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#include<reg51.h> #include<intrins.h> #include <string.h> #include <stdio.h> #define uchar unsigned char #define uint unsigned int sbit RS= P2^0 ; //液晶显示引脚定义 sbit RW= P2^1 ; sbit EN= P2^2 ; uint t=0,dian=0; uchar LCD_LINE_ONE[16]={"tp1: "}; //定义显示屏幕 uchar LCD_LINE_TWO[16]={"tp2: "}; //uchar LCD_LINE_THR[16]={" "}; int Tm; int fushu=0 ; sbit DQ= P3^3; static unsigned char get_serial[]={ //获取的八个DS18B20内部RAM64位序列号 224, 0,0,0, 184, 197, 50, 40, 215, 0,0,0, 184, 197, 51, 40 // 82, 0,0,0, 184, 197, 52, 40 // 101, 0,0,0, 184, 197, 53,40, //60, 0,0,0, 184, 197, 54,40, //11, 0,0,0, 184, 197, 55,40, //47, 0,0,0, 184, 197, 56,40, //185, 0,0,0, 184, 197, 49,40, }; void delay( ms ) //用于液晶显示的延时函数 { int i ; while(ms--) { for(i=0 ;i<5 ;i++ ) ; } } uchar Read_LCD_State() //读取液晶显示的状态 { uchar state; RS=0;RW=1;EN=1;delay(1); state=P0; EN = 0;delay(1); return state; } void LCD_Busy_Wait() //如果忙则等待函数 { while((Read_LCD_State()&0x80)==0x80); delay(5); } void Write_LCD_Zhilin(uchar zl) //液晶显示写指令函数 { LCD_Busy_Wait(); RS=0;RW=0; EN=0; P0=zl; EN=1; delay(1); EN=0; } void Write_LCD_shuju(uchar date) //液晶显示写数据函数 { LCD_Busy_Wait(); RS=1;RW=0; EN=0; P0=date; EN=1; delay(1); EN=0; } void LCD_INIT() //液晶显示初始化 { Write_LCD_Zhilin(0x38); // 显示模式设置 delay(1); Write_LCD_Zhilin(0x01); // 显示清屏 delay(1); Write_LCD_Zhilin(0x06); // 光标移动设置 delay(1); Write_LCD_Zhilin(0x0c); // 开及光标设置 delay(1); } void Display_LCD_String(uchar p,uchar *s) //液晶显示写入函数 { uchar i; Write_LCD_Zhilin(p|0x80) ; //写地址高位为一 //Write_LCD_Zhilin(0x40|0x80) ; for(i=0;i<16;i++) { Write_LCD_shuju(s[i]); delay(1); } } /***************************************************************************************/ void delays(int us) //用于DS18B20的延时函数 { int s; for ( s=0; s<us; s++); } void rst(void) //DS18B20初始化 { DQ = 1; delays(2); DQ = 0; delays(30); //精确延时 480~960us DQ = 1; delays(8); } void write(unsigned char ku) //DS18B20写函数 { int i=0; for (i=0;i<8;i++) { DQ=0; DQ =ku&0x01; delays(3); DQ=1; ku>>=1; } } void match_rom(unsigned char *rom) //DS18B20匹配ROM函数 { unsigned char i; rst(); //初始化 write(0x55); //匹配ROM for(i=8;i>0;i--) { write(*(rom+i-1)); } } unsigned int read(void) //DS18B20读函数，每次读16位 { int i=0; unsigned int u=0; for (i=0;i<16;i++) { DQ=0; u>>=1; DQ=1; if(DQ) u|=0x8000; delays(4); } return (u); } int read0(unsigned char *seria) //读取对应温度值并转换函数 { int temperature ; unsigned int tp; unsigned int lsb; rst(); //初始化 write(0xCC); //跳过RAM write(0x44); //温度转换 rst(); //再次初始化 write(0xCC); match_rom(seria); //匹配ROM函数调用 write(0xBE); //读取存储器指令 tp=read(); //读取温度值 if((tp&0xf800)==0xf800) //判断正负数 { fushu=1 ; tp=~tp+1 ; lsb=(unsigned int)(tp*6.25); dian=lsb%100; //取小数部分 temperature=lsb/100; } else { fushu=0; lsb=(unsigned int)(tp*6.25); dian=lsb%100; temperature=lsb/100; } return(temperature); } /*****************************************************************************************/ void main() { uint i ; LCD_INIT(); EA=0 ; //使用DS18B20禁止任何中断 while(1) { for(i=0;i<2;i++) { Tm=read0(get_serial+i*8); if(i==0) //判断是第几个的数据 { if(fushu==0) //判断是否加负号 sprintf(LCD_LINE_ONE+5," %d", Tm); if(fushu==1) sprintf(LCD_LINE_ONE+5,"-%d", Tm); sprintf(LCD_LINE_ONE+10,".%d",dian); //加入小数部分 Display_LCD_String(0x00,LCD_LINE_ONE); } if(i==1) { if(fushu==0) sprintf(LCD_LINE_TWO+5," %d", Tm); if(fushu==1) sprintf(LCD_LINE_TWO+5,"-%d", Tm); sprintf(LCD_LINE_TWO+10,".%d",dian); Display_LCD_String(0x40,LCD_LINE_TWO); } } } } |
