ds18b20.h

基于STC89C52和DS18B20的温度采集代码

/*总线上只接一个DS18B20*/
#include <reg52.h>
#include <intrins.h>

#define uchar unsigned char
#define uint unsigned int

int temper;

sbit Bdq18B20=P1^0;

/*
const char code crc_table[256]={0,94,188,226,97,63,221,131,194,156,126,32,163,253,31,65,
                                157,195,33,127,252,162,64,30,95,1,227,189,62,96,130,220,
                                35,125,159,193,66,28,254,160,225,191,93,3,128,222,60,98,
                                190,224,2,92,223,129,99,61,124,34,192,158,29,67,161,255,
                                70,24,250,164,39,121,155,197,132,218,56,102,229,187,89,7,
                                219,133,103,57,186,228,6,88,25,71,165,251,120,38,196,154,
                                101,59,217,135,4,90,184,230,167,249,27,69,198,152,122,36,
                                248,166,68,26,153,199,37,123,58,100,134,216,91,5,231,185,
                                140,210,48,110,237,179,81,15,78,16,242,172,47,113,147,205,
                                17,79,173,243,112,46,204,146,211,141,111,49,178,236,14,80,
                                175,241,19,77,206,144,114,44,109,51,209,143,12,82,176,238,
                                50,108,142,208,83,13,239,177,240,174,76,18,145,207,45,115,
                                202,148,118,40,171,245,23,73,8,86,180,234,105,55,213,139,
                                87,9,235,181,54,104,138,212,149,203,41,119,244,170,72,22,
                                233,183,85,11,136,214,52,106,43,117,151,201,74,20,246,168,
                                116,42,200,150,21,75,169,247,182,232,10,84,215,137,107,53};


*/
uchar temp_buff[2];
uchar *p;


void delay_us(uchar us);
bit init_1820(void);
void write_1820(uchar wr);
uchar read_1820(void);
void read_1820s(uchar jj);
uint get_temp1820(void);