}
LcdWriteCom(0x80);
#endif 5.temp.c #include\
void Delay1ms(unsigned int y) //延时 { }
unsigned char Ds18b20Init() //初始化 {
unsigned int i; DSPORT=0; i=70; while(i--); DSPORT=1; i=0;
while(DSPORT)
unsigned int x; for(y;y>0;y--)
for(x=110;x>0;x--);
}
{ }
return 1;//成功 i++; if(i>5000)
return 0;//失败
void Ds18b20WriteByte(unsigned char dat) //写字节 {
unsigned int i,j; for(j=0;j<8;j++) {
DSPORT=0;
//每写入一位数据之前先把总线拉
低1us } }
(数据手册上模糊)
i++;
DSPORT=dat&0x01; i=6; while(i--); DSPORT=1; dat>>=1;
unsigned char Ds18b20ReadByte() { }
void Ds18b20ChangTemp() //温度转换 {
Ds18b20Init(); Delay1ms(1); unsigned char byte,bi; unsigned int i,j; for(j=8;j>0;j--) {
DSPORT=0; i++; DSPORT=1; i++; i++;
bi=DSPORT; byte=(byte>>1)|(bi<<7); i=4; while(i--);
}
return byte;
}
Ds18b20WriteByte(0xcc);
Ds18b20WriteByte(0x44);
void Ds18b20ReadTempCom() //读取温度命令 { }
int Ds18b20ReadTemp() //读取温度 {
int temp=0;
unsigned char tmh,tml; Ds18b20ChangTemp();
Ds18b20Init(); Delay1ms(1);
Ds18b20WriteByte(0xcc); Ds18b20WriteByte(0xbe);
Ds18b20ReadTempCom(); tml=Ds18b20ReadByte();
tmh=Ds18b20ReadByte(); temp=tmh; temp<<=8; temp|=tml;
}
return temp;