12864显示温度曲线使用18B20温度传感器

ID:402943 · 发表于 2018-9-27 00:08

程序代码如下：

#include <reg51.h>
#include <intrins.h>
#include <math.h>
#define uint unsigned int
#define uchar unsigned char

sbit rs=P3^5;    /*数据\指令选择*/
sbit rw=P3^6;    /*读\写选择*/
sbit e=P3^4;    /*读\写使能*/
sbit ds=P2^2;    //18B20信号脚
sbit PSB = P3^7;
sbit WE = P2^6;
sbit DU = P2^7;

uint temp;
float ftemp;
uchar code table[]="0123456789.度";

void writecom(uchar com);
void writedat(uchar dat);
void initinal(void);

//12MHZ晶振延时50微秒
void delay50us(uint t)
{
uchar j;
for(;t>0;t--)
for(j=19;j>0;j--);
}
void dsreset()    // ds18b20初始化函数
{
   uint i;
   ds=0;       //拉低总线开始复位
   i=103;
   while(i>0)i--;
   ds=1;//释放总线
   i=4;
   while(i>0)i--;
// 省去了等待芯片返回应答的过程。。。。。。
}
bit readbit(void)    //ds18b20读取一个二进制位，参照时序图
{
  uint i;
  bit dat;
  ds=0;i++;
  ds=1;i++,i++;
  dat=ds;
  i=8;while(i>0)i--;
  return(dat);
}
uchar tempread(void)  //ds18b20读取一个字节的数据
{
  uchar i,j,dat;
  dat=0;
  for(i=0;i<8;i++)
  {
   j=readbit();
   dat=(j<<7)|(dat>>1);  //
  }
  return(dat);
}
void tempwrite(uchar dat) //ds18b20写入字节数据
{
uint i;uchar j;
bit testb;
for(j=1;j<=8;j++)
{
testb=dat&0x01;
dat=dat>>1;
if(testb==1)    // 写1
{
   ds=0;          //    拉低总线以开始一个写时序
   i++;i++;
   ds=1;          //    释放总线
   i=8;while(i>0)i--;
}
else                   // 写0
{
      ds=0;
   i=8;while(i>0)i--;
   ds=1;
   i++;i++;
}
}
}
void tempchang(void) //温度转换
{
dsreset();
delay50us(20);
tempwrite(0xcc);    //
tempwrite(0x44);    //
}
uint gettemp()    // 获取温度
{
  uchar a,b;
  dsreset();
  delay50us(2000);       //延时100毫秒消除恐怖85度
  tempwrite(0xcc);    //
  tempwrite(0xbe);    //
  a=tempread();       //
  b=tempread();          //
  temp=b;
  temp<<=8;    //////
  temp=temp|a;
  ftemp=temp*0.0625;    //
  temp=ftemp*10+0.5;       //
  ftemp=ftemp+0.05;          //
  return temp;             //
}

