18b20温度测量.doc

#include #include #define uchar unsignedchar#define uint unsignedintsbit DQ=P36;sbit BEEP=P37;sbit HI_LED=P14;sbit LO_LED=P15;uchar code DSY_CODE=0x3f,0x06,0x5b,0X4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x00;uchar code df_Table=0,1,1,2,3,3,4,4,5,6,6,7,8,8,9,9;char Alarm_Temp_HL2=70,-20;uchar CurrentT=0;uchar Temp_Value=0x00,0x00;uchar Display_Digit=0,0,0,0;bit HI_Alarm=0,LO_Alarm=0;bit DS18B20_IS_OK=1;uint Time0_Count=0;void delay(uint x) while (-x);uchar Init_DS18B20() uchar status;DQ=1;delay(8);DQ=0;delay(90);DQ=1;delay(8);status=DQ;delay(100);DQ=1;return status; uchar Readonebyte()uchar i,dat=0;DQ=1;_nop_();for(i=0;i=1;DQ=1;_nop_();_nop_();if(DQ) dat|=0x80;delay(30);DQ=1; return dat; void writeonebyte(uchar dat) uchar i;for(i=0;i=1; void Read_Temperature()if(Init_DS18B20()=1)DS18B20_IS_OK=0;elsewriteonebyte(0xcc);writeonebyte(0x44);Init_DS18B20();writeonebyte(0xcc);writeonebyte(0xbe);Temp_Value0=Readonebyte();Temp_Value1=Readonebyte();Alarm_Temp_HL0=Readonebyte();Alarm_Temp_HL1=Readonebyte();DS18B20_IS_OK=1; void Set_Alarm_Temp_Value()Init_DS18B20();writeonebyte(0xcc);writeonebyte(0x4e);writeonebyte(Alarm_Temp_HL0);writeonebyte(Alarm_Temp_HL1);writeonebyte(0x7f);Init_DS18B20();writeonebyte(0xcc);writeonebyte(0x48);void Display_Temperature()uchar i;uchar t=150;uchar ng=0, np=0;char Signed_Current_Temp;if (Temp_Value1&0xf8)=0xf8) Temp_Value1=Temp_Value1; Temp_Value0=Temp_Value0+1;if(Temp_Value0=0x00)Temp_Value1+;ng=1; np=0xfd;Display_Digit0 = df_Table Temp_Value0 & 0x0f ;CurrentT=(Temp_Value0&0xf0)4)|(Temp_Value1&0x07)=Alarm_Temp_HL0?1:0;LO_Alarm=Signed_Current_Temp=Alarm_Temp_HL1?1:0;Display_Digit3=CurrentT/100;Display_Digit2=CurrentT%100/10;Display_Digit1=CurrentT%10;if(Display_Digit3=0)Display_Digit3=10;np=0xfb;if(Display_Digit2 = 0)Display_Digit2=10;np = 0xf7; for(i=0;i30;i+)P0=0x39;P2=0x7f;delay(t);P2=0xff;P0=0x63;P2=0xbf;delay(t);P2=0xff;P0=DSY_CODEDisplay_Digit0;P2=0xdf;delay(t);P2=0xff;P0=(DSY_CODEDisplay_Digit1)|0x80;P2=0xef;delay(t);P2=0xff;P0=DSY_CODEDisplay_Digit2;P2=0xf7;delay(t);P2=0xff;P0=DSY_CODEDisplay_Digit3;P2=0xfb;delay(t);P2=0xff;if(ng) P0=0x40;P2=np;delay(t);P2=0xff; void T0_INT() interrupt 1 TH0=-1000/256; TL0=-1000%256; BEEP=!BEEP;if (+Time0_Count = 400) Time0_Count = 0;if(HI_Alarm) HI_LED=HI_LED;else HI_LED=1;if(LO_Alarm) LO_LED=LO_LED;else LO_LED=1; void main (void)IE=0x82;TMOD=0x01;TH0=-1000/256;TL0=-1000%256;TR0=0;HI_LED=1;LO_LED=1;Set_Alarm_Temp_Value();Read_Temperature();delay(50000);delay(500