ds18b20源码.c

准确

#include<reg51.h>
#include <intrins.h>
#define BYTE unsigned char
#define WORD unsigned int

sbit ZLG7289_CS = P1^2;
sbit ZLG7289_CLK = P1^1;
sbit ZLG7289_DIO = P1^0;
sbit KEY = P3^3;

sbit DQ =P1^3;   //定义通信端口
unsigned char SN[2][9]={{0x28,0xe3,0x1c,0x43,0x00,0x00,0x00,0x5b},{0x28,0xb2,0x1b,0x43,0x00,0x00,0x00,0x13}};
unsigned int way=0;//第一路或第二路
void delay(unsigned int i)
{
 while(i--);
}

Init_DS18B20(void)
{
 unsigned char x=0;
 DQ = 1;    //DQ复位
 delay(8);  //稍做延时
 DQ = 0;    //单片机将DQ拉低
 delay(80); //精确延时 大于 480us
 DQ = 1;    //拉高总线
 delay(14);
 x=DQ;      //稍做延时后 如果x=0则初始化成功 x=1则初始化失败
 delay(20);
}

//读一个字节
rbyte(void)
{
unsigned char i=0;
unsigned char dat = 0;
for (i=8;i>0;i--)
 {
  DQ = 0; // 给脉冲信号
  dat>>=1;
  DQ = 1; // 给脉冲信号
  if(DQ)
   dat|=0x80;
  delay(4);
 }
 return(dat);
}

//写一个字节
wbyte(unsigned char dat)
{
 unsigned char i=0;
 for (i=8; i>0; i--)
 {
  DQ = 0;
  DQ = dat&0x01;
  delay(5);
  DQ = 1;
  dat>>=1;
 }
}

//读取温度
ReadTemperature(void)
{
unsigned char low=0;
unsigned char high=0;
unsigned int tee=0;
unsigned int i;

Init_DS18B20();
wbyte(0xCC); // 跳过读序号列号的操作
wbyte(0x44); // 启动温度转换



Init_DS18B20();
wbyte(0x55); //匹配ROM
for(i=0;i<8;i++)
{
wbyte(SN[way][i]); //发送序列号
}


wbyte(0xBE); //读取温度寄存器等（共可读9个寄存器） 前两个就是温度
low=rbyte();
high=rbyte();


tee=high;
tee=tee<<8;
tee=tee|low;

return(tee);
}

void delay_short() // 短延时函数
{
BYTE j;
for(j=0;j<10;j++);
}


void delay_long() // 长延时函数
{
int j;
for(j=0;j<80;j++);
}

void dis_play(BYTE aa) // 写指令和写数据函数
{
 BYTE i;
 for(i=0;i<8;i++)
      {
      if(_crol_(aa,i)&0x80)
      ZLG7289_DIO = 1;
      else ZLG7289_DIO = 0;
      ZLG7289_CLK = 1;
      delay_short();
      ZLG7289_CLK = 0;
      }
}

unsigned char GetKeyNumber(void)
{
        unsigned char i,keyValue=0;
        unsigned char keys[8];
        dis_play(0x15);
        for(i=0;i<8;i++)
        {
                ZLG7289_CLK=1;//triggle a rising edge
                delay_short();
                ZLG7289_CLK=0;
                keys[i]=ZLG7289_DIO;
                keyValue=keyValue*2+keys[i];
        }
        ZLG7289_CS=1;
        return keyValue;
}



char KeyProjection(unsigned char keyValue) //键值映射
{
        switch (keyValue)
        {
                case 0x30:{return 0x0e; break;}
                case 0x31:{return 0x0c; break;}
                case 0x32:{return 0x0a; break;}
                case 0x33:{return 0x09; break;}
                case 0x34:{return 0x07; break;}
                case 0x35:{return 0x05; break;}
                case 0x36:{return 0x03; break;}
                case 0x37:{return 0x01; break;}
                case 0x38:{return 0x0f; break;}
                case 0x39:{return 0x0d; break;}
                case 0x3a:{return 0x0b; break;}
                case 0x3b:{return 0x00; break;}
                case 0x3c:{return 0x08; break;}
                case 0x3d:{return 0x06; break;}
                case 0x3e:{return 0x04; break;}
                case 0x3f:{return 0x02; break;}
                default: return 0xff;
         }
}