/*------------------检查忙位-----------------------------*/
void chkbusy()
{
rs=0;
rw=1;
e=1;
P0=0xff ;
while((P0&0x80)==0x80);
e=0;
}
/*************读数据************/
uchar read()
{
uchar shuju;
chkbusy();
P0=0xff;
rs=1;
rw=1;
e=0;
delay50us(1);
e=1;
shuju=P0;
// delay(5);
e=0;
return(shuju);
}
//增加画点子程序
void DrawPoint(uchar X,uchar Y,uchar Color)
{
uchar Row,Tier,Tier_bit ;
uchar ReadOldH,ReadOldL ;
//writecom(0x34); //扩展指令开
writecom(0x36);       //扩展指令加绘图模块
Tier=X>>4 ;
Tier_bit=X&0x0f ;
if(Y<32)
{
      Row=Y ;
}
else
{
      Row=Y-32 ;
      Tier+=8 ;
}
writecom(Row+0x80);
writecom(Tier+0x80);
read();
ReadOldH=read();
ReadOldL=read();
writecom(Row+0x80);
writecom(Tier+0x80);
if(Tier_bit<8)
{
      switch(Color)
      {
         case 0 :
         ReadOldH&=(~(0x01<<(7-Tier_bit)));
         break ;
         case 1 :
         ReadOldH|=(0x01<<(7-Tier_bit));
         break ;
         case 2 :
         ReadOldH^=(0x01<<(7-Tier_bit));
         break ;
         default :
         break ;
      }
      writedat(ReadOldH);
      writedat(ReadOldL);
}
else
{
      switch(Color)
      {
         case 0 :
         ReadOldL&=(~(0x01<<(15-Tier_bit)));
         break ;
         case 1 :
         ReadOldL|=(0x01<<(15-Tier_bit));
         break ;
         case 2 :
         ReadOldL^=(0x01<<(15-Tier_bit));
         break ;
         default :
         break ;
      }
      writedat(ReadOldH);
      writedat(ReadOldL);
}
writecom(0x30);
}
//写命令
void writecom(uchar com)
{
  chkbusy();
  rw=0;
  rs=0;
  delay50us(1);
  P0=com;
  e=1;
  delay50us(10);
  e=0;
  delay50us(10);
}

//写数据
void writedat(uchar dat)
{
  chkbusy();
  rw=0;
  rs=1;
  delay50us(1);
  P0=dat;
  e=1;
  delay50us(10);
  e=0;
  delay50us(10);
}

//初始化
void initinal(void)
{
  delay50us(2);
  writecom(0x30);
  delay50us(4);
  writecom(0x30);
  delay50us(4);
  writecom(0x0e);
  delay50us(4);
  writecom(0x01);
  delay50us(240);
  writecom(0x06);
  delay50us(10);
}
void clrscreen()
{
writecom(0x01);
delay50us(10);
}
//------------------清整个GDRAM空间----------------------------
void clrgdram()
{
unsigned char x,y ;
for(y=0;y<64;y++)
for(x=0;x<16;x++)
{
      writecom(0x34);
      writecom(y+0x80);
      //行地址
      writecom(x+0x80);
      //列地址
      writecom(0x30);
      writedat(0x00);
      writedat(0x00);
}
}
//------------------------------------------------------------
  //主函数
void main()
{
uchar i,j,e,colour=1;
// uint a ;
   rw=0;
WE = DU = 0;
initinal();
clrgdram();
  //  delay50us(2);
clrscreen();
// writecom(0x34);


while(1)
{
   uint a,b,c,d;
   DrawPoint(18,6,colour);
   DrawPoint(18,22,colour);
   DrawPoint(18,38,colour);
   DrawPoint(18,54,colour);
      for(j=17;j<128;j++)
{

      DrawPoint(17,j-17,colour);
      DrawPoint(j,63,colour);
      writecom(0x80);
      writedat(table[6]);
      writedat(table[7]);
      writecom(0x90);
      writedat(table[5]);
      writedat(table[1]);
      writecom(0x88);
      writedat(table[3]);
      writedat(table[5]);
      writecom(0x98);
      writedat(table[1]);
      writedat(table[9]);
}

for(i=17;i<128;i++)
{
   tempchang();
   a=gettemp();
   delay50us(1000);
   e=73-a/10;
   DrawPoint(i,e,colour);

      b=a/100;
   c=a%100/10;
   d=a%100%10;
   writecom(0x83);
   writedat(table[b]);
   delay50us(1);
   writedat(table[c]);
   delay50us(1);
   writedat(table[10]);
   delay50us(1);
   writedat(table[d]);
   delay50us(1);
   writedat(table[11]);
   writedat(table[12]);
   delay50us(4);
   writecom(0x83);
}
clrgdram();
/* writecom(0x36);
delay50us(5);
clrgdram();
clrscreen();
   tempchang();
   a=gettemp();
                     */
}

}

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