电压表.c

电压表液晶显示

//////////测0~5V的电压表////////////
#include<reg52.h>
#define uchar unsigned char
#define uint unsigned int
#define outport P1
sbit start=P3^4;
sbit EOC=P3^5;//转换结束
sbit E=P3^0;  
sbit RS=P3^7; 
sbit RW=P3^6;
uchar wan,qian,bai,shi,ge;
uchar code table[]="0123456789.v";
uchar code table1[]="dis:";
uchar code table2[]="   voltmeter";
uchar num;
long out;
float k;
void delay(uint z)//延时1ms
{
  uint i,j;
  for(i=z;i>0;i--)
    for(j=110;j>0;j--);
}
void write_com(uchar com) //写指令
{
   RS=0;
   P0=com;
   delay(5);
   E=1;
   delay(5);
   E=0;  
}
void write_data(uchar date)//写数据
{
   RS=1;
   P0=date;
   delay(5);
   E=1;
   delay(5);
   E=0;
}
/*void ADC() //AD转换
{
   start=1;
   start=0;
   while(EOC==0);//AD转换结束标志
   out=outport;
  // out=0.123;
   out=(out*100)/51;//数据处理
}*/
void init()
{
   E=0;
   write_com(0x38);//设置16*2显示，5*7点阵，8位数据接口
   write_com(0x0c);//设置开显示，不显示光标
   write_com(0x01);//显示清0，数据指针清0
}
void main()
{
   uchar i;
   init();
   
   while(1)
   {
    // ADC();    //AD转换
     k=0.123;
     out=k*100;
     wan=out/10000;
     qian=out%10000/1000;
     bai=out%1000/100;
     shi=out%100/10;
     ge=out%10;
     write_com(0x80);
     for(i=0;i<13;i++)
     write_data(table2[i]);
     write_com(0x80+0x40);
     for(i=0;i<6;i++)
     write_data(table1[i]);
     write_data(table[wan]);
     write_data(table[qian]);
     write_data(table[bai]);
     write_data(table[10]);
     write_data(table[shi]);
     write_data(table[ge]);
     write_data(table[11]); 
   }
}