void show(unsigned int temp) // 显示函数
{
BYTE string[16] = {0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0A,0x0B,0x0C,0x0D,0x0E,0x0F};
// 按方式0译码时：对应显示0-9数字和"-,E,H,L,P,空(无显示)"
// 按方式1译码时：对应显示0-9数字和A-F字符
BYTE symbol = 0xFF;
BYTE i;
BYTE t;//温度显示变量
float t1;
t1=(float)temp/16;//转化成浮点
P1 = 0x00;

KEY = 1;  //原值是一
ZLG7289_CS = 0;
ZLG7289_CLK = 0;
delay_short();
dis_play(0xA4); // 复位指令
ZLG7289_CS = 1;
delay_long();

        ZLG7289_CS = 0; // 选择驱动第5个数码管显示
         delay_short();
         dis_play(0x87-3);
         delay_short();
         t=(char)t1/10;
         dis_play(string[t]);      //***初值修改处***
         ZLG7289_CS = 1;
         delay_long();
         delay_long();

              ZLG7289_CS = 0; // 选择驱动第6个数码管显示
              delay_short();
              dis_play(0x87-2);
               delay_short();
               t=(char)t1%10;
              dis_play(string[t]|0x80);    //或0x80是添加小数点
              ZLG7289_CS = 1;
              delay_long();
              delay_long();
              delay_long();

         ZLG7289_CS = 0; // 选择驱动第7个数码管显示
         delay_short();
         dis_play(0x87-1);
         delay_short();
         t1=t1*10; //选出小数部分
         t=(long)t1%10;
         dis_play(string[t]);      //***初值修改处***
         ZLG7289_CS = 1;
         delay_long();
         delay_long();

              ZLG7289_CS = 0; // 选择驱动第8个数码管显示
              delay_short();
              dis_play(0x87-0);
              delay_short();
              t1=t1*10; //选出小数部分
              t=(long)t1%10;
              dis_play(string[t]);
              ZLG7289_CS = 1;
              delay_long();
              delay_long();
              delay_long();
}

main()
{
 unsigned int temp;
 EX1=1;
 EA=1;
  while(1)
  {
   temp=ReadTemperature();//读温度
   show(temp);
  }


}

void WaitingForCommand(void) interrupt 2
{       int i;
        BYTE string[16] = {0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0A,0x0B,0x0C,0x0D,0x0E,0x0F};
        char keyNumber=0x0f;
        ZLG7289_CS=0;
        keyNumber=GetKeyNumber();
        ZLG7289_CS=1;
        keyNumber=KeyProjection(keyNumber);

        switch (keyNumber)
        {

                case 0x0d:
                {       way=0;
                        i=1000;
                        ZLG7289_CS = 0;
                        ZLG7289_CLK = 0;
                        delay_short();
                        dis_play(0xA4); // 复位指令
                        ZLG7289_CS = 1;
                        delay_long();
                        ZLG7289_CS = 0; // 选择驱动第8个数码管显示
                        delay_short();
                        dis_play(0x87-0);
                        delay_short();

                        dis_play(string[1]);
                        ZLG7289_CS = 1;
                        while(i>0)
                        {
                        delay_long();
                        i--;
                        }
                       break;
                }
                case 0x0c:
                {       way=1;
                        i=1000;
                        ZLG7289_CS = 0;
                        ZLG7289_CLK = 0;
                        delay_short();
                        dis_play(0xA4); // 复位指令
                        ZLG7289_CS = 1;
                        delay_long();
                        ZLG7289_CS = 0; // 选择驱动第8个数码管显示
                        delay_short();
                        dis_play(0x87-0);
                        delay_short();

                        dis_play(string[2]);
                        ZLG7289_CS = 1;
                        while(i>0)
                        {
                        delay_long();
                        i--;
                        }
                       break;
                }

                default: break;
         }
}