

   //显示上面的16个字符

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)

{

   //显示下面的16个字符

   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) //移动光标位置

{

  char i;

write_com(0x02);//光标归位

for(i=0;i

    {

write_com(0x14);//右移

    }

}

 

//下面的代码用于动态显示字符的，主要的东西在上面

void moveLeftOneStep(void)//左右移动

{

if(cursorPosition==0)//表明要通过翻页左移

{

if(startAddress!=0)//表明还可左移一次 剩下情况没法移动

{

startAddress--;//确定显示的结束位置

if(expressLength-startAddress>=16)//表明显示满了

{

endAddress=startAddress+15;

return;

}

else//表明后面还有几个空要填满

{  

endAddress=expressLength-1;

}

}

} 

else//表明无需翻页

{

cursorPosition--;

}

}

 

void moveRightOneStep(void)

{

if(startAddress+cursorPosition==endAddress+1)

return;

if(cursorPosition==15)//表明要考虑是否进行翻页

{

if(startAddress+16

//表明 startAddress+15得到的是LCD最后一位对应express的地址 再加1表示长度

{

startAddress++;

endAddress=startAddress+15;

displayExpress();

}

else if(startAddress+16==expressLength)//表明当前已是最后一个字符

{

startAddress++;

endAddress=startAddress+14;//光标处应该是空

displayExpress();

}

else//表明光标处并没有显示字符

{

return;

}

}

else//表明无需翻页

{

if(cursorPosition==endAddress+1)//已到最后一个位置，光标不能再动了

{

return;

}

cursorPosition++;

endAddress=expressLength-1;

setCursorPosition(cursorPosition);

}

}

 

void moveLeft(void)//startAddress+cursorPosition是光标对应express中的地址

{

if(startAddress+cursorPosition==0)//跳转到最后

{

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')//表明为ln

{

moveLeftOneStep();

moveLeftOneStep();

}

else //表明为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//表明为单个字符

{

moveLeftOneStep();

}

}

 

void moveRight(void)

{

if(endAddress-startAddress+1==cursorPosition)//表明光标到了最后

{  

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之类的

{

moveRightOneStep();

moveRightOneStep();

moveRightOneStep();

moveRightOneStep();

moveRightOneStep();

moveRightOneStep();

}

else if(express[startAddress+cursorPosition]=='l')//lg,ln

{

moveRightOneStep();

moveRightOneStep();

}

else//表明为单字符

moveRightOneStep();

}

 

void displayExpress(void)//从startAddress显示到endAddress

{

char i;

write_position(0x80);//从这里开始显示

for(i=startAddress;i<=endAddress;i++)

{

write_data(express[i]);

}

for(i=endAddress+1;i<16+startAddress;i++)//后面的写空格

{

write_data(' ');

}

}

 

void insertOneAndDisplay(void)

{

expressLength++;

if(cursorPosition>=0&&cursorPosition<15)//表明是在和前面当中插入的  startAddress可以不变

{

//查看当前显示状态

if(endAddress-startAddress==15)//表明当前已经满显了

{

endAddress--;

}

else//表明未满显

{

endAddress++;

}

cursorPosition++;

}

else if(cursorPosition==15)//表明光标在显示器第16个显示单元处 此时 startAddress得变  

{

if(endAddress-startAddress==15)//表明当前已经满显未满显的情况已在isModifyInput中处理

{

startAddress++;

endAddress++;

}

}

}

 

 

void deleteOneAndDisplay(void)

{

moveExpressForward(cursorPosition+startAddress,1);

expressLength--;

if(cursorPosition==0)

{

startAddress--;

//确定endAddress的位置

if(expressLength-startAddress>=16)//表明显示满了

{

endAddress=startAddress+15;

}

else//表明后面还有几个空要填满

{

endAddress=expressLength-1;

}

}

else

{

cursorPosition--;//光标位置要--

   //确定endAddress的位置

if(expressLength-startAddress>=16)//表明显示满了

{

endAddress=startAddress+15;

}

else//表明后面还有几个空要填满

{

endAddress=expressLength-1;

}

}

}

 

void deleteAndDisplay(void)

{

if(startAddress==0&&cursorPosition==0)//表明没法删除了

{

return;

}

if(express[cursorPosition-1+startAddress]=='s')//表明为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')//表明为sin tan  或者ln

{

if(express[cursorPosition-2+startAddress]=='l')//表明为ln

{

deleteOneAndDisplay();

deleteOneAndDisplay();

}

  else if(cursorPosition-6+startAddress>=0&&express[cursorPosition-6+startAddress]=='a')//表明为arcsin或者acrtan运算

{

deleteOneAndDisplay();

deleteOneAndDisplay();

deleteOneAndDisplay();

deleteOneAndDisplay();

deleteOneAndDisplay();

deleteOneAndDisplay();

}

else//表明为sin、tan

{

deleteOneAndDisplay();

deleteOneAndDisplay();

deleteOneAndDisplay();

} 

}

else if(express[cursorPosition-1+startAddress]=='g')

{

deleteOneAndDisplay();

deleteOneAndDisplay();

}

else//表明删除一个

{

deleteOneAndDisplay();

}

}

 

void displayInputExpress(void)//输入时调用的

{

if(keyCode=='=')

{

return;

}

if(cursorPosition==15&&startAddress+1<=100)

{

startAddress++;

endAddress=14+startAddress;

return;

}

else //仅能提供第一次输入时的显示

{

endAddress=expressLength-1;

cursorPosition++;

return;

}

warning('error 1');

}

 

 

void displayModifyExpress(void)

{

if(keyCode=='=')

{

return;

}

if(keyCode==129||keyCode==130||keyCode==131)//表明为三个字符要输入

{

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)//把字符向前移动

{

  unsigned char i,temp;

temp=LCDBuffer[0];

for(i=0;i<15;i++)

{

LCDBuffer[i]= LCDBuffer[i+1];//前移动

}

LCDBuffer[15]=temp;

}

 

void showLogo(void)

{

  char i;

  strcpy(LCDBuffer,'    HuaQiang_PCB');//上次参加比赛时用的Logo

for(i=0;i<19;i++)

{

loadAndDisplay(0);

moveLogo();

delayms(100);

}

}