18b20在液晶lcd1602上面显示

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1、18b20在液晶LCD1602上面显示/*-----------------------------------------------名称：51单片机培训专题8---数字温度传感器DS18B20论坛：http://bxmcu.vicp.net:8080//编写：bjw日期：2011/11/03修改：无内容：1：自己编写程序在液晶LCD1602上面显示2：温度可以上下限报警，报警用灯指示3：温度上下限值可以通过按键任意设定。------------------------------------------------*/#include#

2、include#include#defineucharunsignedchar#defineuintunsignedint;sbitKeyPort=P3;//定义按键端口sbitDQ=P3^2;//ds18b20端口sbitled1=P2^0;sbitled2=P2^1;sbitkey1=P1^0;sbitkey2=P1^1;sbitkey3=P1^2;sbitkey4=P1^3;sbitkey5=P1^4;sbitkey6=P1^5;sbitrs=P2^4;//定义端口sbitrw=P2^5;sbiten=P2^6;

3、unsignedintReadTemperature(void);bitInit_DS18B20(void);unsignedcharReadOneChar(void);voidWriteOneChar(unsignedchardat);bitLCD_Check_Busy(void);voidLCD_Write_Com(unsignedcharcom);voidLCD_Write_Data(unsignedcharData);voidLCD_Clear(void);voidLCD_Init(void);voiddelay_us(unsignedchart);

4、voiddelay_ms(unsignedchart);voiddisplay(floattemperature1);voidchuli();bitReadTempFlag;//定义读时间标志voidInit_Timer0(void);//定时器初始化uchartable[]="temperature";ucharbiao;//计算key1的次数ucharTEMPH=30,TEMPL=20;voidmain(void){inttemp;floattemperature;LCD_Init();//初始化液晶delay_ms(20);//延时有助于稳定LCD_C

5、lear();//清屏Init_Timer0();while(1)//主循环{uchari;LCD_Write_Com(0x80+2);for(i=0;i<11;i++)//显示temperature{LCD_Write_Data(table[i]);delay_ms(30);}chuli();//对按键进行处理if(biao==0)//无按键时的读取{if(ReadTempFlag==1){ReadTempFlag=0;temp=ReadTemperature();if(temp&0x8000){temp=~temp;//取反加1temp+=1;tempe

6、rature=(float)temp*0.0625*(-1);display(temperature);}else{temperature=(float)temp*0.0625;if(temperature>=TEMPH)//上限报警{display(temperature);led1=0;}else{display(temperature);led1=1;}if(temperature<=TEMPL)//下限报警{display(temperature);led2=0;}else{display(temperature);led2=1;}}}}}}void

7、chuli(){if(key1==0)//按下第一个键时，进入上限/下限处理{delay_ms(5);if(key1==0){biao++;}while(!key1);}if(biao==1)//按下第一次时，显示TEMPH{LCD_Write_Com(0x80+0x40);LCD_Write_Data(0x54);LCD_Write_Data(0x4d);LCD_Write_Data(0x50);LCD_Write_Data(0x48);if(key2==0)//TEMPH++;{delay_ms(5);if(key2==0){TEMPH++;}while

8、(!key2);}if(key3==0)//TEMP