|
|
本帖最后由 初学者52 于 2019-11-5 16:17 编辑
头文件:#ifndef __DS18B20_H__
#define __DS18B20_H__
#include<reg52.h>
#define uint unsigned int
#define uchar unsigned char
sbit ds=P2^3;
void ds1820init(void);
void ds1820xbyte(uchar dat);
uchar ds1820rbyte(void);
uchar rwendu(void);
#endif
c文件:#include"ds18b20.h" #include"delay.h" void ds1820init(void) void ds1820xbyte(uchar dat){ uchar i; for(i=0;i<8;i++) { ds=0; ds=dat&0x01; ds18b20delay(4); ds=1; dat>>=1; }{ uchar n; ds=1; ds18b20delay(8); ds=0; ds18b20delay(80); ds=1; ds18b20delay(8); n=ds; ds18b20delay(4); }} void ds1820xbyte(uchar dat) { uchar i; for(i=0;i<8;i++) { ds=0; ds=dat&0x01; ds18b20delay(4); ds=1; dat>>=1; } ds18b20delay(4); } uchar ds1820rbyte(void) { uchar i,a; for(i=0;i<8;i++) { ds=0;a>>=1; ds=1; if(ds) a|=0x80; ds18b20delay(4); } return a; } uchar rwendu(void) { uchar b,c; ds1820init(); ds1820xbyte(0xcc);//跳过 rom ds1820xbyte(0x44);//启动温度测量 ds18b20delay(300); ds1820init(); ds1820xbyte(0xcc); ds1820xbyte(0xbe); b=ds1820rbyte(); c=ds1820rbyte(); c<<=4; c+=(b&0xf0)>>4; return c; }
求大佬帮忙看看，哪里出了问题
|
|
[复制链接]
![_HJ[NPPX4A8COIX94]O4[GR.png](http://c.51hei.com/d/forum/201911/03/205853suibckvqcv8cebo9.png "_HJ[NPPX4A8COIX94]O4[GR.png")
