zdc.rar_ZDC

#include<pic1687x.h> #define uchar unsigned char #define uint unsigned int #define DQ RD0 #define ds1820_high TRISD0=1 #define ds1820_low() TRISD0=0,RD0=0 uint receive[4]; void ds18b20_delay(char x,char y) { char z; do{ z=y; do{;}while(--z); }while(--x); } /*ds18b20_in_1() { ds18b20_fang_1=1; } ds18b20_out_low_1() { ds18b20_fang_1=0; ds18b20_data_1=0; }*/ uchar ds18b20_init_1() { uchar i,temp_abse; temp_abse=0; for(i=0;i<20;i++) { ds1820_low(); ds18b20_delay(2,70); ds1820_high; ds18b20_delay(2,8); if(DQ==0) { temp_abse=1; break; } } ds18b20_delay(2,60); return (temp_abse); } void ds18b20_write_1(dat) uchar dat; { uchar i,temp; for(i=8;i>0;i--) { temp=dat&0x01; //最低位移出 ds1820_low(); asm("nop"); asm("nop"); asm("nop"); asm("nop"); asm("nop"); //从高拉至低电平,产生写时间隙 if(temp==1) //如果写1,拉高电平 { ds1820_high; } ds18b20_delay(2,7); //延时63us ds1820_high; asm("nop"); asm("nop"); dat=dat>>1; //右移一位 } } uchar ds18b20_read_1() { uchar i; uchar value=0; //读出温度 static bit j; for(i=8;i>0;i--) { value>>=1; ds1820_low(); asm("nop"); asm("nop"); asm("nop"); asm("nop"); asm("nop"); asm("nop"); //6us ds1820_high; //拉至高电平 asm("nop"); asm("nop"); asm("nop"); asm("nop"); asm("nop"); //4us j=DQ; if(j) value|=0x80; ds18b20_delay(2,7); //63us } return(value); } ds18b20_1() { uchar ds18b20_absel,temper_h,temper_l; float temper; uint aaa; ds1820_high; ds18b20_absel=ds18b20_init_1(); ds18b20_init_1(); if(ds18b20_absel==1) { ds18b20_write_1(0xcc); ds18b20_write_1(0x44); ds18b20_delay(0xff,0xff); ds18b20_absel=ds18b20_init_1(); // ds18b20_init_1(); ds18b20_write_1(0xcc); ds18b20_write_1(0xbe); temper_l=ds18b20_read_1(); temper_h=ds18b20_read_1(); } else { temper_h=0xff; temper_l=0xff; } ds1820_high; temper=(temper_h*256+temper_l)*6.25; aaa=(int)temper; return aaa; } init_serial() { TRISC=0xff; TXSTA=0x24; RCSTA=0x90; SPBRG=0x19; GIE=1; PEIE=1; RCIE=1; } void interrupt ZD() { uchar date; if(RCIF==1&RCIE==1) { date=RCREG; switch(date) { case 0x44: TXREG=receive[0]; break; case 0x55: TXREG=receive[1]; break; case 0x66: TXREG=receive[2]; break; case 0x77: TXREG=receive[3]; break; //case 0x88: TXREG=0X18;break; default:break; } } } main() { uint temp1; init_serial(); while(1) { temp1=ds18b20_1(); receive[0]=temp1/1000; receive[1]=temp1%1000/100; receive[2]=temp1%100/10; receive[3]=temp1%10; } }