谢谢了在线等挺急的
#include <AT89X52.h> #define uint unsigned int#define uchar unsigned char //宏定义#define SET P3_1 //定义调整键#define DEC P3_2 //定义减少键#define ADD P3_3 //定义增加键#define BEEP P3_6 //定义蜂鸣器#define ALAM P1_2 //定义灯光报警#define DQ P3_7 //定义DS18B20总线I/O bit shanshuo_st; //闪烁间隔标志bit beep_st; //蜂鸣器间隔标志sbit DIAN = P0^5; //小数点uchar x=0; //计数器signed char m; //温度值全局变量uchar n; //温度值全局变量uchar set_st=0; //状态标志signed char shangxian=38; //上限报警温度,默认值为38signed char xiaxian=5; //下限报警温度,默认值为38//uchar code LEDData[]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90,0xff};uchar code LEDData[]={0x5F,0x44,0x9D,0xD5,0xC6,0xD3,0xDB,0x47,0xDF,0xD7,0xCF,0xDA,0x9B,0xDC,0x9B,0x8B};//============================================================================================//====================================DS18B20=================================================//============================================================================================/*****延时子程序*****/void Delay_DS18B20(int num){ while(num--) ;}/*****初始化DS18B20*****/void Init_DS18B20(void){ unsigned char x=0; DQ = 1; //DQ复位 Delay_DS18B20(8); //稍做延时 DQ = 0; //单片机将DQ拉低 Delay_DS18B20(80); //精确延时,大于480us DQ = 1; //拉高总线 Delay_DS18B20(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_DS18B20(20);}/*****读一个字节*****/unsigned char ReadOneChar(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_DS18B20(4); } return(dat);}/*****写一个字节*****/void WriteOneChar(unsigned char dat){ unsigned char i=0; for (i=8; i>0; i--) { DQ = 0; DQ = dat&0x01; Delay_DS18B20(5); DQ = 1; dat>>=1; }}/*****读取温度*****/unsigned int ReadTemperature(void){ unsigned char a=0; unsigned char b=0; unsigned int t=0; float tt=0; Init_DS18B20(); WriteOneChar(0xCC); //跳过读序号列号的操作 WriteOneChar(0x44); //启动温度转换 Init_DS18B20(); WriteOneChar(0xCC); //跳过读序号列号的操作 WriteOneChar(0xBE); //读取温度寄存器 a=ReadOneChar(); //读低8位 b=ReadOneChar(); //读高8位 t=b; t<<=8; t=t|a; tt=t*0.0625; t= tt*10+0.5; //放大10倍输出并四舍五入 return(t);}/*****延时子程序*****/void Delay(uint num){ while( --num );}/*****初始化定时器0*****/void InitTimer(void){ TMOD=0x1; TH0=0x3c; TL0=0xb0; //50ms(晶振12M)}/*****读取温度*****/void check_wendu(void){ uint a,b,c; c=ReadTemperature()-5; //获取温度值并减去DS18B20的温漂误差 a=c/100; //计算得到十位数字 b=c/10-a*10; //计算得到个位数字 m=c/10; //计算得到整数位 n=c-a*100-b*10; //计算得到小数位 if(m<0){m=0;n=0;} //设置温度显示上限 if(m>99){m=99;n=9;} //设置温度显示上限 }/*****显示开机初始化等待画面*****/void Disp_init(void) { P0 = ~0x80; //显示---- P2 = 0x7F; Delay(200); P2 = 0xDF; Delay(200); P2 = 0xF7; Delay(200); P2 = 0xFD; Delay(200); P2 = 0xFF; //关闭显示}/*****定时器0中断服务程序*****/void timer0(void) interrupt 1{ TH0=0x3c; TL0=0xb0; x++;}/*****外部中断0服务程序*****/void int0(void) interrupt 0{ EX0=0; //关外部中断0 if(DEC==0&&set_st==1) { do{ Disp_alarm(shangxian); } while(DEC==0); shangxian--; if(shangxian<xiaxian)shangxian=xiaxian; } else if(DEC==0&&set_st==2) { do{ Disp_alarm(xiaxian); } while(DEC==0); xiaxian--; if(xiaxian<0)xiaxian=0; }}/*****外部中断1服务程序*****/void int1(void) interrupt 2{ EX1=0; //关外部中断1 if(ADD==0&&set_st==1) { do{ Disp_alarm(shangxian); } while(ADD==0); shangxian++; if(shangxian>99)shangxian=99; } else if(ADD==0&&set_st==2) { do{ Disp_alarm(xiaxian); } while(ADD==0); xiaxian++; if(xiaxian>shangxian)xiaxian=shangxian; } }
1328512480修改后程序-待测试.zip
QQ传你了。
您的延時函數,這樣是不太準確的
/*****延时子程序*****/ void Delay_DS18B20(int num) { while(num--) ; }
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